Konica Minolta 7075/FORCE 75, Service Manual

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2 - G - 5
DEVELOPING UNIT
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