Harris DX-10 Technical Manual

Am broadcast transmitter

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T.M. No. 888-2247-006

Harris Corporation

TECHNICAL MANUAL

DX-10

AM BROADCAST TRANSMITTER

994 9085 002

888-2247-006

Introduction

Installation

III

Operation

Theory of Operation

Maintenance

Troubleshooting/Emergency Procedures

VII Parts List

Subsections

VIII RF

Oscillator

Buffer Amplifier

RF Amplifier Modules

Driver Combiner/Motherboard

Driver Supply Regulator

RF Multimeter

RF Combiners

Output Sample &

Output Monitor

Audio

Analog Input

Analog to Digital Converter

Modulation Encoder

DC Regulator

External Interface

Control

Controller

LED Board

Switch Board/Meter Panel

Test Equipment

Printed: April 2001

Rev. L: 03/16/2009

Table of Contents

Troubleshooting

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Summary of Contents for Harris DX-10

Page 1 TECHNICAL MANUAL DX-10 AM BROADCAST TRANSMITTER 994 9085 002 888-2247-006 Introduction Installation Operation Theory of Operation Maintenance Troubleshooting/Emergency Procedures VII Parts List Subsections VIII RF Oscillator Buffer Amplifier RF Amplifier Modules Driver Combiner/Motherboard Driver Supply Regulator RF Multimeter RF Combiners Output Sample &...
Page 3 MANUAL REVISION HISTORY DX-10 AM TRANSMITTER 888-2247-xxx REV. # DATE PAGES AFFECTED 05-25-88 34979 Replace and/or add the following pages: Title Page, Manual Revision History Page, D-10, H-15 thru H-19, H-29/H-30, K-25, & K-26. Added page MRH-1/MRH-2 11-3-89 35509 Manual converted into Ventura with multiple changes to correct errata and update parts list and drawings.
Page 4 006-G 11-17-03 49774 Replaced Title Page, MRH-1/MRH-2 and Sections 2, 4 and 5. 006-H 04-21-04 50178 Replaced Title Page, MRH-1/MRH-2 and Section H. 006-J 12-10-04 50683 Replaced Title page, MRH-1/MRH-2, section 5 and A. 006-K 04/13/05 51250 Replaced Title Page, MRH-1/MRH-2, and section J. 006-L 03/16/09 53733...
Page 5 (217/221-7096). Replaceable Parts Service Replacement parts are available 24 hours a day, seven days a week from the HARRIS Service Parts Department. Telephone 217/222-8200 to contact the service parts department or address correspondence to Service Parts Department, HARRIS CORPORATION, Broad- cast Systems Division, P.O.
Page 6 C001 and is not the actual part number for C001. In the ten digit part numbers, if the last three numbers are 000, the item is a part that Harris has purchased and has not manufactured or modified.
Page 9 The installation, operation, maintenance and service of this equipment involves risks both to personnel and equipment, and must be performed only by qualified personnel exercising due care. HARRIS CORPORATION shall not be responsible for injury or damage resulting from improper procedures or from the use of improperly trained or inexperienced personnel performing such tasks.
Page 11 FIRST-AID Personnel engaged in the installation, operation, maintenance or servicing of this equipment are urged to become familiar with first-aid theory and practices. The following information is not intended to be complete first-aid procedures, it is a brief and is only to be used as a reference. It is the duty of all personnel using the equipment to be prepared to give adequate Emergency First Aid and thereby prevent avoidable loss of life.
Page 12: Table Of Contents
Table of Contents Section I Frequency Monitor Connection ....2-11 Introduction/Specifications Remote Control Connections ..... . 2-11 Scope and Purpose .
Page 13 Output Monitor VSWR Fault ..... 3-3 AC Power Circuits in the DX-10....4-15 Interlocks: External, Air or Door Interlock Fault.
Page 14 RF Circuit Descriptions, For RF Circuits Not on Offset Adjustment R7 ..... . . 5-4 Printed Circuit Boards ......4-20 Analog Input Board A35 .
Page 15 In The Output Network ..... . 6-3 Completion of Basic Frequency Change of DX-10 . . . 5-23 Symptom: Transmitter Turns ON but Transmitter Binary Amplifier Phase Alignment .
Page 16 External Interlock ....... 6-7 Failed RF Amplifier......6-13 External Interlock Terminals Open.
Page 17 Possible Cause: Power Supplies....A-5 DX-10 VSWR Protection Circuit Action ....6-3 Possible Cause: Oscillator Sync Circuit.
Page 18 RF Amplifier Module On/Off Control Circuit..C-1 Series Pass Transistors Q5 and Q6 (For Section D1B RF Transformer Primary Current: Amplifier Off ..C-3 Supply Voltage) ....... E-2 Oscillator Sync Signal.
Page 19 DC Supply Voltages ......G-2 “Dither” Signal: Function ......J-4 Maintenance.
Page 20 Voltage Regulators (U2, U16, U18, U19, “INTLK OFF” (“ERROR”) Indication ..L-5 U20, U21, Q1) ......K-4 “INTLK ON”...
Page 21 Shorted Transistor or Diode ....M-5 Symptom: No Monitor Outputs (Analog Signal Out- Shorted “Crowbar” Triac ..... M-6 puts) Operate, or All are Seriously Incorrect .
Page 22 Gate U52A ....... . . P-8 Up-Down Counter Control Gates (U63, U64, U65, “PA Off”...
Page 23 Fault)........P-27 DX-10 Fault Types......Q-4 Type 1 Fault Gate, U58C .
Page 24 Audio Inputs......Q-27 DX-10 Transmitter Action When VSWRs are De- Analog Divider......Q-27 tected .
Page 25: Section I
Section D, Driver Combiner/Motherboard (A14) This technical manual contains the information necessary to Section E, Driver Supply Regulator (A22) install and maintain the DX-10 AM TRANSMITTER. The vari- Section F, RF Multimeter (A23) ous sections of this technical manual provide the following types Section G, RF Combiners: Binary Combiner/Motherboard of information.
Page 26 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 27: Installation
CARRIER and HARRIS CORPORATION. This section of the technical manual provides detailed installa- tion procedures and initial turn on instructions for the DX-10 AM Returns and Exchanges 2.2.1 TRANSMITTER. Information in this section includes the fol-...
Page 28: Ac Power
(see Figure 2-4, a top view of the the transmitter. transmitter). Location of the terminal board for the AC Power input connection (TB5) is shown in Figure 2-3, DX-10 Rear AC Power 2.3.3 View. Remote Control terminal boards TB1 and TB2 are shown Ratings for fuses or circuit breakers for various input voltage in Figure 2-6.
Page 29: Transmitter Grounding & Rf Output Connections
Aluminum, assorted thicknesses, for leveling transmit- points E14 and E15. ter. The RF Output connector in the DX-10 is a 1-5/8 inch EIA flanged Hand Operated Hole Punch connector. A female connector is provided on the transmitter, and For adding 0.25" hardware holes to 0.020" thick copper a bullet is provided to allow mating with either a male or a female ground strap at transmitter ground connection.
Page 30: Equipment Placement
Figure 2-3 for location of the ground connection points. work coils. If any damage appears to have been caused during NOTE shipment, notify both the shipper and Harris (refer to the para- It is important that a ground strap be installed from the transmit- graph “Unpacking”).
Page 31: Power Requirements
Power Requirements 2.6.1 WARNING The DX-10 is designed to be operated from a 3 phase, 197 to 281 ENSURE THAT ALL AC POWER IS OFF PRIOR TO START- Vac, 3 wire closed delta connected 48 to 63 Hz power source, ING THE FOLLOWING INSTALLATION PROCEDURE.
Page 32 Table 2-4 Line Voltage Taps for Delta Service Nominal Line Wire Numbers, to T1 Taps: Wire Numbers, to T2 Taps AC to Blower Motor Voltage AC Input 4,5,6 Jumpers 36 to T2 Tap: 37 to T2 Tap: 60Hz 12,13,106 50Hz 12,13,106 to T1 Taps: 208,209,210 to T1 Taps:...
Page 33: Wire Wye Ac Power Wiring
b. This completes AC power wiring. Skip the paragraphs on indicated in the second part of table 2-5. Replace the “Wye” connections and go to the paragraph “Power Wir- junction box cover. ing Check.” Other “FOUR WIRE WYE” Connections 2.6.10 4 Wire WYE AC Power Wiring 2.6.8 a.
Page 34 Table 2-5 Line Voltage Taps for Wye Service Nominal Line Wire Numbers, to T1 Taps: Wire Numbers, to T2 Taps AC to Blower Motor Voltage AC Input 4,5,6 Jumpers 36 to T2 Tap: 37 to T2 Tap: 60Hz 12,13,106 50Hz 12,13,106 to T1 Taps: 208,209,210 to T1 Taps:...
Page 35: Controller Battery Backup
Audio Source Impedance 2.7.3 The following paragraphs include information on customer in- The DX-10 Transmitter uses a Bessel filter at the audio input, to terface connections for audio input, RF output, external inter- obtain superior overshoot performance. Performance of this...
Page 36: Dummy Antenna Information
nector is used, the bullet supplied with the transmitter, but output. The PA TURN OFF connection, described below, should be used for that purpose. packed separately, will be required. More than one “external interlock” can be used by connecting Dummy Antenna Information 2.7.5 the normally closed interlock switches in series.
Page 37: Frequency Monitor Connection
The modulation monitor sample output, at A27J5, is adjustable from 0 to 10 volts rms (rf output, at carrier frequency). This level The Customer Interface of the DX-10 for remote control, meter- is first adjusted at LOW power by moving a tap on inductor...
Page 38: Remote "Status" Indications
2.8.1.3 Remote “STATUS” Indications input (TB1-33 and TB1-35) is paralleled with the OFF button on Status outputs at TB1 and TB2 are open-collector transistor the transmitter. outputs, to ground. When the corresponding status indicator is PA Turn OFF 2.9.3 illuminated at the transmitter (or when a status panel LED is The PA TURN OFF function is NOT the same as the “OFF”...
Page 39: Use Of Off, Pa Turn Off, And External Interlock Functions
2.9.6 RF Drive estimate, Remote Meter Reading 2.9.10 The DX-10 does not have a separate “ON” switch. The transmit- (at TB1-9) ter comes ON at the desired power level (Low, Medium or High) This is an UNCALIBRATED sample of the RF drive to the RF when a momentary remote control input (at least 100 millisec- Power Amplifier, and corresponds to the “Relative RF Drive”...
Page 40: Pre-Turn On Checks; Electrical
ING STEPS, STOP THE PROCEDURE, REMOVE ALL POWER, AND 16. TB1-21,23 PA OFF REFER TO TROUBLESHOOTING SECTION OF DX-10 MAINTE- The “PA OFF” control input is normally connected to the NANCE TECHNICAL MANUAL. Phasor or Antenna Switching control unit for antenna pattern The initial turn on sequence provides checks or adjustments for switching.
Page 41: Low Voltage Power Supplies Check
a. Normal Low Voltage supplies operating. the RF multimeter inside the compartment, on the com- partment’s right side wall. b. Correct fan rotation. h. Switch to each of the following three parameters and check c. Correct Driver operation. them against the factory test data: d.
Page 42: Rf Driver Operation Check
2. Reinstall the power supply compartment back door, mum DETECTOR NULL (ANTENNA) reading on the front then turn the wall disconnect switch ON to reapply AC panel multimeter. primary power to the transmitter again. CAUTION 3. Re-check the fan’s direction of rotation. DO NOT ADJUST “TUNING”...
Page 43: Tuning And Verifying Correct Operation At High Power
RF multimeter inside the non-interlocked compartment, a. Set the LOW power output of the transmitter to the lowest and compare them with the factory test data. power that will be required for normal operation or to 1 kW, whichever is lowest. 2.12.4.2 Tuning and Verifying Correct Operation at High b.
Page 44: Controller;Battery Backup
Audio Gain Adjustment 2.12.8 nite backup). The Audio Input sensitivity of the DX-10 transmitter can be adjusted with the AUDIO GAIN ADJ control on the Analog 2.12.6.1 Installing Batteries Input board, so that audio input levels of -10 dBm to +10 dBm Check battery polarity on the holder, and simply insert 3 AA size at 600 ohms will produce 100% modulation.
Page 45: Final Matching Into Antenna
This is not a transmitter check, rather, it is a system check. The c. Turn the transmitter OFF. DX-10 is capable of positive peak modulation of +125% or greater at 11 kW carrier power, and even higher positive peak WARNING modulation at 10 kW or less.
Page 46 3. If positive peaks are GREATER than 100%, your audio input phasing is correct. 2-20 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 47 Table 2-7 Transmitter Meter Reading Log at Initial Turn-On FREQUENCY DATE 10KW 10KW 10KW AUDIO MODULATING FREQUENCY MODULATION % CARRIER POWER PA CURRENT FRONT PANEL MULTIMETER -22V +22V RELATIVE RF DRIVE DET. NULL (ANTENNA) DET. NULL (FILTER) PA SUPPLY +VDC RF MULTIMETER PREDRIVER IDC PREDRIVER +VDC...
Page 48 Blower Motor Sample Coil Grounding (under cover) Fuses F7, F8, F9 L107 Terminal C101 C102 Grounding Blower Block HV Transformer T1 Primary Connections Figure 2-3 DX-10, Installation Information, Rear View 2-22 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 49 RF Output Connector 1-5/8" EIA flange Wire Entrance 2 inch round C101 Adjustment openings Access Hole Figure 2-4 DX-10, Installation Information, Top View 03/16/2009 888-2247-006 2-23 WARNING: Disconnect primary power prior to servicing.
Page 50 2 inch round wiring entance openings RF Multimeter A23M1 2 inch round wiring entance openings Low Voltage Power Supply Switch S11 Figure 2-5 DX-10, Installation Information, Front View with Doors Open 2-24 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 51 A23M1 RF Multimeter Selector Switches Frequency Monitor Output J5 Optional External Oscillator Input Oscillator Board Figure 2-6 DX-10, Installation and Checkout Information, View Showing Right Side of Front Non-interlocked Compartment 03/16/2009 888-2247-006 2-25 WARNING: Disconnect primary power prior to servicing.
Page 52 Shunt, J1, J2, J3 Analog Input Board A35 Controller Board A38 Optional Back-Up Batteries "PA OFF" Switch S5 Figure 2-7 DX-10, Installation and Checkout Information, View Showing Left Side of Front Non-interlocked Compartment 2-26 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 53: Operation
Check the status indicator panel. This panel uses bicolor LED indicators, which may be either red or green. If primary power This section of the DX-10 Technical Manual contains informa- is applied and the transmitter is ready for operation, all the status, tion on transmitter operation for the maintenance engineer or interlock, and overload LED’s will be green.
Page 54: Transmitter Turn-Off Procedure
you should also hear three “clicks” as contactors operate, then problems, but in reality are normal transmitter actions for certain the blower should start, then power will come up.) If FOR- possible fault conditions. Also included are a list of basic faults WARD POWER is not correct, verify that you have selected the that could occur and references to other portions of the manual correct power level (LOW, MEDIUM or HIGH).
Page 55: Transmitter Shuts Off
RF Amp “Envelope OK” Fault (Remote “En- b. If supply voltage is not present, and the transmitter has 3.7.8 been off for a period of time, try waiting for approximately velope Error” Fault) one minute. If the transmitter now comes on normally, Fault indicator is Red or flashing Red, or a remote RF Amp continue normal operation.
Page 56: Overloads
LOW, MEDIUM, or HIGH push-button. If the transmitter turns the fault indicators, and try turning the transmitter on. If on then immediately shuts off and the AIR interlock indicator is the fault occurs again, try operating at LOW power. If the illuminated, Do Not attempt to operate the transmitter further.
Page 57: Vswr Fault Indication Stays On
The tun- ing and loading controls should be near the center of their A VSWR overload will cause the power output of the DX-10 to range when this step is completed. If minimum reflected go to zero for about 15 milliseconds.
Page 58 Table 3-1 DX-10 Transmitter, Controls and Indicators REF. CONTROL/INDICATOR FUNCTION Loading Control “Tee Matcher” control for matching load to 50 ohm transmitter im- pedance. Tuning Control “Tee Matcher” control for matching load to 50 ohm transmitter im- pedance. Switch Board/Meter Panel See Table 3-2 and Figure 3-2.
Page 59 Figure 3-1 DX-10 Front View, Controls and Indicators 03/16/2009 888-2247-006 WARNING: Disconnect primary power prior to servicing.
Page 60 Table 3-2 Switch Board/Meter Panel, Controls and Indicators REF. CONTROL/INDICATOR FUNCTION VOLTAGE multimeter Indicates voltages at points selected by the Multimeter Switch (Ref. 11). SUPPLY CURRENT meter Indicates total high voltage supply current being supplied to the Power Amplifier and RF Driver module. POWER meter Indicates either FORWARD or REFLECTED power at the transmit- ter output, whichever is selected by the POWER METER selector...
Page 61 Figure 3-2 Switch Board/Meter Panel, Controls and Indicators 03/16/2009 888-2247-006 WARNING: Disconnect primary power prior to servicing.
Page 62 Table 3-3 Status Panel, Controls and Indicators CONTROL/INDICATOR FUNCTION LOCAL/REMOTE, switch Selects LOCAL or REMOTE control of the transmitter. (Remote monitoring is operational in either the LOCAL or REMOTE switch position.) LOCAL, status indicator Red LED indicates that the remote control inputs to the transmitter are disabled, and only local control is possible.
Page 63 Table 3-3. Continued Status Panel, Controls and Indicators CONTROL/INDICATOR FUNCTION VSWR SENSOR, Used to test operation of VSWR logic, re- MANUAL TEST, sult of test is displayed on VSWR SEN- push-button SOR, STATUS indicator (Ref. 14, above). When the push-button is depressed, both the Bandpass Filter and Antenna VSWR status indicators will momentarily go red, then Sensor Status Indicator will indicate...
Page 64 Table 3-3. Continued Status Panel, Controls and Indicators EXT. INTERLOCKS, Bicolor LED indicator. Indicates status of external interlocks. status indicator GREEN indicates a completed circuit; RED indicates an open circuit. MODULATION ENCODER, Bicolor LED indicator. Indicates status of cables between the MODU- CABLE INTERLOCK, LATION ENCODER board and the Combiner/Motherboards.
Page 65 19 18 19 18 Figure 3-3 Status Panel, Controls and Indicators 03/16/2009 888-2247-006 3-13 WARNING: Disconnect primary power prior to servicing.
Page 66 Table 3-4 DX-10 Controls and Indicators, Inside Non-interlocked Compartment and Interlocked Power Supply Compartment CONTROL/INDICATOR FUNCTION Predriver A, B, Indicates open Predriver supply line fuses, for Predriver Section A Fuse Indicators, and Section B. (Fuses and indicator LEDs are located on Buffer Am- A16DS1, DS2.
Page 67 Figure 3-4 DX-10 Controls and Indicators, Inside Non-interlocked Compartment and Interlocked Power Supply Compartment 03/16/2009 888-2247-006 3-15 WARNING: Disconnect primary power prior to servicing.
Page 68 Table 3-5 DX-10 Controls and Indicators, Left Side of Non-interlocked Compartment and on inside of Front Door REF. CONTROL/INDICATOR FUNCTION Modulation Encoder LED’s on Modulation Encoder board A36, indicate Cable Interlock Indicator LED’s: status and “PA Off” logic output status.
Page 69 Figure 3-5 DX-10 Controls and Indicators, Left Side of Non-interlocked Compartment and on inside of Front Door 03/16/2009 888-2247-006 3-17 WARNING: Disconnect primary power prior to servicing.
Page 70 Table 3-6 DX-10 Controls and Indicators, Right side of Non-interlocked Compartment REF. CONTROL/INDICATOR FUNCTION NOTE These potentiometer adjustments are accessible through holes in the compartment wall, and require a tuning tool with a guard ring around the blade to keep the tool from slipping off the adjusting screw.
Page 71 Figure 3-6 DX-10 Controls and Indicators, Right side of Non-interlocked Compartment 03/16/2009 888-2247-006 3-19 WARNING: Disconnect primary power prior to servicing.
Page 72 3-20 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 73: System Operation
Interlock switches and power supply grounding have been pro- Location of Door Interlocks and Grounding 4.2.2 vided on the DX-10 because of the low impedance, high current Switches capabilities of the high voltage power supply, which can provide The front access door on the power supply compartment and the over 75 amperes continuous DC at +230 volts.
Page 74: Door Interlock Switches
Most of the blocks on the block diagram represent printed circuit power is applied (whenever the wall switch is ON), even if the boards in the DX-10 Transmitter, and if you look at the DX-10 transmitter is turned OFF. These terminals are all protected by Overall Schematic Diagrams, you will find many of the same covers and protective plastic shields.
Page 75 Figure 4-1 DX-10 Block Diagram 03/16/2009 888-2247-006 WARNING: Disconnect primary power prior to servicing.
Page 76 Figure 4-2 Turn-on/Turn-off control logic. 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 77 Figure 4-3 Control section block diagram. 03/16/2009 888-2247-006 WARNING: Disconnect primary power prior to servicing.
Page 78 Figure 4-4 RF Flow block diagram. 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 79 Figure 4-5 Audio and Modulation block diagram. 03/16/2009 888-2247-006 WARNING: Disconnect primary power prior to servicing.
Page 80: Oscillator
AM Stereo operation. Additional Filter also smooths the small steps that remain in the power inputs and outputs are provided if the DX-10 is part of a 20 amplifier output. kilowatt combined transmitter installation (the external oscilla- The output network is factory-tuned to match a resistive 50 ohm tor input will not be used in a combined transmitter).
Page 81: Controller Section ("Controller" And "Led" Boards)
Transmitter Power Supplies 4.3.4 Conversion will include some terms, abbreviations, and con- The DX-10 Transmitter contains two unregulated power sup- cepts used in this Technical Manual which may not be familiar plies, a Low Voltage supply and a High Voltage supply, both to some Broadcast Station engineers and technicians.
Page 82: Quantized Amplitude Modulation
“L” and “H,” particularly on sche- matic diagrams. In most of the digital logic circuits in the DX-10, c. BINARY: Has only two possible values. A Binary normal TTL (transistor-transistor logic) levels are used, and a Number is a number represented using only the digits 0 “logic LOW”...
Page 83: Amplitude Modulation - A Review
1 kW through 11 1/32 step, and 1/64 step. As the 42 “BIG STEP” amplifiers are kW. (DX-10 power output can be adjusted to less than 1 kilowatt, turned on and off, the transmitter RF output changes in equal but with increased distortion and noise).
Page 84: Analog To Digital Conversion
In the DX-10 the analog audio signal is converted into a digitized ning of each time interval. Note that the analog signal amplitude audio signal by an Analog to Digital Converter.
Page 85: Digital To Analog Conversion
D/A converter is an approximation of the original For this reason, the carrier power output of the DX-10 is rated at analog input voltage. The maximum roundoff or quantization up to 11 kW.
Page 86: Big Steps" And Binary Steps
(MSB’s) control (2 -1) = 63 steps, but only from +7.26 through +7.50 volts 11101 42 steps are used in the DX-10, so the total number of steps is less than (2 -1) = 4095 steps. from +7.51 through +7.75 volts...
Page 87: Rf Combiner
DX-10 to produce the amplitude modulated output signal. ing, induces a voltage in its segment of the copper rod, and Overall efficiency of the DX-10 is very high, because the digital because the straight rod passes through all toroids, the voltages modulator uses very little power and the RF amplifiers are also in the segments of the rod add together.
Page 88: Overvoltage And Undervoltage Protection
4.11 regulators, and zener diodes, provide required voltages for cir- There are two power supplies in the DX-10, a Low Voltage cuits on the boards. The +30V output operates the Buffer Am- power supply and a High Voltage power supply. Both power plifier and some Binary Step RF amplifier modules and also supplies are located in the transmitter’s power supply compart-...
Page 89: Power Distribution Board, A39
REMOVE ALL AC POWER FROM THE TRANSMITTER BEFORE REMOVING THE PROTECTIVE CAGE IN THE POWER SUPPLY Refer to Sheet 2 of the DX-10 Overall Schematic for the follow- COMPARTMENT. PRIMARY POWER CONNECTIONS ARE EX- ing description.
Page 90: Supply Filtering
The Supply Current Meter is shown in the lower left corner of capacitors to discharge through the Power Supply Discharge Sheet 1 of the DX-10 overall schematic diagram. The negative board, and through mechanical shorting switches if the inter- side of the supply goes to ground through a 250 ampere current locked doors are opened.
Page 91: Fuse Board, A24
Switch Resistors R16, R17, and R18 form a voltage divider. A voltage The DX-10 transmitter has redundant cooling sensors. The first follower (gain = 1) on Controller Board A38 provides outputs to cooling sensor is a pressure actuated Air Switch, S7, which is...
Page 92: Interlocks And Interlock Relays
Interlocks and interlock relays turn the transmitter OFF if either windings. A copper rod going vertically through the toroids is a interlocked door is opened. Interlocked doors on the DX-10 are secondary winding. The combiner output goes to the PA RF the front door of the power supply compartment, and the RF Drive Splitter, A15.
Page 93: Rf Drive Splitter, A15
T8 is a PA combiner current sample for the The plug-in RF amplifier modules include 42 “Big Step” mod- Bandpass Filter VSWR phase detector on Output Monitor board ules and six “Binary Step” modules. Sheet 2 of the DX-10 A28. Overall Schematic Diagram identifies step numbers and module numbers.
Page 94: Rf Output Combiner Description
Its output is the total RF output of the erboard schematic diagram and as a “Combiner Current transmitter. The combiner’s output impedance is low, about 4 Sample” on sheet 1 of the DX-10 Overall Schematic ohms, so that at 10 kilowatts the current is about 50 amperes. Diagram.
Page 95: Output Sample/Output Monitor
TEE Matcher: “Tune” and “Load” Controls 4.19.10 ing should be at or near zero, and the REFLECTED DX-10 Output Network tuning is fixed, and requires a 50 ohm POWER should read zero. resistive load for optimum operation. The Tee Matcher provides Refer to 817-1280-101, DX-10 Bandpass Network Setup chart convenient tuning to match loads within a 1.5:1 VSWR circle at...
Page 96 4-24 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 97: Maintenance/Alignments
Section V Maintenance/Alignments Introduction Inspection is the most important preventive maintenance opera- tion because it determines the necessity for the others. Become This section provides general system preventive maintenance thoroughly acquainted with normal operating conditions in order information, board replacement and alignment procedures and a to readily recognize and identify abnormal conditions.
Page 98: Fixed Resistors
Replacing Boards and Components on Boards 5.3.1 TURER MAY NOT FULFILL THE REQUIREMENT FOR EXACT When replacing some boards in the DX-10, preset switch set- REPLACEMENT. tings or jumper plug positions and some boards require adjust- a. When a fuse blows, determine the cause before installing ments that must be preset or adjustments and/or measurements a replacement.
Page 99: Boards Which Require Preset Switch Settings Or
a. SWITCH BOARD/METER PANEL A31 * Once the regulator voltages have been measured, ensure that the PA turn off switch S5 is in the PA-ON position (down). The b. EXTERNAL INTERFACE A28 * transmitter high voltage can now be turned on and it will now be c.
Page 100: Driver Combiner/Motherboard A14
Adjustments get an idea if a replacement module is operating efficiently by The remaining boards in the DX-10 have adjustments which operating the transmitter at full power and normal modulation must be checked and possibly preset before applying high volt- for 5 minutes then shut the transmitter down.
Page 101: Analog Input Board A35
ments are necessary to the Offset control. If the modulation 3VDC. See Figure 5-13. Adjust The Offset control A35R84 such tracking is not acceptable the Offset control R7 can be adjusted that the positive peak of this wave form just begins to clip, then to allow the transmitter to modulate equally at all power levels.
Page 102: Carrier Frequency Adjust A17C1 And A17C3
Locate S1, a four section DIP switch, and set each section to the capacitance, try to use the least amount of capacitance (S1-1,2 same setting as the board to be replaced. Locate L4 and using a and 3) to achieve phase alignment of the two signals. If too much non-inductive tuning tool set the slug in the coil for approxi- capacitance is used there may not be enough signal input to mately the same amount of penetration into the coil.
Page 103: Modulated B- Level A30R38, And Clip Ad
on these controls once the new board has been preset and f. While depressing momentary button switch S5, set the installed is as follows. Normal/Calibrate switch S8 to the Calibrate position. Note that the signal at TP5 has dropped in amplitude. 5.6.5.1 Modulated B- Level A30R38, and Clip Adjust g.
Page 104: Ment
e. Set the Normal/Calibrate switch S8 to the Normal position, c. Adjust R24 until the voltage matches the Factory Test Data and release momentary pushbutton switch S5. Make sure sheet. that the vertical sensitivity of both channels of the scope If the Factory Test Data sheet is unavailable or if it is necessary is the same.
Page 105: Forward/Reflected Power Adjustments C6
5.6.6.5 Forward/Reflected Power Adjustments C6 and C40 to measure the same voltage. The transmitter is now ready for a. With the transmitter operating at 10 kW (15 kW on the application of high voltage. DX15) and no modulation, read the Reflected power indi- Overload Adjustment Procedures 5.6.8 cation on the front panel meter.
Page 106: Average Pa Current Overload Set A32R102
5.6.8.2 Average PA Current Overload Set A32R102 NOTE When measuring RF Amplifier drive amplitudes or phasing, the Operate the transmitter at 10 kW output power. Modulate it with amplifier to be measured must be turned on to give a correct a 20Hz square wave to 100% modulation.
Page 107: Board Replacement Instructions
these two jumpers. At all operating powers note that the power #6 and one #8 screws that are located on the Combiner cover at output is now 10 to 20% lower than normal and that the Envelope the Driver Combiner/Motherboard. Lastly remove wire #151 Error LED is now illuminated RED.
Page 108: Binary Combiner/Motherboard Removal And Re
Binary Combiner/Motherboard Removal and 5.7.4 screws that mount the Motherboard to the side rails. The whole Replacement A18 assembly can now be removed from the transmitter. The Binary Combiner/Motherboard is replaced in the same Replacement of the Driver Combiner/Mother- 5.7.6 manner as the Main Combiner/Motherboards.
Page 109: Blower Motor B1 Replacement
The following is a step by step procedure on changing the Remove both the rear panels on the RF Compartment (center), frequency of the DX-10 Transmitter. If a complete frequency and the Output Network compartment (left). From the RF com- change is desired this procedure can be followed in order.
Page 110: Installation Of Frequency Determined Components
Setting of Frequency Determined Jumpers and 5.9.3 Switches Many of the frequency determined components on the DX-10 Probing the third are permanently installed and are simply changed by moving the Harmonic trap desired jumper, coil tap or switch position. The Frequency...
Page 111 Disconnect L101 from C101. Connect the impedance meter probe to C103. Use the L102 tap that connects to C103 for this adjustment. Adjust it to bring the impedance near resonance. This will be at least 1000 ohms. It is desirable to have the Probing the Tank Circuit impedance at a phase angle of about -50 degrees.
Page 112: Rf Circuits Checkout
C101 adjustment, however be sure to return C101 to it’s earlier setting. If you find that the network was not already tuned to the peak, then a small adjustment of L101 should be made. This will maintain the desired bandpass characteristics and at the same time present the PA modules with the desired tuning.
Page 113: Rf Driver Adjustments
adjust the Predriver Level control R1 (near L1) for a scope Depress the LOW power on button and note that the high voltage reading of 23Vp-p drive signal or as high as it will go. Note that comes up as indicated on the front panel multimeter but no RF if the transmitter is at the high end of the band R1 may not be in power or PA current is indicated.
Page 114: Initial Tuning At Low Power (1 Kw)
SECT.1A voltage is below 40VDC, this indicates that the Driver indicated. Connect the Probe on the RF Multimeter to TP7 on outputs must be decreased. Note the settings of the jumpers the Analog input board A35. Operate the multimeter select to the J17-J22 on the Driver Combiner/Motherboard.
Page 115: Detector Null (Bandpass Filter) Adjust
g. Adjust capacitor C29 for minimum signal at TP5. This f. Set the time base on the scope to display 2 to 3 cycles of signal will contain mostly harmonics of the carrier fre- quency. It may be necessary to add additional capacitance g.
Page 116: Forward/Reflected Power Adjustments C6
1-2 to position 1-3. b. Press LOW power, and adjust the RF output for 600W on DX-10 or 900W on DX-15. e. Turn the transmitter back on at full power. Note that the Reflected meter position now indicates forward power and c.
Page 117: A To D Phasing Check
since this is a wave form at a negative voltage. The positive peak appears to be running excessively warm. Only check modules of this wave form should be from -2.2 to -2.3VDC. The negative Steps 1-20 at this time. If any module is running hot, the Drive peak should occur between -3.0 and -4.5VDC.
Page 118: Bandpass Filter Response
Output Monitor A27 Final Adjustments and loaded to produce 9.07 kW of carrier power. If Steps 1-20 5.9.12 are turned on then the transmitter will not be able to produce 5.9.12.1 Antenna and Bandpass Filter Final Adjustments sufficient positive peak modulation for 11 kW. If only Steps 1-15 Now with the transmitter operating at 10 kW forward power, are required for 10 kW carrier then all the modules are loaded note that both the Antenna Null and Bandpass Filter Null posi-...
Page 119: Completion Of Basic Frequency Change Of Dx-10
This completes all the basic requirements in changing the fre- right hand MOSFET when viewing the module from the front. quency of the DX-10. At this time the transmitter adjustments Operate the transmitter again at 5 kW. If no wave form appears, critical to reliability and basic performance have been addressed.
Page 120: Neutralization Adjustment
Whenever any jumper changes are made to the Neutralization WARNING circuit, the drive level on the neutralization amplifier should be ENSURE ALL VOLTAGE HAS BEEN REMOVED FROM TRANS- checked to ensure that it is between 20 and 30Vp-p. If it is not MITTER AND GROUNDING STICK IS USED TO GROUND ALL in this range do not apply high voltage to the transmitter or POINTS WHERE AC OR RF POWER HAS BEEN APPLIED BE-...
Page 121: Other Adjustments
The Bandpass tuning is the only other control that will have any cating when an RF Amplifier fails. See paragraph on the LED noticeable effect on the IPM of the DX-10. Normally the Band- board replacement. pass tuning is adjusted for Peak RF output out of the transmitter as indicated on the power meter.
Page 122 Figure 5-8 Predriver Input drive wave form, measured at the Anode of CR7 or CR8 on Predriver Module.(5 Vp-p per division) Figure 5-9 Driver Transformer tap setting diagram A14T7, T10 and T11. 5-26 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 123 Figure 5-10 RF Drive wave form at RF Amplifier, gate of Q3 (Anode of CR7). RF Amplifier turned “OFF”. (5 Vp-p per division) Figure 5-11 RF Drive wave form at RF Amplifier, Gate of Q3 (Anode of CR7). RF Amplifier turned “ON”. (5 Vp-p per division) 03/16/2009 888-2247-006 5-27...
Page 124 Figure 5-12 Antenna VSWR Detector voltage and current samples as measured at Output Monitor A27TP1 and TP2. Also typical of Bandpass filter samples. 5-28 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 125 Figure 5-13 Modulated B- wave form at DC Regulator A30TP7. 1kw operation with 100 Hz 100% modulation. 1 V per division, 0.0 VDC at top line. Figure 5-14 Modulated B- wave form at DC Regulator A30TP7. 10kw operation with 100 Hz, 100% modulation.
Page 126 Figure 5-15 Oscillator sync samples at Oscillator A17TP4 and TP5. Transmitter operating at 10kw with no modulation. The two samples are not in phase. (1V per division) Figure 5-16 Oscillator sync samples at Oscillator A17TP4 and TP5. Transmitter operating at 10kw with no modulation.
Page 127 Figure 5-17 Demodulated audio. Transmitter operating at 1kw with 100 Hz, approximately 10% triangle modulation. Top trace-demodulated audio. Bottom trace-Modulation Encoder wave form of Step 6. Good Binary alignment shown. Figure 5-18 Demodulated audio. Transmitter operating at 1kw with 100Hz, approximately 10% triangle modulation. Top trace-Demodulated audio.
Page 128 5-32 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 129: Troubleshooting
Green, this indicates a problem specifically with knowledge of the DX-10 Transmitter obtained by careful study the contactor turn on logic, contactor drive circuits, or the of the Theory of Operation.
Page 130: Symptom: Transmitter Will Not Turn On-One Or
will be heard when the transmitter LOW, MEDIUM, or HIGH being given to the transmitter. Check the following items which button is depressed. This is the step start contactor energizing will generate a PA Turn-Off command. and de-energizing. 6.2.5.2 PA Turn-Off Switch Set to the PA OFF Position Symptom: Transmitter Will Not Turn ON- 6.2.3 The PA Turn-Off switch is located on the Controller board.
Page 131: Antenna Vswr Caused By An Impedance Change In The Transmitter Load
6.4.1 occurred in the output network and should be attended to as soon The DX-10 Overcurrent fault monitors the actual supply current as possible. Until the transmitter can be repaired: of the high voltage supply and will generate a type 1 fault any 1.
Page 132: Faults With Tone Modulation
Table 6-1 Fault Types I. TYPE 1 — TURN TRANSMITTER OFF. a. a. External Interlock. b. b. Door Interlock. c. c. Air Supply Fault (Air Flow Switch). d. d. High Voltage Supply Failure (High Voltage Supply Protection Circuit). e. e. High Voltage Supply Overvoltage. f.
Page 133: Supply Current Overloads On Turn On
6.4.1.3 Supply Current Overloads on Turn On voltage power supply transformer to the next highest primary Normally if the transmitter indicates a Overcurrent overload on number. If the transformer is presently tapped to 240/0, change turn on, the first most likely cause is the transmitter has low the tapping to 240/+11 to reduce the supply voltage.
Page 134: Low Frequency, High Level Modulation
How high it deflects Operate the RF Multimeter select on the DX-10 to the DRIVER depends on the original operating voltage recorded in the test +VDC (0-3) X100 position. Depress the LOW power on button data sheet.
Page 135: Severe Driver Mistuning
6.6.0.1 Driver Supply Regulator Failure PLIED BEFORE PERFORMING THE FOLLOWING STEPS. The DX-10 uses the Gain Controlling regulator for the driver If the doors appear to be closing properly then remove all power supply so the only time an Overdrive fault would occur is if a and ohmmeter each half of each switch for continuity when the fault occurred in the regulator itself.
Page 136: External Interlock Relay K4
6.7.3.2 Top Air Exhaust Restricted ground. Check F6 for an open and replace if failed. Make sure If ductwork is installed to the top of the transmitter for exhausting that there are no shorts on the External interlock line. F6 is the air, and a restriction is present in the exhaust, it is possible to located by the contactor K2 under the metal cover in the Power generate an Air Interlock.
Page 137: Rf Amp Envelope Error Fault
distortion must be looked at to determine if an RF Amp is still WARNING at fault but the LED is not illuminated. See paragraph on “Higher ENSURE ALL VOLTAGE HAS BEEN REMOVED FROM TRANS- Than Normal Audio Distortion.” If no RF Amps are at fault and MITTER AND GROUNDING STICK IS USED TO GROUND ALL the Envelope Error LED is RED, then the detector circuit may POINTS WHERE AC OR RF POWER HAS BEEN APPLIED BE-...
Page 138: A To D Converter Conversion Error Fault
VSWR overloads may indicate a problem that should be located ribbon connectors. Check each of these connectors for proper and corrected. The VSWR protection built into the DX-10 trans- seating. mitter is both for the protection of transmitter high power cir- 6.8.8.3 Isolating a Cable Interlock Problem...
Page 139: Two Stage Vswr Action
In the DX-10, this zero power output is accom- Combination of both Stages of the VSWR Cir- 6.8.15...
Page 140: Antenna Vswr Fault
Antenna VSWR Fault 6.8.16 This output power drop would be around 10%. A failure of a higher step is not noticed as a drop in power at 1 kW for instance. 6.8.16.1 Antenna VSWR Caused By An Impedance Change The audio distortion will also be slightly higher but may not be In The Transmitter Load noticeable with only one RF Amp failed.
Page 141: Audio Processor Equipment Defective Or In
6.9.3.2 Audio Processor Equipment Defective or Incorrectly a big step failure at around Big Step 40. The modulation Encoder waveform is also shown for that step. Many problems with positive peaks are due to defective or The failed module should be replaced to obtain full positive peak incorrectly setup processing equipment.
Page 142 Figure 6-1 Upper trace-Demodulated audio at 100 Hz, 100% modulation at 10kw, showing missing step due to failed RF amplifier. Lower trace-Modulation Encoder signal for missing step 20. Figure 6-2 Upper trace-Demodulated audio for transmitter operating at 10kw, 125%+peak, triangle modulation. Showing missing step 39. Lower trace-Modulation Encoder signal for missing step 39.
Page 143: Transmitter Mistuning
Connect a scope if the distortion is visible on the audio waveform, or a distortion analyzer to J2 The DX-10 will tune into a wide range of loads and still produce on the A to D board A34. Remove the BNC connector connected very good audio performance.
Page 144: Defective Output Toroid
6.10.3 short time before failure. During this condition the MOS- Normally the DX-10 transmitter does not exhibit any type of FET devices on the module will operate Hotter than the excessive carrier shift due to a specific problem such as power other modules.
Page 145: Transmitter Mistuning
Possible Causes of poor Efficiency 6.10.4.1 Transmitter Mistuning The DX-10 will tune into a wide range of loads and still operate very efficient. It could be possible for the transmitter load to be not optimized and therefore the transmitter will not be optimized into its load.
Page 146: Using Flexpatch™ For Isolating Modulation En
with that step from the plug. Locate P6-3/4, the gold jumper for In conclusion, by using the Modulation Encoder schematic and step 42. Step 42 is selected because it is only on during the with careful thought it is possible to troubleshoot the circuitry highest positive peaks.
Page 147 Figure 6-4 RF drive waveform as seen at RF amplifier, Gate of Q3 (anode of CR7). RF amplifier turned OFF (5V p-p per division). Figure 6-5 RF drive waveform as seen at RF amplifier, Gate of Q3 (anode of CR7). RF amplifier turned ON (5V p-p per division).
Page 148: Measuring Steps 18-42
Therefore holding the raise button will only turn on up to step time problems are suspected to be caused by improper RF drive 18. To turn on any higher steps these must be manually turned phasing. Remember that there are two sections of each RF on using the Flex Patch feature discussed shortly.
Page 149: Excessive Drive Phase Difference
6.11.5.4 Measuring Binary RF Amp Drive Phasing J5 on the oscillator board and make sure the scope sync is set to Because the binary amps switch on at different rates, it is not External. Adjust the horizontal vernier on the scope so that one always possible to have all the binaries on at one time.
Page 150: Excessive Drive Phase Difference
waveform Switch the scope to the X10 position and readjust the phasing should be checked. The only other cause of drain phas- horizontal position so that the RF transition again crosses the ing problems on a module would be the MOSFET’s themselves. center line of the scope.
Page 151 Figure 6-6 RF drive waveform as seen at RF amplifier, Gate of Q3 (anode of CR7). RF amplifier turned ON. Showing zero crossing of reference phase and the measured phase approximately 1 degree lagging. 1 v p-p per division, X10 MAG. Figure 6-7 RF drain waveform as seen at RF amplifier drain of Q3, RF amplifier turned ON.
Page 152 6-24 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 153: Section Via
RF The DX-10 transmitter has a number of safety and protective amplifier section. Also see Troubleshooting, Section VI of devices and circuits, both for the protection of operating person- the manual, for more information.
Page 154: Predriver Amplifier Failure
Predriver Amplifier Failure station technical and engineering staff in determining when The Predriver stage of the DX-10 consists of an RF Amplifier VSWR overloads may indicate a problem that should be located module identical and completely interchangeable with any of the and corrected.
Page 155 If only the BANDPASS FILTER VSWR status indicator stays tinue until the reflected power is below the VSWR overload red, and the DX-10 has reduced its output power, but the Re- circuit limit setting. flected Power meter indication is low, a change in the transmitter output network or the VSWR phase detector is indicated.
Page 156 Static charge buildup can occur under Changes in component values in the DX-10 directional coupler conditions of rain, snow, or even blowing dust or sand. or phase detector circuits is also possible, but not likely. These types of circuits have been very stable and reliable. Checking or b.
Page 157 DX-10, and is not installed on the printed circuit board. Positions THIS WILL PREVENT INADVERTENT TURN-ON AND POSSIBLE 43 through 48 on P6 are also not used on the DX-10. FAILURE OF THE RF AMP SHOULD THE FlexPatch™ JUMPER The “RF amplifier turn on” signals to the power amplifier INADVERTENTLY TOUCH ANOTHER COMPONENT ON THE MODULATION ENCODER BOARD.
Page 158 6A-6 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 159 Replaceable Parts List Index Table 7-1. XMTR, DX-10 10KW SS MW ....994 9085 001 Table 7-2. RF MODULE ......992 6967 001 Table 7-3.
Page 160 Table 7-1. XMTR, DX-10 10KW SS MW - 994 9085 001 (X) Harris PN Description QTY UM Reference Designators 0411310013A *RUBBER SPONGE 3/8 22.0 FT 300 1977 000 SCR, 3/8-24 X 1/2 306 0011 000 NUT, STOP 6-32 312 0053 000...
Page 161 #C102 943 5479 115 STRAP, -013 CAPACITOR #C102 988 2247 001 DP DX-10 MAINTENANCE 989 0042 001 PKG CHECK LIST, DX-10 992 6967 001 RF MODULE 1.0 EA SPARE 992 9733 001 MOD KIT FOR 480V CONVERSION 994 9085 002 XMTR, BASIC, DX-10 10KW 1.0 EA...
Page 162 839 8118 602 SCH, OVERALL, 3PH, DX10, WYE 0.0 EA 917 2494 001 JUMPERS, MOD KIT 1.0 EA Table 7-4. XMTR, BASIC, DX-10 10KW - 994 9085 002 (DH) Harris PN Description QTY UM Reference Designators 007 4060 060 BRZ, FGR STK OC97-438-04 1.0 FT...
Page 163 632 1082 000 WATTMETER, 20KW, 4.5",[W] M003 632 1133 000 AMMETER, 0-3ADC, 4.5",[W] M001 638 0020 000 SHUNT, 100A 50MV +/-1% SH001 646 0665 000 INSPECTION LABEL 646 1483 000 HARRIS NAMEPLATE 12/09/04 888-2247-006 WARNING: Disconnect primary power prior to servicing.
Page 164 646 1492 000 NAMEPLATE PATENT DX-10 646 1662 009 NAMEPLATE, DX10 650 0028 000 KNOB RD SKIRT 1.135" DIA 650 0135 000 KNOB RD 1.772" OD SKIRT #L103,#L104 813 5007 022 STDOFF 6-32X1/4 1/4 DIA #T002TBSHLD 813 5007 026 STDOFF 6-32X1/2 1/4 DIA 14.0...
Page 165 829 9009 223 SHAFT 829 9009 228 LOWER RF COND 829 9009 229 GROUND STRAP 829 9009 230 TUBE, E102 TO E103 829 9009 233 STRAP, C104 TO L105 829 9009 234 TUBE, E102 TO L103 829 9009 235 CROSSOVER BAR BLOCK 829 9009 236 CROSSOVER BAR 829 9009 237...
Page 166 929 9009 180 REAR SHLD 1.0 EA 929 9009 182 REAR SHLD 1.0 EA 929 9009 212 DOOR MOUNTING ANGLE 1.0 EA 929 9009 218 SWITCH, HOT ANGLE 1.0 EA 929 9009 220 SWITCH, GROUND ANGLE 1.0 EA 939 6208 115 COVER, CIRCUIT BREAKER 1.0 EA #CB001...
Page 167 POWER SUPPLY DISCHARGE 1.0 EA 992 9298 001 OUTPUT MONITOR 1.0 EA A027 Table 7-5. THERMAL INTERLOCK - 917 2165 001 Harris PN Description QTY UM Reference Designators (A) 252 0004 000 WIRE, STRD 18AWG YELLOW 0 FT 296 0260 000...
Page 168 XU001 XU002 XU003 XU004 XU005 XU006 XU007 XU008 XU009 XU010 XU011 XU012 XU013 XU014 XU015 XU016 XU017 XU018 XU019 XU020 XU021 XU022 XU023 XU024 XU062 404 0674 000 SOCKET, DIP, 14 PIN (DL) 11.0 EA XU051 XU052 XU053 XU055 XU056 XU057 XU059 XU060 XU061 XU063 XU064 404 0767 000 SOCKET, DIP, 20 PIN (DL)
Page 169 FIRMWARE, MODULATION ENCODER 1.0 EA 943 4038 030 PWB ASSY, MOD ENCODER 1.0 EA Table 7-7. PWA, FUSE ESD SAFE - 992 6675 001 Harris PN Description QTY UM Reference Designators (J) 384 0341 000 RECTIFIER 1N5404 ESD 8.0 EA...
Page 170 382 0359 000 IC, 7815 ESD 1.0 EA U002 382 0360 000 IC, 7915 ESD 1.0 EA U018 382 0472 000 IC, LM318 ESD 5.0 EA U009 U024 U026 U027 U028 382 0605 000 IC 7905C 1.0 EA U021 382 0648 000 IC, LM339A ESD 1.0 EA U020...
Page 171 C001 C002 C003 C005 C006 C009 C010 C012 C013 C015 C016 C017 C018 C019 C020 C021 C027 C028 C030 C031 C032 C035 C036 C037 C038 C039 C043 C045 C046 C054 C056 C059 C061 C062 C070 C077 C079 C080 C081 C082 C094 C104 C108 C109 516 0530 000 CAP .01UF 10% 100V X7R...
Page 172 XFMR 1.0 EA T001 999 2760 001 HARDWARE LIST, ANALOG TO 1.0 EA Table 7-9. PWA, MULTIMETER/PROBE,ESD SAFE - 992 6752 005 Harris PN Description QTY UM Reference Designators (B) 384 0431 000 RECT. 1N4001 ESD 2.0 EA CR004 CR005...
Page 173 384 0731 000 * DIODE, SWITCHING 1N4607 ESD 3.0 EA CR002 CR003 CR010 384 0762 000 TRIAC 2N6343A/2N6347A ESD 4.0 EA Q002 Q003 Q004 Q006 384 0782 000 RECT, MR754 400V 6A ESD 2.0 EA CR004 CR008 386 0427 000 ZENER LM-313H 1.22VDC ESD 1.0 EA CR007...
Page 174 Table 7-11. *PWA, DX SWITCH, - 992 6784 002 Harris PN Description QTY UM Reference Designators (H) 358 1928 000 JUMPER 1/4 LG 1/8H 1.0 EA JP001 358 3545 003 STANDOFF, PEM 3/8" H SNAP-TOP 4.0 EA 380 0189 000 XSTR, NPN 2N3904 ESD 4.0 EA...
Page 175 839 6208 301 SCH, SWITCH/METER 0.0 EA 843 4038 201 PWB, SWITCH/METER 1.0 EA Table 7-12. PWA, OUTPUT SAMPLE - 992 6786 001 Harris PN Description QTY UM Reference Designators (M) 500 0841 000 CAP, 750PF 300V 5% 2.0 EA...
Page 176 843 4038 079 PWB, EXTERNAL INTERFACE 1.0 EA 999 2455 001 HARDWARE LIST 1.0 EA Table 7-14. LED BOARD - 992 6828 001 Harris PN Description QTY UM Reference Designators (AR) 358 2177 000 SPACER, LED MOUNT .380 LG 2.0 EA...
Page 177 U005 U013 U014 U021 U023 U029 U033 U034 U046 U047 U054 U067 382 0774 000 IC 74HC14 5.0 EA U012 U022 U041 U045 U065 382 0777 000 IC, 74HC30 ESD 1.0 EA U066 382 0778 000 IC, 74HC32 ESD 3.0 EA U024 U039 U070 382 0781 000 IC, 74HC74...
Page 178 526 0050 000 CAP 1UF 35V 20% 6.0 EA C060 C061 C062 C064 C065 C119 526 0108 000 CAP 4.7UF 35V 20% 2.0 EA C035 C067 526 0125 000 CAP 68UF 6V 20% 1.0 EA C022 526 0314 000 CAP 33UF 10V 20% 1.0 EA C023 526 0321 000...
Page 179 XFMR 1.0 EA T001 929 9009 257 XFMR 2.0 EA L001 L002 Table 7-15. CONTROLLER - 992 6881 001 Harris PN Description QTY UM Reference Designators (AP) 335 0262 000 DF137A INSULATING WASHER 3.0 EA #Q006 #Q008 #Q010 354 0309 000 TERM SOLDER 8.0 EA...
Page 180 382 0791 000 IC, 74HC138 ESD 1.0 EA U040 382 0807 000 IC, 74HC175 ESD 1.0 EA U042 382 0808 000 IC, 74HC192 9.0 EA U007 U008 U009 U019 U020 U021 U031 U032 U033 382 0853 000 IC, 74HC4050 ESD 3.0 EA U047 U048 U069 382 0974 000...
Page 181 522 0554 000 CAP 4.7UF 50V 20% 6.0 EA C075 C079 C082 C085 C088 C091 526 0048 000 CAP 10UF 20V 20% 9.0 EA C081 C087 C103 C105 C109 C126 C127 C131 C132 526 0050 000 CAP 1UF 35V 20% 2.0 EA C108 C130 526 0108 000...
Page 182 839 6208 100 SCHEM, CONTROLLER 0.0 EA 843 4038 086 PWB, CONTROLLER 1.0 EA Table 7-16. PWA, PWR DISTRIBUTION,ESD SAFE - 992 6916 002 Harris PN Description QTY UM Reference Designators (B) 522 0528 000 CAP 470UF 63V 20% 1.0 EA...
Page 183 PWB, BUFFER AMP 1.0 EA 929 9009 198 XFMR 1.0 EA T001 Table 7-19. COMB/MOTHERBD DRIVER, ESD SAFE - 992 6970 001 Harris PN Description QTY UM Reference Designators (X) 000 0000 003 FREQUENCY DETERMINED PART 0.0 EA C012 C013 C014...
Page 184 T001 T002 T003 T004 T005 T006 T007 T008 T009 T010 T011 999 2556 001 HARDWARE LIST 1.0 EA Table 7-20. COMB/MOTHERBD BINARY, ESD SAFE - 992 6971 001 Harris PN Description QTY UM Reference Designators (V) 324 0281 000 NUT, CAPTIVE 4-40 4.0 EA...
Page 185 T1/T16 T2/T15 T3/T14 T4/T13 T5/T12 T6/T11 T7/T10 T8/T9 999 2514 001 HARDWARE LIST, COMB/MOTHERBD 1.0 EA Table 7-22. PWB, DRIVER SUPPLY REG - 992 6973 001 Harris PN Description QTY UM Reference Designators (W) 328 0071 000 WASHER, STEEL COMPRESSION 5.0 EA...
Page 186 XFMR 1.0 EA T001 999 2480 001 HARDWARE LIST 1.0 EA Table 7-23. OSCILLATOR - 992 8069 002 Harris PN Description QTY UM Reference Designators (H) 354 0309 000 TERM SOLDER 11.0 EA E001 E002 E003 E004 TP001 TP002 TP003...
Page 187 843 5155 032 PWB, OSCILLATOR 1.0 EA 999 2450 002 HARDWARE LIST 1.0 EA Table 7-24. ANALOG INPUT BOARD - 992 8077 002 Harris PN Description QTY UM Reference Designators (F) 335 0262 000 DF137A INSULATING WASHER 2.0 EA #Q005 #Q006...
Page 188 382 0757 000 IC OP-27 1.0 EA U011 382 0774 000 IC 74HC14 1.0 EA U013 382 1048 000 IC, UC3834N 2.0 EA U001 U002 382 1065 000 IC 74HCT273 2.0 EA U017 U018 384 0205 000 DIODE SILICON 1N914/4148 ESD 2.0 EA CR009 CR010 384 0321 000...
Page 189 540 1600 211 RES 270 OHM 3W 5% 2.0 EA R055 R063 548 2051 000 RES ZERO OHM 3.0 EA R064 R067 R085 548 2400 101 RES 10 OHM 1/2W 1% 1.0 EA R034 548 2400 201 RES 100 OHM 1/2W 1% 4.0 EA R029 R050 R051 R056 548 2400 205...
Page 190 Table 7-25. POWER SUPPLY DISCHARGE - 992 8684 004 Harris PN Description QTY UM Reference Designators (J) 328 0071 000 WASHER, STEEL COMPRESSION 2.0 EA 380 0681 000 XSTR IRFP350 ESD 2.0 EA Q001 Q004 386 0085 000 ZENER, 1N4740A 10V ESD 2.0 EA...
Page 191 492 0749 000 COIL ADJ RF .76-1.25 UH 1.0 EA L005 492 0750 000 COIL ADJ RF 1.65-2.75 UH 1.0 EA L006 494 0198 000 CHOKE RF 10MH 2.0 EA L001 L004 494 0404 000 CHOKE RF 33.0UH 2.0 EA L002 L010 500 0759 000 CAP, MICA, 100PF 500V 5%...
Page 192 939 6208 260 SHIELD 1.0 EA #A027 999 2496 001 HARDWARE LIST 1.0 EA Table 7-27. XMTR, DX-10 10KW SS MW - 994 9085 003 Harris PN Description QTY UM Reference Designators (C) 492 0745 000 COIL AIR-WOUND 17UH 0.0 EA 492 0746 000 COIL AIR-WOUND 6.75UH...
Page 193 839 6208 256 QUAD CAP CONTACT PLT 0.0 EA 843 4038 087 CABINET OUTLINE, DX-10 0.0 EA 989 0042 001 PKG CHECK LIST, DX-10 0.0 EA 992 6967 001 RF MODULE 1.0 EA SPARE 994 9085 002 XMTR, BASIC, DX-10 10KW 1.0 EA...
Page 194 500 0756 000 CAP, MICA, 330PF 500V 5% C040 500 0761 000 CAP, MICA, 150PF 500V 5% C007 500 0812 000 CAP, MICA, 30PF 500V 5% C002,C004 500 0837 000 CAP, MICA, 510PF 500V 5% C005 500 0838 000 CAP, MICA, 560PF 300V 5% C041 500 0841 000 CAP, 750PF 300V 5%...
Page 195 558 0041 000 OVEN, XTAL HC6/U 19VDC #Y001,#Y002 559 0053 000 THERMISTOR,NTC,10K@25C,1% RT001 560 0121 003 POSISTOR 0.2 AMP 60VDC DISC R075 604 0852 000 SW, RKR DIP 4-SPST S001 610 0679 000 PLUG, SHORTING, .25" CTRS P001,P002,P004,P005,P006,P007,P008 610 0877 000 HDR, STR, 2 PIN, SQ JP4,JP5,JP6 610 0900 000...
Page 196 7-38 888-2247-006 12/09/04 WARNING: Disconnect primary power prior to servicing.
Page 197 Section A Oscillator (A17) Introduction This section includes a description and troubleshooting infor- Duty Cycle Adjust -004 assembly only A.3.5 mation of the -002 and -004 Oscillator boards. The two descrip- In combined type systems this circuit is used to help NULL out tions are included in this chapter, check the board number you harmonics in the output spectrum.
Page 198 Frequency Divider A.4.4 signal is converted to TTL level by Q4 and fed to CMOS analog switch U4-11. Integrated circuits U1 and U2 are dual J-K flip-flops, used as frequency dividers. Each IC section is connected as a divide-by- During normal operation, the Oscillator signal is routed through two circuit.
Page 199 Figure A-1 Oscillator -004 assemly, Simplified Block Diagram Each crystal is contained in a sleeve type oven, which maintains either 50 ohms or approximately 20k ohms, depending on the temperature at 70°C (+/-3°C, approximately). Oven jumper plug position of jumper plug P5. The high impedance input is for use P6 supplies -15Vdc to either oven.
Page 200 DUTY CYCLE A.5.6 wave (8-9v p-p). The output impedance of U3A is very low, and resistor R31 sets the 50-ohm output impedance of the Oscillator The output of U8 drives the duty cycle adjustment circuit. In board. Resistor, R31, is one half of a voltage divider with the combined type systems this circuit is used to help NULL out other half being R16 (to ground) on the input of the Buffer harmonics in the output spectrum.
Page 201 CMOS switch U4 A.7.1.2.1 Output Monitor board. (When VSWR faults are detected, logic Observe the dc voltage at U4-6 while depressing S4 on the LED high pulses will appear at J7-5.) Board. The voltage should change from LOW to HIGH. Measure the RF Output A.6.4 •...
Page 202 U5 faulty A.7.1.3.5 of these dc voltages are missing, check and/or replace the di- The output of U5-7 should be 4-4.5 Vp-p square wave, and can ode(s). Loss of one or both dc voltages will cause a RED be checked at P3-3. “OSCILLATOR”...
Page 203 f. If the positive going edges of the two waveforms are lined Refer to Table A-2 for Jumper configuration. up, no further adjustments are required. A.9.1.1 Additional Installation Steps for HD Radio ONLY g. If the trace on channel 2 is not aligned in phase, adjust L4 Refer to Fig.1 in Application Note following parts list for HD to bring them into phase with each other.
Page 204 Q1 Base Q2 Collector -004 assembly -004 assembly P2-1 Upper Trace CH2 TP5 -004 assembly Lower Trace CH1 TP4 -004 assembly 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 205 J4-8 J5-1 -004 assembly -004 assembly J3-1 -004 assembly 03/16/2009 888-2247-006 WARNING: Disconnect primary power prior to servicing.
Page 206 A-10 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 207 Section B Buffer Amplifier (A16) Output Coupling Network Introduction B.2.5 The output of the Q3-Q4 amplifier stage is coupled to the This section includes a description of the Buffer Amplifier, and Predriver input through broad-band coupling network C3, R8- troubleshooting information. The Buffer Amplifier plugs into R11 and L2.
Page 208 Back-to-back zener diodes CR3 and CR4 should indicate a low into P4-8 and 9; this indicates that the coaxial cable and connec- leakage current in either direction; if one of the diodes is shorted, tors are good. they will look like a single diode with an ohmmeter check or Symptom: Buffer Amplifier LED on Color- B.3.2 “diode test”...
Page 209 Section C RF Amplifier Introduction when the upper pair is on (saturated) the lower pair is off (cut off). When the upper pair is off the lower pair is on. The output This section includes a description of the RF amplifier module, is switched between ground (about zero Volts) and the positive and troubleshooting information.
Page 210 Figure C-1 RF Amplifier Module, simplified diagram. Figure C-2 RF Amplifier operation, half quad configuration. Figure C-3 RF Amplifier operation, full quad configuration. 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 211 Figure C-4 RF Amplifier Module control section operation. A TTL “LOW” control signal from the Modulation Encoder will diodes in the MOSFETs provide an RF current path, as described switch PNP transistor Q5 ON and switch NPN transistor Q7 in the next paragraphs. OFF.
Page 212 Figure C-5 RF Amplifier Module: Combiner Transformer primary winding current flow with module OFF. for “BINARY” PA Modules; +115 Vdc Driver Modules; and Each RF drive transformer has two pairs of secondary windings, +60 Vdc for the Predriver Module. which provide two pairs of drive signals, 180° out of phase, for the upper and lower MOSFET pairs in each half-quad.
Page 213 • When the amplifier is turned OFF, transistor Q7 conducts and Remove the heatsinks one at a time starting with the outer most sink. Break seals on transistor pads as each pair is the RF drive signal is clamped at ground through CR7 and CR8. exposed.
Page 214 C.4.1.2 Checking RF Module Operation 2. Is the amplifier receiving a proper ON/OFF control The most common method of troubleshooting an RF amplifier signal from the Modulation Encoder? after a failure is to put the repaired amplifier in a known working 3.
Page 215 The Buffer Amplifier supply voltage is +30 volts, from the plug into printed circuit board edge connector sockets on this DX-10’s Low Voltage DC supply (which is shown on the DX-10 motherboard. Overall Schematic). The +30 volts goes through resistors A14R27, R28 and R29, and then to the buffer amplifier.
Page 216 Figure D-1 Simplified Diagram, Driver Combiner Motherboard. 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 217 The feed-forward neutralization transformer T9 and current proper RF drive level to the power amplifier section. The “closed sample transformer T8 are part of the DX-10’s PA Output loop adjust” circuit provides an automatic drive level adjust- Combiner. The section of the copper rod BELOW the ground...
Page 218 IPM or IQM. Switch A14S1 D.4.1 Neutralization in the DX-10, when used, is FEED-FORWARD This switch selects either section A or section B on the pre- neutralization. An out-of-phase signal is added to the RF output, driver, and is used if failure of one section occurs.
Page 219 Section E Driver Supply Regulator (A22) +15 Volt Regulator Introduction E.4.1 A 3-terminal integrated circuit voltage regulator, U1, provides This section includes a description of the Driver Supply Regu- the +15 Volt supply for U2. lator, and troubleshooting information. The Driver Supply Regulator assembly includes a printed circuit Control +VDC Reference E.4.2 board and a heat sink.
Page 220 voltage will increase the drain current and decrease the effective becomes more positive, voltage across R25 increases, Q3-Q4 source-to-drain “resistance.” An input voltage of less than +10 conduct more, and the section D1A output voltage increases. Volts will effectively “saturate” the MOSFETs in this circuit and Capacitor C9 and R23-C10 provide a low impedance path result in minimum source-to-drain resistance.
Page 221 Figure E-1 Driver Supply Regulator simplified schematic diagram. Resistor R42 provides negative feedback around the regulator Troubleshooting The Driver Supply section. Regulator Metering Circuits Troubleshooting the Driver Supply Regulator can be done by E.4.8 first checking for proper operation of the regulator, then, if the RF Driver voltages and currents are metered on the RF MUL- fault is determined to be in the regulator assembly, removing the TIMETER.
Page 222 input or defective U1e. Check for +22 Vdc on the front panel b. Shorted Q2. Check Q2, using the out-of-circuit MOSFET multimeter; check connector to J2 on the Driver Supply Regula- Ohmmeter check in Section 5, Maintenance (The Ohmme- tor. To check U1 operation, you can remove the Driver Supply ter check used for bipolar transistors will NOT check Regulator assembly and check on the bench with an input of +22 MOSFETs).
Page 223 Section F RF Multimeter (A23) Introduction For Predriver voltage measurements, series multiplier resistors are located on the Driver Combiner/Motherboard, A14. For This section describes the RF Multimeter board. Driver voltages, voltmeter multiplier resistors are located on the The RF Multimeter provides metering of the Predriver and Driver Supply Regulator, A22.
Page 224 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 225 Combiner Output Steps Principles of Operation G.2.2 In the RF combiners in the DX-10, it is not necessary to have all Refer to the Main Combiner/Motherboard schematic diagram modules delivering the same power. At any instant in time, some 839-6208-229 and Binary Combiner/Motherboard schematic of the modules will be “OFF”...
Page 226 Main Combiner/Motherboards (A19, A20) G.2.3 with P30, P31, P32, and P33. Tap positions are shown in the Frequency Determined Components chart. Each Main Combiner/Motherboard contains combiner trans- former toroids (T1 through T16 on each board) and a printed G.2.4.2 DC Supply Voltages circuit board socket for 16 RF amplifier modules.
Page 227 g. Failed electrolytic capacitors, used in the RC filtering in Controls and Indicators supply voltage lines on each board. The combiner/motherboards have no controls. The only adjust- ments available are coil tap positions. The inductors are labeled on the boards, so this section will not include a “Controls and Indicators”...
Page 228 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 229 Section H Output Sample Board (A26) and Output Monitor (A27) Introduction detected, the PA modules are immediately turned off and the “Oscillator Sync” circuit is activated. This will protect the PA This section includes circuit descriptions and troubleshooting module transistors during a VSWR shut-down. The VSWR logic information for the Output Sample Board and Output Monitor.
Page 230 are used for coarse tuning, and a variable capacitor is used for The voltage sample input at J1-9 is fed to amplitude adjustment fine tuning. The normal/cal switch is provided to resonate the C16 and parallel capacitors C20 and C28 selected by S2. transformer primary circuit.
Page 231 comparator output will go LOW. Diodes CR11 and CR13 protect the “Bandpass VSWR trip” C49 and R50 at U6-7 provide a 19 U1 from transient voltages. millisecond pulse width. R-C Network H.2.2.5.2 Switch S5 prevents U6 from generating a pulse during phase A VSWR condition may last for only a few microseconds.
Page 232 H.2.2.12 +5 VDC And -5 VDC Regulators lation monitor at LOW power is adjusted by the tap on L7. When DC supply inputs to the Output Monitor are +8 VDC and -8 the transmitter is in the MEDIUM or HIGH power position, the VDC, from the low voltage power supply.
Page 233 J.2.2 signal with a dc component, which goes to the Digital to Analog The audio input signal connection to the DX-10 is made at TB3 on the External Interface board (A28). Back-to-back zener di- converter board. The dc component determines the transmitter’s odes on the external interface board provide protection against unmodulated (or “carrier”) power output, and the audio compo-...
Page 234 U12B. input to the buffer amplifier can be observed at TP1. When the DX-10 is modulated 100% with a sine wave, the audio signal The high voltage supply sample from fuse board A24 enters the amplitude at TP1 will be about 1.5 volts peak-to-peak with no Analog Input board at J5-8.
Page 235 0.999), D1 through D12 would be “1001 1001 1001.” A further fault occurs. With no voltage at U10’s “X1" input, the output description of BCD coding used in the DX-10 is included, for would increase toward the -15 volt supply and the transmitter’s reference, after the paragraphs on “Troubleshooting”...
Page 236 +6 and -6 volts at the same frequency. “Dither” Signal: Function J.2.13 The “Dither” signal optimizes noise performance in the DX-10. Resistors R39-R40 and zener diodes CR11-CR12 set the oscil- Transmitter noise performance is good even without the “dither” lator’s output level, the peak voltages at U3 pin 6. R39 and R40...
Page 237 “steps” because is too small to observe with an oscilloscope; the probe will also of this uncertainty. When the DX-10 switches between “Big pick up enough noise to mask the dither signal.
Page 238 CMOS devices requiring special handling on this printed circuit conditions. Two turns CW (clockwise) from minimum is a board include the Digitally Controlled Potentiometer (U8), typical adjustment position. Latches U17 and U18, and gates U13 and U15. Proper adjustment of Dither level can also be confirmed by measuring noise with an audio noise meter (audio analyzer) at Adjustments J.3.3...
Page 239 The Binary Coded Decimal input to the Digitally Controlled Prior to starting a troubleshooting procedure check all switches, Attenuator in the DX-10 consists of three decimal digits, from power cord connections, connecting cables, and power fuses. 03/16/2009 888-2247-006 WARNING: Disconnect primary power prior to servicing.
Page 240 ...
Page 241 Section K Analog To Digital Converter (A34) Introduction PA modules must be switched on and off when the RF drive crosses through zero. During modulation this timing requirement This section describes the Analog to Digital Converter board shifts slightly especially at the low end of the transmitter’s description, maintenance and troubleshooting.
Page 242 Error Detecting Circuits The analog signal level at the board’s input is high so that any K.3.5 noise pickup on interconnecting cables does not degrade the There are circuits on the A/D board that determines if the clock signal-to-noise ratio. Inverting amplifier U28 has a gain of 0.5 signal is being received and if the A/D converter is working to provide the proper single level to the A/D chip input and also properly.
Page 243 K.3.7.2 Amplifier Stage (U24, U25, U26) re-trigger and the output will remain 1. If the pulses stop or the The output of the A/D converter is amplified by U24 and U25. frequency is too low the one-shot output will go low. The gain of the amplifier stage is slightly over 5.
Page 244 Section A of S2 is between pins 1 and 4. Section B of S2 is frequency input is present at J3-1. A loose connector is the most between pins 2 and 3. Section A and B are open for DX-10, likely cause of no sample frequency input because no RF drive DX-15, &...
Page 245 the divider divides by 1 or 2). If the frequency at TP6 is wrong, EOC-L signal at U13-4 will stay LOW. This would indicate a P10 is in the wrong position or U29 is faulty. fault in A/D converter IC U2. Troubleshooting the Frequency Divider K.5.2.3.1 K.5.2.5 POWER UP RESET-L FAULT...
Page 246 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 247 The digital audio inputs then go to inputs of Data The six most significant bits can provide up to 63 steps. In the Latches U49 and U50. DX-10, however, only 42 “Big Steps” are used. An example may help: L.3.3.1 “Binary Step” Digital Audio Circuits (U31, U60-...
Page 248 R117 to improve the pulse rise and fall times at turning the transmitter off. U3A input. The total output of the DX-10 at any instant depends on HOW L.3.5.2 Inverter/Driver Output MANY PA modules are turned on. The relative location of those Refer to the schematic diagram, or to the Simplified In- modules along the combiner pipe has no effect on output.
Page 249 Figure L-1 Inverter/Driver output circuit simplified diagram. ing these “glitches” by proper adjustment of modulated B- will outputs go to zero, turning off all PA modules; therefore, the minimize spurious signal outputs from the transmitter. DATA CLEAR signal is also called a PA TURN-OFF signal. Adjustment of Modulated B- is frequency dependent, and is The PA Turn Off (or Data Clear) input is at J17 pin 28.
Page 250 almost one “Big Step” (it drops by 63/64 of a “Big Step”), then tion on the Status Panel and at DS2 on the Modulation Encoder begins increasing as the “Binary Steps” turn on again. board, when: The result, then, is that if the audio input signal is large enough a.
Page 251 Figure L-2 Modulation Encoder board, Cable Interlock circuit simplified schematic. On the modulation encoder board, LED indicators DS1 (red) and c. “PA Turn-Off” signal, from fault and overload circuits on DS2 (green) provide a RED indication if an interlock fault LED Board A32.
Page 252 Figure L-3 Modulation Encoder board, PA Turn-OFF logic simplified diagram. Figure L-4 Parallel Open-Collector outputs as an “OR” function (If U59A OR U59D). 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 253 NOT the side from the latch joint) or a damaged connector. It may be faster, if a logic probe outputs. When ALL PA modules are in use in the DX-10, the is available, to trace back through “Cable Fault” NOR gates U63 proper jumper plug position is P6 pin 5 for Module 43.
Page 254 the inverter driving it will be HIGH, and you can then refer to Binary and Main Combiner/Motherboard Schematics as re- the Modulation Encoder Schematic, Overall Schematic, and quired to find the cause of the open interlock chain. 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 255 The UC3834 inte- supply. grated circuit voltage regulators used on the DC Regulator board are also used on other boards in the DX-10; this section describes OTHER SUPPLIES USING THE UC3834 M.2.3 all positive and negative voltage regulator circuits using this This IC is also used in on-board regulated supplies on other integrated circuit.
Page 256 The IC’s current sensing feature is not used put at pin 16. The most likely cause of an overvoltage condition in any supply in the DX-10, and the Current Sense input termi- at the supply output is a shorted pass transistor. The Crowbar nals (IC pins 6 and 7) are simply shorted together.
Page 257 IC. Different outputs by controlling PA module turn-on/turn-off times. Turn- supplies in the DX-10 use different values of resistance at this on/turn-off times depend on loading on each module, which in point, determined during design of each supply.
Page 258 M.2.9.1 -(Audio + DC) Input low frequency bypassing. The unregulated input voltage can be The “reference voltage” for the Modulated B- supply is a nega- measured at test point TP5. The negative output voltage, at test tive (inverted) sample of the analog audio signal and dc power point TP7 and J2 pins 1 and 2, depends on transmitter power and control signal, from the output of the Analog Input board (A35).
Page 259 Voltage sample divider resistances, compensation components, Three interlock status circuits pass through the DC Regulator and IC driver emitter resistances depend on supply load imped- Board: “Door Interlocks,” “External Interlocks,” and “Interlock ance, and will be different in different supplies. String DC.”...
Page 260 M.4.2.2 Shorted Transistor or Diode which is a type of zener diode, is in parallel with the triac, and A shorted Series Pass Transistor, or Shorted Diode From Pass the transzorb will conduct in the reverse direction if much over Transistor Emitter to Collector could be the cause.
Page 261 M.4.4.2 No -(Audio + DC) Signal Prior to starting a troubleshooting procedure check all switches, Check the input at J4 pin 10 for a -(Audio + DC) signal from the power cord connections, connecting cables, and power fuses. Analog to Digital Converter Board. 03/16/2009 888-2247-006 WARNING: Disconnect primary power prior to servicing.
Page 262 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 263 Section N External Interface (A28) Circuit Descriptions Introduction N.2.2 Each TYPE of interface circuit is described in the following This section describes the External Interface board and includes paragraphs. Sheet 3 of the schematic diagram provides a sum- a troubleshooting information. mary of information for each type of interface circuit, in the The External Interface board provides an interface between the “Characteristic Key”.
Page 264 N.2.4.3 Protection STATUS OUTPUTS. Refer to Figure N-1 for two possible Series resistors limit current to the opto-isolator; when input output configurations voltage is 15 volts, opto-isolator current is 40 mA. The resistor Control Inputs (Type B) N.2.4 network, a transzorb, and bypass capacitors protect the opto-iso- All extended control inputs (remote control inputs) are optically lator input from transient voltages.
Page 265 Figure N-2 External Interface, typical control input circuits. Figure N-3 Equivalent circuits for calculation effect of circuit loading on Monitor voltage outputs. 03/16/2009 888-2247-006 WARNING: Disconnect primary power prior to servicing.
Page 266 Two BNC coaxial connectors, J7 and J8, are provided for inter- connection to the combiner control unit when the DX-10 is used N.2.5.3 Circuit Description in a combined transmitter installation. The Technical Manual for...
Page 267 N.2.10.2 Zener Diode Regulated +15 and -15 Volts To determine whether the opto-isolator or transmitter logic is at Zener-diode regulated +15 volt and -15 volt supplies provide fault, monitor the voltage across the opto-isolator’s output ter- operating voltages ONLY for operational amplifiers U4, U5, U6 minals while activating the remote control input again.
Page 268 Possible Causes: ohmmeter to check for a short to the transmitter ground. A “good” transistor should read “open”. N.4.5.1 Problem In Transmitter Fault And Overload Logic Use a voltmeter or logic probe to check the logic level to the Symptom: No Monitor Outputs (Analog Sig- N.4.6 status interface circuit on the External Interface board.
Page 269 LED board is located above it. P.3.0.1 Basic Turn-On Sequence Requirements The DX-10 has no filaments to warm up, so a “Turn On Request” immediately starts the high voltage supply step-start sequence. Primary power is initially applied to the high voltage power...
Page 270 c. PA TURN-OFF (Logic LOW), from External Interface: f. RELEASE INHIBIT - H, logic output, to Power Control Generates “PA Off” logic signal, but does not de-energize logic: Inhibits clock, to prevent raise/lower controls from high voltage supply contactors. operating during turn-on d.
Page 271 signal at the one-shot’s “A” input prevents the turn-on AND gate U52C’s output goes HIGH. Gate U52C’s pulse from being generated. logic HIGH output is the “K2 drive” to the contactor drive circuit on the DC regulator board. (An “Inhibit c.
Page 272 Transmitter Turn-Off: Turn-On/Turn-Off lamp and corresponding remote status output will remain ON P.4.5 until the transmitter is turned OFF by depressing the “Off” Control Logic Sequence pushbutton or giving a remote control “Off” command. Some When you depress the “OFF” button, the HIGH, MEDIUM or turn-on functions occur, as follows: LOW button light goes out, you will hear contactor K2 de-ener- gize, and power output drops to zero.
Page 273 P.4.8 signal, and power level inhibit gates U43A, U43B, and U43C in Turn-On Sequence the Power control logic are the key to DX-10 “recycle ON” A Supply Fault during the turn-on sequence clears the Turn-On functions, as follows: one-shot, immediately de-energizing K1, and inhibits (blocks or a.
Page 274 “controller supply fault” low to high transition on power-up, and low, the regulator generates a “Supply Fault - L” output. the “clear” input edge trigger of U50, are the key to DX-10 A fast on/delay off circuit (U67A and U67B) holds this “recycle ON”...
Page 275 The “Supply Fault” signals also generate a Type 1 Fault induced b. “INHIBIT K2 - L,” to U52D input. “OFF” command, but a two-second delay in the Controller c. The “INHIBIT K2 - L” signal comes from U53C’s output board’s supply fault circuit inhibits this command so it is not and is generated by any of the following three conditions: latched.
Page 276 Contact De-Bounce and Logic Level Con- P.5.3 The 0.3 second and 0.8 second delays add, so that U57B gener- verter Circuits (Q5C-U59C, Q5D-U59B). ates a logic HIGH signal 1.1 seconds after K1 closes. This logic HIGH signal is an input to OR gate U58A, so that U58A’s output These circuits are both the same.
Page 277 a. At pin 1: EXTERNAL PA TURN-OFF (active LOW), transmitter’s fault and overload sections can generated Type 1 from the External Interface, and “PA OFF (active LOW) fault induced OFF commands, VSWR induced LOWER com- from PA OFF switch S5 on the Controller board when the mands, or Crowbar Fault induced LOW Power commands.
Page 278 Logic Flow in the Power Contol Section c. “Combiner crowbar fault” induced LOW POWER com- P.6.4 mand: (NOT USED IN THE DX-10). Normal logic flow will be described. Refer to Figure P-3, Power Control Section Block Diagram. “Fault” and “Reset” signals will Don’t confuse the “Off”...
Page 279 Crowbar Fault is present, by a section of quad 2-input OR gate “word,” and sends that data to the Analog Input board U46 (the Combiner Crowbar Fault is not used on the DX-10). (address data from latch, step 4b, above).
Page 280 P.7.2 again pulling the collector line to ground (unless the “Local-Re- In the DX-10, these three gates act as buffers. The output of each mote” switch is in the “Local” position). The opto-isolator’s gate is normally HIGH and goes LOW when its control input is internal transistor is paralleled with the corresponding Local active (Control inputs are U46C-9, U46B-5, and U46A-2).
Page 281 “Priority Encode/Decode Function Table,” shows logic signals OFF command is given. This prevents any new command from for the Encoder and Decoder circuit in the DX-10. operating, and prevents rapid on-off cycling of the transmitter’s high voltage supply which could result in damage if the supply There are some encoder/decoder control functions which are not used in this circuit, and are not shown in the figure.
Page 282 Figure P-5 Priority Encode/Decode circuit function tables. P-14 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 283 that Decoder IC U40 operates when pin 4 is LOW and is signals that strobes the latches on the Analog Input board, storing inhibited when pin 4 is HIGH. the new BCD power output data. P.7.6.5 Inhibit Decode One-Shot, U50B Power level (or “power mode”) commands are OFF, HIGH, When an “OFF”...
Page 284 seconds the voltage rises above inverting Schmitt trigger U51B’s this logic LOW signal forces the NAND gate output HIGH, threshold, and U51B’s output goes LOW. inhibiting any Power Level Change pulse. The output of U51B, then, is a logic HIGH pulse, like the one at The Power Level Change logic LOW pulse goes to the CLOCK the decoder’s output except that it is inverted and delayed by input of Power Level Latch U42, latching the new power level,...
Page 285 P.7.14.4 Digital Power Control Signals The DX-10 is turned ON with a HIGH, MEDIUM, or LOW The transmitter’s power output is controlled by a three-digit power level command, either from a front panel pushbutton BCD (Binary Coded Decimal) digital power control signal to the switch or a remote control command.
Page 286 P.7.15.6 Low Power Mode, “PRESET” Function (U44F) when “Raising” or “Lowering” power. Also, clock pulse inputs Although this function is not used in the DX-10 because the to these gates are present only when the transmitter is ON. When Combiner Crowbar is not used, the circuit is on the Controller the transmitter is OFF, and during the step-start cycle, clock board and will be described.
Page 287 P.7.16.2 Examples a. HI-HI circuit: U12 For each set of up-down counters (HIGH, MEDIUM and LOW), b. HI-LO circuit: U10, U11, U44C there are two control gates, one for counting UP and one for c. MED-HI circuit: U24 counting DOWN. The following description explains operation d.
Page 288 U16-U18, and U28-U30 are not used. The Controller printed Multiplex inputs. circuit board contains traces and mounting pads for these IC’s, but sockets and IC’s are not installed in the DX-10. These unused Multiplex and Output Buffers for BCD P.7.19...
Page 289 Figure P-6 Tri-State Buffers. Figure P-7 Multiplex and Latch simplified diagram. 03/16/2009 888-2247-006 P-21 WARNING: Disconnect primary power prior to servicing.
Page 290 P.7.21.3 Pulse Delay The Clock Inhibit gate inhibits clock pulses during the transmit- The “Data Strobe” signal is delayed, to allow the up/down ter’s step-start cycle, so that the “Raise” and “Lower” functions counters time to operate before the power data latches on the cannot operate.
Page 291 Interlock circuits and Interlock Relays K3 and K4 which are The “External Interlock” at External Interface TB1, terminals 1 inputs to this circuit are shown on the DX-10 Overall Schematic and 2, is a 24 volt ac circuit. Figure P-8 is a simplified diagram, Diagram, Sheet 2 (drawing 888-6208-241).
Page 292 Figure P-9 Controller board Interlock status logic simplified diagram. P-24 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 293 Interlock Status Logic: Outputs P.8.2 Each basic interlock circuit’s output (from U73A pin 1 or U73B pin 4) is then logic HIGH when there is no interlock fault. Each There are three outputs from interlock fault logic on the Control- output goes to the LED board, to status indicator circuits, and to ler board.
Page 294 Both the Door Interlock and External Interlock inputs return to goes “HIGH,” transistor Q13 turns ON, and its collector goes +30 volts if the interlocks are open. If this +30 volts fails, these LOW, starting the delay timer. (Transistor Q12B also turns ON; interlocks will not operate.
Page 295 P.8.4.6 “Inhibit” Transistor Q12B P.9.0.1 +5B Reset-L Output (U66A) Q12B prevents an “Interlock String” fault caused by de-energiz- Comparator U66A’s output goes LOW (almost to zero volts) ing External Interlock relay K3 from generating a “Door Inter- when the +5B supply drops below the comparator’s threshold, lock”...
Page 296 NOTE that batteries be replaced at least once a year so that you can be All Integrated Circuits supplied by the +5B backup supply are confident that they will operate when required. very low-power devices. It is possible to replace these IC’s with devices from other logic families (for example, TTL) which are functionally the same but have much higher current require- ments.
Page 297 Supply Fault Logic Outputs line goes to a “Regulator Fault Summary” indicator and to a P.11.5 “Fast on-slow off” delay circuit. P.11.5.1 “Data Clear” (from Buffer U67F-U67D) When a supply fault occurs, and for about 2 seconds after AC Each UC3834 voltage regulator IC includes an internal “Fault power returns, a Data Clear -L logic signal clears digital power Alert”...
Page 298 CMOS Integrated Circuits U54D and U54B provide forward and reflected power metering P.12.2 signals to the External Interface. Remote forward power meter- All “74HC—” and “74HCT—” series logic IC’s on this board ing circuit U54D includes a diode in the feedback loop to provide are CMOS integrated circuits, which can be damaged by elec- an output voltage that is nearly proportional to power (recall that trostatic discharge during handling.
Page 299 DX-10 Transmitter Fault Types Overcurrent”, “RF Under Drive”, or “RF Over Drive” indication The fault and overload circuits in the DX-10 can be grouped into is a latched Type 1 fault indication which must be reset. “FAULT TYPES,” depending on the action taken when a fault Remote fault indications for Type 2 Faults provide an indication is detected.
Page 300 Table Q-1 DX Fault types. TYPE 1 TURNS PA POWER SUPPLY OFF (Manual Restart Required) External Interlock Air Flow Fault DOOR Door Interlock SUPPLY FAULT PA Power Supply Protection OVER VOLTAGE PA Power Supply Overvoltage Protection CABLE INTERLOCK Modulation and Driver Encoder Cables DC Regulator B+ Regulated Fault DC Regulator B- Regulator Fault Output Monitor +5V on board Regulator Fault...
Page 301 Figure Q-2 Reset circuit simplified diagram. 03/16/2009 888-2247-006 WARNING: Disconnect primary power prior to servicing.
Page 302 Any Type 4 Fault causes a RED status indication until the supply indication. fault causing the indication is corrected. Type 4 Fault indications DX-10 Fault Types. Q.2.8 are not latched and cannot be reset. a. TYPE 1 — TURN TRANSMITTER OFF.
Page 303 NOTE to the LED board for Door Interlock or External Interlock Type 4 Faults do NOT turn the high voltage supply off. PA conditions. Turnoff is through the modulation circuits. “RESET A” and “RESET B” inputs to Type 1 Fault logic reset e.
Page 304 In addition to the VSWR-H logic pulse to PA Off Gate U66, the The paragraphs on “Type 6 Fault: Envelope Error” describe VSWR Logic on the LED Board also generates an RF Drive Envelope Error circuits on the LED board. The Envelope Error Switchover logic signal, a VSWR Induced Lower Command, a circuit audio inputs come from other sections of the transmitter;...
Page 305 NOTE “Reset A” and “Reset B” Operation “ON” and “OFF” in the DX-10 refer to the High Voltage Supply When a “RESET” is generated, Reset A goes low, clearing all and several “inhibit” functions. The low voltage supply remains fault status indication latches. At the end of the “reset”, Reset A ON whenever AC power is applied and Low Voltage Supply switch S11 is ON.
Page 306 b. “RESET B” goes from LOW to HIGH while a fault is still what the other gate inputs are. The output of U20D is then a present (the fault detection circuit output is HIGH). Reset RESET-H logic signal when either an EXT reset or a +5B Reset B goes from LOW to HIGH if one of two conditions occur: occur.
Page 307 a “Reset”; refer to the description of “Reset A and Reset B has cleared. If the fault is still present after resetting, the status Operation”, above, for more information. indicator will change to RED again when the “Reset” pushbutton is released or when the remote “Reset” command ends. A “Controller Supply Fault - L”...
Page 308 Type 1 Fault Logic Q.7.1 the fan to run backwards, removing the center rear panel on the back of the transmitter, or loose quarter-turn fasteners on the rear Type 1 Fault logic includes OR gate U10, OR gate U24C, “pulse panel.
Page 309 Figure Q-4 Air Flow fault circuit simplified diagram. e. Status indicator “Inhibit” gates which turn off all front- When a FAULT is latched, U15A’s Q output is HIGH and is panel status indications for a short time after initial turn-on inverted by U17D to a LOW and again by inverter U18D to a (U17B, 17D).
Page 310 This circuit is located on Fuse Board Assembly A24, and is U13A output is LOW. The Inhibit input of U13B is also LOW shown on sheet 2 of the DX-10 Overall Schematic Diagram. and air fault sensing is blocked (inhibited). When the Overdrive...
Page 311 +230VDC High Voltage (the “Over- sets the peak detector’s input level and dc output to the compa- load” sample on sheet 2 of the DX-10 Overall schematic dia- rator. gram. The sample goes to the non-inverting input of voltage U2C is an operational amplifier peak detector.
Page 312 inverter U45E to send a “Fault-H” logic signal to Type 1 Fault 2. IF THE FAULT DOES NOT REPEAT: All status gate U10 and to Cable Interlock status latch circuit U14A-U16A. indications and transmitter operation return to normal. (Refer to “Reset A and Reset B Operation” earlier in this section Type 2 Fault Status Indicators Q.8.2 for a description of latch operation and to “Type 1 Fault Status...
Page 313 Figure Q-8 Regulated Supply fault sensing crcuits. 03/16/2009 888-2247-006 Q-15 WARNING: Disconnect primary power prior to servicing.
Page 314 Q.8.4.4 RF Underdrive Fault Detector (U29C) “Underdrive Inhibit A” goes HIGH so that if RF drive is low (an The DC RF drive sample goes to the inverting input of compa- underdrive condition), a Type 2 Fault is generated. rator U29C, and the reference voltage goes to the non-inverting Q.8.4.9 Possible Causes of Underdrive During Turn-On input.
Page 315 to +5 volts through R115. Normally the comparator output is The logic LOW pulse from the not-Q output goes to status LOW (about zero volts) but if peak supply current exceeds the indicator circuits (described later) and to the “B” input of the preset threshold the comparator output goes HIGH (to about +5 second one-shot.
Page 316 Figure Q-5 Type 2 Fault logic simplified diagram. Q-18 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 317 Typically, the arc will extinguish within milliseconds of remov- schematic diagram; U27D is shown at location C2-C3 on the ing RF power, so the DX-10 turns the PA “OFF” within a diagram). microsecond of detecting a VSWR and holds it “OFF” for 14 to 19 milliseconds, then turns it back ON.
Page 318 PA “OFF” within a microsecond of detecting signal. The inverter’s output is a logic HIGH pulse when a VSWR, but typically only holds the PA “OFF” for about VSWR is detected, and goes to VSWR NOR gate U43C and 20 microseconds; by that time, the “VSWR Fault - L” Antenna VSWR one-shot U48A.
Page 319 Figure Q-6 VSWR Logic simplified diagram. 03/16/2009 888-2247-006 Q-21 WARNING: Disconnect primary power prior to servicing.
Page 320 Q.11.3.3 “VSWR Induced Lower” Circuits VSWR Self-Test Circuit Q.12 (Gate U46B or U46A, gate U50B, and one-shot U69B): The The “VSWR Self-Test” performs a test of VSWR logic AUTO- following description refers to the Bandpass Filter VSWR circuit MATICALLY each time AC power is applied to the transmitter, (U45C-U45D-U46B), but operation of the Antenna VSWR cir- and the operator can also perform a VSWR Self-Test MANU- cuit is identical (U45A-U45B-U46A).
Page 321 Figure Q-7 VSWR self-test logic simplified diagram. 03/16/2009 888-2247-006 Q-23 WARNING: Disconnect primary power prior to servicing.
Page 322 VSWR Self-Test, Circuit Description Q.12.1 U68A’s “B” input triggers one-shot U68A. When triggered, one-shot U68A generates 10 millisecond pulses at it’s Q and The following circuit descriptions refer to Figure Q-7, VSWR not-Q outputs. Self-Test Circuit, Simplified Functional Diagram, or to sheet 2 of the LED Board Schematic Diagram (drawing 839-6208-111) Self-Test Pulse to output Monitor A27 Q.13.3...
Page 323 “Clocks” the latch. The 0.5 millisecond logic LOW pulse from Each Type 4 Fault sensing circuit includes a voltage regulator U71C clears the latch, and when the pulse goes HIGH again the “Fault Alert” output and resistors on the Analog Input or A to D latch can be clocked.
Page 324 Q.15.1.7 DC Regulator Modulated B- Supply Fault (Type 1 occurs, however, the inverting input voltage goes below the Fault) reference voltage and the comparator input goes HIGH. This negative supply input has a pull-up resistor to +8 volts The Type 1 “Supply Fault” comparator outputs have capacitors unregulated on the DC Regulator board.
Page 325 Q.16.0.1 External Indicate: Envelope Detector Circuit Outputs Q.17.3 When the output of AND gate U67A is HIGH (“Conversion This circuit only provides status indicator outputs, including a Error Fault”), inverter U62E’s output goes LOW and inverter logic output to the external interface and a visual indication on U62B’s output goes HIGH, providing a Fault-H output to the the transmitter’s status panel.
Page 326 Comparator U73 Q.17.4.5 level will decrease about 150 millivolts. The Level and Offset The peak-detected audio signals are compared by a high-speed controls determine sensitivity but must also be set so that differ- comparator. Resistor R70 provides a small amount of offset ential signal levels are maintained at different power levels.
Page 327 Figure Q-9 is a simplified diagram of “RF Sense Circuits”. Also, inverters U55A and U55B, and AND gates U54A, U54C, and RF Sense circuits are shown on sheet 3 of the LED Board U54D, blocks red “fault” indications for following sections. Schematic Diagram, on the right hand side of the page.
Page 328 Q-30 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.
Page 329 Section R Switch Board/Meter Panel (A31) Introduction Both multiplexer U3 and the demultiplexer U8 are addressed via a counter IC U6, which is incremented by each closure of the The switch board provides manual pushbutton control for trans- selection switch. At power up, the address is set to 000, which mitter ON/OFF functions, allowing LOW, MED, and HIGH selects the first multimeter position automatically.
Page 330 R.1.4.1 Negative 15 Volt Power Source be checked on other circuit boards in the non-interlocked IC U14 provides the negative power supply voltage that is compartment. The paragraphs on “Principles of Opera- needed by the various op amps. See sheet 2. tion”...
Page 331 This list includes the test equipment that should be available to • Audio function generator capable of producing non-symet- perform most of the basic maintenance and troubleshooting rical ramp and triangle modulation. functions of the DX-10. • RF impedance bridge or Vector impedance meter • •...
Page 332 888-2247-006 03/16/2009 WARNING: Disconnect primary power prior to servicing.

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