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O. Switching Regulator Unit
Kl
~+85V
Check if each output appears
K2~+24V
Cl
~
Refer to Table 1
1
i
)
l
No output anywhere
I
No regular output at Cl
I
No output at K2 only
I
I
Turn the power switch off and wait 1 &-30 seconds.
Disconnect Kl, K2, K3, K4 and Insert the dammy
*1
*2
resister so that rated current is added between K3-K 1
and K3-K2. (Figure 1) Next turn the power on and
check that 85V appears at Kl.
Yes
Al, A2
No
Check that F601 is off
I
Yes
C601,C602,D601,C605,C628
IC601, IC602, R624, R632, D606
No
TR602, C615
Failure
Check that R601 is off
J
Yes
Failure
I
CR601, ZD603
No
Check that R604 is off
I
Yes
PC601, ZD601, D653, D654, ZD651
C610, C611, TR601, TR651
No
Failure
Turn the power switch on and check
that about 5V appears at both ends
of R609.
Yes
PC601,D651,D652,C651,C652
C654, IC601, TR602, TR651, T601
No
C653
Failure
D602, R615, R614, R630, 1C601
D603, TR601, CR602
Failure
-55-
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