Benutzeranleitung / Produktwartung AGILENT MODELS 6023A and 6028A des Produzenten Agilent Technologies
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SERVICE MANUAL AUTORANGING DC POWER SUPPLY A GI LENT M O DELS 6023A and 6028A A gilent Part No. 596 4-828 3 FOR INSTRUMENTS WITH SERIAL NUMBERS Agilent M odel 6023A; Serials US36490 101 and above Agilent M odel 6028A; Serials US36520 101 and above For instrument s w ith higher serial number s, a ch ange pag e may be i nclude d.
2 CERTIFICATION Agilent Technologies certifies that this pr oduct met its published specifications at time of shipment fr om the factory. Agilent Technologies further certifies that its calibration me.
3 SAFETY SUMMARY The followi ng gener al safe ty prec autions m ust be o bserved during all phases of operation, servi ce and repair of this instrument. F ailure to comply w ith th ese precau tions or with specific w arnings els ewhere in this manual viol ates safet y standards of design , manufa cture, and i ntended use of the instrum ent.
4 SAFETY SYM BOL DEFINITIONS Symbol Description Symbol Description Direct current Terminal for L ine conductor on perm a nently installed equip ment Alternating current Caution, risk of electric shock.
5 TABLE OF CONTENTS Introduction ............................................................................................................................................................................ 7 Scope .....................................
6 Overvoltage Protection (OVP) Circui t........................................................................................... ................................. 49 Power- Limit Comparator ...........................................................
7 1 Introduction Scope This m anual cont ains inf ormation for troubl eshoot ing the Agi lent 6023A or 6028A 200W Autoranging Powe r Supply to th e component level. Wherever applicable, the service instruction s given in this manual refer to pertinent information provided in th e Operation Manual.
8 Manual Revisions Agilent Technologies instrume nts are identified by a 10-digit serial number. T he format is described as follows: first two letters indicate the country of manufacture. The next four digits are a code that identify e ither the date of m anufacture or of a significant des ign change.
9 2 Calibration and V erifica tion Introduction This section provides test a nd calibration procedures. T he operation-verification tests co m prise a short pr ocedure to verify that the un it is perf orming properly , without tes ting all s pecified paramet ers.
10 Table 2- 1. Test Equ ipment R equired TYPE REQUIRED CH ARACTERIST ICS USE RECOMM ENDED MO DEL Oscilloscope Sensitivity: 1 mV Bandw idth: 20MHz & 100MHz Input: differential, 50 Ω & 10M Ω P,T Agilen t 1740A RMS Voltm eter T rue rm s, 10MHz bandwidth Sensitivity: 1 mV A ccu ra cy : 5% P Agil ent 3400B Logi c Pulser 4.
11 Table 2-1. Test Equipment Required (continue d) TYPE REQUIRED CH ARACTERIST ICS USE RECOMM ENDED MO DEL Swi tch SPST, 30A @ 20V P DC Pow er Su pply Voltag e range: 0-60Vdc Current range: 0- 3Adc T,.
12 Table 2-2. Calibration Procedure TEST T ESTED VA RIA B LE TEST POINT S TEST SEQUENC E AND ADJUSTM ENTS EXPECT ED RESULTS Meter F/S Adj ust . Meter Ref. Voltage A2J3 pin 6 ( + ) M ( - ) a. Connect D VM across t est point s and tu rn on ac pow er. b.
13 Table 2-2. Calibration Procedure (continued) TEST T ESTED VA RIA B LE TEST POINT S TEST SEQUENC E AND ADJUSTM ENTS EXPECT ED RESULTS Pow er Limi t Adj ust . V(OUT) I(OUT) a. Perform I-MON F/S Adjust before proceeding. b. Connect the unit to the ac po w er line via the external variable auto -transf ormer which is set to no minal l ine vo lta ge.
14 Table 2- 3. Guide to R ecalibrati on Afte r Repair Printed Circuit Board Block Name Circuit Within Block Ref. Designator Perform T hese Procedures* A1 M ai n Bo ar d R3 4 A1 Main Board T 1 4 then 5.
15 The substitution of the load resistor requires adding a load switch to open and short the load in t he CC or CV load regulation tes ts. The load transient recov ery time test procedu re cannot be perf ormed us ing load resistors . An electronic load is considerably eas ier to use than a load resis tor.
16 Figure 2-3 . Basic T est Setup d. Reduce the res istance of the load to draw an output curren t of: 29Adc (602 3A) 10Adc (602 8A) Check that the unit's CV LED remains lighted. e. Record the output voltage at the digital voltmeter. f. Open-circuit the load.
17 f. Record the output voltage at the digital volt meter. g. Adjust autotransfor mer to the maximum for your line voltage. h. When the reading settles record the output voltage again. Check that the two recorded readings differ no more than: ± 0.0030Vdc (6023A ) ± 0.
18 the unit's output voltage. T o reduce comm on-mode noise pic kup, set up the oscilloscope for a differential, two-ch annel voltage measurement. To reduce norm al-mo de noise pickup, us e twisted, 1 m eter or shorter, 50 Ω coax ial cables with shields connected to the oscillosco pe case and to each other at the other ends.
19 6023A 6028 A Figure 2-6 . 20KHz Nois e, CV Peak- to-Peak P ARD Load Tr ansient Recovery T im e . Specified for CV operation only; load trans ient recovery tim e is the time for the output voltage to return to within a specified band aro und its set voltage follo wing a step change in load.
20 6023A 6028 A Figure 2-7. Load T ransient R ecovery W aveform Temperatu re Coefficient. (6023A) Temperatu re coefficient (TC) is the change in ou tput voltage for each ° C chang e i n ambient temperature with constant ac line volta ge, constant output voltage setting and consta nt load resistance.
21 Constant Current (CC) Tests CC Setup. Co nstant-current tests are analogous to constant-voltage test s, with the unit's output short circuited and t he voltage set to full output to assure C C operation. Follo w the general setup instructions.
22 0.25 Ω (6023A ) 2.0 Ω (6028A ) load resistor th at is capable of s afely dissipating 250 watts. Proceed as follow s: a. Connect the test equ ipment as shown in Figure 2- 8. b. Switch the unit's po w er on and turn the output voltage all t he way up.
23 3 T rouble shooting Maintenan ce described h erein is performed w ith powe r supplied t o the ins trument, an d protectiv e covers removed. S uch main tenance should be perf ormed on ly by service- trained personne l who are aw are of the hazards involved (f or example, fire an d electrical shock).
24 Table 3- 1. Control Bo ard Test Co nnector, A2J7 PIN NO. SIGNAL NA M E Vdc WAVEFORM/CONDIT IONS SOURC E Digital-Circuits Bias & Reference Voltages 1 +5V 5.0 A2Q3 (em it ter) 22 + 20V(5V UNR EG) 20.0 with 120Hz & 45KH z ripple A1CR 6, A1CR7 14 2.
25 Electrostati c Protection The following caution outlines important precautions w hich should be observed w hen work ing with static sensitive com ponents in the pow er supply . Thi s instr ument uses co mponen ts whi ch ca n be da maged by stat ic cha rge.
26 To avoid the possibility of personal injury, remove the power supply from operation before opening the cabinet. Turn of f ac powe r and disconne ct the line cord, load, and rem o te sense leads before attempting any repair or replacem e nt.
27 A 4 Power Mesh Board Remov a l After rem o ving the i nside cove r, remove the A4 power m esh board by lifting, using the larg e aluminum h eatsink as a handle. Two connectors hold the A4 board at its botto m edge. When ins talling the A4 power m esh board, low er it vertically into its conn ectors and pres s in place.
28 Table 3-1 giv es th e signals for each of the test poin ts on the control board test connector. This con nector is prov ided in service ki t P/N 06033- 60005. The m easurements given h ere inclu de bias and ref erence vol tages as well as power su pply status si gnals a nd wave for m informatio n.
29 Main Troubleshooting Setup Figure 3-1 shows the troubleshootin g setup for troubleshooting all of the unit except the front-panel and initial no output failures (See pag e 31). The extern al power supply provides the un it's internal bus v oltage.
30 As a convenience in implementing the trou bleshooting setup, prepare co rd sets as s hown in Figure 3- 2. This facilitates connecting the unit's input pow er receptacle to the external supply and connecting the bias transformer to th e ac mains.
31 d. With the LINE sw itch off, connect an external dc s upply to th e outside prongs of the unit’s pow er receptacle. Ignore polarity as the unit’s input rectifying diodes s teer the dc pow er to the correct nodes .
32 Table 3-2. No-Output Failures (Bias supplies and AC turn-on circ uit functioning) Status of PFET on/off-Puls es PWM -ON A2J7-26 PWM -OF F A2J7-25 DEFECTIVE BOARD CHECK FUNCT IONAL CIRCUITS lo lo A .
33 Troubleshooting Bias Supplies +5V on A2 Contro l Board . The PWM A 2U6 includes a clock generator (45KHz set by A2R 53 and A2C26), an d a current limit (2Adc set by 0.15Vdc acros s A 2R50). It turn s off each output pu lse using the differen ce between the voltag e at voltag e divider A 2 R46- A2R47 and t he 2.
34 Table 3 5. Performance Failure Symptoms (continued) S YMP TO MS D E FE CTI VE BOARD CHECK FUNCT IONAL CIRCUITS CV ov ershoots A2 A2U 10A, A 2CR20, A 2R94 Output n oise ( < 1KH z) A 2, A1 CV Circ.
35 Input: NODE ( + ) ME A SUREMENT SOURCE A2U4 (IN ), A2C 16 (-) ≈ -24Vdc A1U 1, AlC 1 ( + ) Outputs: NODE ( + ) N0DE ( - ) MEASUREMENT A2U4 (A DJ) A2U4 (OUT) 1.25Vdc A2VR2 (cath .) A2VR2 (an ode) 11.7Vdc A2R 33, A2R 34 A2VR2 (cath.) 2.05Vdc To check if load on -15V is shorted, rem ove jumper A 2W3.
36 A2U18- 13 cycle pow er f ive 100ms pu lses then hi A2U18- 12 cycle pow er tw o 200 ms pulses th en hi A2U18-15 cy cle power tran sition lo to hi at 800 m sec A2U17-8 cycle power trans ition lo to hi at 1.0 sec A2U17-11 cycle power transition lo to hi at 1.
37 + OUT 40 10 3.8V dc (OVERR A NGE) + OUT 40 2 2.0Vdc (CV) + OUT 40 2 short A2J3-4 to A2J 3- 8 0.0Vdc Troubleshooting DC-To-DC Converter Parallel NOR gates A4U2 A, A4U2B and A4U1A act as drivers and s witch on FETs A4Q3 and A4Q4 through pulse trans for mer A4T 1.
38 Troubleshooting CV Circuit V-MON , the ou tput of CV Moni tor Amp A 2U7, is 1/4 th e voltage between + S an d - S. C V Error Amp A 2U8 com pares V-MON to CV PROGRA M.
39 If the failure symptoms include output current oscillation, check if th e differentiator circuit is at fault by removing resisto r A2R16 (3.3M ohm ).
40 Figure 3-3. Wavefo rms.
41 Outputs: NODE ( - ) = A2J7-4 SET VOL TAGE (Vdc) NODE ( + ) EXTERNAL INTERNAL SETUP M EASUREMENT A2U9 (O UT) - 2.5Vdc A2U14- 10 10 1.0Vdc A2U14- 11 - 1.
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43 4 Principles of Operation A utoranging Power Autoranging allows the unit to be compact and light weight and yet to deliver a range of output voltage current combin ations which ot herwis e would requi re the use of more than one supply or a higher rated-pow er supply .
44 Figure 4-2. Block Di agram.
45 Control signals flow from right to left with separate circuits for constant-voltage, constant-current and power-limit control. These three control circuits jointly provide the Autoranging characteristic of Figure 4-lB. AC Turn-on Circuits limit inrush current to the input filter and assure transient free turn-on.
46 Figure 4-3. Simplified Schematic.
47 The unit checks th at the + 5Vdc bias voltage and th e ac mains voltage are within acceptable limi ts as part of its turn on sequence. When + 5Vdc comes up, the Bias Voltage Detector resets the Ove.
48 Figure 4-4. PFET Control Signals Timing Diagram Constant-Voltage (CV) Circuit The Constant-Voltage Circuit compares the output voltage to the user-set CV PROGRAM Voltage to prod uce the CV CONTROL Voltage. Two com parison amplifier loops accomplish the comparison.
49 Constant-Current (CC) Circuit The Constant-Curren t Circuit compares the output current to the user-set CC PROGRAM Voltage to produce the CC CONTROL Voltage.
50 A2CR24. The A 2R113-A2R114 vol tage divi der sets the ma ximum CP voltage to + 1.5Vdc an d assu res th at the diode w ith the lower control voltage will be forward biased when its control voltage is less t han + 1.
51 by inhibiting the PWM throug h the DROPOUT signal from the l-Second-Delay Circuit. Mains Detect signal, which is fullwave- rectified ac f rom th e + 5Vdc secondary of th e bias- supplies t ransforme r, senses th e ac mains voltag e.
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53 5 Replace able Part s Introduction This chapter contains information for orderin g replacem ent parts. Table 5-3 lists parts in alpha- nu mer ic order by reference designat ors and prov ides th e following information: a. Reference D esignators . Refer to Tabl e 5-1.
54 Ordering Information To order a replacem e nt part, address order or inqu iry to you r local Agilent Technolgies sales office. Specify th e following information for each part: Model, com plete ser.
55 Table 5- 3. A1 M ain Board Part s List Ref. Desig. A g ilent Model A g ilent Part Number Des cription ELECTRICAL PARTS Al 6023A 06038-60021 Main Board A ssem bly Al 6028A 06038-61021 Main Board A s.
56 Table 5-3. A1 Main Board Parts List (continued) Ref. Desig. A g ilent Model A g ilent Part Number Des cription R8 6028A 0699-011 8 Resisto r 20 Ω 0.1% 0.1W R9 6028A 7175-005 7 Wire tinn ed copper AWG 22 R10 6028A 0698- 635 9 Resis tor 80K Ω 0.1% 1/8W R11 All 0698- 6322 Resisto r 4K Ω 0.
57 Table 5- 4. A2 Cont rol Board Parts List Ref. Desig. A g ilent Model A g ilent Part Number Des cription ELECTRICAL PARTS A2 06038-61023 Control Board Ass embl y A2 06023-60023 Control Board Ass embl y C1 All 0160- 5469 Capacitor, l µ F + 10% 50V C2 All 0160- 5422 Capacitor, 0.
58 Table 5-4. A2 Control Board Parts List (continued) Ref. Desig. A g ilent Model A gilent Part Number Description C50 6023A 0160- 016 7 Capacitor, 0.082 µ F 10% 200V C50 6028A 0160- 016 8 Capacitor, 0.l µ F 10% 200V C51 All 0160- 480 1 Capacitor, 100 pF 5% 100V C52,53 A ll 0160-4 831 Capacitor, 4700pF 10% 100V C54 All 0160- 5422 Capacitor, 0.
59 Table 5-4. A2 Control Board Parts List (continued) Ref. Desig. A g ilent Model A gilent Part Number Description R6 All 0683- 5125 Resist or 5.1K Ω 5% 1/4 W R7 All 0683- 4745 Resist or 470K 5% 1/ .
60 Table 5-4. A2 Control Board Parts List (continued) Ref. Desig. A g ilent Model A gilent Part Number Description R48,49 A ll 0686-1 315 R esist or 130 Ω 5% 1/ 2W R50 All 0811- 3174 Resist or 0.07 Ω 5% 5W R51 All 0698- 6076 Resis tor 39K Ω 1% 1/8 W R52 All 0757- 0280 Resisto r 1K Ω 1% 1/8W R53 All 0698- 4121 Resist or 11.
61 Table 5-4. A2 Control Board Parts List (continued) Ref. Desig. A g ilent Model A gilent Part Number Description R85 All 0698- 3450 Resist or 42.2K Ω 1% 1/8W R86 All 0757- 0452 Resist or 27.4K Ω 1% 1/8W R87 All 0683- 2715 Resis tor 270 Ω 5% 1/ 8W R88,89 A ll 0683-2 225 R esistor 2.
62 Table 5-4. A2 Control Board Parts List (continued) Ref. Desig. A g ilent Model A gilent Part Number Description R139 All 0757- 044 2 Res istor 10K Ω 1% 1/ 8W R140 All 0698- 316 0 Res istor 31.6K Ω 1% 1/8W R141 All 0683- 102 5 Resisto r 1K Ω 5% 1/4W R142 All 0683- 222 5 Res istor 2.
63 Table 5- 5. A3 Front -Panel Boa rd Parts Li st Ref. Desig. A g ilent Model A gilent Part Number Description ELECTRICAL PARTS A3 6023A 06023-60020 Front-Panel Board Ass embl y A3 6028A 06028-61020 Front-Panel Board Ass embl y C1 All 0160- 4807 Capacitor, f ixed ceram ic 33pF ± 5% 100V C2-4 All 0160-5 422 C apacitor, fi xed ceram ic 0.
64 Table 5- 5. A3 Front -Panel Boa rd Parts Li st Ref. Desig. A g ilent Model A gilent Part Number Description R68 All 0698- 6362 Resist or, fix ed film 1K Ω 0.1% 1/8W R69 All 0698- 6343 Resist or, fix ed film 9K Ω 0.1% 1/8W R71 6023A 0698- 636 3 Resist or, fix ed film 40K Ω 0.
65 Tabl e 5-6. A4 Pow er M esh Parts Li st Ref. Desig. A g ilent Model A gilent Part Number Description A4 06038-61022 Power Mesh Assem bly C1 All 0160- 5891 Fix ed m et 0.47 µ F +l0% 630V C2 All 0160- 5422 Fixe d cer 0.047 µ F +20% 50V C5,6 All 0160- 496 0 Fixed film 2200pF +10% 1.
66 Tabl e 5-6. A4 Pow er M esh Parts List (contin ued) Ref. Desig. A g ilent Model A gilent Part Number De scription R24 All 0757- 046 4 Fi xed film 90.9K 1% A 1/8W R25 All 0686- 100 5 Fi xed com p. 10 5% 1/2W R26 All 0811- 249 0 Fi xed ww 0.1 3% 5W R27 All 0698- 322 5 Fi xed film 1.
67 Table 5- 7. Other Repl acement Assemblies Ref. Desig. Agilent Model A g ilent Part Number Description A1 Board M echanical Parts 6023A 1251-0600 Contact-conn M (Ref F an) A1J1 All 1251-5 927 Connec.
68 Table 5-7. Other Replacement Assemblies (continued) Ref. Desig. Agilent Model A g ilent Part Number Description All 4040- 1954 Window , displ ay 6023A 5020-8847 Trim stri p All 5041- 880 3 Trim s t.
69 6 Component Locati on and Circ uit Diagrams This chapter cont ains component location diagrams, sch ematics, and other draw i ngs useful f or maintenance of the pow er supply .
70 Table 6-1. S chematic Diag ram Notes 1. deno tes fro nt-p anel marki ng. 2. denotes rear-pan el marking. 3. Complete ref erence designator con sists of compon ent reference desi gnator prefix ed with assem bly number (e.g.: A 2R14). 4. Resist or valu es are in ohm s.
71 Table 6- 1. Schematic Diag ram Notes ( continued) Pin locati ons f or other s emi-con ductors are sh own below :.
72 Figure 6-1. Top View, T op Covers Re moved.
73 Figure 6-2. Main Board (A1) Component Location.
74 Figure 6-3. Control Board (A2) Component Location.
75 Figure 6-4. Front-Pa nel Board ( A 3) Component Location.
76 Figure 6-5. Power M esh Board (A4) Compon ent Locat ion.
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79 A System Option 002 General Information This option facilitates the operatio n of the power supply in an automated system. Four major circuit blocks provide: 1 ) remot e analog programm ing of the .
80 Table A-1. Specifications, Option 002 Remote Programming Resistance Pro gramming: 0 to 4K ohm provides 0 to m aximum rat ed voltage or current output.
81 Table A-1. Specifications, Option 002 (continued) Voltage R ange: +4.75V to 16V Current Drain: 20mA max imu m Status In dicator ou tput: Open collector outpu t: Maximum Output Voltage (logic high) : + 16V Logic Low output: + 0.4V m aximum at 8mA Remote Cont rol (Trip, Reset, In hibit) Control Is olator Bias Inpu t Voltage R ange: +4.
82 Table A-1. Specifications, Option 002 (continued) Pulse T iming Low Bias or AC DROPOUT will go false after 5V supply stabilizes. Bias Supplie s DC Output Ratings: (25 ° C ± 5) No Load to F ull L oad 104V to 12 7V lin e.
83 Installation When ins talling the board, perf orm the following st eps: a. Remove t he top an d inner cov er of the pow er supply as dis cussed in S ection 3 under R epair and R eplacem ent. b. Remove th e plate next to the barrier st rip on the rear pan el of th e supply by unscrewing the 2 M3 s crews.
84 Figure A-1. Mating Connector Assembly Operation The following paragraphs prov ide the operating ins tructions necess ary to interface a 002- equipped pow er supply into an automated system.
85 Figure A-2. 002 Option Rear Panel Connector J3 and Switches A1 and A2. Local/Remote Programming When switching to local/ control, remem ber to set Front-Panel Voltage and Current Control to safe levels.
86 Figure A -3. Accessing Loc al Programming While In Remote Programming Mode If solid state circuitry is used, conn ect the Control Is olator Bias to a driver capable of sink ing 10mA of current, th en connect the driver's output to both of the LOC/REM terminals.
87 Figure A-4. Calculating Value of Series Dropping Resistor Remote Resist ance Programm ing Check switches A1 and A2 on th e rear panel, they must be in their correct positions f or CV and CC resistance/voltage programm i ng (See F igure A- 2).
88 Figure A-5. Remote Resistance Programming Figure A-6. Voltage Programming of Output Voltage and Current.
89 Current Programming (Figure A-7). Ch eck switches A1 and A2 on th e rear panel, they must be in the correct positions for CV and CC cu rrent programm ing (S ee Figure A- 2). A cu rrent sink variable from 0 to 2 m A, can be used t o program t he output voltage or cu rrent from 0 to full s cale (See Figure A- 7).
90 Output im pedance is l0K ohm: th e monitoring device inpu t impedance sh ould be at least 1M ohm to lim it error to 1% + basic accuracy ; 10M ohm to limit error to 0.1% + basic accu racy. The I. MON si gnal from the m ainframe is als o brought out throug h the 002 Opti on board.
91 Remote Trip. A ne gati ve-goi ng edge a ppl ied t o ter minal J 3-30 ( TRIP REMOTE ) will shut down the pow er supply, reducing the output voltage to near zero. For min imum pulse duration and timing considerations with respect to RESET REMOTE , See Table A -1.
92 Figure A-8. Remote Control Power-On Preset This open collector output line J3-6, pro vides a logic low pulse ( Preset - On - Power ) to the user th at can be used to initialize or delay a system's operation until + 5V Reg. supply has stab ilized.
93 on, it causes J3-6 ( Preset - On - Power ) to be low thus, if used, can initialize or delay a customer's system operation. A C Dropout Buf fer Circuit This circuit couples, inverts and isolates the DROPOUT signal (received from th e A2 Control Board) of st atus output termin al J3-19 ( DROPOUT ).
94 If it is necessary to h ave all the supplies come up s imultaneously after a syst em shutdown, follow this procedu re: a. First bring the INHIBIT REMOTE line low. b. Provide a negativ e-going pulse to the RESET REMOTE . c. After at least one second, return INHIBIT REMOTE to a high level.
95 Troubleshooting Before attem pting to t roubleshoot the 002 Opti on Board, en sure th at t he fault i s with the option itself and not wi th the main power su pply.
96 Figure A -11. Troubleshooting Current Programming of CV Mode Figure A -12. Troubleshooting Current Programming of CC Mode Troublesho oting Stat us Indicators. The test set-up shown in Figure A-13 can be us ed to check each of the six status indicators.
97 Figure A -13. T roubles hooting Status Indicators To check Mode CV proceed as f ollows: a. Using test set- up, Figu re A- 13, connect to en d of 2K Ω res istor t o J3-36. b. Turn on power s upply . c. Using "Display Setting'' set voltag e and cu rrent or pow er supply for 1 volt an d 1 amp.
98 c. Turn on pow er supply. d. DVM sh ould read approx imately 5Vdc. e. Set vol tage and cu rrent cont rols of pow er su pply to maxim um . f. Decrease resistance of electronic load until " UNREGULATED" LED on front-panel lights. a. DVM sh ould now read betw een 0 and 0.
99 Table A-3. Replacem ent Parts REF. DESIG. M ODEL NO. PART NO. DESCRIPTION A7 All 5060-2854 Opt. 002 In terface Board C1,2 A ll 0180-023 0 fxd elect. 1 µ F 20% 50V C3 A ll 0180-282 5 fxd elect. 22 µ F 50V C4 A ll 0160-483 5 fx d cer. 0.1 µ F 10% 50V C5 A ll 0160-455 4 fx d cer.
100 Table A-3. Replacem ent Parts REF. DESIG. M ODEL NO. P A RT NO. DESCRIPTION R22 All 0686- 152 5 fxd. film 1.5K 5% 1/4W R23 All 0683- 153 5 fxd. film 15K 5% 1/4W R24 All 0683- 471 5 fxd. film 470 5% 1/4W R25,26 All 0683-1 235 fx d. film 12K 5% 1/ 4W R27 All 0686- 152 5 fxd.
101 Table A-3. Replacem ent Parts REF. DESIG. M ODEL NO. P A RT NO. DESCRIPTION U19 6023A 1826-03 93 IC Vol tage Reg. U19 6028A 5060-2 942 IC V oltag e Reg. h eatsink assy. U20 6023A 1826-06 07 IC Vol tage Reg. U20 6028A 5060-2 946 IC V oltag e Reg. h eatsink assy.
102 Definitions High = more positive Low = less positive Indicator and Qualifier Symbols OR function Polarity i ndicator, s hown outside l ogic sym bol. Any m arked input or outpu t is active l ow; any unm arked input or outpu t is active high. (Dynamic indicator) Any market input is edge-triggered, ie, active during transition between states.
103 SCHEM A TIC NOTES 1. ALL RESIST ORS ARE IN OHM S, ± 5%, 1/4 W, UNLESS OTHERWI SE INDICATED. 2. ALL CAPACIT ORS ARE IN MICROFAR ADS, UNLESS OTHERW ISE INDICATE D. 3. WHITE SILKSCREENED DOT S ON P. C. BOARDS INDI CATE ONE OF THE FOLLOWING: A. P IN 1 OF AN I.
104 Schematic Notes 1. W1 in normally open position. 2. W3 & W4 jumpered 3. Relays K1, K2 norm ally closed 4. S1A and S1B are located at the rear panel Figure A-15.
105 Figure A-16. Option 002 Board, Schematic Diagram.
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107 B Backdating Manu al backdating des cribes ch anges that must be made to th is manual f or power su pplies whose serial num bers are low er than those listed in the title page to this manual. Look in th e following table and located y our Agilent Model.
108 6023A In the parts list for th e Chassis Mech anical change the f ollowing: FROM TO Cove r-top 06023-0002 0 06023-0000 2 Cove r bottom 06023-00022 06023-0000 3 Trim t op 5041-8803 5040-7203 Trim s.
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