Sharp ER-A850 (serv.man2) Service Manual ▷ View online
2) BIOS ROM Check
1
Check contents
The reference ID of the BOIS ROM is displayed as follows:
The reference ID of the BOIS ROM is displayed as follows:
F000: FFC0
∼
FFCFH
+0
+1
+2
+3
+4
+5
+6
+7
+8
+9
+A
+B
+C
+D
+E
+F
"S"
"H"
"P"
"E"
"R"
A4H
50H
00H
"A"
"A"
94H
11H
01H
10H
"A"
00H
Sharp ID
ER-A850/A880
Reserved
ROM code
Year
Month
Day
Version
Reserved
2
Display
BIOS ROM Check
ROM Version
:
E R A 4 5 0 A A 9 4 1 1 0 1 1 0 A
ER-45X
Year/Month/Day
ROM code
Version
3
Exiting
After displaying the check result, pressing the Esc key will exit
from this check mode.
After displaying the check result, pressing the Esc key will exit
from this check mode.
3-5. Real Time Clock & CMOS RAM Diagnostics
This diagnostics is used to check the real time clock and the CMOS
RAM.
The display shows the following menu. The highlighted cursor is
moved with the cursor up key (
RAM.
The display shows the following menu. The highlighted cursor is
moved with the cursor up key (
↑
) and the cursor down key (
↓
) of the
AT key. Move the cursor to the diagnostics item to be executed, then
press the Enter key, and the selected individual diagnostics program
will be executed. After completion of an individual diagnostics pro-
gram, the display returns to the menu screen. To exit from the diag-
nostics mode, press the Esc key, and the display will return to the
service-man diagnostics menu screen.
press the Enter key, and the selected individual diagnostics program
will be executed. After completion of an individual diagnostics pro-
gram, the display returns to the menu screen. To exit from the diag-
nostics mode, press the Esc key, and the display will return to the
service-man diagnostics menu screen.
Real time clock & CMOS RAM Diagnostics
Real time clock Check
CMOS RAM Check
1) Real Time Clock Check
1
Check contents
The RTC timer function and the RTC clock function are checked.
For RTC timer check, the RTC timer is set so that an interrupt may
occur after 2 sec, and it is checked if an interrupt occurs properly.
For RTC clock check, the RTC clock is set to 1989, December 31,
23 o’clock 59 min 58 sec, and check if the clock is 1990, January
1, 0 o’clock 0 min 0 sec after 2 sec.
The RTC timer function and the RTC clock function are checked.
For RTC timer check, the RTC timer is set so that an interrupt may
occur after 2 sec, and it is checked if an interrupt occurs properly.
For RTC clock check, the RTC clock is set to 1989, December 31,
23 o’clock 59 min 58 sec, and check if the clock is 1990, January
1, 0 o’clock 0 min 0 sec after 2 sec.
2
Display
Real time clock Check
RTC Timer Check
:
PASS !! (or ERROR !!)
RTC Clock Check
:
PASS !! (or ERROR !!)
3
Exiting
After displaying the check result, pressing the Esc key will exit
from this check mode.
After displaying the check result, pressing the Esc key will exit
from this check mode.
2) CMOS RAM Check
1
Check contents
Read\write check is performed to the CMOS-RAM for set up. The
test procedures are as follows:
Read\write check is performed to the CMOS-RAM for set up. The
test procedures are as follows:
i.
Test address data is saved into the main memory.
ii.
Test data 55H is written into the test address.
iii.
The test data and the read data are compared, and test data
AAH is written into the test address.
AAH is written into the test address.
iv. The test data and the read data are compared.
v.
The saved data is written into the test area.
vi. Address is incremented until it reaches 3FH.
When a POFF interruption is made during the test, the test opera-
tion is terminated and the saved data is written into the test area
within 50ms.
tion is terminated and the saved data is written into the test area
within 50ms.
2
Display
CMOS-RAM Check
RTC RAM Extended
:
PASS !! (or ERROR !!)
Error
Address
xxxxxH
Write
Data
xxH
Read
Data
xxH
Error address and bit are displayed only when an error occurs. (If
no error occurs, they are not displayed.)
no error occurs, they are not displayed.)
3
Exiting
After displaying the check result, pressing the Esc key will exit
from this check mode.
After displaying the check result, pressing the Esc key will exit
from this check mode.
3-6. POS Keyboard Diagnostics
This diagnostics is used to check the keyboard input of the ER-
A850/A880.
The key layout of each of the ER-A850/A880 is displayed on the LCD
screen. Press keys accordingly to perform input check.
To identify the ER-A850 and the ER-A880, I/O address 3F0H is read.
If the most significant bit is "1," it is judged as the ER-A880. If "0," as
the ER-A850.
In normal communication with IOC, in the case of the ER-A880, the
touch panel key layout is displayed on the LCD screen; and in the
case of the ER-A850, the flat key layout is displayed.
In abnormal communication with IOC, "IOC ERROR" is displayed.
Pressing the Esc key will exit from this mode to return to the service-
man diagnostics menu.
A850/A880.
The key layout of each of the ER-A850/A880 is displayed on the LCD
screen. Press keys accordingly to perform input check.
To identify the ER-A850 and the ER-A880, I/O address 3F0H is read.
If the most significant bit is "1," it is judged as the ER-A880. If "0," as
the ER-A850.
In normal communication with IOC, in the case of the ER-A880, the
touch panel key layout is displayed on the LCD screen; and in the
case of the ER-A850, the flat key layout is displayed.
In abnormal communication with IOC, "IOC ERROR" is displayed.
Pressing the Esc key will exit from this mode to return to the service-
man diagnostics menu.
– 13 –
1) ER-A880 Keyboard Diagnostics
1
Check contents
Rectangular frames (10
Rectangular frames (10
×
25) are displayed on the LCD screen
according to the touch panel sensors positions. Press the touch
panel, and the catch buzzer will sound and the corresponding
frame on the LCD will be highlighted (black).
panel, and the catch buzzer will sound and the corresponding
frame on the LCD will be highlighted (black).
2
Display
3
Exiting
Pressing the Esc key will exit from this check mode.
Pressing the Esc key will exit from this check mode.
2) ER-A850 Keyboard Diagnostics
1
Check contents
Rectangular frames (13
Rectangular frames (13
×
12) are displayed on the LCD screen
according to the keyboard layout. Press the keyboard, and the
catch buzzer will sound and the corresponding frame on the LCD
will be highlighted (black).
catch buzzer will sound and the corresponding frame on the LCD
will be highlighted (black).
2
Display
3
Exiting
Pressing the Esc key will exit from this check mode.
Pressing the Esc key will exit from this check mode.
3-7. Clerk Key Diagnostics
This diagnostics is used to check the clerk key input.
If communication with IOC is abnormal, "IOC ERROR" is displayed.
Pressing the Esc key will exit from this check mode to return to the
service-man diagnostics menu.
If communication with IOC is abnormal, "IOC ERROR" is displayed.
Pressing the Esc key will exit from this check mode to return to the
service-man diagnostics menu.
1) Clerk Key Check
1
Check contents
The code of the key which is inserted into the clerk key switch is
displayed in decimal numbers.
The code of the key which is inserted into the clerk key switch is
displayed in decimal numbers.
2
Display
Clerk Key Check
Clerk Key Code
:
XXX
"XXX" shows the clerk key code.
3
Exiting
Pressing the Esc key will exit from this check mode.
Pressing the Esc key will exit from this check mode.
3-8. Printer Diagnostics
This diagnostics is used to check parallel interface of the ER-A8RS
(optional PWB).
The display shows the following menu. The highlighted cursor is
moved with the cursor up key (
(optional PWB).
The display shows the following menu. The highlighted cursor is
moved with the cursor up key (
↑
) and the cursor down key (
↓
) of the
AT key. Move the cursor to the diagnostics item to be executed, then
press the Enter key, and the selected individual diagnostics program
will be executed. After completion of an individual diagnostics pro-
gram, the display returns to the menu screen. To exit from the diag-
nostics mode, press the Esc key, and the display will return to the
service-man diagnostics menu screen.
press the Enter key, and the selected individual diagnostics program
will be executed. After completion of an individual diagnostics pro-
gram, the display returns to the menu screen. To exit from the diag-
nostics mode, press the Esc key, and the display will return to the
service-man diagnostics menu screen.
Printer Diagnostics
LPT1 Loop Check
LPT2 Loop Check
LPT3 Loop Check
LPT1 Print Check
LPT2 Print Check
LPT3 Print Check
1) LPT1 Loop Check
1
Check contents
Loop check is performed to LPT1 at I/O address 378H
Loop check is performed to LPT1 at I/O address 378H
∼
37FH.
To perform the loop check, insert an ER-A8RS to be checked to
the extension slot, insert another ER-A8RS which is operating
normally to another slot, and connect the loop cable (UKOG-
6717RCZZ) as shown in Fig. 3-3.
For the jumper setting on the PWB, refer to Fig. 3-4.
the extension slot, insert another ER-A8RS which is operating
normally to another slot, and connect the loop cable (UKOG-
6717RCZZ) as shown in Fig. 3-3.
For the jumper setting on the PWB, refer to Fig. 3-4.
Fig. 3-3 Loop Cable (UKOG-6717RCZZ) Wiring Diagram
Fig. 3-4 Jumper pin setting
The test procedures are as follows:
i.
Data 55H is written into I/O address 378H, and the same
address is read. If the read data is not 55H, "LPT1 Disabled"
is displayed and the following procedures are not performed.
address is read. If the read data is not 55H, "LPT1 Disabled"
is displayed and the following procedures are not performed.
ii.
Data 01H is written into I/O address 3BEH, and data at I/O
address 379H is read. If the read data is 47H, "AC-Signal OK"
is displayed. If not, "AC-Signal ERROR" is displayed.
address 379H is read. If the read data is 47H, "AC-Signal OK"
is displayed. If not, "AC-Signal ERROR" is displayed.
iii.
Data 02H is written into I/O address 3BEH, and data at I/O
address 379H is read. If the read data is 87H, "BUSY Signal
OK" is displayed. If not, "BUSY Signal ERROR" is displayed.
address 379H is read. If the read data is 87H, "BUSY Signal
OK" is displayed. If not, "BUSY Signal ERROR" is displayed.
10
25
1 2
1 3
Signal name Pin No.
1
STROBE-
2
DB0
3
DB1
4
DB2
5
DB3
6
DB4
7
DB5
8
DB6
9
DB7
10
ASK-
11
BUSY
12
PE
13
SLCT
14
AUTOFD-
15
ERROR
16
INIT-
17
SLCTIN-
18~25
PE
Signal name
Pin No.
1
STROBE-
2
DB0
3
DB1
4
DB2
5
DB3
6
DB4
7
DB5
8
DB6
9
DB7
10
ASK-
11
BUSY
12
PE
13
SLCT
14
AUTOFD-
15
ERROR
16
INIT-
17
SLCTIN-
18~25
PE
1
2
3
2
3
J1
9
1
0
J4
J3
1
2
3
2
3
J1
9
1
0
J4
J3
Setting ER-A8RS to be checked
Setting ER-A8RS to check
– 14 –
iv. Data 04H is written into I/O address 3BEH, and data at I/O
address 379H is read. If the read data is 37H, "PE Signal OK"
and "SLCT signal OK" are displayed. If not, "PE Signal ER-
ROR" and "SLCT Signal ERROR" are displayed.
and "SLCT signal OK" are displayed. If not, "PE Signal ER-
ROR" and "SLCT Signal ERROR" are displayed.
v.
Data 08H is written into I/O address 3BEH, and data at I/O
address 379H is read. If the read data is 0FH, "ERROR-Signal
OK" is displayed. If not, "ERROR-Signal ERROR" is dis-
played.
address 379H is read. If the read data is 0FH, "ERROR-Signal
OK" is displayed. If not, "ERROR-Signal ERROR" is dis-
played.
vi. Data 01H is written into I/O address 37AH, and data at I/O
address 3BDH is read. If the read data is 47H, "STROBE-Sig-
nal OK" is displayed. If not, "STROBE-Signal ERROR" is dis-
played.
nal OK" is displayed. If not, "STROBE-Signal ERROR" is dis-
played.
vii. Data 02H is written into I/O address 37AH, and data at I/O
address 3BDH is read. If the read data is 87H, "AUTOFD-Sig-
nal OK" is displayed. If not, "AUTOFD-Signal ERROR" is dis-
played.
nal OK" is displayed. If not, "AUTOFD-Signal ERROR" is dis-
played.
viii. Data 04H is written into I/O address 37AH, and data at I/O
address 3BDH is read. If the read data is 37H, "INIT-Signal
OK" is displayed. If not, "INIT-Signal ERROR" is displayed.
OK" is displayed. If not, "INIT-Signal ERROR" is displayed.
ix. Data 08H is written into I/O address 37AH, and data at I/O
address 3BDH is read. If the read data is 0FH, "SLCTIN-Sig-
nal OK" is displayed.
nal OK" is displayed.
x.
Data 10H is written into I/O address 37AH to generate an
interruption. If an interruption is generated, the interruption
level is displayed. If no interruption is generated, "Interrupt
ERROR" is displayed. After confirmation of an interruption,
data 00H is written into I/O address 37AH.
interruption. If an interruption is generated, the interruption
level is displayed. If no interruption is generated, "Interrupt
ERROR" is displayed. After confirmation of an interruption,
data 00H is written into I/O address 37AH.
xi. Data 55H is written into I/O address 378H, and data at I/O
address 3BCH is read. If the read data is 55H, the next check
is performed. If not, "DATA Bus ERROR" is displayed.
is performed. If not, "DATA Bus ERROR" is displayed.
xii. Data AAH is written into I/O address 378H, and data at I/O
address 3BCH is read. If the read data is AAH, "DATA Bus
OK" is displayed. If not, "DATA Bus ERROR" is displayed.
OK" is displayed. If not, "DATA Bus ERROR" is displayed.
2
Display
LPT1 Loop Check
ACK- Signal
:
PASS !! (or ERROR !!)
BUSY Signal
:
PASS !! (or ERROR !!)
PE Signal
:
PASS !! (or ERROR !!)
SLCT Signal
:
PASS !! (or ERROR !!)
ERROR- Signal
:
PASS !! (or ERROR !!)
STROBE- Signal
:
PASS !! (or ERROR !!)
AUTOFD- Signal
:
PASS !! (or ERROR !!)
INIT- Signal
:
PASS !! (or ERROR !!)
SLCTIN- Signal
:
PASS !! (or ERROR !!)
INTERRUPT
:
IRQ X (or ERROR !!)
DATA Bus
:
PASS !! (or ERROR !!)
"XX" shows the interruption level.
If LPT1 is not accessible, the display shows the following.
If LPT1 is not accessible, the display shows the following.
LPT1 Loop Check
LPT1 Channel Disabled
3
Exiting
Pressing the Esc key will exit from this check mode.
Pressing the Esc key will exit from this check mode.
2) LPT2 Loop Check
1
Check contents
Loop check is performed to LPT2 at I/O address 278H
Loop check is performed to LPT2 at I/O address 278H
∼
27FH.
To perform the loop check, insert an ER-A8RS to be checked to
the extension slot, insert another ER-A8RS which is operating
normally to another slot, and connect the loop cable as shown in
Fig. 3-3. For the jumper setting on the PWB, refer to Fig. 3-5.
the extension slot, insert another ER-A8RS which is operating
normally to another slot, and connect the loop cable as shown in
Fig. 3-3. For the jumper setting on the PWB, refer to Fig. 3-5.
Fig. 3-5 Jumper pin setting
The test procedures are as follows:
i.
Data 55H is written into I/O address 278H, and the same
address is read. If the read data is not 55H, "LPT2 Disabled"
is displayed and the following procedures are not performed.
address is read. If the read data is not 55H, "LPT2 Disabled"
is displayed and the following procedures are not performed.
ii.
Data 01H is written into I/O address 3BEH, and data at I/O
address 279H is read. If the read data is 47H, "AC-Signal OK"
is displayed. If not, "AC-Signal ERROR" is displayed.
address 279H is read. If the read data is 47H, "AC-Signal OK"
is displayed. If not, "AC-Signal ERROR" is displayed.
iii.
Data 02H is written into I/O address 3BEH, and data at I/O
address 279H is read. If the read data is 87H, "BUSY Signal
OK" is displayed. If not, "BUSY Signal ERROR" is displayed.
address 279H is read. If the read data is 87H, "BUSY Signal
OK" is displayed. If not, "BUSY Signal ERROR" is displayed.
iv. Data 04H is written into I/O address 3BEH, and data at I/O
address 279H is read. If the read data is 37H, "PE Signal OK"
and "SLCT signal OK" are displayed. If not, "PE Signal ER-
ROR" and "SLCT Signal ERROR" are displayed.
and "SLCT signal OK" are displayed. If not, "PE Signal ER-
ROR" and "SLCT Signal ERROR" are displayed.
v.
Data 08H is written into I/O address 3BEH, and data at I/O
address 279H is read. If the read data is 0FH, "ERROR-Signal
OK" is displayed. If not, "ERROR-Signal ERROR" is dis-
played.
address 279H is read. If the read data is 0FH, "ERROR-Signal
OK" is displayed. If not, "ERROR-Signal ERROR" is dis-
played.
vi. Data 01H is written into I/O address 27AH, and data at I/O
address 3BDH is read. If the read data is 47H, "STROBE-Sig-
nal OK" is displayed. If not, "STROBE-Signal ERROR" is dis-
played.
nal OK" is displayed. If not, "STROBE-Signal ERROR" is dis-
played.
vii. Data 02H is written into I/O address 27AH, and data at I/O
address 3BDH is read. If the read data is 87H, "AUTOFD-Sig-
nal OK" is displayed. If not, "AUTOFD-Signal ERROR" is dis-
played.
nal OK" is displayed. If not, "AUTOFD-Signal ERROR" is dis-
played.
viii. Data 04H is written into I/O address 27AH, and data at I/O
address 3BDH is read. If the read data is 37H, "INIT-Signal
OK" is displayed. If not, "INIT-Signal ERROR" is displayed.
OK" is displayed. If not, "INIT-Signal ERROR" is displayed.
ix. Data 08H is written into I/O address 27AH, and data at I/O
address 3BDH is read. If the read data is 0FH, "SLCTIN-Sig-
nal OK" is displayed.
nal OK" is displayed.
x.
Data 10H is written into I/O address 27AH to generate an
interruption. If an interruption is generated, the interruption
level is displayed. If no interruption is generated, "Interrupt
ERROR" is displayed. After confirmation of an interruption,
data 00H is written into I/O address 27AH.
interruption. If an interruption is generated, the interruption
level is displayed. If no interruption is generated, "Interrupt
ERROR" is displayed. After confirmation of an interruption,
data 00H is written into I/O address 27AH.
xi. Data 55H is written into I/O address 278H, and data at I/O
address 3BCH is read. If the read data is 55H, the next check
is performed. If not, "DATA Bus ERROR" is displayed.
is performed. If not, "DATA Bus ERROR" is displayed.
xii. Data AAH is written into I/O address 278H, and data at I/O
address 3BCH is read. If the read data is AAH, "DATA Bus
OK" is displayed. If not, "DATA Bus ERROR" is displayed.
OK" is displayed. If not, "DATA Bus ERROR" is displayed.
1
2
3
2
3
J1
9
1
0
J4
J3
1
2
3
2
3
J1
9
1
0
J4
J3
Setting ER-A8RS to be checked
Setting ER-A8RS to check
– 15 –
2
Display
LPT2 Loop Check
ACK- Signal
:
PASS !! (or ERROR !!)
BUSY Signal
:
PASS !! (or ERROR !!)
PE Signal
:
PASS !! (or ERROR !!)
SLCT Signal
:
PASS !! (or ERROR !!)
ERROR- Signal
:
PASS !! (or ERROR !!)
STROBE- Signal
:
PASS !! (or ERROR !!)
AUTOFD- Signal
:
PASS !! (or ERROR !!)
INIT- Signal
:
PASS !! (or ERROR !!)
SLCTIN- Signal
:
PASS !! (or ERROR !!)
INTERRUPT
:
IRQ X (or ERROR !!)
DATA Bus
:
PASS !! (or ERROR !!)
"XX" shows the interruption level.
If LPT2 is not accessible, the display shows the following.
If LPT2 is not accessible, the display shows the following.
LPT2 Loop Check
LPT2 Channel Disabled
3
Exiting
Pressing the Esc key will exit from this check mode.
Pressing the Esc key will exit from this check mode.
3) LPT3 Loop Check
1
Check contents
Loop check is performed to LPT3 at I/O address 3BCH
Loop check is performed to LPT3 at I/O address 3BCH
∼
3BEH.
To perform the loop check, insert an ER-A8RS to be checked to
the extension slot, insert another ER-A8RS which is operating
normally to another slot, and connect the loop cable as shown in
Fig. 3-3. For the jumper setting on the PWB, refer to Fig. 3-6.
the extension slot, insert another ER-A8RS which is operating
normally to another slot, and connect the loop cable as shown in
Fig. 3-3. For the jumper setting on the PWB, refer to Fig. 3-6.
Fig. 3-6 Jumper pin setting
The test procedures are as follows:
i.
Data 55H is written into I/O address 3BCH, and the same
address is read. If the read data is not 55H, "LPT3 Disabled"
is displayed and the following procedures are not performed.
address is read. If the read data is not 55H, "LPT3 Disabled"
is displayed and the following procedures are not performed.
ii.
Data 01H is written into I/O address 37AH, and data at I/O
address 3BDH is read. If the read data is 47H, "AC-Signal
OK" is displayed. If not, "AC-Signal ERROR" is displayed.
address 3BDH is read. If the read data is 47H, "AC-Signal
OK" is displayed. If not, "AC-Signal ERROR" is displayed.
iii.
Data 02H is written into I/O address 37AH, and data at I/O
address 3BDH is read. If the read data is 87H, "BUSY Signal
OK" is displayed. If not, "BUSY Signal ERROR" is displayed.
address 3BDH is read. If the read data is 87H, "BUSY Signal
OK" is displayed. If not, "BUSY Signal ERROR" is displayed.
iv. Data 04H is written into I/O address 37AH, and data at I/O
address 3BDH is read. If the read data is 37H, "PE Signal OK"
and "SLCT signal OK" are displayed. If not, "PE Signal ER-
ROR" and "SLCT Signal ERROR" are displayed.
and "SLCT signal OK" are displayed. If not, "PE Signal ER-
ROR" and "SLCT Signal ERROR" are displayed.
v.
Data 08H is written into I/O address 37AH, and data at I/O
address 3BDH is read. If the read data is 0FH, "ERROR-Sig-
nal OK" is displayed. If not, "ERROR-Signal ERROR" is dis-
played.
address 3BDH is read. If the read data is 0FH, "ERROR-Sig-
nal OK" is displayed. If not, "ERROR-Signal ERROR" is dis-
played.
vi. Data 01H is written into I/O address 3BEH, and data at I/O
address 379H is read. If the read data is 47H, "STROBE-Sig-
nal OK" is displayed. If not, "STROBE-Signal ERROR" is dis-
played.
nal OK" is displayed. If not, "STROBE-Signal ERROR" is dis-
played.
vii. Data 02H is written into I/O address 3BEH, and data at I/O
address 379H is read. If the read data is 87H, "AUTOFD-Sig-
nal OK" is displayed. If not, "AUTOFD-Signal ERROR" is dis-
played.
nal OK" is displayed. If not, "AUTOFD-Signal ERROR" is dis-
played.
viii. Data 04H is written into I/O address 3BEH, and data at I/O
address 379H is read. If the read data is 37H, "INIT-Signal
OK" is displayed. If not, "INIT-Signal ERROR" is displayed.
OK" is displayed. If not, "INIT-Signal ERROR" is displayed.
ix. Data 08H is written into I/O address 3BEH, and data at I/O
address 379H is read. If the read data is 0FH, "SLCTIN-Signal
OK" is displayed.
OK" is displayed.
x.
Data 10H is written into I/O address 3BEH to generate an
interruption. If an interruption is generated, the interruption
level is displayed. If no interruption is generated, "Interrupt
ERROR" is displayed. After confirmation of an interruption,
data 00H is written into I/O address 3BEH.
interruption. If an interruption is generated, the interruption
level is displayed. If no interruption is generated, "Interrupt
ERROR" is displayed. After confirmation of an interruption,
data 00H is written into I/O address 3BEH.
xi. Data 55H is written into I/O address 3BCH, and data at I/O
address 378H is read. If the read data is 55H, the next check
is performed. If not, "DATA Bus ERROR" is displayed.
is performed. If not, "DATA Bus ERROR" is displayed.
xii. Data AAH is written into I/O address 3BCH, and data at I/O
address 378H is read. If the read data is AAH, "DATA Bus
OK" is displayed. If not, "DATA Bus ERROR" is displayed.
OK" is displayed. If not, "DATA Bus ERROR" is displayed.
2
Display
LPT3 Loop Check
ACK- Signal
:
PASS !! (or ERROR !!)
BUSY Signal
:
PASS !! (or ERROR !!)
PE Signal
:
PASS !! (or ERROR !!)
SLCT Signal
:
PASS !! (or ERROR !!)
ERROR- Signal
:
PASS !! (or ERROR !!)
STROBE- Signal
:
PASS !! (or ERROR !!)
AUTOFD- Signal
:
PASS !! (or ERROR !!)
INIT- Signal
:
PASS !! (or ERROR !!)
SLCTIN- Signal
:
PASS !! (or ERROR !!)
INTERRUPT
:
IRQ X (or ERROR !!)
DATA Bus
:
PASS !! (or ERROR !!)
"XX" shows the interruption level.
If LPT3 is not accessible, the display shows the following.
If LPT3 is not accessible, the display shows the following.
LPT3 Loop Check
LPT3 Channel Disabled
3
Exiting
Pressing the Esc key will exit from this check mode.
Pressing the Esc key will exit from this check mode.
4) LPT1 Print Check
1
Check contents
Print check is performed to LPT1 at I/O address 378H
Print check is performed to LPT1 at I/O address 378H
∼
37FH.
For print check, set the short pins of the ER-A8RS to be checked
as shown in Fig. 3-7, connect the D-Sub 25-pin connector to the
printer, and set the printer ready for print check.
as shown in Fig. 3-7, connect the D-Sub 25-pin connector to the
printer, and set the printer ready for print check.
Fig. 3-7 Jumper pin setting
The test procedures are as follows:
1
2
3
2
3
J1
9
1
0
J4
J3
1
2
3
2
3
J1
9
1
0
J4
J3
Setting ER-A8RS to be checked
Setting ER-A8RS to check
1
2
3
2
3
J1
9
1
0
J4
J3
– 16 –
Click on the first or last page to see other ER-A850 (serv.man2) service manuals if exist.