Epson Stylus PHOTO 2000P Service Manual page 72

EPSON Stylus PHOTO 2000P
Table 3-15. Cleaning Does not Solve the Problem (continued)
Step Checkpoint Action
7 Check if the head Remove the head FFC holder from the CR unit,
FFCs have come off and check that both FFCs are properly
the printhead. connected. Even if they appear to be properly
connected (not slant), try disconnecting and
then connecting them.
8 Check if the head The common driver transistors Q3 and Q4 are
driver is defective. attached the heat sink on the main board. To
check their conditions, check the sawtooth
waveform at the emitter terminals the
transistors using an oscilloscope.
TROUBLESHOOTING
Head FFCs
Head Board
Q 4 Q 3
+
+
E
B
B E
2 0 V 2 m
tr32
Table 3-15. Cleaning Does not Solve the Problem (continued)
Step Checkpoint
9 Check if the pre-
driver IC (IC10,
IC11, or IC13) is
defective.
Overview
Revision A
Action
If the waveform is not output in the previous
step, check for the waveform at the base of Q3
and Q4. Check for the sawtooth waveform
output from the pre-driver IC.
• If the correct waveform is output, transistor
Q3/Q4 is defective.
• If the correct waveform is not output, the pre-
driver IC is defective.
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