Where is the trace finder typically located on a 453? Anywhere, centered who knows?
Dug out the 453 last week and started looking into maybe or hopefully getting it going again. It looks like the X axis is out of whack as I can see the CRT glow as I move the vertical position move up and down and all those years of owning it I have never used the Trace Finder function. The Trace Finder in Auto Trigger shows a tiny trace a little over 1/2 of a division and 2 divisions left of center with the Horizontal Position knob centered. Checked the voltages and all looked in order however I can¡¯t see any ripple but loads of noise in the order of 40 volts on the HV(-1950) and 20mv on the +75 volt supply and 15 to 20mv on the + and -12 volt supplies. Those were taken with the digital oscilloscope but did use the Fluke to confirm the voltages. That¡¯s about as far as I have gotten so far aside from poking around for several hours looking for something loose. I do have a leaky small cap on the power supply board as there is corrosion on the lead of it in the +75volt side(10uf or less). That was the only thing that looked out of place as I was quite impressed with how nice it looks inside. Only problem I had in the past was the fan bearings as one of them was making a lot of noise and had to replace them back in the late 80¡¯s.
I replaced my old 453 several years ago as I was loosing the trace on the 453. It started slowly as it took longer and longer to warm up but in the meantime I had been researching budget digitals and purchased one. Went to do some audio work about a year after purchase of the digital and it totally stunk for doing audio work. Got out the 453 and it took forever to get the old 453 going but did get the job done and chased down the problems for the stage lighting while I had it working. I found a nice Japanese 40Mhz scope at a hamfest for $20 and been using it for audio work and does a fine job. I purchased the 453 in 1980 after I graduated High school and has been like a family member.
I am new to the group and have been enjoying the research as I recently acquired a 7854.
Take care
Pat
KD4OBQ