Re: HMV 1920 made in 1960.
Good progress today. The FM tuner is working after more work done on the tuner module.
Discovered that the fine tuner control has to be moved to the right to engage with the tuning gears. I was of the opinion that the fine tuner was a push and turn control. Now I have a picture with bad frame linearity. After replacing four capacitors in the frame timebase the linearity is greatly improved, although more work needs to be done to secure better results.
The CRT is past it's best for sure but the contrast control has limited effect. More video drive will help to improve matters. An improvement can be gained by replacing the 3.9Megohm resistor R66 which is connected to the slider of the contrast control and the vision AGC circuits. It's most likely the resistor has gone high value.
Will return to the set tomorrow to fix the low contrast fault.
DFWB.
|