Sharp ER-A220 (serv.man2) Service Manual ▷ View online
1) Keyboard
Scan signal :
10 /S0-9 signals
Return signal :
6 P92-97 signals
The keys are read by the key matrix following the above signals.
2) Mode switch
Scan signal :
8 /S0-7 signals
Return signal :
1 P90 signal
The positions are read by the above signals.
Scan signal /S0
/S1
/S2
/S3
/S4
/S5
/S6
/S7
Mode switch
position
position
SRV
PGM (OFF) TIME REG MGR X1/Z1 X2/Z2
3) Paper feed key
Scan signal :
1 /S1 signal
Return signal :
1 P91 signal
The paper feed key is read by the above signals.
4) Head up sensor
Scan signal :
1 /S3 signal
Return signal :
1 P91 signal
The Head up sensor state is read by the above signals.
Head up sensor
Head up detected
Head up not detected
P91
Low
High
5) Receipt near end sensor
Scan signal :
1 /S4 signal
Return signal :
1 P91 signal
The receipt near end sensor state is read by the above signals.
Receipt near end sensor
Near end detected
Near end not detected
P91
Low
High
6) RS232/CI signal detection
Scan signal :
1 /S9 signal
Return signal :
1 P91 signal
The RS232/CI signal is detected by the above signals.
RS232 /CI signal
/CI signal detected
/CI signal not detected (+5V output)
P91
Low
High
7) Display
Scan signal :
10 /S0-9 signals
The above 10 scan signals are used as the following digit signals.
Digit signal :
Scan signal
/S0
/S1
/S2
/S3
/S4
/S5
/S6
/S7
/S8
/S9
Digit signal:
Front
G1’
G2’
G3’
G4’
G5’
G6’
G7’
G8’
G9’
G10’
Digit signal:
Pop-up
G1’
G2’
G3’
G4’
G5’
G6’
G7’
Segment signal : Segment signals: a, b, c, d, e, f, g, and DP are output
by the IC:74HC374, using the data bus signal:D0-7
from the CPU as an input signal and the chip select
signal:/CS3 as a latch signal.
12. RS232 circuit
The signals from the CPU are converted by the MAX211 into the RS232 level to input and output them.
The CI signal allows the output of VCC(+5V) by switching.
The CI signal allows the output of VCC(+5V) by switching.
CPU
MAX211
1
D-SUB 9pin connector
2
3
4
5
6
7
8
9
CD
RD
SD
ER
GND
DR
RS
CS
CI OR VCC(+5V)
R1IN
R2IN
T3OUT
T2OUT
R4IN
R5IN
T1OUT
R3IN
R1OUT
R2OUT
T3IN
R4OUT
T2IN
T1IN
R5OUT
R3OUT
P75
P66
P77
P67
P74
P64
P91
P76
ICP 0.5A
VCC(+5V)
/CD
RD
/SD
/ER
/DR
/RS
/CI
/S5
13. SHORT PIN setting
The ER-A220 has two SHORT PIN settings.
SHORT PIN No.
FUNCTION
DEFAULT
SP1
Switching between Normal mode/IPL mode
Normal mode
SP2
Switching RS232C No.9 pin and Cl/+5V
Cl signal
SP1 : Normal mode / IPL mode
VCC
SP1
Normal mode
IPL mode
SP2 : +5V / CI
VCC
/C
I
+5V
CI
VCC
/C
I
VCC
SP1
CHAPTER 5. TEST FUNCTION
1. General
1) This diagnostic program has been developed for diagnosing ma-
chine functions in the field. The program is contained within the
ER-A220.
The diagnostic program is stored in the CPU internal Flash mem-
The diagnostic program is stored in the CPU internal Flash mem-
ory which will be executed by the CPU (M30624FGFP) which re-
quires the following diagnostic operations :
a) Proper power supply voltages are mandatory for logic circuits
(+5V, VDD, POFF, +24V, 5.7V, 7.7V).
b) CPU input/output pins, CPU internal logic, system bus and
RAM must be working properly.
2. Operational procedure
To start the diagnostic program, you must enter the following com-
mand.
3-digit test item number key in the SRV mode
The RAM must be operating properly to go into this mode. This is
necessary because the control jumps to the program area in the SRV
necessary because the control jumps to the program area in the SRV
mode. A master reset must be performed before operating the ECR for
the first time. After any option is installed, a program reset is required.
When the master reset or program reset is performed, be sure to
When the master reset or program reset is performed, be sure to
check the printout on the journal paper.
Master reset :
Turn power on in the SRV’ mode and change it to
the SRV mode with the
PAPER FEED key
pressed.
print :
MASTER RESET ***
Program reset : Turn power on in the SRV’ mode and change it to
the SRV mode.
print :
PRG. RESET ***
3. Test command list
With the SRV mode and the following test code entry, the test start.
CODE
DESCRIPTION
100
Display & Buzzer test
101
Key code test
102
Printer test
104
Keyboard test
105
Mode switch test
106
Printer sensor test
110
Drawer open test
120
External RAM test
121
CPU internal RAM test
130
CPU internal ROM test
140
CPU internal Flash ROM test
500
RS-232 loop back test
550
Sleep mode test
4. Test contents
[1] Display & Buzzer test
1) Key operation
2) Functional description
Display the following message on the front and the rear display
boards.
Front display
Pop-up display
A decimal point shifts from lower number of digit by one digit (per
200m sec.).
Next, display the following segments (for approx. 1 sec.).
Front display
Pop-up display
Repeat the above two kinds of displays.
Sound a buzzer continuously during test.
3) Check items
a) The display must be correctly shown at each position.
b) The luminosity of displays must be uniform and even at each posi-
tion.
c) Abnormal buzzer sound is not allowed.
4) Test termination
Press any key. The test terminates with the test and message printed
[2] Key code test
1) Key operation
100
#/TM/ST
1. 2. 3. 4. 5. 6. 7. 8. 9. 0.
4. 5. 6. 7. 8. 9. 0.
8. 8. 8. 8. 8. 8. 8. 8. 8. 8.
8. 8. 8. 8. 8. 8. 8.
1 0 0
101
#/TM/ST
2) Functional description
Key code, MRS switch (not used in ER-A220) state and Cashier code
are displayed.
3) Check items
a) Key code
HARDWARE CODE" of the following keys will be displayed
ever time the keys are pressed.
"---" indicates that a key is struck twice and also that input data
"---" indicates that a key is struck twice and also that input data
is not accepted.
[KEY POSITION CODE]
4) Test termination
Change the mode switch position other than SRV position to terminate
the test.
The test terminates with the test and message printed
[3] R/J printer test
1) Key operation
2) Functional description
Display the following message.
Print the following characters.
3) Check items
a) Printed characters must be free of stain and blur.
4) Test termination
This check is terminated automatically.
[4] Keyboard test
1) Key operation
Standard keyboard layout sumcheck data
ER-A220
3383
2) Functional description
Keyboard test is performed with the sumcheck data of key code.
For sumcheck data, data are inputted to the upper four digits befor the
diagnostics code.
The data are compared with the added data which are added until the
The data are compared with the added data which are added until the
final key (TL) is pressed. if the data agree with the added data, the end
print is made. If not, the error print is made.
The sumcheck data is obtained by totalizing all key hardware codes.
The sumcheck data is obtained by totalizing all key hardware codes.
MRS switch state (Not used)
Key code
067 051 035 019 003
068 052 036 020 004
066 050 034 018 002
069 053 037 021 005
065 049 033
001
064 048 032
000
017
016
115 099 083
116 100 084
114 098 082
117 101 085
113 097 081
117 096 080
148 132
144 147 131
145 146 130
<ALL KEY>
<ER-A220 STANDARD KEY BOARD LAYOUT>
051
035 019 003
068 052 036 020 004
066 050 034
002
069 053 037
005
065 049 033
001
064 048 032
000
116 100 084
114 098 082
117 101 085
113 097 081
096
080
148 132
144 147 131
145 146 130
1 0 1
102
#/TM/ST
1 2 3 4 5 6 7 8 9 0
3 lines of Z(30 characters) are printed
ZZZZZ • • • • • • ZZZZZZ
ZZZZZ • • • • • • ZZZZZZ
ZZZZZ • • • • • • ZZZZZZ
3383 104
#/TM/ST
Sumcheck data
1 0 4
Key code
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