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Fault Tracing Diagram - Power Supply
Switched mode power
supply defect., +A is
missing or level wrong
Fuse
$6001 defective
D621, C601,
C602, C626
T7644 short circuit,
+5VD, +9V, RL1831
voltage. at
IC631-(3)
<1V
R633, R621
C633, 1C631
D653
Start-upvoltage
IC630-(6)
< 8V
Check D681, D682,
D683, R653, 7572
for short circuit
Start-up
voltage ca. 8V
pulsates
Control range of
switched-mode power
supply 190-264V
-19-
Important Service Note:
Before changing a component in the
Primary Mains Stage it is imperative,
that C626 is discharged by a resistor
of approx. 1002.
Attention! A short circuit transistor
T644 can be a result of a defective
D681, D682, D683, or resistor
R632
If the transistor T568 is defective
disconnect the yoke plug andtoad
the +A voltage with a resistance
of 500-1000Q instead (40-69W
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