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Schaitungsbeschreibung / Circuit Description
CUC 5365
Fault Tracing Diagram - Power Supply
Switched mode power
supply defect., +A is
missing or level wrong
Fuse
$6001 defective
D621, C601,
C602, C626
T644 short circuit,
attentuation. D648,
D647, R646, SI624,
+5VD, +9V, RL1831
voltage
at drain
T644
voltage. at
1C631-(3)
<1V
R633, R621
C633, 1C631
D653
Start-upvoltage
IC630-(6)
< 8V
Check D681, D682,
Start-up
D683, R653, T572
voltage ca. 8V
for short circuit
pulsates
Control range of
switched-mode power
supply 190-264V
Important Service Note:
Before changing a component in the
Primary Mains Stage it is imperative,
that C626 is discharged by a resistor
of approx. 100.
Attention! A short circuit transistor
T644 can be a result of a defective
D681, D682, D683, or resistor
R632
IC Start -
Pin6
Pin2
lf the transistor T568 is defective
disconnect the yoke plug and load
the +A voltage with a resistance
of 500-1000Q instead (40-60W
2-6
GRUNDIG Service-Technik
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