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John and others, I have a 547 and a 545B that I plan to run for a long time. One of the two late 1A1 plugins I have has low gain in one chancel. Not diagnosed yet. Have had other scopes of that era

In one of your earlier posts you said you had seen spiking behaviour on pin 3 of U1624. This will drive larger spikes from the output pin via Q1614 and C1602 into the protection circuitry and can very

Took up Fred's suggestion and connected -5V to the power supply board. Didn't crank the supply up high - tried 0.2A and then 0.4A current limit. Max draw was 333mA with all combs in and P1560/1570

Actually, nothing wrong with the touch panel, as far as I know it is working. It is a spare I acquired when I bought some other equipment. Thanks all for the help. 73 Bill

See the link to the discussion on the waveform monitor vs an scope. /g/TekScopes/message/156263 NielsenTelecom

Thanks to all that replied on this subject. I've decided to make this Tek 1480C waveform monitor free to anyone in the chicagoland area. The only testing I've done on it is to verify the current draw

614-0727-00 was only used in 11401 11402 used 614-0785-00. CSA803 used 614-0864-00. 11403A used 614-0850-00 which was only used in 11403A. Since this is a complete assy including the front panel maybe

Squeezed in a bit of time to check for shorts to ground on all the -5V points. There's no sign from my previous scope traces and multimeter probing that any of the other supplies are faulty. Long list

Hi Bill, In 11401 it was 614-0727-00/01 A9 Touch Panel Circuit Board Assembly (the IR diodes and sensors are on that board) . I feel quite sure that's the same as in my CSA803. No guarantee for your

Thanks, Dennis! I will keep my eye open for one of those. Sean

Hello Walter, I removed all pushbutton switches from the frontpanel board. I measured them and all are in an open state. I expected some to be stuck in the closed state, which would explain the not

Good history of Wavetek here. https://www.eetimes.com/document.asp?doc_id=1224975# John

If anyone here has the service manual for the 11403A digitizing scope, can you do me a favor and dig up the part number for the faceplate/circuit board that surrounds the display? Much appreciate the

Welcome in the hell of 7854 SMPS repairing GeorgeP! Your contribution is more than welcome! Can you post some relevant images of the signal present at various test points of board A12 and A23 when in

I have two of these to be repaired. A third one working. Following. What a machine is 7854! Thanks for the thread.

Another approach that has served me well with this type of "ticking" power supply is to let it tick and use a storage scope to capture what's happening "during the tick" for evaluation. Sometimes you

True enough....seems to work. Also had a recent prob with the fine freq adj...going wonky sometimes and the digital display flashing zeroes. Turned out not to be the variable capacitor at

Hi, Wiltron also made a Scalar Network Analyzer (Model 640) and they used the entire Tek 5000 series mainframe for it. It looks like they used plugin chassis parts from Tek and put their own

Hi Sean, I stand corrected. Tek did make a simple viewing hood . The 016-0260-00 was a simple 3 sided folding viewing hood for the 577, 5000 series, and the 7000 series. I'm looking at a picture of

Great timing Walter. I replied to Hans off list and even mentioned you had commented regarding the switches. I was wondering also if Gigatronics had inherited Wavetek since I read somewhere else