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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 and V16. Check adjustment Bl. Check T2, T4A,
R94, C77, C76 and other associated components.
DRIVE LINES
Check by substitution V14, V15 and V16. Check T2, T4A.R90, R94, C77
and C79. Check adjustment Bl and other associated components.
COMPRESSED LEFT SIDE
Check by substitution V15 and V16. Check horizontal output and damper
stages for component failure or change of value.
Follow procedure outlined under "Drive Lines".
PIE CRUST EFFECT
Check by substitution V13, V14, V15 and V16. Check C70 for open. Check
L30 and other associated components.
XMAS TREE EFFECT
Check by substitution V13, V14, V15, and V16. Check L30, C74, C75, C76
C77, R86, R90, R88 and R87. Check T2 and T4A for Internal arcing.
VERTICAL
LOSS OF SWEEP
Check by substitution V7 and V12. Check R3, R72,H6, H77, C57, C54,
C2D, T3, T4B and other associated components.
INSUFFICIENT SWEEP
Check by substitution V7 and V12. Check height and vertical linearity
controls for proper operation. Check T3 and T4B.
COMPRESSED AT BOTTOM
Check by substitution V7 and V12. Check R3, H75, C57 and other assoc-
iated components.
COMPRESSED AT TOP
Check by substitution V7 and V12. Check R6, R77, C2D and other associated
components.
Check by substitution V7 and V12. Check R72, C54, T3, T4B and other
associated components.
SYNC
LOSS OF VERTICAL AND HORIZONTAL SYNC
Substitute VU. Check C51, C52, RIO, R68, R66 and other associated
components.
'
t
LOSS OF VERTICAL SYNC-HORIZONTAL SYNC SATISFACTORY
Substitute V7. Check vertical integator network, check R5, R99, C55 and
other associated components.
LOSS OF HORIZONTAL SYNC-VERTICAL SYNC SATISFACTORY
Substitute V13. Check horizontal AFC network. Check'RSO, C65, C70 and
other associated components.
HORIZONTAL BENDING
Check by substitution V7, Vll and V13. Check components associated with
V13.
VIDEO
LOSS OF VIDEO
Substitute V6. Check R43, L27, R8, R49, C43 and other associated
components.
SOUND BARS (4. 5 MC BEAT)
Adjust tuner fine tuning for best sound and picture. Check adjustment
A30. Check video IF alignment.
POOR CONTRAST
Substitute V6. Check contrast control, picture tube, C43, L27 and C41.
Check video detector crystal network.
NEGATIVE PICTURE
Substitute V6. Check video detector crystal network, picture tube, C43,
C2C and R49. Check video IF alignment
Substitute V6. Check video detector crystal network. Check C43, C41,
L27, R49 and other associated component.
WIDE BLACK BAR ACROSS PICTURE
Check by substitution VI, V3, V4, V5 and V6 for heater to cathode leakage.
AUDIO
WEAK OR NO SOUND
Check by substitution V8, V9 and V10. Check stages V9 and V10 using audio
signal genator. Apply audio signal across Rl.
If Satisfactory
Check audio IF and audio detector
stages for component failure or
change of value.
If Unsatisfactory
Check C49, C50, C1C, H65, R60,
R63, speaker, T5 and other assoc-
iated components.
Adjust tuner fine tuning for best sound and picture. Check adjustments R9
and A32 for minimum buzz. If still unsatisfactory, check audio IF alignment
DISTORTED
Follow procedure outlined under "Weak or No Sound".
POWER
DEAD SET
If filaments fall to light, check AC interlock assembly. Check switch on
volume control and Tl. If filaments light, substitute V18. Check B+filter
and decoupling network.
SMALL AND/OR DIM PICTURE
Substitute V18. Check B+ filter and decoupling network.
PAGE 12
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