Epson FX 1170 Service Manual - Page 117
Table, Repairing the BOARD ASSEMBLY, C076, Continued, Problem
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REV.-A Table 5-4. Repairing the BOARD ASSEMBLY, C076 PSB/PSE (Continued) Problem rhe+5Vlineisdead. Cause rhe +35 V line is ~ead. Checkpoint ;heck the +35 V line. Solution {efer to tht terns iescribed ]bove. C51 is dead. :heck the oscillation waveform (IC51 pin 5) and the {eplace switching waveform (IC51 pin 8 ) . C51. III III I I I + I II Ill I II II I I I 1 1 1 I CH1=2V CH2=20V 1 I TlME=20ps 251 or Q52 is iead. Check the switching waveform at Q52 emitter. -F Replace D51 or D52. 11111+1111 L II CH1=20V * 1 1 1 TlME=20~s I [ I 1 5-13
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REV.-A
Table
5-4.
Repairing the BOARD ASSEMBLY, C076
PSB/PSE
(Continued)
Problem
rhe+5Vlineisdead.
Cause
rhe
+35 V line is
~ead.
C51
is dead.
251
or
Q52
is
iead.
Checkpoint
;heck
the +35 V line.
:heck
the oscillation waveform
(IC51
pin 5) and the
switching waveform
(IC51
pin
8).
I
I
I
I
I
I
I
I
I
+
I
II
Ill
I
II
II
II
I
1
1
1
I
1
I
CH1=2V CH2=20V
TlME=20ps
Check the switching waveform at
Q52
emitter.
-F
1
1
1
1
1
+
1
1
1
1
L
II
CH1=20V
*
TlME=20~s
1
1
1
I
[
I
1
Solution
{efer
to
tht
terns
iescribed
]bove.
{eplace
C51.
Replace
D51
or
D52.
5-13