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12 February 1992
4.
TEST POINTS
4.1
MAIN CONTROL BOARD
Number
Label
TP101
(LAMP)
TP102
(DRAMTH)
TP103
(SCN-TNT)
TP104
(C GND)
TP105
(VCC)
TP106
(DRUM AC) Feedback voltage for drum current ac component
TP107
(DRUM DC) Feedback voltage for drum current dc component
TP108
(P-SEN)
TP109
(VL)
TP110
(ADS)
TP111
(I-DRUM)
TP112
(DCPOL)
TP113
(FUSER)
Exposure lamp feedback voltage
Drum thermistor reference voltage
(25°C: 2V, 35°C: 1.6V, Open: 5V, Short: 0V)
Scanner free run with exposure lamp off by
shorting TP103 and TP104.
Ground
+5V
ID sensor output
V sensor output
ADS sensor output
Feedback voltage for drum current
Reference voltage for drum current dc
component's polarity
Fusing thermistor reference voltage (Room temp:
4.8V, 185°C: 0.9V, Open: 5V, Short: 0V)
4-37
TEST POINTS
Function
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