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I checked the base of Q 401 with a scope, and it was not pulsing. I was going crazy checking everything, except the obvious. I took it to a buddy for fresh eyes. He determined at some time the drop down remote control board was plugged in back wards ( at no time did I disconnect it so it was...

R 416 is the 5 watt 2.8 K Sand resister. The original was reading 2.3 k so replaced it already. It does get very hot, I measured 128 degree C and still climbing. Collector of Q 401 coming off of transformer was at zero point 121 vdc. If I understand things correctly I believe my problem has...

First off Ohmerone, thank you for all of your replies. I tried lifting D401 it made no difference. On my version R607 is R416, with Q401 in the circuit, i measure 116.4 on one side and 1.72 vdc on the other. I checked Q401 in circuit and out and it checks good. When i checked R416 with Q401 out...

I am sorry this monitor got filed away for a bit just pulled it back out to try and tackle again. First off I installed a Zannen cap kit, and replaced IC 401. Off of pin 6 I only have 2.16 V DC. Off of pin 10 I have 3.97 V DC but it does not seem to oscillate. If I measure between R 416 and R...

repair By any chance did you ever find out what the problem was ? I have a monitor doing the same thing. But if I lift D361 disabling X ray protection. It works great. I cant find any adjustment for High Voltage.

Did you ever get it working ? I have one doing the same thing. I have already tried a cap kit.

Thank you Ohmerone, but the 1420 and 1403 are different. But you are correct my oscillator is not running.

Thank you for your reply Ken, I did check the resistors mentioned in your guide and they all checked fine. My problem appears to be further along, I do have my B+ at the collector of Q 402.

Looking for some help with a Wico Sum-20c that was made by Kortek. I have no high voltage. B+ is running at 117 off of collector of Q402 (horizontal output) but nothing on base or emitter Can anybody tell me what i should have at collector of Q401 ? Or any suggestions ?