Epson FilmScan 200 Service Manual page 81

Step Cause
1 The power supply unit
is defective.
2 The engine mechanism
is defective.
3 The main scan motor is
defective.
4 The digital board unit is
defective.
Step Cause
1 Photo interrupter A (for main
scanning ) is defective.
Rev. A
The carrier unit does not move
Table 5-7.
Check Point
Detach CN3 on the power supply unit.
Check the CN3 is outputting the
following voltages:
(+): Pin 3 of CN3
(-): Pin 5 of CN3
Is the output voltage +24 VDC?
•Remove the upper case. Does the
main scan motor rotate at the power
switch is on ?
• Remove the main scan motor from
the engine mechanism. Does the
carrier table move smoothly?
Disconnect the CN3 on the digital board
unit then detach the following main
scan motor connector terminal by
multimeter with resistance measuring
range.
Pin 2 and Pin 4
Pin 1 and Pin 3
Is the motor coil resistance value
APPROX. 8 ohms?
If the motor coil is opened, check the
main scan motor drive circuit on the
digital board unit as follows:
a) Adjust the multimeter with
resistance measuring range.
b) Turn the scanner power off.
c) Detach the (-) terminal of the
multimeter on CN3 pins 1,2,3, and 4
of the digital board unit.
d) Detach the (+) terminal of the
multimeter on GND of the digital
board unit.
Does the multimeter detect "∞"?
arrier unit moves though Error is displayed
Table 5-8. C
--
Check Point Decision
--
TROUBLESHOOTING
Decision Solution
No Replace the power
supply board.
No Check the carrier
movement
mechanism and
decide to do
overhaul or the
entire unit
replacement.
No Replace the main
scan motor.
No Replace the main
scan motor and
the digital board
unit.
-- Replace the digital
board unit.
Solution
-- Replace the photo
interrupter A.
5-5