Products > Test Equipment
Topward 6603A Linear Power Supply Teardown
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AlphZeta:
Yep. @free_electron, these supplies are pretty difficult to service. The two boards on the front panel are soldered together and removing a board requires desoldering all the banana plugs. :(
AlphZeta:
OK, the left one (CR13) is a 9.1V Zener, the one on the top to the right CR 15 is 1N4148 and the one under it is CR7, a 5.1V Zener. But that's for the 6603A though, It's likely they are different for your 33010..
anton74:
Thanks.

anton74:
AlphZeta, could I ask another question?  What are the components responsible for the voltage regulation?  I replaced the zeners, the power supply started to work, the current regulation seems OK.  However, the voltage regulation does not work - the voltage is not affected by the potentiometer.

Thanks.
lowimpedance:
So what is the value of the measured voltage ?.
Could be a shorted pass transistor, usually at the rear on heat sinks and be a TO3 package. (2n3055 perhaps)
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