Ericsson EDACS MTL Maintenance Manual

800 mhz

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INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TEST EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

FRONT COVER TEST ACCESSORY KIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

FUNCTIONAL TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DISASSEMBLY /REASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ALIGNMENT PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SET-UP PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TRANSMITTER ALIGNMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

RECEIVER ALIGNMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TRACKING AND CHANNEL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

REAR COVER ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

FRONT COVER ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

COMPONENT REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SURFACE MOUNTED COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SURFACE MOUNTED COMPONENT REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SURFACE MOUNTED COMPONENT REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . .

SURFACE MOUNTED IC REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MODULE REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

INTERNAL LITHIUM BATTERY REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . .

WEATHERPROOF INTEGRITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

BATTERY PACKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CHARGING THE BATTERY PACKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

REDUCED CAPACITY CONDITION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

RECHARGEABLE BATTERY PACK DISPOSAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CONTROL KNOB STOP PLATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

STOP PLATE REPOSITIONING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MODULE AND INTEGRATED CIRCUIT DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

INTRODUCTION

This manual outlines service procedures for the EDACS

MTL 800 MHz portable radio. Information includes radio

disassembly and reassembly procedures, RF alignment and

component-level troubleshooting steps. Information is also

included for tracking and channel data, surface mounted

component replacement, weatherproofing procedures, and

service data on the batteries. Module and integrated circuit

data sheets are listed at the end of this manual.

MAINTENANCE MANUAL

EDACS ™ MTL ™ 800 MHz

SERVICE SECTION

In order to perform many of the following alignments,

tests and troubleshooting checks, it will be necessary to

(re)program the radio. Further programming information can

be found in the EDACS Programming Manual and software

TQ-3364.

It is suggested that an improperly operating radio be first

bench tested thoroughly in conventional mode. This allows

the technician, using standard test equipment, to verify the

majority of the radio's circuitry is functional. Any necessary

repairs can be completed and the radio can then be tested in

LBI-38632A

Page

Table of Contents

Troubleshooting

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Summary of Contents for Ericsson EDACS MTL

Page 1: Table Of Contents
LBI-38632A MAINTENANCE MANUAL EDACS ™ MTL ™ 800 MHz SERVICE SECTION TABLE OF CONTENTS Page INTRODUCTION ..........TEST EQUIPMENT .
Page 2: Test Equipment
Board while still in the radio’s case. All of the switches and LBI-38518 Front Cover Test Accessory Kit the logic circuitry can be tested via the PC connection. Status Manual of the switches is displayed on the PC. Copyright© March 1991, Ericsson GE Mobile Communications Inc.
Page 3: Functional Test
LBI-38632 Test points are provided for the volume control and TOOLS REQUIRED microphone audio. A resistor network on the Front Cover Test Cable provides a dc bias to the mic in the absence of the • TORX ® T6 Driver Control Board’s bias.
Page 4: Control Board Access
LBI-38632 Table 1 - Torque Specifications LOCATION LB-IN. Rear/Front Cover Assembly Screws Rear Cover Assembly Antenna Insert 10.0 UDC RF Connector 10.0 RF Board/Eggcrate Screws PA Support Screws 10.0 Antenna Switch (SW1) Screw Front Cover Assembly Knob Set Screws (earlier) Knob Set Screws (later) Group/Channel and Volume Nuts UDC Ground Screw...
Page 5 LBI-38632 and carefully slide the controls inside the radio. Unscrew the UDC Flex/UDC/Monitor Button/PTT Switch two (2) screws (G and GG) and remove the J10/P10 Zebra Assembly Removal strip securing plate (HH). See Figure 5. The Keypad Flex is now free for removal. Additional screws (J and JJ) secure If UDC Flex/UDC/Monitor Button/PTT Switch assem- the LCD Board used with the M-PA series radios.
Page 6: Alignment Procedures
LBI-38632 Speaker Flex Removal SET-UP PROCEDURE In order to replace the Speaker Flex, it must be un-sol- 1. Separate the Front and Rear Cover Assemblies and con- dered from the speaker and the Battery Plate. nect the RF/Logic Extender cable between the RF Board and the Control Board.
Page 7: Transmitter Alignment
LBI-38632 5. Remove power from the radio and replace the PC pro- TRANSMITTER ALIGNMENT gramming cable with the TQ-0609 Test Box. 6. Connect the radio to the wattmeter using the RF Antenna The following infomation can be used to test and align the transmitter’s output and its modulation characteristics.
Page 8 LBI-38632 Table 3 - Maximum Transmitter Frequency Errors* And Typical VCO (TP2) TX Tuning Voltages CHANNEL TOLERANCE* LOWEST HIGHEST VCO TUNING BAND SWITCH (MHz) (Hz) (MHz) (MHz) VOLTAGE (J102 pin 3) ±1209 806.012500 806.011291 806.013709 1.5 Vdc ±1223 815.512500 815.511277 815.513723 2.9 Vdc ±1236...
Page 9: Receiver Alignment
LBI-38632 VCO Modulation Distortion Test Measure transmitter audio distortion on the LOW, MID- NOTE DLE and HIGH-side test channels. Distortion readings should be less than 3% at ±3 kHz deviation with a 1000 Hz VCO Modulation adjustment should only be neces- tone.
Page 10: Tracking And Channel Data
LBI-38632 altered for the above reason, it will be necessary to reprogram 12 dB SINAD and Distortion Tests all channels to establish the new default data for each chan- nel. See the Programming Manual for further information on 1. Connect the distortion analyzer or SINAD meter to the altering Tracking and Channel Data.
Page 11: Transmitter Troubleshooting
LBI-38632 2. Check for 5.4 Vdc ±0.1 Vdc at J102/P2 pin 6 with the Transmitter Troubleshooting transmitter enabled. Also check the operation of the TX 5.4V switch to insure 5.4 Vdc is being delivered to the Inoperative Or Low Power RF Board at J101/P1 pin 5 when the PTT button is pressed.
Page 12 LBI-38632 Table 5 - General Troubleshooting SYMPTOM POSSIBLE CAUSES Completely inoperative (no audio 1. Dead Battery Pack. and no LCD indication) 2. Fuse blown: Check radio fuse in Battery Plate. 3. Control Board problem. At power-up, radio beeps: twice (once in addition to 1a.
Page 13 LBI-38632 1. Verify modulating audio is present on J102/P2 pin 1. A 2. Check RX AUDIO on J101/P1 pin 4 for signal and/or noise. With an RF input modulated at 1 kHz, ±3 kHz 1 kHz, 600 mV rms TX AUDIO signal at this point should produce approximately ±5.0 kHz deviation.
Page 14: Synthesizer Troubleshooting
LBI-38632 Squelch Problem 4. Using a frequency counter with a high impedance probe or amp, check TP8 for the 13.2 MHz (±20 Hz at room temperature) signal from Reference Oscillator U4. Re- A squelch circuit problem (assuming good signal and/or place U4 if this signal is not present and pin 1 is 5.4 Vdc.
Page 15 LBI-38632 TEST POINTS 455 kHz IF Output From Receiver Back- Band-Switch Input To VCO End U14 (High = TX 806 - 825 MHz) (Low = TX 851 - 870 MHz) VCO Tuning Voltage From PLL Filter A1 (High = RX 851 - 870 MHz) LO Injection To Mixer U7 45.0125 MHz IF Input To Receiver Back- End U14...
Page 16: Front Cover Assembly
LBI-38632 FRONT COVER ASSEMBLY Completely Inoperative Radio The following outline will help lead the service techni- Check Power Supplies cian to a problem with the Control Board or other associated control circuits. The Control Board should be removed and Power supplies should be the first area to check in the electrically extended from the front cover for troubleshoot- event of a completely inoperative unit.
Page 17 LBI-38632 A failure of R133 or R57 most likely indicates a shorted Monitor U7 pin 49 when the unit is powered-up; C46’s decoupling capacitor on the associated supply rail. Tempo- charge should be seen. Pin 49 should reach a final value of rarily remove the flex connections to assure there is no short 5.4 Vdc within 100 milliseconds after power-up.
Page 18 LBI-38632 Table 7 - Clock Test Points FREQUENCY MAXIMUM ERROR TEST POINT CRYSTAL / IC (MHz) (Hz) ±200 Y4 / U18 2.0000 ±1100 Y1 / U5 11.0592 ±800 Y3 / U7 8.0000 Figure 10 - Keypad Scanning Waveforms Check Inter-processor Communication Message transfers from the Personality Micro to the I/O Micro are primarily commands which cause the I/O Micro to execute a commanded function.
Page 19 LBI-38632 to Personality Micro transfers are initialized by the I/O channel is changed. See Figure 8. If these signals are not Micro pulling its handshake output (UPHSIN) low. present, suspect a defective I/O Microcontroller. A fail- ure of only one signal points to an open series resistor Inter-processor communication failure will generally on the Control Board or a defective output from U18.
Page 20 LBI-38632 2. Check for logic 1 at U4 pin 11 (inverted UDCTXDATA). 3. If the internal microphone is operating normally, suspect Pulses should be seen when a radio read is attempted. the UDC Flex or op amp U19.1. Connect an external Suspect U11.3, R7, R8, or CR1 if they are not.
Page 21 LBI-38632 Table 8 - Transmitter Audio Signal Levels (110 mV rms, 1 kHz EXT MIC input) TEST LOCATION LEVEL (mV p-p) COMMENT U19 pin 1 (TP9) External Mic Amp Output (BUFEXTMIC) U7 pin 13 Audio Processor External Mic Input U7 pin 26 2700 * Audio Processor TX Audio Output U6 pin 7 (P2 pin 1)
Page 22 LBI-38632 Squelch Circuits face-down on the bench, apply audio from a signal generator to the second and third pins from the left. The speaker impedance is 24 ohms and it is a 1/2 Watt device. There should be a dc voltage on U7 pin 4 between 2.7 Vdc and 5.0 Vdc (proportional to receiver noise).
Page 23 LBI-38632 • 2. Check U14 pin 9. It should be high for 800 MHz EDACS KYBDINCS (SER ENA) is pulsed to latch new instan- applications. taneous row data into shift register U1 on the Keypad Flex. (Any row with a closed switch contact will latch a 3.
Page 24: Component Replacement
LBI-38632 PWB pads to separate from the board if all solder is not COMPONENT REPLACEMENT completely liquefied. 4. It may be necessary to remove excess solder using a SURFACE MOUNTED COMPONENTS vacuum de-soldering tool or Solderwick ® . Again, use great care when de-soldering or soldering on the printed wire boards.
Page 25 LBI-38632 TEST POINTS OS1 = 2.0 MHz Clock From I/O DTMF Tones Microcontroller U18 11.0592 MHz Clock From Modem 2.7 Vdc Reference Supply (VCC/2) U5 (OSCOUT) 8 MHz Clock Output From Audio Reset Output From Modem U5 Processor U7 5.0 Vdc Regulated Supply (+5V) Internal Mic Amp Output (BUFINTMIC) Reset Comparator Output (VCB)
Page 26: Module Replacement
LBI-38632 Replacement of a surface mounted IC is best completed INTERNAL LITHIUM BATTERY using a hot-air soldering system. The IC can easily be re- REPLACEMENT moved and installed using hot air. See the manufacturers instructions for complete details on tip selection and other operating instructions unique to your system.
Page 27: Battery Packs
LBI-38632 These seals should be inspected during any disassem- BATTERY PACKS bly/reassembly process for cracks and tears. A defective seal warrants replacement. See the Mechanical Parts breakdown drawings and the Parts Lists for locations and part numbers Battery packs available for use with the radio include for these seals.
Page 28: Charging The Battery Packs
"knee" is not necessary. still connected to the unit. The battery charging contacts are 2. Complete a full charge cycle using an Ericsson GE diode protected from external shorts. charger.
Page 29: Control Knob Stop Plate
LBI-38632 2. Lift the stop plate using small needle-nose pliers. CONTROL KNOB STOP PLATE 3. Reposition the stop plate by aligning the raised bar to the channel marking one (1) number higher than the A stop plate is normally installed under the Control number of positions required.
Page 30: Module And Integrated Circuit Data
LBI-38632 RF BOARD MODULE AND IC DATA (19C852056, Sh. 1, Rev. 0) (19C852057, Sh. 1, Rev. 1) PLL FILTER/REGULATOR 19C852056G1...
Page 31 RF BOARD MODULE AND IC DATA LBI-38632 (19C851922, Rev. 2) (19C851920, Rev. 0) POWER CONTROLLER 19C851922G1...
Page 32 LBI-38632 RF BOARD MODULE AND IC DATA FLA1, FLA2 RF BANDPASS FILTER 19A704888P1 FLB1 IF MONOLITHIC CRYSTAL FILTER 19A705328P5 806 - 870 MHz POWER AMPLIFIER 19A705962P1...
Page 33 RF BOARD MODULE AND IC DATA LBI-38632 ANTENNA T/R SWITCH 19A149809P1 SYNTHESIZER 19B800902P4 13.2 MHz REFERENCE OSCILLATOR 19B235948G1...
Page 34 LBI-38632 RF BOARD MODULE AND IC DATA LOW-PASS FILTER 19A149810P1 800 MHz MIXER 19A705706P3...
Page 35 RF BOARD MODULE AND IC DATA LBI-38632 PRESCALER 19A705985P1 800 MHz EXCITER (19C337499, Rev. 0) 19C851848G1...
Page 36 LBI-38632 RF BOARD MODULE AND IC DATA 800 MHz RF AMPLIFIER (19C851859, Rev. 0) 19C851857G1 45.0125 MHz IF AMPLIFIER (19C337062, Rev. 2) 19C336876G1...
Page 37 RF BOARD MODULE AND IC DATA LBI-38632 RECEIVER BACK-END (19C337500, Rev. 2) 19B801642G1 VCO (earlier) 19B235947G1...
Page 38 LBI-38632 RF BOARD MODULE AND IC DATA (19C852149, Sh. 1, Rev. 6) VCO (later) (19C852147, Sh. 1, Rev. 0) 19C852149G1...
Page 39 CONTROL BOARD IC DATA LBI-38632 2.5-VOLT REFERENCE 19A149634P1 8K x 8-BIT STATIC RAM 19A705603P7...
Page 40 LBI-38632 CONTROL BOARD IC DATA 64K x 8-BIT EPROM 19A705963P2 TRI-STATE TRANSCEIVER 19A703741P118...
Page 41 CONTROL BOARD IC DATA LBI-38632 8-BIT MICROPROCESSOR 19A705557P3 MODEM 19A704727P5...
Page 42 LBI-38632 CONTROL BOARD IC DATA U6 & U8 QUAD OP AMP 19A702293P1 AUDIO PROCESSOR 19A705851P1...
Page 43 CONTROL BOARD IC DATA LBI-38632 DUAL AND/OR GATE 19A703483P113 AUDIO AMPLIFIER 19A705452P2 HEX INVERTER 19A703483P304...
Page 44 LBI-38632 CONTROL BOARD IC DATA U12 & U19 DUAL OP AMP 19A702293P2 QUAD MULTIPLEXER 19A700029P633 QUAD COMPARATOR 19A704125P1...
Page 45 CONTROL BOARD IC DATA LBI-38632 MICROCONTROLLER 19A149861...
Page 46 LBI-38632 KEYPAD FLEX IC DATA 8-BIT SHIFT REGISTER 19A704423P2 8-BIT LATCHING SHIFT REGISTER 19A704423P3...

Ericsson EDACS MTL Maintenance Manual

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INTRODUCTION

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Troubleshooting

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