Konica Minolta 7085/FORCE 85 Service Manual page 95

2. Signals
a. PRCB input signals
(1) Dmax SIG (TCSB to PRCB)
Output voltage of the Dmax value detection
sensor (PD1) on the TCSB.
Reference voltage: 2.5V
(2) Dmax MONI (TCSB to PRCB)
This signal monitors the light reflected by the
drum surface (without toner).
The voltage applied to the Dmax detection LED
is corrected by γ/Dmax LED Vref so that the
output voltage becomes 4V (calibration).
Reference voltage: 4V
<Timing->
a) Before D max correction.
(3) JAM SIG (ITCSB to PRCB)
This signal detects a jam caused by paper
wrapping around the drum. A jam is detected
when the voltage becomes 4.0V or more.
[L]: LED ON
[H]: LED OFF
b. Output signals
(1) Dmax LED CONT (PRCB to TCSB)
This signal turns ON/OFF the D max LED.
(2) Dmax LED Vref (PRCB to TCSB)
Power supply line for PD1 LED on TSCB.
The voltage is adjusted so as the Dmax MONI
signal to be 4 V.
(3) JAM LED CONT (PRCB to TCSB)
This signal turns ON/OFF the JAM LED.
[L]: LED ON
[H]: LED OFF
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DEVELOPING UNIT