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Where are you located? I think I have a complete (maybe working?) 468 in the pile of extras.

Is it adjusted using some of the VR‘s on the plug-in

Yes they are

Great reply from Jared, covers pretty much everything. I would add, unlocking 1GHz means you probably need to re-do parts of the calibration. Also I question the actual usefulness of that extra

According to both the manual and catalog from that time the TDS684A doesn't have any options that can be unlocked. Also the full 1GHz bandwidth applies only to attenuator settings 10 mV/div and

The TDS684A is definitely a 1GHz scope, running at 5G Samples/sec. Here's info on replacing the CRT with an

Are the internal voltages of the 561's power supplies all in range? Max

Hi ,Henry, What symptoms exactly does it show? If the DC voltages are out of specs, the first thing to do is to correct their values before proceeding further. Max

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