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Here's some info on repairing 620's. http://golddredgervideo.com/kc0wox/tek/620/ It had a crt dot but it might help you. Leonard

Hi group, I'm refurbishing a 602 with no spot visible (with Z input driven at ~ 1V). All LV voltages are good. Waiting for a high voltage probe in order to do more checks. I want to keep a spare CRT

The problem is that if the capacitor is too large it takes too long to charge up. The PSU interprets the low voltage as a failed cell, and shuts down. The required C (and R) seems to be

Two things come to mind on that. First, do not attempt to power on the 1502 immediately after plugging in the AC cord or wall wart supply. Give it a few seconds to charge the cap, then turn the 1502

Dutch Philips' main offices were in Eindhoven. Raymond

On the HV board, find Pin G, disconnect the wire and put your ammeter in-line. You should get a baseline reading when you first turn it on. As the unit warms up you should see the current draw

Eric, I’m not saying that I am 100% correct about this, it just sounds exactly like what my unit did as well. -- Michael Lynch Dardanelle, AR

That is my guess as to the problem. Mine did exactly the same thing. I have a very old one and a very late model one as well. The old one had the Brown transformer, the new unit has the Black one.

Ignacio, Oops! Fumble fingers here. The correction has been made. Thanks!! Greg Ignatio EB4APL mentioned: Greg, After searching for your album, I realized that there is typing error in the

This one does for sure the brown potted one. The serial number is 22XXX. I would have never guessed that one would have spent the night banging my head agents the power supply. Is there a test I can

That mostly black film is a tooling film for making photosensitive prints by contact probably. It's what patterned the resist for an aluminum anodized front panel. FOR HOVEN MOD MONTEK must mean it

HV transformer is going out. Look to see if it has the brown encapsulated HV transformer. -- Michael Lynch Dardanelle, AR

I purchased these Tektronix photos on Mylar from eBay. I would appreciate it if someone out there could shed any light on purpose, origin, etc. The listing has good photos so I won’t try to post any

Working in the low voltage section of the 576. This is an older low voltage board all gold traces. The power supply keeps resetting itself. I was monitoring the -75 volt rail yesterday and it was rock

Don't be surprised if this turns out to be Tek-made - you may be able to tell by the boards, parts, and construction techniques. Tek did work with LCDs in the late 1980s to early 1990s. The well known

When I was putting mine back together a while ago after fixing a HV issue, I had the IEC extender that's screwed into the cabinet just fall apart on me. I was able to use the terminal pieces to

Success. After using the bench supply, and giving the unit a couple of minutes to warm up, I started rotating the intensity control. As I swept to the upper end, I could see evidence of a trace,

Greg, After searching for your album, I realized that there is typing error in the name, "Tex" instead of "Tek" Regards, Ignacio

On 12/12/2019 11:59 AM, Mark Pilant wrote: > Hi Tom. > Got around to testing the 1502 using a bench supply.? As you suggested, > when hooked up, the 1502 power supply started operating as expected.?

Make that horizontal sweep set way too slow. (Not trace :-) - Mark N1VQW