Baird M676: Frame Cramp

You are here:
< Back
Fault

Very poor field linearity, lack of height, field locked up at one end of the control with bounce.

Tried fitting a new PCL805, replaced C163, C168, C172,C176, C169, C164 and C175. Checked R131, R132, R155, R144 and replaced interlace diode x11. Height linearity and form control all operate but cannot correct the scan fault.

Solution

Checked and found the thermistor in the field scan coils to be open circuit, all the scan current going though the 15 ohm resistor. Shorting out the thermistor resulted in full restoration of field scan. The thermistor does need replacing, if left out of circuit the field scan may be reduced in height by about ½” when the scan coils are fully warmed up.

Table of Contents

Leave a comment

I have read the privacy policy and accept
Read our privacy policy

This form collects your name, email and content so that we can keep track of the comments placed on the website. For more info check our privacy policy where you will get more info on where, how and why we store your data.

This site uses Akismet to reduce spam. Learn how your comment data is processed.