Related Service Call Condltions - Ricoh FT5540 Service Manual

4-Bit Bias Control Signal
BIT 4
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
NOTE: SP34 shifts the bias under all conditions. There are three settings: 0, 60, and 120.
5.7 RELATED SERVICE CALL CONDITIONS
Code #31: Drum Thermistor Blown
Definition:
Lights when the drum thermistor circuit is open.
Points to Check:
Check the resistance between CN36-3 and CN36-D on the ID sensor board.
(Reference value: 10 kohms at 25°C)
Check CN103-13 on the main PCB.
BIT 3 BIT 2
0 0
0 0
0 1
0 1
1 0
1 0
1 1
1 1
0 0
0 0
0 1
0 1
1
0
1
0
1 1
1 1
BIT 1
Bias Output
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1 710
2-37
31 August 1989
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