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NotTaR of Television Sets : Insufficient width (without hum bars)
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If there are hum bars or wiggles in the picture and/or hum in the sound, see
the section: Reduced width picture and/or hum bars in
picture and/or hum in sound.
If both width and height are affected, the cause is likely something common:
low, low voltage power supply voltages or excessive high voltage (resulting
in a 'stiffer' beam).
(From: Jerry G. (jerryg@total.net).)
Lack of width is usually caused by defective power supply, low horizontal
drive to the yoke and flyback, defective circuits in the pincushioning
amplifier section, excessive high-voltage caused by defective voltage
regulation, and or excessive loading on the secondary side of the flyback.