Motor Drive Section - Panasonic KX MC6020 - Color Laser - All-in-One Service Manual

KX-MC6020HX
6.7.

Motor Drive Section

6.7.1. Engine Motor Control Circuit
6.7.1.1. BK Motor Control Circuit
1. Functions
This circuit is used for driving the BK motor which supplies the rotation to the monochrome drum cartridge, black toner car-
tridges, accumulator unit, paper feed unit ,and fuser unit. The BK motor control signals are explained as follows.
2. Circuit Operation
NITMON :
This signal is the control signal for the BK motor. To rotate the BK motor, IC600 outputs the low level NITMON from pin
H20 of IC600 to IC760 (pin 1). This signal is sent to the BK motor control circuit through IC760, connector CN760. When
the signal NITMON (pin 6 of CN760) becomes a low, the BK motor starts to rotate.
ITMCLK :
This is the external clock for the BK motor. At 600 dpi monochrome printing and color printing, this value is 1656.01 Hz
(1987.212 rpm). At 1,200 dpi monochrome printing and color printing, this value is 667.7458 Hz (801.295 rpm).
NITMLD :
This is the BK motor speed detection signal sent from the BK motor drive in the BK motor. The BK motor is kept at a con-
stant speed (600 dpi printing : 1987.212 rpm, 1,200 dpi printing : 801.295 rpm). When the BK motor speed is not a proper
constant speed, this NITMLD signal (pin 5 of CN760) is a high. IC600 receives this high level NITMLD signal, and the error
message "CALL SERVICE 5" is displayed on the LCD display. (Refer to CALL SERVICE 5) (P.192)
ITMG :
This is the BK motor gain control signal to control the BK motor speed. This signal ITMG is sent from pin J18 of IC600 to
the BK motor through IC760 and connector CN760. When pin 8 of connector CN760 is a low, the gain adjustment for 600
dpi printing mode is done by the BK motor drive circuit in the BK motor. When pin 8 of CN760 is a high, the gain adjust-
ment for 1,200 dpi printing mode is done.
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