Epson FX 1170 - B/W Dot-matrix Printer - Page 116

Table 5-4. Repairing the BOARD ASSEMBLY, C076 PSB/PSE (Continued)
Problem
The voltage of the
+35 V line is below
thespecifiedvalue.
Cause
Q3, ICI, Pcl, PC2
Q2 is dead.
Checkpoint
Check the voltage waveforms at
Q3.
.
,
CH1=O.2V
TlME=2~s
Check the voltage waveforms at Q2.
I
I H I
CH1=2V
1 1 1 I
Solution
Replace
D3, Icl,
Pcl, PC2
ZD51.
or
Replace
Q2.
. . . .