Agilent Technologies AGILENT MODELS 6023A and 6028A manual

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. Microf iche Part No.[...]

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 measurements ar e traceable to the United States National Institute of Standards and Tech nology, to the exte nt allowed by t he Institute’ s calibrat[...]

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. Agil en[...]

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 Both direct and alternating cu rrent Cauti on, ho t sur face Three-phase altern ating current Caution (ref er to accompanying documents) Earth (grou [...]

5 TABLE OF CONTENTS Introduction ............................................................................................................................................................................ 7 Scope ........................................................................................................................................[...]

6 Overvoltage Protection (OVP) Circui t........................................................................................... ................................. 49 Power- Limit Comparator ......................................................................................................... ....................................... 49 Control- [...]

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. Bot h manual s cover Agi lent Models 6023A /28A; di[...]

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. The last four digits are a sequ ential number [...]

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. After t roublesh ooting and repai r of a def ective power su pply you can usually veri[...]

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 4.5 to 5.5Vdc @ 35m A[...]

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,P A gil ent 6296A Variable Voltage Tra ns form er (autotransf ormer) Range greater than -13% to +6% of nomi nal inp ut A C volta ge 1KVA P,A P = perfo[...]

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. Adjust A2R2 4 to o btai n the volt age ra nge specified in the results. 0.5V ± 50 µ V Resista nc[...]

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 A4 Pow er Mesh T3 4 then 5 Board A4 Pow er Mesh CR7 4 then 5 Board A2 Control Board Constant Voltage (CV) Circu it All Except Current Source All 1 t [...]

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. It elimin ates the need for conn ecting res[...]

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. g. When the reading settles, record the output voltage again. Check that the two reco[...]

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 ) ± 0.0080Vdc (6028A ) PARD (Ripple And Noise). Periodic and random deviati ons (PARD)[...]

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. Proceed as follo[...]

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. Proceed as follows: a. Connect the test equ ipment as sh[...]

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. Measure temperature coefficient by placing the u[...]

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. Load Effect (L oad Regu lation). Con stant cu rrent load eff ect is the change in dc ou tput curre[...]

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. c. Tur n up out put cur rent to: 29.0Vdc (6023A ) 10Vdc (602 8A) Check that the unit &ap[...]

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). Where m aintenance can be perform ed without po[...]

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 2.5V ref 2.50 A 2U9 (OUT) 6 0.5V ref 0.50 A2R 79,A2R80 Analog-Ci rcuits Bi as Voltages 2 + 15V 1[...]

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. M ost se mico nducto rs ca n suffer seriou s performan ce degradation as a resu lt of stat[...]

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. When replacing any heatsink- mounted components ex cept thermostat, smear a th in coating of heatsink comp[...]

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. A 3 Front-Panel Board Remo[...]

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. Table 3-2 provides troubl eshooting inform ation[...]

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. The ac mains cord conn ects to the unit's A1T3 bias transf ormer via an isolation transf [...]

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. Figure 3-2. Modified Mains Cord Set For Troubleshooting With the mains cord u nplugged proceed a[...]

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 . e. Complet e the setup of Figure 3- 1 by att aching an ac m ains cord to test poin ts TP1 (L, black w ire) and TP2 (N, w hite wi[...]

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 2 Control ckts: CV & CC thru on- & off-Pulse Oneshots * lo hi A2 & A4 PWM and DC -to- DC C onverte r: A4Q3 and A 4Q4 probably faile d hi l[...]

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 2.5Vdc s et by v oltage regu lator A2[...]

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 Circuit Output n oise ( > 1KH z) A 1, A4 T ransf ormer A1T1, Ou tput Filter, snubbers A4R7 /R8 /C 5 / CR5, A 4R13/ 14 / C6 /C R6, A4R 33 /C13 CV regul [...]

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. Refe r to Down Prog rammer, pag e 39, for t he [...]

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 1.1 sec DROPOUT A2Q5 (col) (RELAY ENABLE) cycle pow er tran sistion 5.0 to 0.3Vdc at 1.0s Tro[...]

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. NO R gate A4U1 B turn s off t he PFE Ts thr ough p ulse tra nsfor mer A4T2 and tr ans[...]

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. Innerloop Am p A2U10A stabilizes the CV loop w ith IVS inpu t from A2U10C. The measurements below verify that the operational amplifier circui ts provide expected positive and nega[...]

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 ). If oscillations stop, the differentiator is probab ly at fault. Troubleshooting Down Programmer The down prog rammer decreases the output when either MASTER ENABLE is low or CV ERR OR is more negat[...]

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 - 1.5Vdc A2J 3- 13 1 0 hi A2J 3- 13 2 0 lo A2J 3- 13 1 0 lo A2J 3- 13 10 c ycle po wer h i Note Connectin g a test probe t o either in put of eit her com parator in t he OV Fli p flop (pin s A2U14- 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 . Autorang ing is a name for circuitry which automatically makes full po w er a[...]

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. Internal Bias Supplies provide f[...]

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 Overvoltage-Protectio n circuit, enables the On Pulse D river for th e PFET swi tches, an d with th e AC Surg e-Dropout Det ector starts th e 1-S econd-D[...]

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. In th e outerloop, CV Error Am plifier A2U8 compares V- MON, a buffered fraction o[...]

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. As with the CV C ircuit, two comparison amplifier loops accom plish the comparison. OCS is the voltag e across Cu rrent-M onitoring resi stor A1R 3, and it s enses the out put curren t for [...]

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 + 1.5Vdc. As an illustration of CV-CC selection , suppos e the unit is in CV operat ion an d diode A2C R24 is f orward biased by a low CV[...]

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. The Dropout Detector, including com parators A2U20A and A2U20C, operates by enabling a capacitor- timing ramp when[...]

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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. b. Agilent Model in which the particular part is used. c. Agilent Part Number. [...]

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 serial number, an d any option or s pecial modification (J) n umbers of th e inst rument; Agilen t part num ber; circuit reference desig nator; an d desc[...]

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 ssem bly C1 All 0160- 4962 Capacitor, 1 µ F + 10% 50V ac C2,3 All 0180- 342 6 Capacit or, 590 µ F + 50-10% 400V C4 All 0180- 3427 Capacitor, 300 µ F[...]

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 0.1% 1/8W R12 All 0698- 8695 Resis tor 36K Ω 0.1% 1/8W[...]

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, 0.047 µ F 20% 50V C3 6023A 0160-480 1 Capacitor, 100 pF 5% 10 0V C3 60[...]

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, 0.047[...]

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/ 4W R8 All 2100- 3353 Trimm er 20K Ω side adjust R9 6023A 2100-335 0 Trimm er 200 side adju st R9 6028A 2100-399 3 Trimm er 200 side adju st R10 6023[...]

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 11.3K Ω 1% 1/8W R54[...]

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 2.2K Ω 5% 1/4 W R90 All 0683- 2715 Resis tor 270 Ω 5% 1/ 8[...]

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 2.2K Ω 5% 1/ 4W R143 All 0683- 104 5 Res istor 100K Ω 5% [...]

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 0.047 µ F ±[...]

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 0.1% 1/8W R71 6028A 0698- 886 1 Resist or, fix ed film 6.66K Ω 0.1[...]

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% 1.6k V C7 All 0180- 0155 Fixed elect 2.2 µ F +20% 20V C8 All 0160-[...]

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 1.43k 1% 1/8W R28 All 0757- 027 9 Fi xed film 3.16K 1%1/8W R29 All 0[...]

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 Connector post ty pe header A1J2 All 1251-5 384 Connector post ty pe header A1J3 All 1251-8 676 Connector post type XA2P1 All 1251- 866 5 Connect or post ty[...]

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 trip, top All 5001- 054 0 Trim, s ide 7in All 5021- 841 7 Frame f ront All 5041- 8801 Foot All 5041- 881 9 Retainer, s trap ha ndle All 5041- 882 0 Ret[...]

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 . Included in this section are: a. Compon ent location illustrati ons (Figu res 6-1 throug h 6- 5), show ing the phy sical location and ref erence design ators of almost al[...]

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. Unless otherw ise noted, res istors are eit her 1/4W, 5% or 1/8 W, 1%. Part s l[...]

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 su pply's output by three diff erent control m et hods; 2) sign als indicat ing the power supply modes an d conditi ons; 3) tw o di ff erent digi[...]

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. Acc ur ac y: @25 ° C CV: 0.5% + 12m V (6023A) 0.5% + 70m V (6028A ) CC: 1.0% + 110mA (6023A) 1.0% + 500m A (6028A ) Voltage Pr ogramming: 0 t o 5V provides 0 to m axim um rated volt age or cu rre[...]

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: +4.75V to 16V R[...]

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. + 5V ± 3% at 100m A +15V ± 3% at 75m A -15V ± 4% at 75mA Short Circuit Output Curr ent: +5V 125mA ± 6% + 15V 103mA ± 6% [...]

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. c. Insert the already prepared 002 boar d [...]

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. A brief description of some circuits is also provided. The unit is shipped for front-panel operation w ith mode switch settin gs as follows: B1 B2 B3 B4 B5 B[...]

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. Local Programm ing (Figu re A-3). The su pply can be sw itched back and fort h between rem ote and local prog ramm ing while initially checking [...]

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. Refer to Figure A -3. Either method will enable relays K1 (CV) and K2 (CC) to sw[...]

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). A resistance v ariable f rom 0 to 4K ohm s can be used to program t he ou tput volt age or current from [...]

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). T he foll owing parag raph provi d[...]

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. A 0 to full scale current -m on itor output is availa ble between p[...]

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. The f ollowing parag raph provides a brief circuit description (See schema tic diagra[...]

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. The pulse is generated after primary power is turned on and also after resum ption of power fol[...]

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 ). The dropout sign al indicates loss of primar[...]

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. Figure A -10. System Shutdown Using Bias Supply Output Fig[...]

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. This can be accom plished by rem o ving the top cov er, inside cov er and discon necting the two ribbon cables from the A 2 Control board and check ing the operat ion of the main su [...]

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. This set-up will temporaril y defeat the isolation of the status lines. Before attempting to t[...]

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. d. DVM sh ould read betw een 0 and 0.4[...]

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 0.4Vdc. To check LOW BIA S or AC Dropou t proceed as follow s: a. Usin[...]

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. 0.0 µ F 20% 50V C6 A ll 0160-483 5 fx d cer. 0.1 µ F l0% 50V C7 [...]

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. film 1.5K 5% 1/4W R28 All 0683- 153 5 fxd. film 15K 5% 1/4W R29,30 All 0[...]

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. VR1- 8 A ll 1902-0556 zener 20V 5% PD=1W IR=5 µ A VR9 All 1902-318 5 zener 12.4V 5%[...]

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. any [...]

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. C. (EXCEPT FOR U18 SEE NOT E 4 ). B. POSITIVE END OF A POLARI ZED CAPACITOR. C. CATHODE [...]

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. Option 002 Board, Component Location[...]

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. Then look at each serial num ber listed for this g roup. If the serial num ber of your power[...]

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 ides 5001-0540 5001-0440 Front Fram e 5021-8417 5021-5817 Feet 5041-8801 5040- 7201 Strap Han dle Assy 5062-3703 5060-9803 Strap Re tain Rear 5041-88[...]