Agilent Technologies 4284A Service Manual
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Agilent Technologies 4284A Service Manual

Precision lcr meter
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Agilent Technologies 4284A Service Manual

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  • Page 1 Artisan Technology Group is your source for quality new and certified-used/pre-owned equipment SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT • FAST SHIPPING AND DELIVERY Experienced engineers and technicians on staff Sell your excess, underutilized, and idle used equipment at our full-service, in-house repair center We also offer credit for buy-backs and trade-ins •...
  • Page 2 NOTE Manual change supplement are revised as often as necessary to keep manuals as current and accurate as possible. Agilent Technologies recommends that you periodically request the latest edition of this supplement. Free copies are available from all Agilent Technologies offices.
  • Page 4 Page 3-3, Figure 3-1. Assembly Identification (1/2): Exchange the assembly labels A40 and A50. (In HP 4284A, A40 is on the right of A50) Page 3-14, Table 3-7_ Rear Panel Components: See Parts Information Table at the end of this supplement.
  • Page 5 � CHANGE 1 Page 1-A30-4, Table 1-46. A30 Handler Interface Replaceable Parts List: See the Parts Information Table at the end of this supplement. Page 1-A30-5, Figure 1-44. A30 Handler Interface Component Locations: Replace the component locations with Figure 1 Page 1-A30-5, Figure 1-45.
  • Page 6 • Replace W5, W6, and W7 with J4 and W3 as shown next. +12V • Replace W8 with J5 and W4 as shown next. • Replace W9, W10, and W11 with J6 and W5 as shown next.
  • Page 7 G- 01:> -E> <>-"H ) G-OEI:I -E> G- E :>-E> � @� G- � I:I -E> G-9ZI:I -E> �18! � "'0 G-S�I:I -E> -CID [)<>- " . u. 0 G- 11:1 -E> � G-IZII:I-E> G-E ZI:I -E> :;:::; <U A30XIB Pin No.
  • Page 8 � CHANGE 2 Page 4-A7 -3, Table 4-A7 -2. A7 Digital Control Replaceable Parts Lists (4/4) Change the version number to 1.11. See Parts Information Table at the end of this supplement. Table 1. Parts Informatio n CHANGE PAGE Note Reference Description Part Number...
  • Page 10 Agilent 4284A PRECISION LCR Meter (Including Option 001, 006, 201, 202, 301) Service Manual SERIAL NUMBERS T his manual applies directly to instruments whose serial number prefix is 2826J-, 2832J- or 2848J-, and whose ROM-based firmware version 01.10. For additional important information about serial numbers, read "SECTION 1, SERIAL NUMBER of this Service Manual."...
  • Page 11 T his document contains proprietary information that is protected by copyright. All rights are reserved. No part of this document may be photocopied, reproduced, or translated to another language without the prior written consent of the Agilent Technologies. Agilent Technologies Japan, Ltd.
  • Page 12 Manual Printing History T he manual printing date and part number indicate its current edition. T he printing date changes when a new edition is printed. (Minor corrections and updates that are incorporated at reprint do not cause the date to change.) T he manual part number changes when extensive technical changes are incorporated.
  • Page 13 Safety SUInInary T he following general safety precautions must be observed during all phases of operation, service, and repair of this instrument. Failure to comply with these precautions or with specific WARNINGS elsewhere in this manual may impair the protection provided by the equipment. In addition it violates safety standards of design, manufacture, and intended use of the instrument.
  • Page 14 Agilent Technologies. Buyer shall prepay shipping charges to Agilent Technologies and Agilent Technologies shall pay shipping charges to return the product to Buyer. However, Buyer shall pay all shipping charges, duties, and taxes for products returned to Agilent Technologies from another country.
  • Page 15 Exclusive Remedies The remedies provided herein are buyer's sole and exclusive remedies. Agilent Technologies shall not be liable for any direct, indirect, special, incidental, or consequential damages, whether based on contract, tort, or any other legal theory. Assistance Product maintenance agreements and other customer assistance agreements are available for Agilent Technologies products.
  • Page 16 TABLE OF CONTENTS SECTION 1 . GENERAL I NFORMATION 1 - 1 1 - 1 . INTRODUCTION 1 - 1 1 -2. MANUAL ORGANIZATION 1 - 1 1 -3. INSTRU MENT COVERED BY THIS MANUAL 1 -1 1 -4. RECOMMENDED TEST EQUIPMENT 1 -2 SECTION 2.
  • Page 17 T ABLE OF CONTENTS SECTION 3. ASSEMBLY SERVI CE I NFORMATIONS 3-1 . I NTRODUCTION 3-2. SAFETY CONSIDERATIONS 3-3. RECOMMENDED TEST EQU IPMENT 3-4. AFTER SERVICE PRO DUCT SAFETY CHECKS 3-5. ASSEMBLY DESIGNATIONS AND LOCATIONS 3-6. REPLACEABLE MECHAN ICAL PARTS LIST 3-7.
  • Page 18 TABLE OF CONTENTS SECTION 4. SERVICE SHEETS I NTRODUCITON 4- 1 . 4- 1 4-2. CIRCUIT DESCRIPTION 4-3. TROUBLESHOOTING AIDS 4- 1 4-4. BOARD CON NECTOR PIN ASSIGNMENT 4-5. REPLACEABLE PARTS LIST 4-5- 1 . Abbreviations 4-5-2 . Replaceable Parts Lists 4-5-3.
  • Page 19 A-2. MANUAL CHANGES A- 1...
  • Page 20 , and faulty board isolation procedures). When repairing the HP 4284A: refer to this section first, isolate the faulty board, and then repair the H P 4284A at the component level using the faulty board 's service sheet in S ECTION 4.
  • Page 21 1 -4. R ECO M M E N D E D TEST EQU IPMENT Table 1 -1 lists the equipment required for adjustment, performance testing , and trouble­ shootin g the HP 4284A. Other equipment may be substituted if it meets or exceeds the critical specifications given in Table 1 -1 .
  • Page 22 Table 1 -1 . Recommended Test Equipment (1 of 2) Recommended Model Equipment Requirements H P 5334B Electronic Frequency: 20 Hz to 1 M Hz Accuracy: «0.01 % Counter H P 3458A R M S Frequency: 20 Hz t o 1 M H z P,A,T Voltmeter Voltage range: 5 m to 20 Vrms...
  • Page 23 Table 1 -1 . Recommended Test Equipment (2 of 2) Recommended M odel Equipment Requirements Bias I F No substitute HP P N 42841 -6 5001 Simu lator H andler No su bstitute HP P N 04278-65001 Simulator No substitute Scanner HP P N 04278-65301 Si mulator...
  • Page 24 Meter is within its published specifications after it has been repaired . These adjustments should be performed along with periodic maintenance to keep the H P 4284A in o ptim u m operating condition. The recom mended calibration cycle is six months. If proper perfor­...
  • Page 25 2-4. ADJUSTABLE COMPON E NTS Table 2-1 lists the H P 4284A's adjustable components , the name of the adjustment related to each component, and g ives a brief description of each adjustment.
  • Page 26 2-5. ADJUSTMENT I NTERACTION Some of the HP 4284A adjustments are interactive. If you repair or replace an HP 4284A assembly, be s u re to perform the related adjustment(s) in the sequence g iven . Table 2-2 lists the adjustments required for each assem bly repaired or replaced. I gnoring or changing the adjustment sequence will make it impossible to obtain optimum performance.
  • Page 27 Turn the H P 4284A ON and let it warm-up and stabilize for at least 30 minutes. After the warm-up period , initialize the instrument. If the H P 4284A fails its self test or if you can 't initialize it, refer to the troubleshooting procedures in this service manual .
  • Page 28 D ISASSEM BLY, TOP COVER REMOVAL To gain access to the adjustment poi nts, perform the following procedu re. 1 . Remove the two plastic instrument-feet located at the u pper corners of the rear panel. 2. Fully loosen the top cover retaining screw located at the back of the top cover. 3.
  • Page 29 2-7. ADJUSTMENT PROGRAM The Adjustment Program is req uired when pe rforming parts of the HP 4284A's adjustments. Table 2-2 shows which adjustments req uire the adjustment program . Table 2-2. Adjustment Program Requirement Paragraph Adjustment Program Adjustment Name Power S upply Adjustment...
  • Page 30 STEP STE P 1 : Copyright and other information are displayed. STEP2: The HP 4284A's H P- I B address must be registered to the adjustment program to control the HP 4284A by H P-l B. STEP3: Adjustments can be selected using the softkeys. The p rogram is finished by pressing th e ' Exit' softkey.
  • Page 31 5. Turn the HP 4284A, HP 3458A, and computer O N . 6 . Change the H P 3458A's H P-IB address, i f i t i s same as the HP 4284A ' s . Boot up BAS IC a n d load the necessary binary files i n the computer. T h e neces­...
  • Page 32 8 . Load the cali bration program in the computer, the file name is "ADJ_ 4284A". NOTE Do not remove the Adjustment Program Disk from the computer while the adjustment program is running. 9. Press the computer's RUN key, then copyright and other information are dis­...
  • Page 33 H P 1 0431 A PROCEDURE: 1 . M ake sure the H P 4284A is turned OFF. 2 . Loosen the two screws holding the left hand side top sh ield plate (the shield plate on which the WARNING message is printed), and remove it.
  • Page 34 DC, 1 MQ T I M E BASE Range: Turn the H P 4284A ON . ± 7. Adjust A1 R 1 9 (FREQ-ADJ) until th e period (T), o f th e waveform , is 1 2 .5 u s us, as shown in Figure 2-5 .
  • Page 35 A7TP 1 . Figure 2-7 shows the location of A7TP1 and A7TP2 . 2 Alligator clips to 1 Dual Banana Plug Test Lead 10 A7TP2 Lompul HI Inpul A7TPi HP 4284A MU LTIMETER �ooo coco o 0 0000 0" ccco...
  • Page 36 4. Turn A1 R52 (V-AOJ) fully CCW (Counter Clock-Wise). Fig u re 2-7 shows A1 R52's location. V ± 5. Adjust A1 R52 u ntil the m u ltimeter reads 5 0 .05 V. 2-1 3...
  • Page 37 2-9. S E N S E A M P LIFIER DC OFFSET ADJUSTMENT This adjustment m inimize the DC offset voltage between the voltage channel sense amplifier and the current channel sense amplifier. EQUIPM ENT: HP 3458A M u ltimeter Calibration R-L Standard HP 1 6074A Extender Board (For Analog Board)
  • Page 38 Alligator clips to 1 Dual LO Input to A3TP4 Hi Input to A3TP6 Banana Plug Test Lead A3 Board 4284A M U LTI M E TE R 000 o ooo 0 G-B-+-- _ c:J c::J C c:J � � � � � �...
  • Page 39 2-1 0. DC BIAS LEVEL ADJUSTMENT (OPTION 001 ONLY) This adjustment updates the E E PROM Calibration Data to set the DC bias voltage. The adjustment program is necessary to perform this adjustment. EQU IPMENT: H P 9826A Computer M ultimeter HP 3458A H P-I B Cable H P 1 0833A...
  • Page 40 3. Perform the signal source adj ustment according to the program 's instruction. Figure 2-1 1 shows the adjustment setup, Fig u re 2-1 2 shows the location of A5 R 1 1 (OSC LVL). M O D O HP 4284A D ODO B cm MULTI M ET E R...
  • Page 41 TEST SIGNAL BIAS (2) Test S ignal Level M onitor Adjustment Setup �oo�oo: o � H P 4284A M U LT I M ET E R B N C(f)-dual banana c o c o plug Adapter � � � :; � �...
  • Page 42 2-1 2. I M PEDANCE MEASUREMENT ADJUSTM ENT This adjustment m inimizes the null amplifier DC offset and the zero offset, and then updates the E E P R O M calibration data to optimize the impedance measurement accuracy. NOTE All othe r adjustments must have been completed before perform i n g this adj ustment.
  • Page 43 2 Alligator clips to 1 Dual Banana Plug Test Lea d Lo input to A2T P4 HP 4284A � Hi input to A2TP3 MU LTIMETER Cl Cl Cl ClCl ClCl Cl Cl C Cl 0 0 000 � � � � � �...
  • Page 44 R224. W301 , W302 and W303 are related to R324. Fig u re 2-1 7 shows the rela­ tion between the jum per setti ngs and the adjustabl e range. After changing the jumper settings, press the 'Retry' softkey to reset the H P 4284A's adju stment conditions.
  • Page 45 5. Perform the impedance measurement adjustment (EEPROM data upd ating) accord ing to the program instruction. Figure 2-1 8 shows the adjustment setup . 42 8 4A OClD 0 0 000 0000 0 0 0 0 Test Leads - - - /1\\ Standard Standard...
  • Page 46 ASSEMBLY SERVICE INFORMATION 3-1 . I NTRODUCTI ON This section provides assembly service information for the HP 4284A P R EC I S I O N LCR M ETE R (20 H z to 1 M H z) assemblies. 3-2. SAFETY CONSIDERATIONS This section contains WARNINGS and CAUTIONS that must be followed for your protection and to avoid damaging the equipment.
  • Page 47 3. Check the GUARD terminal on the front panel using the procedure outlined in step 4. U n plug the 4284A's power plug from t h e power source. Set t h e power switch to O N . Tie the line and neutral pins of the power connector together and check the resistance between them and the instrument's enclosure.
  • Page 48 3-5. ASSE MBLY DESIGNATIONS AND LOCATIO N S Assemblies, such as printed circuit boards, are assigned sequential n umbers, A 1 , A2 etc. , as shown in Figure 3-1 . Figure 3-1 also gives the location of the assemblies. A 5 0 A3 0/A31 A 4 0...
  • Page 49 A9 0 Assembly No. Assembly Name Keyboard Assembly A1 0 Memory Card Board Assembly A1 3 DC-AC Converter Board Assembly Keyboard/Display Control Board Assembly A9 1 LCD M odule Assembly Figure 3-1 . Assembly Identification (2/2)
  • Page 50 3-6. RE PLACEABLE MECHANICAL PARTS LIST The replaceable mechanical parts are listed in Tables 3-1 to 3-9 . The o rdering information is given in SECTI ON 4. Table 3-1 . M ajor M echanical Parts Reference Part Number Description Designator 508 1 -881 9 Front Cap...
  • Page 51 Table 3-2 . Top View ( Top cover removed) Reference Part Number Description Designator 1 400-1 048 Edge Saddle 04278-00633 Top Plate over A 1 board 04284-00625 Top Plate over A2 thru A7 051 5-1 550 Screw 1 400-1 334 Cable Clamp 6 (Opt001 ) 1 400-1 334...
  • Page 52 Table 3-3. Bottom View ( Bottom cover removed ) • , � . � Reference Part Number Description Designator 051 5-1 550 Screw Pan-Head 0403-0285 Rubber Foot Cable Clamp 1 400-1 334...
  • Page 53 Table 3-4. Front Panel Assembly Components (1 /2) - r- - Dio de...
  • Page 54 Table 3-4. Front Panel Assembly Components (2/2) Reference Description Part Number Designator 04279-01 201 Holder 0535-003 1 1 400-0249 Cable Tie KEY&OISP Control U nit 04278-66590 051 5-1 550 Screw 04278-6651 0 Memory Card Board 04278-40002 Bezel Knob 04278-40003 04278-08001 Spring 3050-0891 Waher (F)
  • Page 55 Table 3-5. Front Panel Components Reference Part Number Description Designator 04284-00201 Panel , Front 04284-00202 Sub Panel 04278-40001 Bezel (Display) 3 1 50-0541 Filter 04278-00205 Plate 051 5-1 550 Screw 04278-25001 Ru bber Key 04278-40005 Bezel (Key) 0370-2446 Knob 1 250-0252 BNC Connector 5040-3324 Insulator (outside)
  • Page 56 Table 3-6. Shield Case And Heat Sink (1 of 3) A3 Board Board Reference Description Part Number Designator 04278-00601 Shield on component side Screw Pan-Head 051 5-1 550 04278-00602 Shield on circuit side Screw Flat-H ead 051 5-1 007 04278-01 204 Heat Sink for C R28,CR29 , CR30,and CR39 051 5-1 550...
  • Page 57 Table 3-6 . Shield Case And Heat Sink (2 of 3) A4 Bo a rd (rev a ,b) ® Board (rev c,d) Board Reference Part Number Qty Description Designator 04284-00660 (rev a,b) Shield on component side 051 5-09 1 4 Screw Pan-Head 04284-00632 Shield on circuit side (Large)
  • Page 58 Table 3-6_ Shield Case And H eat Sink (3 of 3) ® ® A6 Boa rd Board Reference Part Number Qty Description Designator Shield o n component side 04284-0061 0 051 5-1 550 Screw Pan-Head � 04284-0061 1 Shield on circuit side 051 5-1 005 Screw Flat-Head 1 205-0696...
  • Page 59 Table 3-7 . Rear Panel Components Re f erence Part Number Qty Descr i pt i on Part Number Qty Desc r i pt i on Ref erence D e s i gnator D es i gnator Cab l e Assemb l y 04284 - 6 1 61 1 ( s t d ) B l ank Panel...
  • Page 61 The 4284A's mechanical components are secured using metric threaded faseners. Many faseners in the 4284A may appear to be Phillips type, but they are in fact, Pozidrive type. To avoid damaging them, use only Pozid rive screwdrivers to remove or tighten Pozid rive type faseners.
  • Page 62 3-8-2. A1 ASSEMBLY REMOVAL 1 . Loosen the two screws which secure the left hand side top shield plate . Don ' t completely remove them. NOTE There are two top shield plates. To gain access to the A1 assem bly, remove the top shield plate which has the WARNING message printed on it.
  • Page 63 3-8-4. FRONT PANEL DISASSEMBLY This paragraph describes how to remove the front panel assembly from the 4284A. I n order to remove the A9, A1 0 , A1 3 , A90 , or A9 1 assembly which are shown in Figu re 3-2, first d is­...
  • Page 64 3-8-7. A1 3 ASSEMBLY REMOVAL First remove the front panel assembly from the 4284A as described in paragraph 3-8-4. 1 . Remove four screws that secure the shield case on which the WARNING is printed. 2. Remove the screw that secure the A1 3 assem bly to the back of the shield case.
  • Page 65 AI O A9 1 Figure 3-2. A9, A1 0, A1 3, A90 , or A91 Assembly Removal 3-20...
  • Page 66 The HP 4284A is composed of five block sections: power supply block section, digital con­ trol block sectio n , source block section, transducer (TR D) block section, and vector ratio detector (VRD) section.
  • Page 67 Table 3-1 0. Relationship between the DCV from A1 and Each Assembly Cooling POWER SUPPLY +5 V +8 V . ±12 V ±15 V -21 V ±48 V ±12V FAN 3-22...
  • Page 68 3· 9·2. DIGITAL CONTROL BLOCK SECTION The digital control functional group consists of the following boards. Digital Control (CPU) Keyboard A 1 0 M emory Card Interface H P- I B I nterface H andler I nterface (Option 201 ) H andler I nterface (Option 202) Scanner I nterface (Option 301 ) Bias Current Interface (Option 002)
  • Page 69 The A20 HP- I B interface board controls the handshake between the micropocessor and external HP-I B controller. A30/A31 Handler Interface (Option 2 0 1 /202) The A30/A3 1 handler interface board interfaces between the H P 4284A and the external handler. A40 Scanner Interface (Option 301 ) The A40 scanner interface board interfaces between the H P 4284A and the external scanner.
  • Page 70 The digital sinewave is filtered by the LPF, and the filtered sine wave is input to the D-A converter (DAC) as a voltage reference. So the 4284A covers various test signals with a high resolution by using both the DAC and the attenuator.
  • Page 71 A5 board . The added sig nal is amplified 1 0) , and is output to the Hcur Terminal. I n the case of t he 4284A with t h e Option 001 , you can select the high power m ode (ON/O FF) which swiches two relays.
  • Page 72 3-9-4. TRANSDUCER BLOCK SECTION The HP 4284A employees the current-to-votlage coverter as a ammeter. See Fig u re 3-7. The current through the OUT is detected by a current-to-voltage (I-V) converter using a resis­ tor (Range resistor, R R) in the feedback circuit. The I-V converter generates a cu rrent flow through the range resistor equal to the current through the OUT.
  • Page 73 The auto barance bridge circuitly used in the 4284A ensures that the vector voltage across the feedback resistor will be an accurate proportional representation of the c urrent through the device under test. The basic principle of the auto-balance-bridge circuit is explained in terms of the two oscillator model illustrated in Figure 3-8.
  • Page 74 The actual auto balance bridge circuit is composed of the A2 modulator and A3 range resis­ tor boards . The auto balance bridge consists of a null detector, a vector generator, and a feedback resistor (range resistor). The null detector consists of a cu rrent-to-voltage (I-V) converter, a phase detector, and an integrator.
  • Page 75 3-9-5. VECTOR RATIO DETECTOR SECTION The vector ratio detector is the A6 board , and it consists of the phase sensitive detector, the d etection phase generator, and the A-D (Analog-to-digital) converter. The phase sensitive detector detects the ERR voltage and the E DUT voltage using 0 0 and 90 0 reference s ignals from the detection phase generator, and outputs the 0 0 components of the E R R and E D UT voltages and the 90 0 components of the E R R and E DUT voltages.
  • Page 76 A N A LOG S E CT I O N B LO C K D I AG RAM (ST D) E C TOR RAT 10 A5 S I G N A L SO U RC E Quasi - S i n e - Wave Generator 19.2�Hl Process...
  • Page 77 A N A LO G S E CT I O N B LOCK D I AG RA M (O PT. 0 01) A 4 H I GH POWE R AM P L l F I E R / D C B I A S D C B IAS MONITOR Termlnol Channel...
  • Page 78 (2) self test selected with softkeys , and (3) self test selected by a bit switch . ( 1 ) Power o n self test Every time the 4284A is turned on it performs a power-on self test as part of the power on sequence. The 4284A performs the following self tests at power-on .
  • Page 79 Also Every time the H P 4284A turned on, the power on sequence (for example, i nitial­ izes the timer on A7) is performed. This power on sequence is checked by watching the LED array (A7 DS3, A7DS4). See below.
  • Page 81 File N ame: There are two files in Table 3-1 3 are stored in the faulty board isolation program disc. Table 3-1 3 . File Name Description File Name SVC 4284A Trouble I solation Main Program H P ADRS H P- I B Address Data 3-38...
  • Page 83 5. Press the controller's 'NextStep' softkey. The H P- I S address list will be dis­ played on the controller's screen. 6 . Set the 4284A's H P-IS address and 3458A's H P- I S address using the proper controller softkeys, and press the controller's 'NextStep' softke y . If you don't get the 4284A's H P-IS address due to a problem with the 4284A, press the ' Next­...
  • Page 84 MA I N MENU f l : Auto Sequence Troubl e I s ol at i on ( f2 to f6 ) f2 : Power S u � p l y Troubl e I s ol at i on f4 : Source Group Troubl e I s o l at i on fS : Vector Rat i o Detector Troubl e I s o l at i on f6 : Transducer Troub l e I sol a t i o n fS : Ex i t t h i s program...
  • Page 85 Table 3-1 4. Main Menu Softkeys Softkey Description f1 : 'Auto' Used to check all groups, and to isolate the faulty board. The checking order is shown in Figure 3- 1 3 . Used to check the power supply group, and to isolate the faulty board in 'Power' the power supply g roup.
  • Page 86 NOTE You can only select the 'TRD' soft key after you have checked the other groups. 3-43...
  • Page 87 NOTES 3-44...
  • Page 88 The troubleshooting aids provide information to help you troubleshoot problems in the HP 4284A. Usually the troubleshooting aids consists of a list of jumpers, a l ist of test points, and troubleshooting information. The j umper list shows the strapping config uration for each jumper.
  • Page 89 4-4. BOAR D CONNECTOR PIN ASSIGNMENT The pin assignments for each board are provided with the component locations using the names listed in Table 4-1 . Table 4-1 . Signal Name Used for Pin Assi g nments Name Description Clock signal for A-D converter Address bus lines A 20 / A CSO...
  • Page 90 4-5. R E PLACEABLE PARTS LIST The replaceable parts list provides information about the replaceable parts. 4-5-1 . ABBREVIATIONS Table 4-2 lists the abbreviations used throughout this manual. In some cases, three forms of the same abbreviation are used: all upper case, all lower case, and mixed upper and lower case.
  • Page 91 4-5-2. REPLACEABLE PARTS LISTS Table 4-3 lists the names and addresses of the manufacturers identified by M fr. Code in the parts lists . I n most cases the information given for each part includes the following information: HP part number. 2 .
  • Page 92 4-5-3. ORDERING INFO RMATION When ordering a replacement part listed in the Replaceable Parts List, specify the Hewlett­ Packard part number and the q uantity required, and send the order to the nearest Hewlett­ Packard office. When orderi n g a part not listed on the Replaceable Parts List, state the full i nstrument model num ber and serial n umber, d escribe the function of the part, and give the q uantity requ ired.
  • Page 93 1 0 00 D A N G EROUS VOLTAGE, EXCEEDS VOLTS Knob control Screwdriver adjustment Circuit assembly boarderline Asterisk denotes a factory selected value. Value shown is typical, part may be omitted. Bead inductance. Circuit board pa ttern inductance Heavy line indicates main signal path. Heavy dashed line indicates main feedback path.
  • Page 94 4-8. A 1 POWER SUPPlY SERVICE SHEET 4-8-1 . CIRCUIT DESCRIPTION The A1 Power Sup ply board provides +5 V, +8 V, ± 1 2 V, ± 1 5 V, -2 1 V, and ±48 V to the A 1 1 M other Board.
  • Page 95 [ Slow Start Circuit ] The slow start circuit, composed of A1 01 , A1 02, A1 03, A 1 09, and A1 0 1 0, lengthens the rise time of the supply voltage by limiting the maximum switching pulse width at power u p. When the voltage from the primary rectifier becomes g reater than about 240 V, th e slow start circuit is enabled.
  • Page 96 Table 4-4 shows the troubleshooting waveforms, and Table 4-5 lists the DC output voltage at each test point. DISCONNECT THE POWER CABLE BEFORE WATCH I N G THE BELOW WAVEFORMS HP 4284A Setup: 1 . Disconnect the power cable. 2. Remove the A1 board .
  • Page 97 Table 4-5. Ai DC Voltage and Test Points Test Point Name Actual DC Voltage AHP 1 3 -1 5V -1 6.5 V ±O.7 V AHP 1 4 +1 5V +1 6 .5 V ±O.7 V AHP1 5 -1 2V -1 2.5 V ±O.5 V AHP1 6 +5.2 V ±...
  • Page 98 Table 4-6 . A1 Power Supply Replaceable Parts List ( 1 /5 ) Reference HP Part Qty. Description Mfr Part Number Designator Number Code 0 4 2 8 4 · 66 5 0 1 P O W E R S U P P L Y 2 8 4 8 0 0 4 2 8 4 - 66 5 0 1 A 1 C 1...
  • Page 99 Table 4-6. A 1 Power S upply Replaceable Parts List 2/5 ) Reference HP Part Qty. Description Mfr Part Number Designator Number Code A 1 C R 6 1 90 1 · 0 0 5 0 D I OD E - S W I T C H I N G 8 0 V 2 0 0MA 2 N S D O · 3 5 9 N 1 7 1 1 N 4 1 5 0 A 1 C R 7...
  • Page 100 Table 4-6. A1 Power Supply Replaceable Parts List 3/5 ) Reference HP Part Oty. Description Mfr Part Number Designator Number Code A 1 F l 2 1 1 0 · 0 0 1 4 F U S E 4A 2 5 0V T D 1 . 2 5 X . 2 5 U L 75 9 1 5 3 1 3 0 04 A 1 F 2...
  • Page 101 Table 4 A1 Power Supply Replaceable Parts List 4/5 ) Reference HP Part Qty_ Description Mfr Part Number Designator Number Code A 1 R 2 1 0698 - 0 084 R E S I S T OR 2 _ 1 5 K 1 % _ 1 2 5 14 F T C = 0 + - 1 0 0 2 4 5 4 6 C T 4 - 1 / 8 - T O - 2 1 5 1 - F A 1 R 2 2...
  • Page 102 Table 4-6. A 1 Power Supply Replaceable Parts List 5/5 ) Reference HP Part Qty. Description Mfr Part Number Designator Number Code A l R 78 0698 · 0 082 R E S I S T OR 464 1 % . 1 2 5 W F T C = 0 + - 1 0 0 2 4 5 4 6 C T 4 - 1 / 8 - T O - 4 64 0 - F 0698 - 0 082...
  • Page 103 TP I3 lP" O S t D S 2 TPIS TPI2 1'1' :;:; � @ @ @ � <U � TPo o TPI ? TPI. O ;;!I:! CR'. CR,' CR.. CR •• � �� � ci!!> 1 'i' � � � •...
  • Page 104 P O W E R S U P PLY PRIMARY __ _ I " " " - - - � C R39 P" C l ' 4 (, 4 1( ( 4 1 3300 1'!74 1'I'3� CR�I P" 4641( .. Z (1'130 I ""...
  • Page 105 4-9. A2 MODULATOR SERVICE SHEET The A2 modulator board is covered by the exchange assembly program. The part n umber of the A2 rebuilt exchange board is listed in Table 4-A2-1 . A2 Modulator Replaceable Parts List. Table 4-A2-1 . A2 Modulator Replaceable Parts List Reference HP Part aty.
  • Page 106 These troubleshooting aids provide a list of jumpers and test points. The j u m pers are listed in Table 4-A2-2 , and the test pOints are listed in Table 4-A2-3. The test point locations are shown in Figure 4-A2-1 . Table 4-A2-2.
  • Page 107 + -1 U'1 -0 c -l Z -0 )::= >< -1 W -0 Z -I C -0 r- U'1 co -0 + -1 ..co -0 0 -1 Cl -0 rn CO 0 -1 Cl -0 rn 1.0 (j") 3: -1 0 -0...
  • Page 108 NOTES 4-A2-4...
  • Page 109 4284A is different from the part number of the A3 board for an Option 001 HP 4284A. The part number of the A3 rebuilt exchange board is listed i n Table 4-A3-1 . Table 4-A3-1 . A3 Range Resistor Replaceable Parts List...
  • Page 110 These troubleshooting aids provide a list of test pOi nts. The A3 board test point locations for the standard 4284As are shown in Figure 4-A3-1 , and the A3 board test point locations for Option 001 4284As are shown in Figure 4-A3-2 . Table 4-A3-2.
  • Page 111 4 : Serv i ce Sheets \tf- T P 1 T P 7 T P 9 T P 3 T P4 T P 5 E RR G N O G N O -17>1 2 - 1 2 �---- � ® T P 6 €!9 �.
  • Page 112 T P 1 T P 2 T P 9 T P 7 T P 8 .,.. G N O - 1 2 +1 2 IDij1 _ _ � � 3.S<> C205U� ... T P 6 ..� § I E OUT O2'S :;:;...
  • Page 113 4-1 1 . A4 H I G H POWER AMPLIFI ER/DC BIAS SERVICE SHEET The A4 board is covered by the exchange assembly program. The part number of an A4 rebuilt exchange board is listed in Table 4-A4-1 . Table 4-A4- 1 . A4 H ig h Power Amplifier/DC Bias Replaceable Parts List Reference HP Part Qty.
  • Page 114 These troubleshooting aids provide a list of test pOints in Table 4-A4-2. The A4 high power amplifier/DC bias board test point locations are shown in Fig u re 4-A4-1 . Table 4-A4-2 . A4 Test Points List Test Point Signal Name Description AC Voltage sig nal from the A5 board A4TP1...
  • Page 115 4 : Se r v i ce Shee t s :;::; T P 7 T P 5 T P l T P 2 T P 3 T P4 T P 1 5 - 5 0 G N D V I N +8 G N D VOUT ..
  • Page 116 NOTES 4-A4-4...
  • Page 117 4-1 2. AS S IGNAL SOURCE SERVICE SHEET The A5 signal source board is covered by the exchange assembly program . The part num­ ber of an A5 rebuilt exchange board is listed in Table 4-A5-1 . Table 4-A5-1 . A5 Replaceable Parts List Reference HP Part Qty.
  • Page 119 4 : Se r v i ce Shee t s T P l l T P4 TP8 TP 1 4 T P 7 T P 1 2 T P 1 0 +5A GlI 2 4 0 .., T P 1 3 9 0 I N If lf T P 6...
  • Page 120 NOTES 4-A5-4...
  • Page 121 4-1 3. AS VECTOR RATIO DETECTOR SERVICE SHEET The A6 vector ratio detector board is covered by the exchange assembly program. The part n u m ber of an A6 rebuilt exchange board is listed in Table 4-A6-1 . Table 4-A6-1 . 6 Replaceable Parts List Reference HP Part Qty.
  • Page 122 Table 4-A6-3. A6 Test Points List Description Test Point Signal Name Crystal oscillator signal A6TP1 Ground Line A6TP2 I ntegration time signal A6TP3 End of measurement signal A6TP4 I nput signal to the phase detector A6TP5 I nput signal to the A-D converter A6TP6 A6TP7 G round Line...
  • Page 123 o iil! o � R6S � ®l ..<: -l ""'0 Z --' � ..-l -l ""'0 ""'0 -l Cl ""'0 �R32� � R31 � ..Z -l -l ""'0 rrl co Ci'l --' ""'0 <..0 + -l N --' --' ""'0...
  • Page 124 NOTES 4-A6-4...
  • Page 126 4-1 4-2. TROUBLESHOOTING AIDS Since the A7 board has been set up under the exchange program, when the A7 board is defective, you replace the A7 board. The board isolation procedure is g iven in SECTION 3. 4-1 4-3. REPLACEABLE PARTS LIST The replaceable parts for the A7 board are divided into two g roups: a ROMless A7 board and a set of programmed ROMs.
  • Page 127 Table 4-A7 -2. A7 Digital Control Replaceable Parts Lists Reference HP Part Qty. Description Mfr Part Number Designator Number Code 042 84 · 66 6 5 7 D I G I T A L C O N T R O L W I O R O M 8480 0 4 2 84 ·...
  • Page 128 ::> 1J) -i -..,J 0 -' Figure 4-A7 -1 . A7 Digital Control Component Locations 4-A7-4...
  • Page 129 A91 LCD module board . The A91 LCD module is the HP 4284A' s display screen. 4-1 5-2. TROUBLESHOOTING AIDS Fuse A9F1 for the A90 board and is located on the A9 Keyboard. If the H P 4284A display screen isn't active, check fuse A9F1 first.
  • Page 130 Table 4-A9JA1 3JA90JA9 1 - 1 . A9 Keyboard Replaceable Parts List Reference HP Part aty. Description Mfr Part Number Designator Number Code 04279 - 665 59 K E Y BOARD 28480 04279 - 665 59 A 9 C 1 0 1 8 0 - 0 1 97 CAPAC I T O R - FXD 2 _ 2U F + - 1 0% 20VD C T A 56289...
  • Page 131 Table 4-A9/A 1 3/A90/A9 1 -2 . A 1 3 DC-AC Converter Replaceable Parts List Reference HP Part Qty. Description Mfr Part Number Designator Number Code A1 3 A 1 3 04278 - 665 1 3 D C - A C CONVE R T E R 28480 04278 - 665 l3 A 1 3 C 1...
  • Page 132 Table 4-A9JA 1 3JA90JA9 1 -3. A90 and A91 Boards Replaceable Parts List Reference HP Part Qty. Description Mfr Part Number Designator Number Code K E Y BOA R D / D I S P LA Y CONT ROL 28480 04278 - 66590 0 4 2 78 - 66590 L CD MOD U L E...
  • Page 133 N OTES 4-A9jA1 3jA90jA9 1 -5...
  • Page 134 JIB!) !A.�2§_llq-2.iUl .Y§-';X2 ,«,O_q-2 '§_'t ! � !A.q2§.A.q-§ §]�.Y§_ O _ � 2 1 _ o _ �§§" � O QD o G- R4 -E1 ® G- RS -EI G- R6 -E1 G- R7 -El ® ® G- RI -El G- R2 -E1 �...
  • Page 135 1 - - A 9 0 K E Y B O A R D / D I S P L A Y C O N T R O L M O D U L E K E Y B OA R D W2- 6 SC D wl - 6...
  • Page 136 4-1 6. A1 0 MEMORY CARD INTERFACE SE RVICE SHEET 4-1 6-1 . CIRCUIT DESCRIPTION The A1 0 M emory card IIF board contains only connectors for the A7 C P U board and the M emory Card. 4- 1 6-2. TROUBLESHOOTING AIDS N o troubleshooting d ata is g iven for the A1 0 Memory Card IIF board .
  • Page 137 Table 4-A 1 0-1 . A 1 0 Memory Card Replaceable Parts Lists HP Part Reference Mfr Part Nu mber Description Code Designation Number A 1 0 28480 0 4 278-665 1 0 HEM CARD SOCKET 0 4 278-665 1 0 16299 CAC02Z5U 1 0 4 M O S O A CAPACITOR-FXD...
  • Page 138 � � � � � = � � � � � � � � � � � � - o [!;!] o A 1 0X2 +5v _HEM_CARD A 1 0 A 1 1 • CARD_RU /CARD_LDS • HEM_CARD " • •...
  • Page 139 NOTES 4·A1 0·4...
  • Page 140 4-1 7. A1 1 MOTHE R BOAR D SE RVICE SHEET 4- 1 7-1 . C I RCUIT DESCRIPTION The A 1 1 M otherboard is the common bus for all other boards. 4-1 7-2. TROUBLESHOOTING AIDS N o troubleshooting d ata is g iven for the A 1 1 Motherboard. The pin assign ments on the A 1 1 circuit side gives the information needed for troubleshooting, see Figure 4-A 1 1 -1 .
  • Page 141 Table 4-A 1 1 -1 . A 1 1 Motherboard Replaceable Parts List Reference HP Part Oty. Description Mfr Part Number Designator Number Code A1 1 A 1 1 M O T H E R BO A R D A 1 1 0 4 2 84 - 665 1 1 0 4 2 84 - 665 1 1 CON N E C T O R 3 ·...
  • Page 142 0000000000000000000000000000000 � '" aoooao OOO.OOOo.ooooaoooo aoooo.OO 000. 000.0000.0000.0000.0000.00 00000000000000000000000000000000 00000000000000000000000000000000 aooo.OOOO.OOOO.OOO 0.000 0.0000.00 .000 0000.0000.0000.0000.0000.00 00000000000000000000000000 .000.0000.0000.0000.0000.0000.00 000000000000000000000000 '" 00000000000000000000000000000000 .000.0000.0000.0000.0000.0000.00 0.0000.0000.0000.00 000000000000000000000000 00000000000000000000000000000000 .000.0000aooooaoooo.0000.0000aoo 0 0 0 0 .0000.0000.0000.00 � 00000000000000000000000000000000 00000000000000000000000000000000 aooo.ooooao 00 oaoooo.OO 00.00 00.0 0 0 0 0 0 0 0 0 000 .0000.0000.0000.00 000000000000000000000000 00000000000000000000000000000000...
  • Page 143 J2 J1 X1 0 X1 2 Figure 4-A 1 1 -1 . Pin Assginment on the A Circuit Side 4·A1 1 ·4...
  • Page 144 � P I N A S S I G N M E N TS O N T H E A11 C I RCU I T S I D E m � - > - > z N Z N < n < 1 ;...
  • Page 145 4-1 8. A20 H P-IB INTER FACE SE RVICE SHEET 4-1 8- 1 . CI RCU IT DESCRIPTION The A20 H P- I B I nterface board hand les all H P- I B interface functions. The H P- I B I nterface board controls the handshaking between the M icroprocessor and external H P- I B controlled equipment.
  • Page 146 Table 4-A20-2. A20 HP- IS I nterface Replaceable Parts List HP Part Reference aty. Description Mfr Part Number Designator Number Code 0 4 2 84 · 66 5 2 0 H P - I B I F A 2 0 2 8 4 8 0 0 4 284 - 66 5 2 0 0 1 8 0 - 35 9 0...
  • Page 147 NOTES 4- A2 0-3...
  • Page 149 A 2 0 HP-IB INTERFACE LSIG4 0101 J 1 A 2 J 1 A 3 J1A 4 11AL5e4 7 S I GSA J 1 8 1 " J 1 8 2 DIO I S ' 1 1 X 1 S 27 "...
  • Page 150 A30W1 through A30W1 1 ) are set according to the pull up voltages used. For more detail information about the i n put/output signals and jumpers, refer to the handler interface opera­ tion note in the HP 4284A operation manual. [ Peripheral Interface Adapters ] A30 U 1 3 and A30 U 1 4 are peripheral i nterface adapters ( PIAs ) which interface between the A7 CPU board and the A30 board.
  • Page 151 Table 3-1 . A30 Handler I nterface Replaceable Parts List Reference HP Part Qty. Description Mfr Part Number Designator Number Code A 3 0 0 4 2 7 8 · 6 6 5 3 0 H A N D L E R I F ( O P T I O N 2 0 1 ) 2 8 4 8 0 0 4 2 7 8 - 6 6 5 3 0 0 1 8 0 - 3 6 0 2...
  • Page 153 Q» G- OIO -e G-OEII -e -<> <>- 1 1 lI -<> <>-'" G- EO -e G- all -e G- tll -e G-9tll -e G- 0 III -e G- LII -e G-Stll -e G- 611 -e ®� G- 911 -e G- SII -e G- 11I -e :;:::;...
  • Page 154 A 3 0 # 2 0 1 HA N D L E R I N T E R F A C E - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -...
  • Page 155 4-20. A31 HANDLER I NTERFACE (OPT.202) SERVICE SHEET 4-20-1 . CIRCUIT DESCRIPTION The A3 1 handler interface board consists of photo couplers, and peripheral interface adapt­ ers (P IAs). [ Photo Couplers ] Photo couplers A3 1 U1 through A3 1 U 1 4 opto-isolate the i n put and output signals. Then timing of the input/output signals is determined by setting j umpers A3 1 W3 through A3 1 W1 3 .
  • Page 156 Table 4-A31 -2 . A3 1 Handler Interface Replaceable Parts List (1 /2) Reference HP Part aty. Description Mfr Part Number Designator Number Code A 3 1 0 4 2 78 · 66 5 3 1 H A N D L E R ( OP T I ON 2 0 2 ) 2 8 4 8 0 0 4 2 78 - 66 5 3 1...
  • Page 157 Table 4-A3 1 -2 . A3 1 H andler Interface Replaceable Parts List (2/2) Reference HP Part Oty. Description Mfr Part Number Designator Number Code U 2 1 1 8 2 0 - 2 7 1 1 I C D R V R T T l l S l i N E D R V R O C T l 0 1 2 95 S N 74 l S 5 4 1 N U 2 2...
  • Page 158 @ � © :;::: -€> q> A31XIA Go to -€> A31XIB Pin No, � GoSIY -€> Go EIII -€> : : 0 LGND LGND Go DIll -€> Go tIll -€> B § , ,0 A31 J I B P i n N o , A31 J I A LGND LGND...
  • Page 159 A 3 1 # 2 0 2 H A N D L E R I N T E R F A C E ,------------------------------------------------------------------------------------------------------------------------------------------------, � �I'" " J I A J I A " - �,� • " ... , J 1 A �I"""...
  • Page 160 4-21 . A40 SCANNER I NTERFACE (OPT.301 ) SERVICE S HEET 4-2 1 - 1 . CIRCUIT DESCRI PTION The A40 scanner interface board consists of photo couplers, EEPROMs, Static RAMs, and a peripheral interface adapter ( PIA ) [ Photo Couplers ] When the scanner interface connector on the rear panel is used to synchronize an external scanner, the input/output signals are opto-isolated by opto-cou plers A40U3, A40U4, A40U 5 , a n d A40U6.
  • Page 161 4-21 -3. REPLACEABLE PARTS LISTS The replaceable parts for the A40 Scanner I nterface Board are l isted in Table 4-A40-2. 4-21 -4. COMPONENT LOCATIONS The component locations on the A40 scanner interface board and the board connector pin assignments are shown in Figure 4-A40-1 . 4-2 1 -5.
  • Page 162 Table 4-A40-2 . A40 Scanner I nterface Replaceable Parts list (1 /2) Reference HP Part Qty. Description Mfr Part Number Designator Number Code A 4 0 0 4 2 78 - 66 5 4 0 S CA N N E R I N T E R F A C E ( OP T I ON 3 0 1 ) 28480 0 4 2 78 - 66 5 4 0 0 1 8 0 - 33 6 3...
  • Page 163 Table 4-A40-2. A40 Scanner I nterface Replaceable Parts list (2/2) Reference HP Part Qty. Description Mfr Part Number Designator Number Code U 1 1 1 8 2 0 · 1 1 1 2 I C F F T T L L S O · T Y P E P O S · E O G E - T R I G 0 1 295 S N 7 4 L S 74 A N U 1 2...
  • Page 164 NOTES 4-A40-5...
  • Page 165 Q» o�o CllBlo 6) 0 o [El £I :;::; £I P i n No..J I l a lGNO lGND LGHD LGNO olElo olElo lGNO LGNO G- Itll -€) G-otll -€) G-6111 -€) A 1 5 A 1 4 A 1 2 A l l G-8 111 -€) A I D...
  • Page 166 A40 SCANNER INTERFACE 0 1 0 · ' 5 1 0 1 0 1 " O f I I u 1 4 0 ( 2 ) 0 ( 3) A l l : 1 5 1 BO C l ' I 2 1 8 DI 1 4 ) 1 4 0 ( 4 1 "...
  • Page 168 A40 SCANNER INTERFACE BA i l ' 1 5 ) BA l l : I S ) B O I O : l S ) BO I O : 1 5 ) BA I l ) BA l l ) , "...
  • Page 169 This appendix contains t h e information req uired to adapt this manual t o earlier versions or configurations o f t h e H P 4284A than the current printing date of this manual. T h e informa­ tion in this manual applies d irectly to HP 4284A Precision LCR M eters whose serial n umber prefix is listed on the title page of this manual.
  • Page 170 NOTES...
  • Page 171 REGIONAL SALES AND SUPPORT OFFICES For more in f ormation about Agilent Technologies test and measurement products, a pplications, services, and f or a current sales o ffice listing, visit our web site: http:/ /www. agilent. coml f ind ltmdir. Y ou can also contact one o fthef ollowing centers and askf or a test and measurement sales re presentative.
  • Page 173 Artisan Technology Group is your source for quality new and certified-used/pre-owned equipment SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT • FAST SHIPPING AND DELIVERY Experienced engineers and technicians on staff Sell your excess, underutilized, and idle used equipment at our full-service, in-house repair center We also offer credit for buy-backs and trade-ins •...

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