Epson 2000P - Stylus Photo Color Inkjet Printer, Service Manual

Page: 72 / 178

EPSON Stylus PHOTO 2000P Revision A
TROUBLESHOOTING Overview 72
7 Check if the head
FFCs have come off
the printhead. Remove the head FFC holder from the CR unit,
and check that both FFCs are properly
connected. Even if they appear to be properly
connected (not slant), try disconnecting and
then connecting them.
8 Check if the head
driver is defective. The common driver transistors Q3 and Q4 are
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.
Table 3-15. Cleaning Does not Solve the Problem (continued)
Step Checkpoint Action
Head FFCs
Head Board
Q 4
Q 3
B
2 0 V 2 m
B
E
E
+
+
tr32
9 Check if the pre-
driver IC (IC10,
IC11, or IC13) is
defective. 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.
Table 3-15. Cleaning Does not Solve the Problem (continued)
Step Checkpoint Action