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TTI EX752M, Service Manual

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TTI EX752M Service Manual Download Page 26

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 
 
 
 
 

 

Thurlby Thandar Instruments Ltd 

Glebe Road, Huntingdon, Cambridgeshire PE29 7DR, England 

Telephone: (44) 01480 412451  Fax: (44) 01480 450409  

e mail: [email protected]     web site: www.tti-test.com 

 

 

Summary of Contents for EX752M

Page 1: ...EX752M 75V 150V Multimode Power Supply Service Manual Manual Part Number 48511 0470 Issue 1 ...

Page 2: ...rent displayed when off Output Terminals 4mm safety terminals on 19mm 0 75 pitch Output Impedance Typically 5mΩ in constant voltage mode Typically 50kΩ in constant current mode voltage limit at max Output Protection Output will withstand forward voltage of up to 85V Modes A and B or 170V Mode C Reverse protection by diode clamp for reverse currents up to 3A Load Line Regulation 0 01 of maximum out...

Page 3: ...s Reading rate 4 Hz Meter Resolutions 100mV 10mA Meter Accuracies Voltage 0 3 of reading 1 digit Current 0 6 of reading 1 digit Operating Modes Output 1 meters are blanked in Modes B and C GENERAL AC Input 110V 240V AC 10 Installation Category II Power Consumption 500VA max Operating Range 5ºC to 40ºC 20 to 80 RH Storage Range 40ºC to 70ºC Environmental Indoor use at altitudes up to 2000m Pollutio...

Page 4: ...ated by the use of an extension cord without a protective conductor When the instrument is connected to its supply terminals may be live and opening the covers or removal of parts except those to which access can be gained by hand is likely to expose live parts The apparatus shall be disconnected from all voltage sources before it is opened for any adjustment replacement maintenance or repair Capa...

Page 5: ...ty by means of a 1 1 isolation transformer of at least 700VA High voltages up to 400V are always present in the primary side circuitry which lies in a clearly defined area at the rear of the main printed circuit boards 1 Remove the 6 side screws and front handle screw to release the top cover 2 Unplug the 3 connector assemblies linking the main pcb to the front panel control pcb noting their orien...

Page 6: ...iliary winding on the boost inductor L3 rectified and filtered by D7 C2 and C15 and also from a power back winding on the main converter transformer rectified and filtered by D6 C87 and C93 R131 R132 R133 R71 C4 and C34 form a two stage RC filter to feed a voltage proportional to the mains voltage to pin 7 which after a 1 V2 transformation is fed to the multiplier For a universal mains input the v...

Page 7: ...e waveform from IC7B is processed by Q19 to provide a synchronisation pulse for IC8 Main Outputs The component references given refer to Channel A the left hand slave channel which is marked Output 1 on the front panel Channel B the right hand master Channel is identical except for Q15 and L7 which are up rated components because Channel B supplies 4 Amps in the 75V 4A mode refer to the circuit di...

Page 8: ...nels A and B respectively e g OP A Voltage Control IC7C buffers the voltage control potentiometers VR1 and VR2 VR5 sets the maximum output voltage D6 provides the reference VREF which is nominally 2 45V IC7A is a differential amplifier with a voltage gain of 14 7 for an output voltage of 75V the voltage at IC7C pin 8 will be 5 1V VR9 trims differential gain to ensure good voltage regulation see Ca...

Page 9: ... isolated Parallel The slave side is turned off and the control of the master is changed such that it can supply up to 4 Amps SW2 C disconnects the voltage setting controls from the voltage error amplifier IC7 A of the slave forcing the slave output to 0V Signal X is high on IC8 A turning off the slave display Signal P is low on IC108 B doubling the master current limit Whenever the parallel mode ...

Page 10: ...t ON Check LED is on and check for a reading of 00 0V 0 1V on the Volts display and DMM check the Amps display reads 0 00 0 01A Set voltage and current controls to maximum Adjust VR5 VR105 maximum output volts for a reading of 75 35V to 75 45V on the DMM Adjust VR6 VR106 measured output volts until the Volts display matches the reading on the external DMM Switch output OFF Adjust VR10 110 preset v...

Page 11: ...the load until the CC LED is just ON check that the current display measured output current matches the preset current 0 05 Amps Mode C 150V 2A With no loads connected and both outputs OFF select Mode C 150V 2A Switch the output ON and check that the reading on the Volts display measured output volts is 150 1V Switch the output OFF and adjust VR111 to give the same reading on the Volts display pre...

Page 12: ...TSINK TO220 CLIP ON 29DEG W SKIC2 3 20670 0400 HEATSINK PCB MTG 3 7DEG C W SKQ5 20670 0401 CLIP FOR 20670 0400 SKQ5 20670 0410 HEATSINK BOLT ON 7DEG C W HSBR1 22040 0940 BEAD DOUBLE FERRITE FB1 5 8 22109 0130 TRANSFORMER GATE DRIVE TX1 22109 0180 TRANSFORMER HF POWER TX2 22154 0160 CHOKE 1mH AXIAL 1 3 OHMS L4 5 22154 0180 CHOKE 350uH 4A L6 22154 0181 CHOKE 350uH 4A LOW LOSS L7 22154 0230 CHOKE 1 8...

Page 13: ...0F W25 MF 50PPM R35 65 66 73 98 23202 3270 RES 27K0F W25 MF 50PPM R12 23202 3330 RES 33K0F W25 MF 50PPM R71 147 150 23202 3470 RES 47K0F W25 MF 50PPM R6 23202 4100 RES 100KF W25 MF 50PPM R18 19 36 48 52 57 78 140 141 143 145 23202 4360 RES 360KF W25 MF 50PPM R133 23202 4390 RES 390KF W25 MF 50PPM R74 75 23202 4470 RES 470KF W25 MF 50PPM R53 23202 4620 RES 620KF W25 MF 50PPM R131 132 135 136 23202 ...

Page 14: ... P5 C20 21 58 59 23424 0469 CAP 220PK 1KV CER P5 C22 29 118 121 23424 0472 CAP 2N2K 1KV CER P5 P7 5 C27 28 23427 0388 CAP 220PK 100V CER P2 5 C68 23427 0389 CAP 2N2K 100V CER MED K P2 5 C17 23427 9211 CAP 470PK 100V CER MED K P2 5 C8 10 49 23557 0610 CAP 100U 50V ELEC RE2 P3 5 C32 23557 0612 CAP 1U0 100V 50V ELEC RE2 P2 C50 52 23557 0661 CAP 470U 25V ELEC RE2 P5 C23 25 23557 0673 CAP 22U 35V ELEC ...

Page 15: ...O 1N4007 B R D78 25130 0207 DIO ZEN 15V W4 D42 43 25130 0246 DIO ZEN 22V W4 D66 25130 0903 DIO ZEN 5V1 W4 D20 23 25130 0915 DIO ZEN 75V W4 D58 60 25130 0916 DIO ZEN 3V3 W4 D52 25130 9209 DIO ZEN 12V W4 D62 64 25130 9210 DIO ZEN 18V W4 D33 34 59 25131 0230 DIO ZEN 75V 1W3 D47 48 49 51 25210 0050 THYRISTOR 2N5064 SC1 25211 0301 RECTIFIER BRIDGE D20XB60 BR1 25349 3500 TRAN PNP MJE350 Q11 12 25349 421...

Page 16: ...220 RES 22R0F W25 MF 50PPM R25 125 23202 1100 RES 100RF W25 MF 50PPM R40 55 140 23202 1330 RES 330RF W25 MF 50PPM R22 122 23202 1470 RES 470RF W25 MF 50PPM R45 145 23202 1680 RES 680RF W25 MF 50PPM R2 102 23202 2100 RES 1K00F W25 MF 50PPM R10 11 12 23 48 110 111 112 123 148 23202 2360 RES 3K60F W25 MF 50PPM R147 23202 2390 RES 3K90F W25 MF 50PPM R46 146 23202 2470 RES 4K7OF W25 MF 50PPM R38 39 138...

Page 17: ...3385 2470 RES PS H 4K7 CF 6MM VR111 23385 4100 RES PS H 100K CF 6MM VR8 108 23388 0030 THERMISTOR PTC 100 OHM 265V PTC1 2 23424 0443 CAP 10NZ 1KV CER D10 P5 C30 130 23427 0323 CAP 22PJ 100V CER NPO P5 C4 5 38 104 105 23427 0329 CAP 47PG 63V CER N150 P5 C15 17 29 42 115 117 129 142 23427 0353 CAP 220PG 100V CER N750 P5T C19 119 41 141 23427 9205 CAP 47PJ 100V CER NPO P2 5 C39 139 23557 0612 CAP 1U0...

Page 18: ...27231 5740 IC 74HC574 IC6 106 27250 2001 IC MCU8 PIC16C55A 04 P ROM IC3 103 28502 0010 RESONATOR CER 4MHZ XTAL1 101 35555 2910 PCB CONTROL MECHANICAL ITEMS Part Number Description Position 10232 0425 SLEEVING H SHR 19MM BR RED FERRITE SLEEVES 20030 0263 WASHER M3 ZPST CONTROL PCB TO GROUND STANDOFFS BRACKET TO MOULDING 20030 0264 WASHER M2 5 ZPST CONTROL PCB 20030 0266 WASHER M4 ZPST EARTH 20037 0...

Page 19: ...5A 230V UK 22491 0270 MAINS LD 2M ST IEC EURO PLUG 230V EURO 22491 0040 MAINS LD 2M ST IEC USA PLUG 115V USA 22571 0691 WASHER ALUMINIUM FOR TP2E TERM GREY TERMINAL 22571 0696 TERMINAL TP 2 GREY GREY 12 22571 0740 TERMINAL TP 44 GREY RED 22571 0741 PIN ANTI ROTATION TP 44 244L 22571 0750 TERMINAL TP 44 GREY BLACK 22575 0209 SKT9W 156 20AWG YELLOW IDT OUTPUT 29211 0110 HANDLE EC254 OZ 6in BLACK NIC...

Page 20: ...Component Layouts Main Board 19 ...

Page 21: ...Control Board 20 ...

Page 22: ...Circuit Diagrams 21 ...

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Page 26: ...Thurlby Thandar Instruments Ltd Glebe Road Huntingdon Cambridgeshire PE29 7DR England Telephone 44 01480 412451 Fax 44 01480 450409 e mail sales tti test com web site www tti test com ...

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