Tektronix PS280 Service & Reference Manual Download

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Summary of Contents for PS280

Page 1: ...qualified service personnel only To avoid personal injury do not perform any servicing unless you are qualified to do so Refer to the Safety Summary prior to performing any service Service Reference...

Page 2: ...ce change privileges are reserved INSTRUMENT SERIAL NUMBERS Each instrument has a serial number on a panel insert tag or stamped on the chassis The first two digits designate the country of manufactur...

Page 3: ...1 1 General _i Specifications 1_2 General Operating Instructions 2 1 Front Panel 2 1 The Variable Power Supplies 2 2 The Fixed Voltage Power Supply 2 3 Rear Panel 2 4 Theory of Operation 3 1 General...

Page 4: ...ation 5 1 Requirements for Performance 5 1 Personnel 5 1 Warm up Period 5 1 Access 5 1 Test Equipment 5 1 Adjustment Procedures 5 3 Independent Mode 5 3 Series Tracking Mode 5 5 Parallel Tracking Mode...

Page 5: ...ly Removal 6 17 Front Panel Controls Circuit Board Removal 6 19 Output Connectors Circuit Board Removal 6 21 Power Transistor Circuit Boards Removal 6 23 Options and Accessories 7 1 Power Cord Options...

Page 6: ...rd Adjustment Locations 5 8 Figure 5 2 Display Assembly Circuit Board Adjustment Locations 5 9 Figure 5 3 Front Panel Controls Circuit Board Adjustment Locations 5 9 Figure 6 1 Top Cover Removal 6 11...

Page 7: ...4 2 Load Resistor Values for Current Checks 4 4 Table 4 3 Load Resistor Values for Ripple Checks 4 6 Table 4 4 Load Resistor Values for Voltage Checks 4 8 Table 6 1 Relative Susceptibility to Static...

Page 8: ...t t w w w s statements identify conditions or practices that could result in personal injury or loss of life These two terms appear on equipment CAUTION indicates a personal injury hazard not immediat...

Page 9: ...pply conductor and ground A protective ground connection through the grounding conductor in the power cord is essential for safe system operation Grounding the power supply The PS280 or PS283 Laborato...

Page 10: ...y without the panels or covers Do Not Operate in Explosive Atmospheres ThePS280 or PS283 Laboratory DC Power Supply provides no explosion protection from static discharges or arcing components Do not...

Page 11: ...BmMfJWnr Specifications...

Page 12: ...A The current on the PS283 vari able power supplies varies from 0 to 1 A In all other respects the instruments are identical Unless otherwise noted descriptions and procedures in this manual apply to...

Page 13: ...ment Two 0 to 30 VDC one 5 VDC 5 0 0 25 VDC at 3 0 A maximum foldback current limited 0 30 constant VDC at 2 0 constant A maximum PS280 or 1 0 constant A maximum PS283 5mV 0 01 3mVPS280 0 01 5 mV PS28...

Page 14: ...in 335 mm 13 2 in 11 5 kg 25 4 Ib PS280 9 0 kg 19 9 Ib PS283 Table 1 3 Environmental Characteristics Temperature Relative Humidity 10 Cto 70 C 70 0 C to 40 C 80 Table 1 4 Electrical Characteristics M...

Page 15: ...IHF LTOperating Information...

Page 16: ...nstru ment The PS280 or PS283 features two tracking modes series and parallel If both push button switches are disengaged out the two vari able power supplies operate independently If the left switch...

Page 17: ...ariable power supply CURRENT VOLTAGE Figure 2 2 Variable Power Supply Controls 1 The output terminals for the power supply allow you to plug in the test leads The red one on the right is the positive...

Page 18: ...e corresponding display for the slave variable power supply All other controls are the same for both variable power supplies The Fixed Voltage Power Supply Figure 2 3 shows the controls for the fixed...

Page 19: ...the right If the line voltage is in the range of 220 to The bottom switch determines whether the line voltage is In the low or the high end of the voltage range Push it to the left if your line volta...

Page 20: ...BBSftXfTTheory of Operation...

Page 21: ...tifier circuit consists of diodes D1011 through D1014 that form a full wave bridge rectifier The output from the bridge rectifier is filtered by capacitor C102 The filtered output voltage is applied t...

Page 22: ...lected Tracking Operation Series Tracking Parallel Tracking Independent O P Off On Off On On Off Off On Off When in the SERIES Tracking mode The Master negative output is shorted to the Slave positive...

Page 23: ...r and Filter D3021 D3024 C303 C304 Relay Control RL101 RL102 JJ Main Rectifier and Filter D1011 D1014 u Series Regulator Q1071 R1261 Tracking O P Control RL501 RL503 3 Relay Control RL301 RL302 Curren...

Page 24: ...is applied to the Series Regulator circuit The Series Regulator circuit consists mainly of Q402 and R407 that deliver a regulated voltage to the Laboratory DC Power Supply 5 V Fixed output The Current...

Page 25: ...SIB Performance Verification...

Page 26: ...justments in Section 5 Adjustments Requirements for Before you perform these performance verification procedures you need to P e r f o r m a n c e address the following requirements Warm up Period The...

Page 27: ...s 50 MHz 3 vertical deflection accuracy Equipment Example Tektronix part number 003 0675 00 TEKTRONIX DM252 Tektronix part number 311 2494 00 TEKTRONIX 2225 Purpose Adjustments Adjustments Adjustments...

Page 28: ...e digital multimeter to measure a DC voltage of 25 volts Connect the digital multimeter to the and terminals of the MASTER output Set the Laboratory DC Power Supply MASTER VOLTAGE control until the mu...

Page 29: ...supply Set the digital multimeter to measure a DC current of at least 1 amp PS280 or 0 5 amps PS283 a Connect the multimeter load resistors and test switch to the and terminals of the Slave output as...

Page 30: ...gure 4 2 Constant Current Ripple and Noise Test Setup 1 Check the Master current ripple a Set up the equipment Disengage both TRACKING mode switches both switches out so that the power supply is in th...

Page 31: ...cks Mo e INDEP PARALLEL PS280 RL 15n 70W 7 a 140 W Rs 0 5 n 5 W 10n 30w PS283 RL 30 n 40 W 15 a 70 W Rs 0 5 n 5W 0 5 fl 5W 2 Check the Slave current ripple a Set up the equipment Disengage both TRACKI...

Page 32: ...d in Figure 4 3 See Table 4 4 for the appropriate values of the load resistor b Verify the voltage output range Check that the Laboratory DC Power Supply can be adjusted from 0 to 30 V c Set up the eq...

Page 33: ...s Connect the digital multimeter and load resistors to the and terminals of the Slave output as indicated in Figure 4 3 See Table 4 4 for the appropriate values of the load resistor b Verify the volta...

Page 34: ...WKSWXiAnnns Adjustment...

Page 35: ...if used infrequently Requirements for Before you perform this procedure you need to address the following require Performance ments Personnel This procedure is only to be performed by trained service...

Page 36: ...volts adjustment Adjust VR102 for a reading o f 1 5 mV within 15 mV on the multimeter c Set up the equipment Set the digital multimeter to measure a DC voltage of 35 v Set the MASTER VOLTAGE control t...

Page 37: ...aster AMPS VOLTS meter selection switch to AMPS Set the digital multimeter to measure a DC current of 2 A Connect the digital multimeter to the and terminals of the Master output Set the MASTER CURREN...

Page 38: ...range Set the MASTER VOLTAGE control to minimum fully counterclockwise Set the digital multimeter to measure a DC voltage of 16 mV Connect the digital multimeter to the and terminals of the Master out...

Page 39: ...ode Set the MASTER VOLTAGE and CURRENT controls to minimum fully counterclockwise v Set the digital multimeter to measure a DC current of 4 A Connect the digital multimeter to the and terminals of the...

Page 40: ...3 25 A Disconnect the multimeter from the power supply and reconnect the variable load without changing the setting to the terminals of the 5 V Fixed output Set the digital multimeter to measure a DC...

Page 41: ...Minimum Parallel 5 V Overload a iiliM O O 8 0 I Ill lfl Mi 0 riiJS oo VR303 VR301 VR306 VR302 Slave Slave Serial Slave Maximum Maximum Minimum Volts Minimum Amps Volts Volts 5V Amps Figure 5 1 Master...

Page 42: ...Slave Slave Master Display Maximum Maximum Voltage Amps Amps Figure 5 2 Display Assembly Circuit Board Adjustment Locations Display Voltage Tracking Voltage U 1 1 1 1 o o r u i r 1 Figure 5 3 Front Pa...

Page 43: ...F M_n_nj Maintenance...

Page 44: ...ful in isolating problems to modules by testing power supply perform Section 5 Adjustment Procedures addresses after repair adjustment and thevinterval between periodic adjustments It contains a proce...

Page 45: ...tive components or assemblies should be performed only at a static free work station by qualified service personnel 4 Nothing capable of generating or holding a static charge off the work station surf...

Page 46: ...ncy bipolar transistors JFET Linear microcircuits Low power Schottky TTL TTL Least Sensitive Relative Susceptibility Levels1 1 2 3 4 5 6 7 8 9 1 Voltage equivalent for levels voltage discharged from a...

Page 47: ...P r o c e d u r e s a s O f t e a s Peratin 9 conditions require Accumulation of dirt in the power supply can cause overheating and component breakdown Dirt on compo nents acts as an insulating blanke...

Page 48: ...t on the outside of the power supply with a lint free 2 Remove remaining dirt with a lint free cloth dampened in a general pur pose detergent and water solution Do not use abrasive cleaners 3 Clean th...

Page 49: ...crack pins causing them to break off Wiring and Cables Loose plugs or connectors Burned broken or frayed wiring Firmly seat connectors Repair or replace modules with defective wires or cables Chassis...

Page 50: ...porate 6 Use hot 120 F to 140 F deionized water to thoroughly rinse them 7 Dry all parts with low pressure deionized air 8 Dry all components and assemblies in an oven or drying compartment using low...

Page 51: ...ng This preparatory information that you need to properly perform the procedures that follow List of Equipment required to remove and disassemble all modules Disassembly procedures for removal of all...

Page 52: ...ver This and other items that are need ed for complete disassembly of the instrument are listed in Table 6 4 N o 1 2 3 4 Table 6 4 Tools Required for Name Phillips head screwdriver Flat blade screwdri...

Page 53: ...Removal and Installation Procedures Figure 6 1 Top Cover Removal PS280 PS283 Laboratory DC Power Supply Module Level Service Manual REV AUG 1991...

Page 54: ...101 from the Slave circuit board 6 Unplug J1101 from the Slave circuit board 7 Remove the two screws lock washers and flat washers securing the circuit board 8 Tilt the Slave circuit board out slightl...

Page 55: ...See Figure 6 2 for the location of the Fuse circuit board To aid in locating the connectors referred to in this procedure see Figure 9 7 in the Diagrams sec tion The removal of other circuit boards is...

Page 56: ...of the Fuse circuit board is done in the reverse order AC Selector Circuit Board Removal The AC Selector circuit board is located at the left rear of the power supply behind the Fuse circuit board See...

Page 57: ...ocated at the bottom of the circuit board The black wire Is soldered to 0 The gray wire is soldered to 100 The orange wire is soldered to 120 The black wire from the power switch is soldered to TO J60...

Page 58: ...and J306 from the Master circuit board 4 Unplug J106 and J402 from the Master circuit board 5 Unplug J403 from the Master circuit board 6 Unplug J1111 from the Slave circuit board 7 Unplug J206 and J2...

Page 59: ...assembly but is not required Removal of the top center and top right chassis rails also make for easier access to the Front Panel Display assembly but is not required wore Remember to label each conn...

Page 60: ...Removal and Installation Procedures Figure 6 4 Front Panel Display Assembly Removal REV AUG 1991 Maintenance...

Page 61: ...ecessary to perform this procedure NOTE Remember to label each connector as you disconnect them 1 Unplug connectors J3082 J5012 J1082 and J4043 from the Front Panel Controls circuit board 2 Remove the...

Page 62: ...Removal and Installation Procedures Figure 6 5 Front Panel Controls Assembly REV AUG 1991 Maintenance...

Page 63: ...the Master circuit 2 Pull off the plastic cover over the power switch located at the bottom left of the front panel This can be done by carefully prying the power switch cover off with a small flat bl...

Page 64: ...Removal and Installation Procedures Figure 6 6 Output Connectors Circuit Board and Power Switch Location REV AUG 1991 Maintenance...

Page 65: ...onnector J1051 or J3051 depending on which Power Transistor circuit board you are removing 2 Remove the two screws securing each power transistor to the heat sink and circuit board 3 Unsolder the lead...

Page 66: ...nW WnnrLnn Options...

Page 67: ...Option A4 North American 220 V 10 A 60 Hz Tektronix part number 161 0104 08 Option A5 Switzerland 240 V 6 A 50 Hz Tektronix part number 161 0167 00 Standard Accessories The PS280 or PS283 Laboratory D...

Page 68: ...B SmXJAnnnn Parts List...

Page 69: ...ade to accommodate improved components as they become available and to give you the benefit of the latest circuit improvements Therefore when ordering parts it is impor tant to include the following i...

Page 70: ...example of the indentation system used in the Description column 12 3 4 5 Name Description Assembly and or Component Attaching parts for Assembly and or Component END ATTACHING PARTS Detail Part of As...

Page 71: ...LAIN HEX 0 281 32 X 0 375 CURRENT VOLTAGE KNOB SCREW MACHINE M3 X 0 5 X 6 MM L SCREW PNH THREAD FORMING FRONT PANEL CONTROL CIRCUIT BOARD ATTACHING PARTS C501 CSC 5OV 22UF C502 CSC 50V 1000PF 0503 CSC...

Page 72: ...RJ HT RC W 30KJ HT RCy W 2 2MJ HT RC iW 220KJ HT RC AW 10KJ HT RC AW 20KJ HT RM AW 30 1KF HT SW PUSH SPUE22AE30 IC NE555R TEXAS IC MC4N33 MOTO 4N33 TFK 4N33 GE VR10KB 16A RK163111R691 RKDA10R691 VR 1K...

Page 73: ...1 NB 0 5 0208 DISPLAY RED GAP LTS546A1 NB 0 5 0601 Diode 1N4004 G I HT 0602 Diode 1N4004 G I HT 0603 Diode 1N4004 G I HT 0604 Diode 1N4004 G I HT 0605 DISPLAY RED GAP LTS546A1 NB 0 5 0608 DISPLAY RED...

Page 74: ...RF HT RM W 4 99KF HT RM W 267RF HT RC AW 47KJ HT RM AW 100KF HT RC W 470RJ HT RC W 470RJ HT RM AW 27 KF HT TEST SELECTED RM W 27 KF HT RM W 1KF HT RM aW 1MF RM W 267RF HT RM W 4 99KF HT 4270 06DOOOO 4...

Page 75: ...NS U6O3 IC UA7805UC FAIRCHILD LM7805CT NS AN7805 MATS VR201 SVR 1O M 2KB 1O0PPM VR202 SVR 1O C 1OKB H PS280 SVR 10 C 470RB H VR601 SVR 10 M 2KB 100PPM VR602 SVR 10 C 10KB H SVR 10 C 470RB H XU201 IS40...

Page 76: ...Parts List Figure 8 1 Exploded View A REV AUG 1991 Parts List...

Page 77: ...S102 SW SLIDE SDKGA4 F7422070M SDKGA4274A 8103 SW SLIDE SDKGA4 F7422070M SDKGA4274A END ATTACHING PARTS SPACER POST 32 5 MM L SPACER POST 30 MM L SCREW MACHINE M3 X 8 MM SCREW SELF TAPPING 4 20 X 0 3...

Page 78: ...e 1N4148 TOSHfTFK PHIL FAIRJ HT 0109 Zener W 8 89V 9 29V RD9 1 EB3 NEC Only 0110 Diode 1N5402 G I D116 Diode 1N4148 TOSHCTFK PHIL FAIRJ HT D303 Zener W 5 0V 5 2V HZ5C2 Hitachi Only D304 Zener 2W 11 9V...

Page 79: ...SD 880Y TOSH RM W 2KF HT RM AW 10K HT RC iW 150KJ HT RC W 68RJ HT RCV W 1 5KJ HT RCV W 1KJ HT RC W 1 5KJ HT RC AW 13KF HT RM iW 30 1 KF HT RCVHW 4 7MJ HT RC iW 10MJ HT 4270 O6D00O0 4270 06D0000 4270 0...

Page 80: ...AW 1 5KJ HT RC AW 2 4KJ HT RC AW 2 4KJ HT RR5W 0 3RJ 100PPM PS280 RR5W 0 5RJ 100PPM PS283 RC AW 1KJ HT RC AW 1KJ HT RC AW 47RJ HT RC AW 47RJ HT RC AW 4 7KJ HT RC AW 4 7KJ HT RC AW 4 7KJ HT 2002 27B2J...

Page 81: ...TTOM RANSFCRMER TS101 TRANSFORMER PS283 2 SCREW ASSEMWSHR M3X8 SLAVE CIRCUIT BOARD PS280 SLAVE CIRCUIT BOARD PS283 ATTACHING PARTS CSE1 35V 470UZ CSE1 35V 470UZ CSE1 25V 100UZ CSE1 25V 1O0UZ CSM 50V 0...

Page 82: ...JUMP WIRE JUMP WIRE JUMP WIRE JUMP WIRE WAFER JD PI 5004 WAFER JD PI 5004 WAFER B2P VH WAFER B6P VH WAFER B12B XH A TR2SA 1015GR TOSH TR2SA715C HITACHI TR 2SC 1815GR TOSH PS280 ONLY TR2SC1815GR TOSH...

Page 83: ...4 7KJ HT R334 RC AW 15KJ HT R335 RC AW 19KJ HT R336 RC AW 4 7KJ HT R337 RC AW 27KJ HT R338 RC AW 15RJ HT R339 RC AW 15KJ HT R340 RC AW 15RJ HT R341 RC AW 30KJ HT R342 RC AW 9 1 KJ HT R401 RC 1W 470RJ...

Page 84: ...Parts List Figure 8 2 Exploded View B REV AUG 1991 Parts List...

Page 85: ...6 A 60HZ 1 Test Lead Set of 3 Pairs Optional Accessories PS280 PS283 Service Manual Power Cord Option A1 Universal European 220 V 6 A SOHz Power Cord Option A2 United Kingdom 240 V 6 A 50Hz Power Cor...

Page 86: ...BBiimmnnnri Diagrams w...

Page 87: ...r supply C o m p o n e n t V a l u e s Electrical components shown on the diagrams are in the following units unless noted otherwise Capacitors Values one or greater are in picofarads pF Values less t...

Page 88: ...JP03 I H f C 1 1 2 o 1 s QP J4041 t 0304 s s I I VR403 I Figure 9 1 Master Circuit Board PS280 PS283 Laboratory DC Power Supply Module Level Service Manual...

Page 89: ...Figure 9 2 Slave Circuit Board PS280 PS283 Laboratory DC Power Supply Module Level Service Manual...

Page 90: ...JP37 j P 3 8 o J2092 J2112 J2102 J2122 o J2021 J2041 J207 J205 o SiSlSlSlgT l l l i l g IT S 1 i u g s s J2091 J2111 J2101 J2121 Figure 9 3 Display Assembly Circuit Boards PS280 PS283 Laboratory DC Po...

Page 91: ...f o o Figure 9 4 Output Connectors Circuit Board I r v 2 o o s A r r U U ft s s s ll r T 4Sh o o 1 s J1082 Figure 9 5 Front Panel Controls Circuit Board PS280 PS283 Laboratory DC Power Supply Module L...

Page 92: ...J1042 F110 P109 P103 P104 0 no F102 P105 P107 Pica o J113 J313 o J3021 o Master Figure 9 6 Power Transistors Circuit Boards Figure 9 7 Fuse Circuit Board Figure 9 8 AC Selector Circuit Board PS280 PS...

Page 93: ...O J1O23 512 2 BOARD f P 31 jp c TO J3OS3 512 2 BOARD GL P1033 FROM PI13 JX 512 2 BOARDt 512 2 BOARD TD J1043 PM 515 BOARD 1 ft FROM P313 512 2 BOARD J r GPC 577 BOARD TO J1044 2 PM 515 BOARD w REFEREN...

Page 94: ...FUSE F102 A P1D1 FROM MAIN POWER TRANSFORMER o FROM P1023 B P3O1 FROM MAIN POWER TRANSFORMER FROM P3O23 D FROM J1D33 1 GPC 512 1 GPC 512 1 I I BPC S1S 1 REV AUG 133i MAIN AUXILIAF Y RECTIFIER S FILTE...

Page 95: ...A B D lAf TO J1DB1 REV AUS 1991 VOLTAGE CURRENT CONTROL S TRACKING CONTROL...

Page 96: ...FROM J 4O2 v_i I F RL5O3 3i JPSO RL5O2 x WSO KSOS If3 RLSDi REV AUG LSSi Vr iioli T 1 u x 1 1 1 FROM JiDB a EA 1 FROM J3DB _2_ BA B SV FIXED 3A TO P4041 512 5 BOARD NOTE H REFERENCE DESIGNATORS IN PAR...

Page 97: ...r i NOTE REFERENCE DESIGNATORS IN PARENTHESES ARE SILK SCREENED ON THE BOARD PARTIA _ 512 1 BO REV AUG 1331 MASTER VOLTAGE CURRENT...

Page 98: ...FROM J l i O l A B D REV AUB 1SS1 SLAVE VOLTAGE CURRENT...

Page 99: ...5 A FROM JliDl x A mm a g T Eo B FROM J4O42 1 I r PARTIAL 512 S BO FROM J4O42 2 5 VOLT FIXED...

Page 100: ...D CURRENT ACCRURACY m 1 U2112 I S J 0206 0208 f J LED O S31 r JPO4 7 r PM S15 PARTIAL CONTROL BOARD FROM J10B1 JP1OS M JP1O4 LSOIO 13 LED11 Tg TT LEO1G 10 T 0B03 t mis Q PM 513 PARTIAL DISPLAY BOARD R...

Page 101: ...A3H DHVDB 3HX NO O3N33H3S X1I5 3HV 53S3HJ_N3HVd NI SMDJ VN3IS3D 3DN3HHJ3H K 3XDN TBDEr WOHd QHVOB AVldSIO HVIiaVd BTS Wd 6 6 6 6 6 6 133135 01 GT031 BQ9D CEt EdD H SHEdP zi SS OJ 03T M 3D9D ft 3 a2Da...

Page 102: ...N 512 2 C cT 512 2 BOARD J1D fl GLL P1 T FROM PI13 512 2 BOARD FROM P313 512 2 BOARD TO J1033 512 2 BOARD TO J1O 43 PM 515 BOARD TO J1044 PM 515 BOARD NOTE K REFERENCE DESIGNATORS IN PARENTHESES ARE S...

Page 103: ...REV AUB iagi MAIN AUXILIARY RECTIFIER S FILTER...

Page 104: ...M J402 I5C l f x_2 RLS03 RL5O2 M iOa RLSO1 M II SUi Vz r 100 2 M BS I i 1 FROM JiOB e SA 1 1 FROM J3OS _S r ISA B 3 3V FIXED 3A TO P4O41 512 6 BOARD NOTE M REFERENCE DESIGNATORS IN PARENTHESES ARE SIL...

Page 105: ...IT NOTE N REFERENCE DESIGNATORS IN PARENTHESES ARE SILK SCREENED ON THE BOARD VR104 R10 4VAR I VOLTAGE CONTROL OVER LOAD SV FI EO 3A 1 H II SEV AUG 1331 VOLTAGE CURRENT CONTROL S TRACKING CONTROL...

Page 106: ...REV AUB 1SS1 MASTER VOLTAGE CURRENT...

Page 107: ...REV AUB 133t SLAVE VOLTAGE CURRENT...

Page 108: ...u FROM J11O1 FROM J4O4S 1 I t PARTIAL 512 5 BO FROM J4O42 2 5 VOLT FIXED 0...

Page 109: ...W313W HV1I3ID dBlSVN TBBt SOY A3d paVDB 3HX NO 03N33H3S X1IS 3UV B3B3H N3MVd NI SWCU VNSIS3O 33N3W3J3H K 31DN...

Page 110: ...H3 L3H HVlIGia 3AV IS TEST SHY A3H DaVDB 3H L NO 03N33W3S X1IS 3HV S3S3H N3UVd NI 5W0J VN9IS30 33N3H343H M i...

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Tektronix PS280, Service & Reference Manual

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