Epson Stylus COLOR 900 Service Manual page 84

EPSON Stylus COLOR 900/900N
Table 3-26. ASF Solenoid Does Not Operate
Step Problem
1 Is fuse F4 Place the meter's probes on both terminals of the chip
open? fuse on the C265 Main board, then check for electrical
continuity. Fuse F4 is located between CN12 and CN16
and also beside Q9.
2 Is transistor Q8 Place the probe of the oscilloscope on the collector side
defective? of transistor Q8 on the C265 Main board, and then check
that the voltage holds steady at 40 VDC. (Q8 is located
between CN12 and CN16.) Then press the Load/Eject
button and check if the voltage drops briefly to 0 VDC. If
it does, it means that Q8 is working properly.
Solution
Q 8
µ
2 0 V 2 0
µ
2 0 V 2 0
Table 3-27. ASF Solenoid Does Not Operate (continued)
Step Problem
3 Is transistor Q9 Place the probe of the oscilloscope on the emitter side of
defective? transistor Q9 on the C265 Main board, and then check
that no voltage is present. (Q9 is located beside CN16.)
Then press the Load/Eject button and check that the
voltage jumps to 40 VDC. If it does, then Q9 is working
properly.
4 Is the C265 If you haven't isolated the problem in the previous steps,
Main board replace the C265 Main board.
defective?
Chapter 3 Troubleshooting
Solution
Q 9
µ
2 0 V 2 0
µ
2 0 V 2 0
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