Panasonic KX MC6020 - Color Laser - All-in-One Service Manual page 57

3. Sequence Control
6.7.1.2. Color Motor Control Circuit
1. Functions
This circuit is used for driving the color motor which supplies the rotation to the color drum cartridge and color toner cartridges.
The color motor control signals are explained as follows :
2. Circuit Operation
NPCMON :
This signal is the control signal for the Color motor. To rotate the Color motor, IC600 outputs the low level NPCMON from
pin L20 of IC600 to IC760 ( pin 9 ). This signal is sent to the Color motor control circuit through IC760, connector CN761.
When the signal NPCMON ( pin 6 of CN761 ) becomes a low, the Color motor starts to rotate.
PCMCLK :
This is the external clock for the Color motor. At 600 dpi color printing, this value is 1656.01 Hz ( 1987.212 rpm ). At 1,200
dpi color printing, this this value is 667.7458 Hz ( 801.295 rpm ).
NPCMLD :
This is the Color motor speed detection signal sent from the Color motor drive in the Color motor. The Color motor is kept
at a constant speed ( 600 dpi color printing : 1987.212 rpm, 1,200 dpi color printing : 801.295 rpm ). When the Color motor
speed is not NPCMLD signal, and the error message "CALL SERVICE 12" is displayed on the LCD display. (Refer to
CALL SERVICE 12 (P.195)
PCMG :
This is the Color motor gain control signal to control the Color motor speed. This signal PCMG is sent from pin J20 of
IC600 to the Color motor through IC760 and connector CN761. When pin 8 of connector CN761 is a low, the gain adjust-
ment for 600 dpi printing mode is done by the color motor drive circuit in the color motor. When pin 8 of CN761 is a high,
the gain adjustment for 1,200 dpi printing mode is done.
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KX-MC6020HX