Sam4s ER-390 Series Service Manual page 78

11 Block Diagram
11-2 ER-390 / ER-390F
RECEIPT PRINTER (STM-210)
VPH
VPH
ON/OFF
VPRT
+8.5V
MOT DRIVE
LB1838
RTC
32.768Khz
SERIAL I/F
(RS232)
11-2
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POWER
P/END
TRANS
LEVER
VCC VPRT VDRV VDISP
+5V +8.5V +24V +30V
RESET
TPH_CLK, DATA
LATCH, nSTOBE
ADC nRST nINT0
CPU
M30800SFP
XIN
FS781
14.7456Mhz
FA16,17
nCS_EPROM
nCS2
FISICAL VOLT FISICAL I/F
DRIVE 82C55
12.5V 6.2V FA
( 0:15 ) ( 0:7 )
FISICAL MEMORY B'D
512K/1M/2M
SPOOL
MOTOR
DRAWER
P/fail
DETECT
SPOOL DRAWER
DRIVE DRIVE
A [0:19 ]
D [0:8 ]
EPROM
M27C4000
ADD,nCS DECODE
74HC138
ADD,nCS DECODE
74HC138
CS_KEYSCAN
KEY & MODE
SCAN RETURN
FD
SCAN RETURN
KEY BOARD
MODE KEY
REAR(10DIGIT)
FRONT(10DIGIT)
VFDDRIVE
BUZZER
BUZZER
DRIVE
SRAM
SRAM
4MBITS
2MBITS
nCS
BUFFER
74HC541
SAM4S ER-390 SERIES