Epson Stylus Color 980 Service Manual page 97

EPSON Stylus Color 980
Table 3-27. ASF Solenoid does not Operate
Step Check Point
1 Is the fuse (F4) Place the probes of the tester on the both terminals of
open? the chip fuse on the C380 Main board, then check for
electrical continuity. The F4 is located between CN12
and CN16 and also beside the Q9.
2 Is the transistor Place the probe of the oscillo scope on the collector side
(Q8) defective? of the transistor Q8 on the C380 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.
Troubleshooting
Action
Overview
Table 3-28. ASF Solenoid does not Operate (continued)
Step Check Point
3 Is the transistor Place the probe of the oscillo scope on the emittor side of
(Q9) defective? the transistor Q9 on the C380 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 C380 If the cause has not been isolated yet in the previous
Main board steps, replace the C380 Main board.
defective?
Revision A
Action
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