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If anyone is interested, just an update to say that the -15v problem is located on the A62 Video Amplifier board. With that board removed the CRT and controls come back to life with crisp details.

Hi Dominic. I'm in Brazil, and this this weighs more than the plane needed to fly it across the Atlantic. Good luck though with your projects. James

UPDATE: Fixed. Shorted rectifier, -15V supply. Feel like I got a real bargain. $99, included shipping.

Hi James Always interested in a repair project - am in Cheshire - so if you decide to part with the 492 then please let me know Best regards Dominic

I recently purchased a Tek 561A oscilloscope and determined that there is something wrong with the timebase plug-in. I followed the troubleshooting guide in the manual and determined that there is

Hello all I just picked up a 2246 scope that won't power up. Although I'm a very experienced tech, thought I would ask for any common SMPS faults before digging in further. The +44VDC on primary

HI Teksperts I have the chance of getting my hands on a TDS684A with a discoloured screen and suspect that it mat be suffering from the degradation of the 'gel' between the CRT and LCD 'shutter'? I

So, reassembled and turned on, the unit fires up, or at least all lights and scale illumination light up, before leaving three led's and the scale illumination on, but nothing else. No response

Hi Bob and Mark, Thanks for the feedback. OK on PSU capping, might spend the dollars and give it a fresh start. OK on 2 x 4 way ribbons, makes total sense. Just read storage board latch and analog

Jurgen, Since the fuses are blown, check the solid state devices in the power supply. Replacing the condensers in the power supply is a good idea. Use high temp, low ESR and long life types like

Hi all, after a long time I switched on my 2784 and it was running for several minutes without CRT Image. Then the internal Fuse and the fuse of power outlet was blown. I think LED 10, 11 and 12 did

Hi Gerald, The PSU heat is dissipated, when in the case, by the screw through the case making a thermal connection to the outer case. Maybe not the best idea Tek had, but it works. When you have the

In that case... Excellent! This thing was picked up very cheap at the flea market and have no idea as to it's history, however it does seem to be complete, so let's see what happens with the PSU

James, The neons are there to help discharge the condensers when it is turned off. When on, the limiting resistor makes the combination of the R and Ne a relaxation oscillator. These blinking when on

Aneesh, Removing the ribbon connector while on could cause the IC to be defective causing a spike to damage the mosfet(s) in the upper part of the schematic. C807 could be shorted. Q802 could be bad

Gerald, Replacing the condensers in the power supply may make the temperature drop. The originals likely will be 85C. Nichicon UHE and UCY for the 100V supply are excellent replacements. Raising the

Hi All, I am in the process of alignment after an extensive repair process of a very clean 2232. I have several questions, hopefully some answers:- 1. Does the rear right side, PSU section get

Hi Jurgen, If ok with you, let's take this offline for now. Drop me a PM, any development can be shared in the future. Regards Gerald VK3GM

Quick progress report; ..is that with the unit open on the bench, and with two 2SC4430's (the BUV48A's were overpriced in the shop) in place of the 151-0703-00's then the voltage rails are once

Hi Albert. If I was fairly confident that I had the correct pin-out, you've made me certain. Many thanks