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TROUBLE SHOOTING AIDS
SWEEP
HORIZONTAL
LOSS OF SWEEP
Follow procedure outlined under " Loss of High Voltage".
INSUFFICIENT SWEEP
Check by substitution V15, V16, V17, V19 and V20. Check adjustment
of B2 and B3. Check waveform W13.
If Satisfactory
Check C78, C81, C82, R94, R96,
T2, T4A and other associated
components.
DRIVE LINES
If Unsatisfactory
Check C75, C76, C77, H85, H88,
R92 and other associated com-
ponents .
Check by substitution V15, V16 and V17. Check C75, C76, C77, C78, C81,
C82, T2, T4A and other associated circuit components for failure or change
of value.
COMPRESSED LEFT SIDE
Check by substitution V16 and V17. Check horizontal output and damper
circuit components especially T2 and T4A.
Follow procedure outlined under "Drive Lines".
XMAS TREE EFFECT
Substitute V15. Check C74, C75, L30 and other components associated with
the horizontal oscillator stage.
VERTICAL
LOSS OF SWEEP
Check by substitution V13 and V14. Check waveform W7.
If Satisfactory
Check T3, T4B, H79 and other
associated circuit components.
INSUFFICIENT SWEEP
If Unsatisfactory
| Check C62, C65, C66, B71, R75
I
and other associated components.
Check adjustment of height and vertical linearity controls. Proceed as
outlined under "Loss of Sweep".
COMPRESSED AT TOP
Check by substitution V13 and V14. Check T3, T4B, C1D and other associ-
ated circuit components.
COMPRESSED AT BOTTOM
Check by substitution V13 and V14. Check-C62, C63 and other associated
circuit components.
Substitute V13 and V14. Check components associated with these stages
for failure or change of value.
SYNC
LOSS OF HORIZONTAL AND VERTICAL SYNC
Check by substitution Vll and V12. Check C54, C58, C3 and other com-
ponents associated with Vll and V12 .
LOSS OF VERTICAL SYNC - HORIZONTAL SYNC SATISFACTORY
Check by substitution Vll, V12 , V13. Check waveform at W6.
If Satisfactory
Check components associated
with V13.
If Unsatisfactory
Check C60, R69 and other com-
ponents associated with Vll
and V12.
LOSS OF HORIZONTAL SYNC - VERTICAL SYNC SATISFACTORY
Check by substitution V12 and V15. Check components associated with
V12B and V15 especially C74 and C75.
HORIZONTAL BENDING
Check by substitution V12, V15 and V16. Check circuit
of V12, V15 and
V16 for filament lead dress short. Check horizontal AFC filter network
for component failure or change of value.
VIDEO
LOSS OF VIDEO
Substitute V6, Check associated components including picture tube.
SOUND BARS
(4. SMC Beat)
Check fins tuning adjustment. Check 4.5MC trap adjustment (A3).. Check
video IF alignment.
POOR CONTRAST
Substitute V6. Check video detector crystal and assembly. Check com-
ponents associated with these stages. Check picture tube.
NEGATIVE FIX
Substitute V6 and Vll. Check video detector crystal and assembly. Check
picture tube. Check adjustment of the "Area Control". Check AGC
network.
Check by substitution V6. Check video detector crystal and assembly. Check
C36, C38, L25, R35, R36, R37, HI, R3A, picture tube and other associated
circuit components.
WIDE BLACK BAR ACROSS FIX
Check VI, V2, V3, V4, V5 and V6 for heater to cathode leakage. Check B+
filter capacitors for open.
AUDIO
WEAK OR NO SOUND
Check by substitution V7, V8, V9 and V10. Check stages of V9B and V10 using
an audio signal generator. Apply audio signal across R52 or R3B.
If Satisfactory
Check ratio detector and audio IF
alignment and components.
If Unsatisfactory
Check components associated with
V9B and V10.
Adjust A12 for minimum buzz. If buzz is still objectionable substitute V9
and readjust All and A12. Follow procedure outlined in the alignment section.
Check by substitution V7, V8, V9 and V10. Follow procedure outlined under
"Weak or No Sound".
PAGE 12
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