Read Sharp XE-A213 (serv.man4) Service Manual online
XE-A203V/A213V
HARDWARE DESCRIPTION
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4. DISPLAY
4-1. FRONT DISPLAY
The LCD display of 5x7dot, 2 lines, and 16 digits.
Display dot component
Display controller and LCD
4-2. REAR (POPUP) DISPLAY
Provided with the 7-digit, 7-segment LED display.
External view
5. DRAWER CONTROL
Provided with the drawer port of one channel (without an open sensor).
The drive time of the DRAWER solenoid is as follows:
50ms (max) 45ms (min)
50ms (max) 45ms (min)
6. BUZZER CONTROL
Provided with the piezo-buzzer.
7. KEY SCAN
7-1. STROBE SIGNAL AND RETURN SIGNAL
The key state and the mode key state are detected by 16 strobe signals
and 14 return signals.
and 14 return signals.
• Strobe signal
Four signals of KS0 ~ KS3 which are the base of 16 strobe signals
are assigned to the CPU port, and decoded to 16 strobe signals
externally.
are assigned to the CPU port, and decoded to 16 strobe signals
externally.
• Return signal
The twelve of the fourteen return signals are assigned to the memory
space as shown below.
space as shown below.
Return signal (KR0 ~ KR11)
Bit support
The MODR and RJR signals which are returns signals of other than
KRx are assigned to the CPU port.
KRx are assigned to the CPU port.
Function
Signal
name
CPUP
ORT
Remark
DRAWER drive signal
DRAWER
P81
The drawer is driven at H.
Function
Signal
name
CPUP
ORT
Remark
BUZZER drive signal
BUZZER
P80
The buzzer is driven at H.
㩷 㩷
8 digit
8 digit
Function
Signal
name
CPUP
ORT
Remark
Functions as POPUP
DISPLAY DIGIT signal
and as KEY STROBE
signal.
DISPLAY DIGIT signal
and as KEY STROBE
signal.
KS0
P14
With KS as MSB, KS3~KS0
are decoded to be /S0~/
S15.(KS3~KS0 are output-
ted (active) at H.)
are decoded to be /S0~/
S15.(KS3~KS0 are output-
ted (active) at H.)
KS1
P15
KS2
P16
KS3
P17
Function
Address
R/W
KEYRETURN signal (KR0 ~ KR7)
28000h (CS1 space)
R
KEYRETURN signal (KR8 ~ KR11)
28001h (CS1 space)
R
Address
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bir1
Bit0
28000h
KR7
KR6
KR5
KR4
KR3
KR2
KR1
KR0
28001h
X
X
X
X
KR11
KR10
KR9
KR8
Function
Signal
name
CPUP
ORT
Remark
Mode return signal
MODR
P60
Signal for reading the mode key
position
position
Pa p e r fe e d key
return signal
return signal
RJR
P61
Read signal for the receipt key and
the and journal key
the and journal key
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