EPSON Stylus Color 900 Revision C
Troubleshooting Overview 95
Table 3-27. ASF Solenoid does not Operate Table 3-28. ASF Solenoid does not Operate (continued)
Step Check Point
Action
1 Is the fuse (F4)
open?
Place the probes of the tester on the both terminals of
the chip fuse on the C265 Main board, then check for
electrical continuity. The F4 is located between CN12
and CN16 and also beside the Q9.
2 Is the transistor
(Q8) defective?
Place the probe of the oscillo scope on the collector side
of the transistor Q8 on the C265 Main board, then check
that 40 VDC is constantly applied. Then press the Load/
Eject button and check if the voltage drops to 0 VDC for
an instant. If it does, it means the Q8 is working properly.
The Q8 is located between CN12 and CN16.
Q8
20V 20
20V 20
µ
µ
Step Check Point
Action
3 Is the transistor
(Q9) defective?
Place the probe of the oscillo scope on the emittor side of
the transistor Q9 on the C265 Main board, then check
that voltage is always 0 VDC. Then press the Load/Eject
button and check for an instant change in voltage level
from 0 to 40 VDC. if it changes correctly as described
above, it means the Q9 is working properly. The Q9 is
located beside the CN16.
4 Is the C265
Main board
defective?
If the cause has not been isolated yet in the previous
steps, replace the C265 Main board.
