Products > Test Equipment
Topward 6603A Linear Power Supply Teardown
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AlphZeta:
Those are not Zener diodes, they are just 1N4148's for clamping the input into the OpAmp.
anton74:

--- Quote from: AlphZeta on June 23, 2015, 05:07:00 pm ---Those are not Zener diodes, they are just 1N4148's for clamping the input into the OpAmp.

--- End quote ---

I thought these are zeners since on the PCB they are labeled as ZD1 and ZD2 while other diodes are labeled as D1, D2, etc.  Are there any zeners on the board of 6603A?  I asked Topward for the service manual but did not receive any answer. 
AlphZeta:
Maybe I was looking at a different TL084. What's the IC number where the diodes were located? I can take a look for sure if you can check just make sure we are looking at the same diodes.
free_electron:
these are pretty good supplies. they are the OEM for the older tektronix supplies.

but like many taiwanese they suffer from the 'lets see how many miles of wires and connectors we can cram into this design
anton74:
I encircled 3 diodes on your picture, I think the ZD1 on my board corresponds to the encircled diode on the left side of your PCB, while the ZD2 is probably one of the two diodes on the right side of your PCB.

Thanks a lot.

Anton.
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