Trubleshooting of Weighing machine.
Faults
5201 CW
5201 PC
 5201LTW/5202 LPM

NO DISPLAY /
NO BEEP
OR
CONTINOUS
BEEP
Check supply at mains, fuse transformer outputs.
Check supply at mains, fuse transformer outputs.
Check supply at mains, fuse transformer outputs.
Check ON/OFF key on KBD.
Check ON/OFF key on KBD.
Check ON/OFF key on KBD.
Check regulators output +5v & -5v.
Check regulators output +5v & -5v.
Check regulators output +5v & -5v.
Check filament voltage at FIP Pins.
Check filament voltage at FIP Pins.
Check filament voltage at FIP Pins.
Replace / check EPRON, 741S138, 80C 82c55 TR Q1-3904, 80c31/80c32
Replace / check EPRON, 741S138, 80C 82c55 TR Q1-3904, 80c31/80c32.
Replace / check EPRON, 741S138, 80C
82c55 TR Q1-3904, 80c31/80c32
Check crystal 10 MHz & reset Ckt at pin 4 of CONTROLLER.
Check crystal 10 MHz & reset Ckt at pin 4 of CONTROLLER.
Check crystal 10 MHz & reset Ckt at pin 4 of CONTROLLER.
 
       

NO DISPLAY/ BEEP WORKS
Check transformer outputs.
Check transformer outputs.
Check transformer outputs.
Check filament & its voltage of FIP.
Check filament & its voltage of FIP.
Check filament & its voltage of FIP.
Check FIP & FIP pins.
Check FIP & FIP pins.
Check FIP & FIP pins.
Check zener 6.8 V/6.2 V.
Check zener 6.8 V/6.2 V.
Check zener 6.8 V/6.2 V.
Check 74 LS 138, 80C
Check 74 LS 138, 80C
Check 74 LS 138, 80C
Check connector in vial display.
Check connector in vial display.
Check connector in vial display.
 
       

NO BEEP
Check buzzer, transistor A733, 82C55
Check buzzer, transistor A733, 82C55
Check buzzer, transistor A733, 82C55
 
       

HALF ZERO FLASHING
Check regulator outputs +5v & -5v.
Check regulator outputs +5v & -5v.
Check regulator outputs +5v & -5v.
Check loadcell parameters.
Check loadcell parameters.
Check laodcell parameters.
Refer note in calibration procedure.
Refer note in calibration procedure.
Do calibration.
Do calibration.
Do calibration.
Check trinpots 20 K.
Check trinpots 20 K and 2 K.
Check trinpots 20 K and 2 K.
Check 2.5 v at pin 22 of Ad 7135.
.
Check 2.5 v at pin 15 of Ad 7710.
Check 2.5 v pin 22 of Ad 7135.
 
       

DRIFT/ FLICKRING

Check for power supply fluctuations.
Check for power supply fluctuations.
Check for power supply fluctuations.
Clean PCB with IPA.
Clean PCB with IPA.
Clean PCB with IPA.
Solder Analog section properly.
Solder Analog section properly.
Solder Analog section properly.
Replace / Check Filter, Transformer.
Replace / Check Filter, Transformer.
Replace / Check Filter, Transformer.
Check loadcell parameters.
Check loadcell parameters.
Check loadcell parameters.
Replace / Check nylar capacitor in analog section.
Replace / Check nylar capacitor in analog section.
Replace / Check nylar capacitor in analog section.
Check proper routing of L/c wire it shouldn’t pass from nearer to mains
Check proper routing of L/c wire it shouldn’t pass from nearer to mains
Check proper routing of L/c wire it shouldn’t pass from nearer to mains
Do modification adding 7805 in 5201 LPS PCB.
 
       

NON-LINEARITY
Check leveling of machine.
Check leveling of machine.
Check leveling of machine.
Confirm accuracy of weight used for calibration.
Confirm accuracy of weight used for calibration.
Confirm accuracy of weight used for calibration.
Do gain calibration.
Do gain calibration.
Do gain calibration.
Check L/c parameters.
Check L/c parameters.
Check L/c parameters.
Check 2 K Pot.
Check 2 K Pot.
Check span between full load & no load should not be bet. 30000-32000
 
       

ERRATIC DISPLAY/ BRIGHT SEG / DIGIT
Check for dry solder in digital Sec
Check for dry solder in digital Sec
Check for dry solder in digital Sec
Check display connectors.
Check display connectors.
Check display connectors.
Check crystal 10MHz, EPROM, 74HCT373
Check crystal 10MHz, EPROM, 74HCT373
Check crystal 10MHz, EPROM, 74HCT373
Check / replace 74HC138, 80C, 82c55.
Check / replace 74HC138, 80C, 82c55.
Check / replace 74HC138, 80C, 82c55.
Check EPROM 24C04.
Check EPROM 24C04.
Check EPROM 24C04.
 
 
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