service Manual
Troubleshooting
Table 5-5. OPERATE LED Does Not Light
Cause
Step
Checkpoint
Finding
Solution
Connector
on the
Is connector
on the
Connect
on
board maybe
1
board
Yes
disconnected.
disconnected?
board.
Connector
on the
Is connector
on the
Connect
on
board maybe
2
board
Yes
disconnected.
disconnected?
board.
Disconnect connector
on the
OPERATE switch may be
board and check the
No
Replace the
bad.
OPERATE switch using a
OPERATE switch.
Is the switch
The fuse on the
board may have
4
Has the fuse blown on the
board?
Yes
Replace the fuse.
blown.
With the power on, is there
The
board
an output of +5 VDC
between pin 7 (+) and
No
Replace the
may be dead.
pin 5 (-) for
on
board
board?
Disconnect
on the
MAIN board and use
a.
to check the
coil resistance between: pin
2 and pin 4, and pin 1 and
Replace the CR
pin 3(2 points total) on the
Yes
motor and follow
disconnected cable side.
the steps below to
Pin 2- Pin 4
check the driver.
Pin 1- Pin 3
Are the coils of CR motor
shorted?
If any coil is shorted, check
The coils of CR motor are
the CR motor driver circuit
shorted.
using the following
procedure:
1. Set the
to
resistance check mode.
2. Place the (–) terminal of
the
on pins 1,
Replace the CR
2,3, and 4 of connector
No
motor and
on the
MAIN
MAIN board at the
board.
same time.
3. Place the
terminal on
pin 6 of connector
on the
MAIN board
With the power off, does the
detect “co”?
Rev.
Содержание ES-1200C Pro PC
Страница 2: ...EPSON IMAGE SCANNER GT 9000 ES 1200C SERVICE MANUAL EPSON ...
Страница 6: ...REVISION SHEET Revision Issue Date Revision Page Rev A June 29 1994 let issue o j c1 v ...
Страница 66: ...Chapter 4 Adjustments No Adjustment is required in this product ...
Страница 77: ...Troubleshooting GT4XNM ES 1 Savlca Mmu Table 5 15 Repair of the Main Controi Board Continued 5 1o Rev A I ...
Страница 80: ... ...
Страница 89: ...a g I 1 1 u In o N 7 g m N x In g Figure A 4 B027 PSE Board Circuit Diagram A 10 Rev A ...
