Read Sharp ER-A410 / ER-A420 (serv.man3) Service Manual online
ER-A410/ER-A420
DIAGNOSTIC PROGRAM
– 18 –
12) CPU INTERNAL RAM TEST
1
Key operation
121
3
2
Test procedure
The test program tests internal RAM (10 Kbytes) of the CPU.
The contents of memory must be stored before and after this test.
The contents of memory must be stored before and after this test.
RAM (00400H ~ 02BFFH area) is tested in the following procedure.
a) Store data in the test area.
b) Write “00H”
c) Read and compare “00H” and then write “55H”
d) Read and compare “55H” and then write “AAH”
e) Read and compare “AAH”
f)
Restore stored data
If an error occurs at a step, the error is printed.
If any error does not occur, the following addresses are checked
If any error does not occur, the following addresses are checked
in turns.
Addresses to be checked:
01000H, 01001H, 01002H, 01004H, 01008H
01010H, 01020H, 01040H, 01080H,
01010H, 01020H, 01040H, 01080H,
01100H, 01200H, 01400H, 01800H,
02000H
3
Check:
The completion print.
4
End of testing
If an error occurs, the printer outputs the error message and the
address where the error has occurred in the area
*****
.
13) FLASH ROM TEST
1
Key operation
130
3
2
Test procedure
The test program checks that the checksum of the flash ROM
(BANK0F80000H ~ FFFFFH).
(BANK0F80000H ~ FFFFFH).
The lower two digits of the checksum should be 10H. (pending)
3
Check:
The completion print.
4
End of testing
The test will automatically be terminated and the printer prints as
follows:
14) AD CONVERSION PORT TEST
1
Key operation
160
3
2
Test procedure
The test program displays the voltage of each AD conversion port.
3
End of testing
You can exit the test mode by pressing any key. The printer prints
the following.
1 6 0
15) RS232 CH1 TEST
Install the RS232 loopback connector.
1
Key operation
500
3
2
Test procedure
The test program checks the control signals.
Data communication check
A loopback test of 256-byte data between is performed.
A loopback test of 256-byte data between is performed.
DATA: $00 - $FF BAUD RATE:9600 BPS
3
Check:
The completion print.
4
End of testing
The test program ends after printing.
When the test ends normally:
121
When the test ends abnormally:
Ex – ~ –
121
*****
x = 1: Data error
x = 2: Address error
When the test ends normally:
130
ROM
********
(Model name)
********
(Version)
When the test ends
abnormally:
abnormally:
E – – ~ – –
130
ROM
********
(Model name)
********
(Version)
TL
R A M
C P U
S R V
OP display
1 2 1
TL
R O M
F L A S H
S R V
OP display
1 3 0
OUTPUT
INPUT
/ER1
/RS1
/DR1
/CI1
/CD1
/CS1
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF
OFF
ON
ON
ON
OFF
ON
ON
OFF
OFF
ON
ON
ON
ON
ON
ON
Completion print
RS TEST
OK
Error print
RS TEST
**NG**ERxx
xx
Contents of error
01
ER DR error
02
ER CI error
03
RS CD error
04
RS CD error
05
SD RD error
DATA error
06
SD RD error
DATA error/framing error
TL
T M
S R V
OP display
Display
1 6 0
=
V R F
S R V
OP display
1 6 0
=
V P T E S T
S R V
OP display
1 6 0
=
Repeat
TL
R S
T E S T
S R V
OP display
5 0 0
2 3 2
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