Epson GT-7000 Service Manual page 31

EPSON GT-7000
Table 3-4. "OPERATE" Light does not come on.
Cause Step Checkpoint
Connector CN1 on 1 Is the connector
the power board is CN1 on the power
disconnected. board
disconnected?
Connector CN101 or 2 Is the connector
CN102 on the power CN101 or CN102
board disconnected. on the power board
disconnected?
Fuse on the power 3 Has the fuse on the
board has blown out. power board blown
out?
The power board.is 4 With the scanner
broken. On, check the
voltage output level
between pins 8/
9(+) and pins 6/7(-)
on the power
board. Is the
voltage +5VDC?
Connector CN4 on 5 Is the connector
the power board is CN4 on the control
disconnected. board
disconnected?
The control board is 6
broken.
Table 3-5. Scanner is not initialized.
Cause Step Checkpoint
Connector CN1 on 1 Is the connector
the power board is CN1 on the power
disconnected. board
disconnected?
Rev. A
Finding Solution
Yes Connect CN1
properly.
Yes Connect CN101 or
102 properly.
Yes Replace the fuse.
No Replace the power
board.
Yes Connect CN4
properly.
--- --- Replace the control
board.
Finding Solution
Yes Connect CN1
properly.
Table 3-6. Carriage Unit does not operate
Cause Step Checkpoint
Power board 1 With the scanner power on,
is broken. check the voltage output
level between the Pins 4/
5(+) and Pins 6/7 (-) for
CN101 on the power board.
Is it +24VDC?
Carriage 2 • With the scanner upper
Unit (or CR case removed, does CR
move motor move?
mechanism)
• With the CR motor
is broken.
removed, does the
carriage unit move
smoothly?
CR Motor is 3 Disconnect the connector
broken CN6 on the control board,
then using the tester, check
the coil resistance between
Pin2 and 4 and between
Pin1 and 3. Is the resistance
of 2 points about 6.2
If any motor coil is shorted,
check the CR motor drive
circuit in the order below.
1.)Set the tester on Ohms.
2.)Place the (-) lead of the
tester on any of Pins 1,2, 3
or 4 for CN1 on the control
hoard.
3.)Place the (+) lead of the
tester on Pin 6/7 for CN4 on
the control board.
With the scanner off, does
the meter show "
Control 4 ---
board is
broken.
Chapter 3 Troubleshooting
Finding Solution
No Replace the power
board.
No Check the carriage
move mechanism
and replace the
corresponding
parts or
disassemble and
assemble the part.
No Replace the CR
motor.
Ω?
No Replace the power
board.
∞
"?
--- Replace the
control board.
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