Still looking for NEC FS-6805S help

[[email protected]]

Hi Group, still looking for help with an NEC TV with no frame drive. I
have replaced all of the electro's in the vert. stage & also the vert.
driver IC ( LA7838).
I have supply on pin 1 of 12Vdc, Pin 8 28Vdc & Pin 13 27 Vdc.
Measuring between Pin 12 (output) & Pin 11 (Gnd) in circuit is a couple
of K. On Pin 12 I have 16.66 Vdc. (no sawtooth)
I have a copy of the cicuit for the vertical output stage & also the
page with the jungle IC on it.
Any info greatly appreciated, Ian S.

 

[Franc Zabkar]

Hi Group, still looking for help with an NEC TV with no frame drive. I
have replaced all of the electro's in the vert. stage & also the vert.
driver IC ( LA7838).
I have supply on pin 1 of 12Vdc, Pin 8 28Vdc & Pin 13 27 Vdc.
Measuring between Pin 12 (output) & Pin 11 (Gnd) in circuit is a couple
of K. On Pin 12 I have 16.66 Vdc. (no sawtooth)
I have a copy of the cicuit for the vertical output stage & also the
page with the jungle IC on it.
Any info greatly appreciated, Ian S.

Do you see a good vertical trigger input on pin 2 and a ramp generator
output on pin 6? If you disconnect the yoke plug, do you still measure
a "couple of K" between pins 12 and 11?

Can you post scans of the vertical and jungle circuits on your web
space?

- Franc Zabkar

 

[[email protected]]

Do you see a good vertical trigger input on pin 2 and a ramp generator
output on pin 6? If you disconnect the yoke plug, do you still measure
a "couple of K" between pins 12 and 11?

Can you post scans of the vertical and jungle circuits on your web
space?

- Franc Zabkar

Hi Franc, Thanks for the response, I have tried to Email you by
removing one 'i' but without success. Please Email me so that I can
send the scans.
Thanks again,Ian S.