B&K467 CRT Restorer/Analyzer attempted restore

[nem]

I have the same issue as @Bad_Hambre with my 490. It is driving me nuts. It is a very clean unit that didn't really have any broken solder joints.

2BH7A continuity is OK, I have no other means of testing
Transistor Q1 checked
Rectifiers D1-D4 checked
Transformer, apart from the G2 controls the unit works fine?
Capacitors C11 & C12, replaced
Resistors (R40,) R41 & R43 checked
IC1 & IC2, removed and checked

I hate taking the thing apart, I've already broken connections to two of the lamps.

I shotgun replaced all transistors Q1-Q10. I still can't get cutoff settings to work.

I hate this thing.

But checking the Q10 transistor, it was a 2n5550.

Mine was a PN3643. I replaced it with a 2N4401.

 

[Bad_Hambre]

I have given up on mine after a while but i will be tackling it again in the mid to near future. Round 2!

I shotgun replaced all transistors Q1-Q10. I still can't get cutoff settings to work.

I hate this thing.



Mine was a PN3643. I replaced it with a 2N4401.

I wonder why the spec sheets are different from what is on the boards?
Even if servicing these units, arent you supposed to replace it with the same value?

 

[advans14]

Maybe bad pot?

 

[benime]

Has anyone had any luck finding a suitable replacement for damaged gauges? Heater/Red gauge on mine has never worked and I'm in the process of restoring mine.

I should mentioned I've searched pretty extensively; there were some NOS spares sold on ebay like 4 years ago, but I've seen nothing since. Scavenging another unit just leaves another broken unit, so it would make sense to figure out a solution.