Repair Steps - AGFA Avantra 36/44 Service Manual

4.5.1.3

Repair Steps

01. Measure 220/240 V. AC to GND. If voltage is not 220/240 V., check fuse F1 on
LPB. Replace defective fuses.
02. Measure 12 V. DC voltage at X3,3(+) and X3,4(-) of LPB. If voltage is not 12 V.,
check that there is 10 V. AC at X3,1 and 3,2 of LPB.
03. Measure 18 V. AC voltage at X400 plug between pins 4 and 5. If voltage is not 18
V., check fuse F1 on LCB. Replace defective fuses.
04. Check response of temperature sensor. Replace temperature sensor if neces-
sary.
05. Check temperature sensor wiring and plug for continuity; i.e., no open or short
circuits.
06. A/D converter failure. Replace LCB PCB.
07. Check all low voltage for short circuits to chassis of machine or ground.
08. Temperature sensor not in proper mechanical position.
09. Temperature sensor not connected.
10. No feedback pulses from optical interrupter. Check function.
11. Align optical interrupter properly.
12. Input sensor electrical or mechanical defect. Activated signal constantly transmit-
ted. Verify with service code 332.
13. Diode (D1 or D2) on LPB board defective.
14. Check main fuses and replace any that are defective.
15. Heating wire inside heating element is broken.
16. Check voltage between terminals 8 and 9 (common). It should be negative. If it is
not, check tacho generator or feedback resistor. Check jumper S201.
17. +12 or -12 V. missing on PCB. Replace LMB.
18. One thyristor (SCR) short circuit.
19. Short circuit on both thyristors. Replace PCB.
20. Relay contact melted.
21. Power triac short circuit.
22. R-C network (mounted across relay contacts) in bad condition.
23. Check optical interrupter wiring and plugs for continuity; i.e., no open or short cir-
cuits.
24. Relay defective.
25. Check appropriate wiring and terminal strips.
26. Check fuses on Luth Motor Board and replace any that are defective. If fuses
continue to blow, replace board and OHM motor. Motor should be 60–80 Ωs.
27. Plug on input sensor not in correct position.
Table 4-4 Repair steps.
Section IV: On-line Processor
Maintenance 4-21