Printer Motor Drive Circuit - Panasonic UF-6300 Service Manual

6.2.9 Control Panel
The Control Panel consists of the Display PCB and Panel Unit, which display various status information.It is
normally interfaced to the main CPU. Keyed input signals are received by the Panel CPU and the data is
transferred to the main CPU on the SC PC Board.
The Control Panel performs the following processes simultaneously:
• Key inputting
• LED, LCD display
• Data transmission / reception
• Back Light Control
Interface to main CPU
The interfacing between the main CPU and the panel CPU are all executed with commands and responses
in the following two formats:
• Command / response (1 byte) + number of data + check sum
• Command / response (1 byte) + number of data + data 1 + data 2 ........................ + data n + check sum.
From/to
SC
PCB

6.2.10 Printer Motor Drive Circuit

Motor Drive Circuit
The Printer Motor is a 4-phase uni-polar PM-type step motor. The step signals
transmitted to IC38 (the Chopper Drive Circuit) from IC3 SHINE output ports. The chopper current is
determined by the voltage at IC38, Pin13. The Printer Motor has two speeds, Slow and Constant. The
Printer Motor is powered by a +24 VDC supply. When the interlocks are open, the +24 VDC supply is cut
off and the Printer Motor stops rotating.
13
20 characters, 2 lines, 5x8 dots control
LED, KEY scanning
PNLRD
PNLSD
PNLRST
BZCLK
+5V
8
+5VP
GND
LED (2:0)
GND
nPWSAVE
nWAKEUP
nBPNT
+24V
GND 8
SCN (9:0)
8
KIN (7:0)
Panel CPU
LEDCT (1:0)
2
LED
Key matrix
(70 keys)
PNL1 PC Board
196
Back Light
LED PC Board
(MMpA to MMnB) are