`S` Series Power Supplies (scanned)
Contents
1. to 609 G 386mm wide x 160mm high x 238mm deep 11 0kg MAINS OPERATING VOLTAGE Ihe TS3023 has 3 transformers 2 for the 30V 2 sections and 1 for the 5 HA section See page 8 for fuse ratings and operating voltage change of the 30V 2A Sections To ehange the operating voltage of the 5V HA Section follow the appropriate diagram below 110 120V Operation 220 240V Operation BLUE BLUE 110 120 2201240 BROWN BROWN CIRCUIT DESCRIPTION 5V A Power Supply DC Requirements With 240V input and T2 on the mains transformer provide 20Vrms on load This gives approximately 24V on Cl T3 and provide 15Vrms giving 20V on C2 Zener diode D9 gives a regulated 10V output for IC2 Switching Regulator The switching regulator is configured as a step down or buck regulator operating at 25kHz Q1 and Q2 form PNP darlington switch L1 smooths the output by storing energy when the switch is closed and supplies energy via D10 when the switch is open C4 is the reservoir capacitor R31 provides a minimum load L2 and C5 provide additional smoothing Regulation is provided by the control IC ICT The reference voltage is adjusted by VR1 to give an output range of 4V to 6V This reference is compared to the voltage on the sense terminal and the duty cycle is varied to the switching transistor to maintain regulation If the voltage drop across the current sense resistor reaches 200mV the drive to the switohi2. connects the meter to VR3 to display the current limit setting The current meter autoranges on the 15V HA supplies VR9 sets the change over point and ICHa selects the appropriate meter reference output of comparator IC4a is high when the current reading is below 1 9 and low when the current reading is above 1 9A R41 provides positive feedback and some hysteresis When current limit is reached IC4b takes control via the diode gate Q9 is turned on which enables low frequency oscillator 105 and d which flashes the triangle in the display Note that the ground lead of IC5 is connected to the V1 supply whilst the ground lead of IC6 is connected to DGI which is generated by IC2 for the LCD and is between 4 and 6 volts with respect to V1 Level shifting is provided by R54 and R63 Protection 016 provides protection against reverse voltages D9 D14 02 Q3 and Q4 provide protection against forward voltages CALIBRATION Equipment Required 4 5 digit multimeter with 10 range and better than 0 14 accuracy on both voltage and current 30V 2A Supplies Turn the 3 front panel controls to maximum output switch on Shorting bars must be fitted between the output and sense terminals Connect a voltmeter to the output terminals and adjust VR5 for 30 7V to 30 9V Adjust VR6 so that both voltmeters read the same Reduce the output voltage to approximately 15V and adjust VR7 so that both voltmeters read the same
3. Set the output to 19V and adjust VR4 so that the meter auto ranges at a point between 18 4V 19 6V Connect an ammeter across the output terminals and adjust VR8 to give 2 07A to 2 094 Reduce the current limit control to give approximately 1 8A output and adjust VR10 so that both current meters read the same Set the output switch to off short the output terminals and set the current limit control to approximately 1008 on the internal meter Note the reading set the output switch to on and adjust VR12 so that the meter still reads the same 15V HA Supplies Turn the 3 front panel controls to maximum output switoh on Shorting bars must be fitted between the output and sense terminals Connect a voltmeter to the output terminals and adjust VR5 for 15 3V to 15 5V Adjust so that both voltmeters read the same Connect an ammeter across the output terminals and adjust VR8 to give 4 10A to 15 Adjust VR11 so that both ammeters read the same Reduce the output current to approximately 1 5 and adjust VR10 so that both ammeters read the same Set the output current to 1 9 and adjust VR9 so that the current meter auto ranges at a point between 1 84A and 1 964 Set the output switch to off short the output terminals and set the current limit control to approximately 100mA on the internal meter Note the reading set the output switch to on and adjust VR12 so that the meter still reads the same Q
4. Transistor Mount 2 off 20611 0007 Mica Washer 2 off 20613 0010 Screw M3 x 12 4 off 20234 0025 Washer M3 2 off 20030 0263 Solder tag M3 2 off 22451 0203 Nut M3 4 off 20210 0101 47RJ W25 CF R23 23185 0470 See manufacturing changes on page 26 Assembly Logic Supply 44115 0070 consisting of Resistors Ref Description R1 1K0J W25 CF R2 10ROF W60 MF R3 LOROF W60 MF R4 100RJ W25 CF R5 820RF W60 MF R6 820RF W60 MF R7 080337 4W MR R8 1K69F W25 MF R9 1K10F W25 MF R10 1 69 W25 MF R11 AK2J W25 CF R12 62KJ W25 CF R13 3K90F W25 MF R14 200KJ W25 CF R15 200RF W25 MF R16 200RF W25 MF R17 3K60F W25 MF R18 3K90F W25 MF R19 36 W25 MF R20 3K90F W25 MF R21 100KJ W25 CF R22 11811 W25 MF R23 100KJ W25 CF R24 1001 W25 R25 1MOJ W25 CF R26 1MOJ W25 CF R27 1MOJ W25 CF R28 1MOJ W25 CF R29 1MOF W25 MF R30 1MOF W25 MF R31 200RF W25 MF R32 100 W25 R33 4780 W25 CF R34 36KO0F W25 MF R35 00RJ W25 CF R36 361017 W25 MF R37 6K81F W25 MF R38 3 90 W25 MF R39 1107 W25 CF Pot 10K Lin VR2 PS H 100R Cermet 212 Cermet VR3 PS H Capacitors Ref Description 33000 CZ 100U CS 1U0 C4 10000 40V Elec 25V Elec 63V Elec 10V Low ESR Part No 23285 2100 23226 0100 23206 0100 23185 1100 23206 1820 23206 1820 23271 0009 23202 2169 23202 2110 23202 2169 23185 2220 23187936020 23202 2390 23187 4200 23202 1200 23202 1200 23202 2360 23202 2390 23202 3360 23202 239
5. CF VR5 2K2 Cermet VR6 2K2 Cermet VR 220R Cermet VR8 2 2 Cermet VR9 Not used VR10 220 Cermet VR11 Not used VR12 100K CF Capacitors 47000 63V Elec CZ 10U 35V Elec C3 10U 35V Elec C4 1000 50V Elec C5 100U 50V Elec C6 100NM 250V P E Cy 100NK 63V P E C8 100NK 63V P E C9 1000 63V Elec C10 100NK 63V P E C11 330 11 63V P E C12 100NJ 100V P E C13 330NK 63V P E C14 100PG 63V Cer C15 330NK 63V P E C16 330NK 63V P E C17 100NJ 100V P E C18 330NK 63V P E C19 330NK 63V P E C20 100PG 63V Cer C21 330NK 63 P E C22 100NK 63V P E C23 100NK 63V P E C24 47PG 63V Cer C25 47PG 63V Cer Part No 23185 4100 23185 4100 23185 3220 23185 4180 23377 4100 25349 2220 23379 2220 233 19 L220 23379 2220 22594991220 23377 4100 23556 0217 23557 0647 23557 0647 23557 0610 23557 0610 23621 0312 23620 0246 23620 0246 23557 0249 23620 0246 23620 0227 23620 0207 25520 0227 23427 0322 23620 0227 23620 0227 23620 0207 23620 0227 23620 0227 23427 0322 23562050227 23620 0246 23620 0246 23427 0329 23427 0329 Semiconductors Ref Description D1 1N5401 D2 1N5401 D3 1N5401 D4 1N5401 D5 1N4002 D6 1N4002 D7 1N4002 D8 1144002 D9 1N4148 D10 4 D11 1N4148 D12 1N4148 D13 134148 D14 2 D15 144002 D16 1 117 to D23 144148 D24 2 025 4 D16 and Qi ZTX214 Q2 ZTX239 BC549 Q3 ZTX239 BC549 Q4 2 239 549 Q5 See Heatsink Assy 2 Q6 See Heatsink Assy 2 Q7 See Heatsink Assy 1 Q8 ZTX239 BC549 Q9 ZT
6. dual slope to D complete with display drivers R57 and C14 define the clock frequency of approximately A40kHz which if necessary be checked using a x10 oscilloscope probe on pin 38 R56 and C12 are the integrator components and C11 the auto zero capacitor C13 is the reference capacitor and R58 R59 and C15 are input filter components R16 and R17 attenuate the output voltage to suit The voltmeter auto ranges on the 30V 2A supplies between the high and low ranges by IC3b switching the meter reference The output of the comparator IC3b is high when the output is below 19V and low when the output voltage is above 19V The switching point is adjusted by VR4 R5 provides positive feedback which gives approximately 0 51 of hysteresis at the output terminals Q1 inverts IC3b s output providing complementary control signals These drive the analogue switches in 108 selecting the two references for the high and ranges They also select the decimal point via IC9 The decimal point is off when in phase with the back plane signal and on when in anti phase VR7 trims the voltmeter on the low range and VR6 trims the high range Current Meter IC2 is the same type as that used in the voltmeter The control signal A from the output switch drives Q10 and IC5b which provides complementary drive signals to IC7a and b With the output switch on connects the meter to R27 to measure output current With the output switch off
7. preset current limit is reached IC4b overrides the voltage error amplifier via the diode gate Output current is sensed by measuring the volt drop across R27 and this is compared to the voltage on the wiper of by D17 limits the output swing of IClb below OV VR8 sets maximum output current and VR12 trims the offset of IC4b so that the set current limit and the output current limit are equal This is done at low output current levels 100m D25 is a 2 45V voltage reference which is also used by the current meter Output Switch SW2a switches the V sense connection between the supply output and the sense terminal itself This is to overcome SW2b s contact resistance with the output on and to maintain feedback when the output is off D15 prevents the feedback loop from going completely open between switoh positions SW2b switches the supply output to the output terminal When the output switch is in the off position is connected to OV which signals the current meter to display the set current limit Note SW2 contacts are gold plated on silver and the correct replacement type must be used Note also that if SW2 is disconnected it must be rewired the same way round This is because SW2a must have gold contacts while the gold SW2b contacts will have been vapourised due to the high switching current and will have normal silver contacts a result Voltmeter 101 is a standard 3 5 digit panel meter IC This is a
8. supplies for the error amplifiers and digital metering The above circuitry is on a separate pcb Pass Transistors Q6 and Q7 are mounted on separate heatsinks and must be H hometaxial types They are in parallel and current sharing is provided by emitter resistors R24 and R25 Driver transistor Q5 shares one of the heatsinks and altogether Q5 Q6 and Q7 make up a darlington emitter follower stage R23 is on one of the heatsinks and R24 R25 R26 are on the main board 15V 4A units R24 and R25 are on the power supply board R26 provides a discharge path for C9 when no load is connected Diode Gate Q8 15 an emitter follower the base of which is controlled by either of the two error amplifiers via diodes D12 and D13 Voltage Error Amplifier It should be noted that is referred to the positive output terminal this means that the voltage from the error amplifier is small sufficient to turn on the driver and pass transistors and overcome resistive losses 1038 is summing amplifier when VR2 is fully clockwise pin 2 is at Feedback is from the negative output terminal via R19 to pin 3 where it is summed with the current from VR1 Fine control of the output voltage is achieved with which moves the psuedo ground of IC3a D11 limits the output swing of IC3a below OV D10 is a 2 15 voltage reference which is also used by the voltmeter circuitry VR5 sets the maximum output voltage Current Error Amplifier If the
9. 0 23185 4100 23202 4118 23185 4100 23185 4100 23185 5100 23185 5100 23185 5100 23185 5100 23202 5100 29202255100 23202 1200 23185 1100 23185 0470 23202 3360 23185 1100 23202 3360 23202 72681 24320222390 23185 2100 23347 0130 29379 10 2337992220 Part No 23956 0218 23557 0650 24557 0609 235570810 Capacitors continued Ref Sis C6 E C8 C9 C10 C11 C12 13 C14 C16 C17 C18 Cig C20 C22 C23 C24 Description 10000 10V Low ESR 100U 25V Elec 100NK 63V P E 100NK 63V P E 10NJ 400V P E 4N7K 100V P E 100PG 63V Cer 100NK 63V P E 330NK 63V P E 330NK 63V P E 100PG 63V Cer 330NK 63V P E 330NK 63V P E 330NK 63V P E 100NK 63V P E 100NK 63V P E 100NS 63 Cer 1 02 500V Cer 100NK 63V P E 10NZ 63V Cer Part No 23557 0810 23557 0650 23620 0246 23620 0246 23621 0310 23620 0245 23427 0322 23620 0246 23620 0227 23620 0227 23427 0322 23620 0227 23620 0227 23620 0227 23620 0246 23620 0246 23438 0007 23424 0445 23620 0246 23427 0325 Note C21 is fitted across the output terminals Semiconductors Ref Description D1 1N5401 D2 1N5401 D3 1N5401 D4 1N5401 D5 1N4002 D6 1N4002 D7 1N4002 D8 1N4002 D9 10 Zener D10 LOTOO30 D11 1N4002 D12 1N4002 D13 1N4148 D14 1N4148 D15 1N4148 D16 6V2 Zener BDT92 02 BD234 Q3 ZTX214 Q4 ZlA229 BC549 SCR BT151 500R Note Part No 29117 0020 25117 0020 29117 0020 25117 0020 25115 0907 22115 0907 2311
10. 115 0907 Not used ZN404 27161 0120 1N4148 25021 0901 1N4148 25021 0901 1N4148 25021 0901 1N4002 25115 0907 1N4002 25115 0907 1N5401 25117 0020 to 1N4148 25021 0901 1N4002 25115 0907 2 404 27161 0120 ls wired across the Red Black output terminals ZTX214 25341 0214 ZTX239 BC549 25380 0229 ZTX239 BC549 25380 0229 2TX239 BC549 25380 0229 See Heatsink Assy 2 See Heatsink Assy 2 See Heatsink Assy 1 2 239 549 ZTX214 2 239 549 29380 0229 25341 0214 25380 0229 Ref Description 7106RCPL 2 7106RCPL IC3 TLOJ2CP IC4 TL072CP IC5 84011 IC6 4070BE IC7 4066BE IC8 4066 IC9 4070BE IC10 78L05ACP 1611 79L05ACP LCD 3 5 Digit LCD 2 Other Parts on PCB Assy Description Zero Ohm Resistors PCB Links 44 oft PCB Part No 27153 0003 2 153 0003 27106 0606 27106 0606 27226 0110 27226 0700 27226 0660 27226 0660 27226 0700 27160 0011 27160 0012 26100 0070 15V Part No 23185 0000 35515 1030 PCB Assembly Resistors Ref Description R1 R2 R3 R R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R26 R27 R28 R29 R30 R31 R32 R33 R34 R35 R36 E357 R38 R39 R40 R41 R42 R43 R48 R49 R50 R51 R52 R53 R54 R55 R56 R57 R58 R59 47RJ 10KJ 100KI 22KJ 22MJ 68K0F ll1K5F 50 20 0 750RF 560RJ 56KJ 7 50 6K8J 10 10 1 00 470 100KF 1K8J A7RJ 10KJ W25 W25 W
11. 19 0100 Switch rocker SW2 3 4 22219 0110 Fuseholder 22300 0210 Shroud for fuseholder 22458 0001 Knob black 20657 0002 Cap black for knob 20657 0009 Pot 1 0 lin 1 23348 0060 Pot 1 0 lin VR2 23348 0020 Pot 10K log VR3 23348 0030 Terminal Red 22571 0670 Terminal Black 22571 0680 Terminal Green 22571 0690 Shorting bar output terminals 35331 0080 Bezel for displays 31711 0020 Solder tag output terminals 22451 0200 Washer 4BA shakeproof output terminals 20037 0247 Diode 1N5401 D16 output terminals 25117 0020 Bracket switch support for SW1 2 3 31512 0270 Washer M3 Heatsink to rear panel etc 20030 0263 Grommet 3109A black for heatsink wiring 22443 0002 Foot 20662 0510 Solder tag s prf 6BA Earth wire to earth tag 20037 0400 Screw No 6 x 3 8 1 Self tap C1 Case and Feet securing 20062 0700 Screw No 6 x 1 2 l Self tap Transformer securing 20662 0710 Captive Nut Transformer 61 and Case securing 20213 0010 Screw M3 x 8mmL Nylon PCB to front panel and Heatsink cover to spacers 20224 0200 Screw M5 x Earth tag to lower case 20234 0017 Cable tie for wiring 20653 0204 Spacer M3 x 30mmL Hex studded Heatsink mounting 20661 0236 Spacer M3 x 30mm round clearance Heatsink mounting 20661 0243 Screw M3 x 40mmL Heatsink cover 20234 0038 175 Parts Common continued Description Part No Bush strain relief for mains cable 22448 0220 Ma
12. 25 W25 W25 W25 W25 W25 W25 W25 W25 W25 W25 W50 W25 W25 W25 W25 W25 W25 W25 W25 GF CF MF MF MF MF MF CF MF MF MF MF CF CF See Heatsink 0 680 0R68J 2K2J 0810 0 10KJ 10 0KJ 2M7J 10KJ LKOOF 9K10F 1K8J 2W5 2775 W50 7 40 W25 W25 W25 W25 W25 W25 W25 Not used Not used 750RF 20KO0F W25 W25 Not used Not used Not used Not used to 1001 118KF 100KJ 100KJ 1 00 1MOOF 100KJ W25 W25 W25 W25 W25 W25 W25 Not used 100KJ 118KF 100KJ 100KJ W25 W25 W25 W25 WW WW CF WW CF CF CI 30V 2A Assy 2 50PPM 50PPM 50PPM 5OPPM 44115 0050 Part No 23185 0470 23185 3100 23185 4100 23185 3220 2322150030 23202 3680 23202 3115 23202 2750 23202 3200 23202 1750 23185 1560 23195 23550 2320292750 23179 2680 23185 3100 23202 3100 23202 5109 23202 4470 23202 4100 23185 2180 23185 0470 23185 3100 23284 0010 23284 0010 23179 2220 23271 0008 23185 3100 23185 4100 29185 5270 23185 3100 23202 2100 2220272910 23185 2180 232021750 23202 3200 23185 4100 23202 4118 23185 4100 23185 4100 23202 5100 23202 5100 23185 4100 23185 4100 23202 4118 24185 4100 23185 4100 Ref Description R60 1001 W25 R61 1001 W25 CF R62 22KJ W25 CF R63 1801 W25 CF VR4 100K
13. 25 CF VR4 Not used VR5 2K2 Cermet VR6 Not used VR 220R Cermet VR8 1K0 Cermet VR9 220R Cermet VR10 220R Cermet VR11 2K2 Cermet VR12 100K CF Capacitors C1 4700U 63V Elec 22 100 35V Elec 100 35 Elec C4 100U 50V Elec 100U 50V Elec C6 100 250V C7 100 63V P E C8 100 63V P E C9 1000 63V Elec C10 100NK 63V P E C11 330NK 63V P E C12 100NJ 100V P E C13 330NK 63V P E C14 100 63V Cer C15 330NK 63V P E C16 330NK 63V P E C17 100NJ 100V P E C18 330NK 63V P E C19 330NK 63V P E C20 100PG 63V Cer C21 330NK 63 P E C22 100 63V P E C23 100 63V P E C24 47PG 63V Cer C25 47PG 63V Cer C26 47000 63V Elec Part No 23185 4100 23202 4118 23185 4100 23185 4100 23185 4100 23185 4100 22318553220 23185 4180 23379 2220 23379 1220 24537992100 2397991220 220 9 571 233 23379 2220 23377 4100 23556 0217 23557 0647 23557 0647 23557 0610 23557 0610 23621 0312 23620 0246 23620 0246 23557 0249 23620 0246 256205022 23620 0207 23620 0227 23427 0322 23620 0227 23620 0227 23620 0207 2362050227 2362070227 23427 0322 23620 0227 23620 0246 23620 0246 23427 0329 23427 0329 25959690217 Semi Ref Di D2 D3 D4 D5 D6 D7 D8 D9 D10 Dil D12 D13 D14 D15 16 D17 D23 D24 D25 D16 and 21 Q2 Q3 Q4 Q5 Q6 Q7 Q8 210 conductors Description Part No Not used Not used Not used Not used 1N4002 25115 0907 1N4002 25115 0907 1N4002 25115 0907 1N4002 25
14. 5 0907 25115 0907 29130750239 25115 0710 25115 0907 29132997 25021 0901 25021 0901 25021 0901 25135090220 25334 0012 25334 0009 25341 0214 29398090229 29210 0010 D10 01 02 SCR are fitted to the Heatsink Assy on PCB Semiconductors continued Ref Description Part No Te UC3524AN 27160 0310 IC2 7106RCPL 27153 0003 63 17 3 27001 0020 IC4 4066B 27226 0660 TCS 4070B 27226 0700 IC6 LM358 27106 0513 3423 1 27102 0010 LCD 3 5 Digit LCD 26100 0070 Other Parts on Logic Supply PCB Assy Description Part No Heatsink 31512 0310 Washer SIL PAD 4 off 20613 0006 Bush TO220 3 off 20611 0003 Screw M3 x 10mmL 4 off 20234 0011 Washer M3 4 off 20030 0263 Washer M3 s proof 6 off 20037 0301 Stud M3 x 8mmL for heatsink 2 off 20205 0600 Screw M4 x 30mmL cheese head nylon for L1 20224 0210 Nut M4 nylon for L1 20210 0201 16 Pin IC Socket 22574 0120 14 Pin IC Socket 2 oft 22574 0119 8 Pin IC Socket 2 off 22574 0118 Zero ohm resistor 14 off 23185 0000 Fuse Clips 2 off 22312 0240 Fuse 5 Amp A S FS2 22315 0237 Inductor 200uH 4 L1 22154 0010 Inductor 2 2uH L2 22042 0100 Inductor 7 Turns L3 22152 0010 Inductor 5 9uH L4 22042 0110 PCB 35515 1040 Connector Assy 16 Way Inter PCB consisting of Cable 16 Way IDC Fiat 7 5 ins off 10148 0001 Connector transition 16 Way 2 Off 22575 0047 Parts Common to all PSUs Description Part No Clip capacitor for Cl 20655 0520 Switch rocker SW1 222
15. 5 CF R12 A7KJ W25 CF R13 7 50 W25 MF R14 6K8J W50 CF R15 lOKJ W25 CF R16 10 W25 MF R17 1 00 W25 MF R18 Not used R19 51K0F W25 MF R20 1K8J W25 CF R21 47RJ W25 CF R22 lOKJ W25 CF R23 See Heatsink R24 083302 2W5 WW R25 08332 3 7 2W5 WW R26 AK2J W50 CF R27 OR10J 7WO WW R28 10 W25 CF R29 100 W25 CF R30 2 7 W25 CF R31 10KJ W25 CF R32 110017 W25 MF R33 31901817 W25 MF R34 110017 W25 MF R35 91108 W25 MF R36 665 W25 R37 750 W25 MF R38 201087 W25 MF R39 11K5F W25 MF R40 7 50 W25 R41 2M7J W25 MF R42 Not used R43 to R48 100KJ W25 CF R49 118KF W25 MF R50 100KJ W25 CF R51 1001 W25 CF R52 1 00 W25 MF R53 1 00 W25 R54 1001 W25 CF Assy 2 50PPM 44115 0060 Part No 23185 0470 29185 4100 23185 4100 23195 3220 23185 0000 23202 3200 22202 1759 29105 12560 23185 3270 292002727850 23179 2680 23185 3100 2920293100 23202 5100 23202 3510 23185 2180 23185 0470 23185 3100 23274 0010 23274 0010 23179 2220 23271 0008 24185 3100 23185 4100 2310595270 23185 3100 23202 2100 23202 2390 23202 2100 25202 2989 23202 1665 23202 1750 22940223200 22202 2115 2320252750 23202 5270 23185 4100 23202 4118 23185 4100 23185 4100 29202 5100 23202 5100 23185 4100 Ref Description R55 Not used R56 100KJ W25 CF R57 118KF W25 MF R58 1001 W25 CF R59 1001 W25 CF R60 100KJ W25 CF R61 1001 W25 CF R62 22KJ W25 R63 1801 W
16. 536 0650 Case lower 33536 0710 Carton 38114 0140 Additional Parts unique to Triple Description Part No Faceplate 33331 1390 Case upper 33536 0720 Case lower 33536 0730 Cover Heatsinks 31512 0230 Cover Heatsinks 31512 0310 Screw M4 x 6mmL for case brackets 20234 0034 Screw M3 x 8mmL for case brackets 20234 0012 Bracket switch support for SW4 31512 0290 Res 84K5F W25 CF R101 23202 3845 Trimpot 10K Cermet VR101 23379 3100 Spacers Hex M3 x 30mmL Logic Supply to Case 20661 0247 Logic Supply 22115 0100 Attachment parts for transformer Transformer Screw 4 x 6mmL 20234 0028 Washer M4 20030 0266 Washers proof M4 20037 0304 Nut 4 20210 0102 PSU Fuses Description Part No 1A Anti surge HRC for 220 240V Single PSUs 22315 9501 2 Anti surge for 110 120V Single PSUs and 220 240V Dual amp Triple PSUs 22315 9502 4A Anti surge HRC for 110 120V Dual amp Triple PSUs 22315 9503 See manufacturing changes on page 26 MANUFACTURING CHANGES From mid 91 new switches both AC mains and DC output and fuseholder were introduced necessitating changes to all chassis faceplate and heatsink covers At the same time the heatsink mounting holes in the chassis were changed to accommodate a standard pre drilled heatsink Early and new parts are not interchangable the earlier switches and fuseholders are available as spares Units using the new parts can be easily identified b
17. D15 IN 4002 m Ort R1 50V 1N5401 mounted on terminals D24 1N4002 y fe 20 0 19 TO GREEN TERMINAL ON FRONT PANEL CURRENT 79L05 BPV REF LOI 1 4108 IMS 100K DGV K R 1 7 LCO IC INTERCONNECTIONS R56 rh cn 2 id 100k Jao s SEI 1 40 1 40 s 2 TV coment feer ot er joa a 4 7 REF HI V R 6 REF HI I ETG 00 118 1 150 118 1 38 C14 REF LO I 38 C PINN 2 rm in VA 6 W 100p IC 1 IC2 felele slee SEES vie dez eps es ea ea aa ra oa o2 o2 oz gt PI lll aha E CURRENT 11 10 180K i 2 m VM DISPLAY Q10 S DISPLAY Jas RS amp s mp Rte T8 Ey 08 i VM Vi EAA 2 25 L un Dee vL v vare L 2 UE su 12 BPV gt 13 TS1541S
18. R101 TO MASTER 0 P 8 K5 TRACKING TOMASTER 0 P FINE COARSE Sw3 B ISOLATEDO TRACKING SW3 A OUTPUT SWITCH 1N4002 D 10 4 SENSE swi V2 D15 IN 4002 REF LO V 100 016 REF HI V 1N5401 mounted on terminals 470K 1 4 0 19 E TO GREEN TERMINAL V407 79105 0 40 21 ud JOC 2 dp R43 1 C16 C17 R56 2 100K 330n 100r 100K 330 100 V 28 29 27 1 ER amm REF HI I 36 38 REF LO I LCD IC INTERCONNECTIONS warna cm 1111022122012 2221217 bef fel E eae afe VAVAVAVAVAVAVAVAVAVAVAVAVAVA cornu lo nf aa rem 97 reme oen alafta alaista Eee Va 1477277704177 V 28 29 27 1 REF HI V 36 REF LO V IC 1 7106RCPL IC2 7106RCPL VOLT METER DISPLAY SEE TABLE CURRENT METER DISPLAY SEE TABLE BPI 9 E u p 10 180K Jis ICSd Ic5c 8 8 RS4 T R53 1 ES 1 0 1 430n TV 12 amp 070 E 13 SLAVE UNIT ONLY SHOWN TS30215 225 238 30V 2A SECTIONS t V1 R20 ees OUTP 1N4002 10 4 6
19. S Series DC Power Supplies Service Manual 11 7 Book Part Number 48511 0060 Issue 3 GENERAL Service Handling Precautions Service work should only be carried out by skilled engineers Please note that the tracks on the printed circuit board are very fine and may lift if subjected to excessive heat Use only a miniature temperature controlled soldering iron and remove all solder with solder wick or suction before attempting to remove a component Dismantling the Instrument WARNING Opening the instrument is likely to expose live parts The instrument shall be disconnected from all voltage sources before any adjustment replacement or maintenance and repair during which it shall be opened If afterwards any adjustment maintenance repair of the opened instrument under voltage is inevitable it snall be carried out only by a skilled person who is aware of the hazards involved 1 Remove the 8 side screws plus 2 top screws on triple units or 2 handle screws on dual units holding the case upper 2 Lift off the case upper 3 remove a main linear supply peb remove the 4 nylon fixing screws and remove the 3 control knobs which are retained by grub screws The now be pulled clear of the front panel and the wiring harness allows it to be rotated clear of the case lower To remove the logic supply pob remove the 4 M3 screws through the rear panel H Transistors Q5 Q6 and 07 on the linear supp
20. VR12 N VR11 VR10 VR9 VR8 LOCATION OF CALIBRATION POINTS VIEWED FROM COMPONENT SIDE TECHNICAL SPECIFICATION 530235 See page 5 for specifications of the main outputs LOGIC OUTPUT Output Voltage Range Output Current Output Switch Output Terminals Over Voltage Protection Output Protection Load Regulation Line Regulation Ripple and Noise Meter Type Meter Resolution Voltage Current Meter Accuracy Voltage Current GENERAL Power Requirements Input Voltage Power Consumption Environmental Operating Range Environmental Storage Range Size Weight 4 to 6 Volts Amps minimum current limit approxiamtely 5 Amps Isolates the output and permits output voltage to be set before connecting the load 4mm terminals on 19mm 75 spacing Dual speed circuit giving typically 20mseco up to 7 Volts and typically 2usec above 7 Volts Clamped by the over voltage protection circuit for forward voltages 7 Volts and up to 3 Amps forward current Diode clamped for reverse voltages and up to 3 Amps reverse current lt 0 5 for 50 load change lt 0 5 for 10 line voltage change lt 20 rms 50mV pk pk 0 5 3 5 digit LCD for voltage or current 10mV 10mA 0 5 of reading 1 digit 0 5 of reading 1 digit Internally set for 110 120 220 or 240 VAC 50 60Hz Input Voltage Range 10 of voltage setting 300VA 5 c to 40 C 20 to 804 RH
21. X214 010 2ZTX239 BC549 IC1 7106RCPL 7106RCPL TLO72CP ICA TL072CP IC5 4011 IC6 40 058 IC7 4066BE IC8 4066BE IC9 4070BE IC10 78L05ACP 1611 79L05ACP LCD 3 5 Digit LCD 2 Part No 25117 0020 25117 0020 25117 0020 25117 0020 25115 0907 2511550907 25115 0907 25115 0907 25021 0901 27161 0120 29021 0901 25021 0901 25021 0901 25115 0907 29115 09957 2511740020 25021 0901 24511570907 2161 0120 15 wired across the Red Black output terminals 25341 0214 29390 0229 25380 0229 25380 0229 25380 02329 25341 0214 29350 20229 27153 0003 21153 20003 27106 0606 27106 0606 2 226 0110 27226 0700 2122670660 27226 0660 21226 0700 27160 0011 21716070012 26100 0070 Other Parts on PCB Assy 30V Description Part No Zero Ohm Resistors PCB Links 44 off 23185 0000 PCB 35515 0950 Rear Mounted Heatsink Assys for all S series PSUs Note 30V Single Dual amp Triple PSUs use identical Heatsink Assys The 15V 4A PSU Heatsink Assys use the same components but are wired differently Heatsink Assembly 1 consisting of Description Part No Heatsink Type 1 20670 0090 2N3055H 07 25386 0010 Transistor Mount 20611 0007 Mica Washer 20613 0010 Screw M3 x 12mml 2 off 20234 0025 Washer M3 2 off 20030 0263 Solder tag M3 22451 0203 Nut M3 2 off 20210 0101 Heatsink Assembly 2 consisting of Description Part No Heatsink Type 2 20670 0100 2N3055H Q5 Q6 2 off 25386 0010
22. be adjusted before VR2 which calibrates the voltmeter mode Opto ecoupler IC3 provides level shifting between the control circuitry and the LCD drivers When the power supply goes into current limit the LED inside IC3 is turned off which turns the photo transistor off enabling low frequency oscillator IC5B and IC5A which flashes the delta sign in the display CALIBRATION Equipment required 3 5 digit multimeter with a 10AMP range Connect a HAMP load to the output terminals 1R2 resistor switch the output on and adjust the voltage control as necessary to give approxiamtely 4 AMPS on external ammeter Adjust VR3 so that the meters read the same VR3 is loeated on the display pob Remove the HA load and connect a voltmeter to the output Note the reading on the external meter switch the output off and adjust VR2 so that the meter reads the same Switch the output on and off to check the reading on each meter VR2 is located on the pob which is fastened to the rear panel SERVICING NOTES must be a Unitrode A Part 01 210 and SCR must be the specified parts C4 and C5 are low ESR types temporary short may be put across C6 to disable the shut down and ease trouble shooting PARTS LIST PCB Assembly 15V 4A Resistors Ref Description R1 A7RJ W25 R2 10 W25 CF R3 100 W25 R4 22KJ W25 CF R5 Not used R6 Zero ohm link R7 Not used R8 Not used R9 A20K0F W25 MF R10 2750RF W25 MF R11 560 W2
23. de the operating voltage label and fuse should be changed The correct fuse type is 1A 250V HRC time lag 20mm for 220 240V single units 2A 250V HRC time lag 20mm for 110 120V 2A 250V HRC time lag 20mm for 220 240V dual units 4A 250V HRC time lag 20mm for 110 120V WARNING THIS INSTRUMENT MUST BE EARTHED Any interruption of the protective conductor inside or outside the instrument or disconnection of the protective earth terminal is likely to make the instrument dangerous Intentional interruption is prohibited Power Supply DC Requirements Pins 22 and 23 on the mains transformer of the 30V 2 supplies provide 34Vrms off load and this is rectified by the bridge rectifier 11 to D4 is the reservoir capacitor The off load voltage across Cl is approximately 46V Pins 22 and 23 on the mains transformer of the 15V 4A supplies provide 19Vrms off load and this is rectified by the bridge rectifier BR1 C1 and C26 are the reservoir capacitors off load voltage across 1 26 is approximately 26V R14 discharges the reservoir capacitors when the unit is turned off with no load connected C6 and R1 form a damping network The voltage across the reservoir capacitors supplies the pass transistors Diodes D5 to D8 rectify the centre tapped 20V winding on pins 18 to 20 and with reservoir capacitors C4 and C5 provide approximately 13V Regulators IC10 and 1 with diodes D22 and D23 provide regulated 5V6
24. ecause the DC output terminals are mounted on a small pcb The new part numbers are as follows Description Original Part New Part Heatsink type 1 20670 0090 20670 9001 Heatsink type 2 20670 0100 20670 9001 Spacer Heatsinks 20661 0236 20661 0242 Spacer Heatsinks 20661 0243 20561 9302 Bushes Heatsinks 20611 9305 Switch rocker SW 22219 0100 22219 0060 Switch rocker SW2 3 4 22219 0110 22219 0080 Fuseholder 22300 0210 22300 9301 Single chassis 33536 0700 33536 0900 Single heatsink cover 31512 70130 31512 0370 Faceplate TS1541S 33331 1320 33331 1740 Faceplate TS3021S 33331 1310 33331 1730 Faceplate TS3022S 33331 1110 4353312913590 Dual chassis 33536 0710 33536 0910 Faceplate TS3023S 33331 1390 33331 1760 Triple chassis 33536 0730 33530670920 Triple heatsink cover 31512 0230 31512 0340 Additional Parts Per each output PCB terminals 35515 1210 Screw 4BA terminals 20134 9005 Spacer 4BA terminals 20661 0257 Washer green earth terminal E 22571 069 4 j o 2 _ 2 2 va uu N 8 5 i Bs 5 Peter S8 Vig 8 ag i m C gt lt 88 8 1 VV 89 um ou CcOCo an a 4Q 0 0 0 0 0 20 m C n Ki lt gt m DISPLAY VR101 10K
25. ins cable cut from 10175 0110 Label wiring instructions 37541 0490 Mains lead with Euro plug 22491 0200 Mains lead with USA plug 22491 0210 Handle 29211 0110 Serial No label 37522 0160 End caps for carton 20664 0190 Guarantee card 48581 0230 Instruction Book 48511 0050 Additional Parts Common to 15V and 30V Single PSUs Description Part No Case upper 33536 0630 Case lower 33536 0700 Warning Label 240V 37559 0100 Warning Label 220V 37559 0110 Warning Label 120V 37559 0120 Warning Label 110V 37559 0130 Carton 38114 0130 Additional Parts Common to 15V and 30V Single amp Dual PSUs Description Part No Cover heatsink 31512 0130 Additional Parts Common to 30V Dual and Triple PSUs Description Part No Bracket handle case 33111 0180 Warning label 240V 37559 0140 Warning label 220V 37559 0150 Warning label 120V 37559 0160 Warning label 110V 37559 0170 Additional Parts Common to 30V Single Dual amp Triple PSUs Description Part No Transformer 30V 22115 0070 See manufacturing changes on page 26 Additional Parts unique to 15V PSU Description Part No Faceplate 5333191320 Ceramic beads for R24 25 22482 0010 Bridge Rectifier BR1 25211 0300 Push on Tags for BR1 22454 0041 Transformer 22115 0090 Additional Parts unique to 30V Single PSU Description Part No Faceplate 33331 1310 Additional Parts unique to 30V Dual PSU Description Part No Faceplate 3333 LAILL Case upper 33
26. lies and Q1 02 D10 and SCRI on the logie supply are insulated from the heatsinks De Reassemble in reverse order Operating Voltage See the Power Supply section on page 8 for details of changing the operating voltage of single and dual units See page 20 for details of changing triple units TECHNICAL SPECIFICATION Output Voltage Setting Output Current Setting Output Mode Output Switch Output Terminals Output Impedance Constant Voltage Constant Current Output Protection Load Regulation Line Regulation Ripple and Noise Transient Response Temperature Coefficient Meter Type Meter Resolution Voltage Current Meter Accuraoy Voltage Current Power Requirements Input Voltage Input Voltage Range Power Consumption Environmental Operating Range Environmental Storage Range Size Weight By coarse and fine controls resolution better than omV across the range By single logarithmic control The power supply operates in constant current or constant voltage modes with automatic cross over display annunciator indicates constant current mode Isolates the output and permits voltage and current limits to be set up before connecting the load 4mm terminals on 19mm 75 spacing Typically 5mOhm at 1kHz Typieally 50kOhm with voltage limit at maximum Up to maximum output voltage 20 Volts forward diode clamped for reverse voltages and up to 3A reverse curren
27. ng transistor is terminated limiting the output current Shut down of the regulator occurs if the output voltage falls by 100mV determined by R13 and R14 QH is turned off allowing C6 to charge up via R34 turning on the transistor connected to pin 10 of 1 This turns the regulator off and the voltage on pin 5 of 1068 falls further and results in the power supply being latched off Recovery is achieved by turning the mains supply off for sufficient time for C6 to discharge approximately 20 seconds Frequency compensation for the feedback is provided by C10 11 and R12 Over Voltage Protection ICT is an OVP IC and compares the voltage on pin 2 with an internal reference typically 2 6V If the voltage pin 2 exceeds the reference the output drive to SCR1 is enabled after a delay generated by C3 This mode of protection functions for output voltages between 6 4V and and takes typically 20ms If the output exceeds 7V SCR1 is fired instantly via pin 5 Metering IC2 is a standard DVM IC and is the same type as used in other sections of the power supply With the output switch off Q3 is off turning ICHA off and on via inverter ICHD so that the meter reads output voltage With the output switch on is turned off and is turned on so that the meter reads output current by measuring the voltage across RT VR3 calibrates the meter for current measurement it is also the meter reference so VR3 must
28. t lt 0 01 of maximum output for 50 load change 0 014 of maximum output for 10 line voltage change Typically lt imV rms lt 20usec to within 50mV of setting for 90 load change Typically lt 100ppm C Independent autoranging 0 5 3 5 digit LCDs for voltage and current indication 10mV up to 20V 100mV above 20V up to 2A 10mA above 2A 0 2 of reading 1 digit 0 5 of reading digit Internally set for 110 120 220 or 210 46 2 10 of voltage setting 150VA for single units 300VA for dual units 5 to 40 C 20 to 80 RH 200C to 60 C 160mm wide x 160mm high x 238mm deep single unit 308mm wide x 160mm high x 238mm deep dual unit H 9kg single unit 9 6kg dual unit FUNCTIONAL DESCRIPTION Ihe relationship between the major circuit elements are shown in the blook diagram opposite The pass transistors are mounted on heatsinks at the rear of the instrument They are controlled by the error amplifiers via the diode gate The diode gate provides automatic cross over of constant voltage and constant current In the constant voltage mode the error voltage amplifier maintains the constant output voltage set by the coarse and fine controls independent of load the voltage is sensed across the output terminals In the constant current mode or when the preset current limit is reached the current error amplifier overrides the voltage error amplifier via the diode gate and maintains constan
29. t output current independent of load resistance the current is sensed across R27 The output voltage is displayed by the digital voltmeter This block also incorporates the autorange circuitry and decimal point drive The digital current meter block also incorporates the autorange circuitry drive circuitry for the constant current annunicator and control logic which allows the set current limit to be displayed The power supply provides high voltage and power for the output V2 and a split low voltage supply for the control circuitry V1 V V 2 DIODE PASS GATE TRANSIS TORS V SENSE SENSE I SENSE V SENSE V1 V1 CURRENT 11 ERROR CURRENT AMPLIFIER SENSE LIMIT AND REFERENCE A OUTPUT TERMINALS V1 V 2 V SENSE VOLT V SENSE METER V SENSE SENSE V2 V1 25 PSU V1 I SENSE CURRENT METER I SENSE V VI Functional Block Diagram CIRCUIT DESCRIPTIONS Power Supply Mains Operating Voltage The operating voltage of the instrument is shown on the rear panel label Should it be necessary to change the operating voltage follow the appropriate diagram below 240V Operation 220V Operation 240V 220V O BROWN O BROWN O BLUE O BLUE 120V Operation 110V Operation 120V 110V O BROWN O BROWN O BLUE OBLUE If a change is made the operating voltage label and fuse should be changed If change is ma
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