Service manual

8. Drawer drive circuit
Fig. 8-1
The drawer is directly supported by the CPU. No action starts when
the power supply is not steady as the output stage of the driver is
pulled VP by VRESC signal.
Drawer open and close is sensed with the microswitch provided in the
drawer whose signal is level converted with R74 and R73 and directly
read by the CPU.
9. Key, display, timer, buzzer controls
The keys, switches, displays, timer/calendar, and buzzer are con-
trolled by the CKDC-4 on the display PWB.
Block diagram
Fig. 9-1
DR0 DRAW0
52
50 DOSP
C86
1000P
R74
1K
TD62308F
R73 4.7K
51
DR1
DRAW1
VRESC
CPU
+24V
Drawer
solenoid
+24V
R72
47K
IRQ
SHEN
STH
HTS
SCK
POFF
STOP
SRES
CKDCR
HOST
SYSTEM
7SEG-DISPLAY 10DIG DOT-DISPLAY 12DIG
G1~G10
SA~SG
P0,1,4
CKDC 6
P2,3
DIG00 DIG11 POT00 POT35
DOT DISP CONT.
M66004FP
SRES,DCS,DSCK,DSO
ST0~3
KEX0,1
DECODER
LS138
DECODER
LS138
DECODER
HC153
DECODER
HC153
DISPSL
SKRO
Q
BUZZ
BUZZER
CSFR
MODR
KR0~3
7SEG-DISPLAY 7DIG Pop-up display
KEY BOARD
MAX. 128key
+ Paper feed key
(R and J)
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