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Only
Blanking
is present
Y/ 100
B- Y/ 100, R- Y/ 100
on the Feature
Box
VG-Pulse
Contact 22
Vertical- Pulse
Contact 32
Contact 29
Signal on
FBAS-Encoder
plug "VE" 3,5,7
Blanking is
present
JL 5Vsg
Picture Tube Panel.
Picture Tube defective
Feature Box
defective
Vertical protection stage
T 422, T 426 possibly
defective
Line Transformer or
Picture Tube
defective
Measure on Pin 29 Feature Box
Blanking SSC < 3,6 V
Drive: Switch off + Blanking SSC 2 4,5 V
(Measured from zero line to positive pulse peak)
140V U cat (CRT)
Feature Box
defective
FBAS-Encoder def.;
Pin 18, VT / Strobe
"HIGH";
Fault tracing diagram
23
Signalverlauf im 100Hz Gerat
Signal path in 100 Hz receivers
IC 555
O/W-Endstufe
E/W Output stage
VT-Decoder
Teletext-Dec.
18 19 20 21
1
Vert. Ablenkung
Deflection
PIP-Baustein
PIP Modul
Zeilenendstufe
Line out put stage
ol
T504, T572
Buchsenplatte
Socket Board
SP
7
5
3
Bildrohrplatte
CRT Base
24
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