2 Dec
2014
2 Dec
'14
11:50 a.m.
Do you have a URL for this manual? I might give
it a look and see if I can deduce anything.
I found it here:
http://elektrotanya.com/aoc_adc_commodore_1950_cm314_monitor.pdf/download.h…
I'll appreciate any insight you might offer, because I'm not very good at making
sense of monitor circuitry yet.
My first suspect is IC401, followed by possibly IC402 or IC553.
You're right: It's an AOC CM314. I'll try calling AOC shortly on the slim
chance that some old-timer might have a
dusty pile of documentation in his or her office. If not, one of the notable surplus
dealers on our list has
contacted me about possibly supplying a working monitor. Finally, there's a 1950 on
eBay, but I'll look for
cheaper options first.
AOC is 'Admiral of China' IIRC. I remember reading about US-made Admiral radios
and TVs from the
1950s. I guess this is a far eastern company that got the name.
To me IC401 looks like a sync processor/oscillator. IC402 looks like the vertical output
stage.
I think pin 2 of IC402 is the output, pin 4 may well be the drive input (maybe a ramp
voltage
here? D404 and C410 may well be that boost circuit I mentioned and are worth checking
first.
Maybe then change IC402 if you can get one.
-tony
--
Mark J. Blair, NF6X <nf6x at nf6x.net>
http://www.nf6x.net/