Power Supply of PowerMac 7600 need recapped

[lundpk]

The power supply on my vintage Power Mac 7600 must have given up the ghost. It worked for a month in the machine and now has sadly become non-functional. So, the PSU is removed for an examination and recapping. I will need to get a list of those capacitors.

 

[lundpk]

Look like the use of some white adhesive.

 

[ArjenCNX]

I can already see that IC1/TOP200YAI is dead, R4, the fusable resistor is blown, meaning that IC1 is dead. this is the self switching fet for the standby powersupply, what you have there is 2 PSU's, one for standby and one for power. this is a common fault, sometimes caused by an issue further down the line. i have just recapped 3 of these, and caps were all not leaky and measured OK, one unit had the same fault, R4 blown and IC1 blown. i did not find any further issues with it, as in caps all good, checked all diodes/transistors and no fault was found, ill report back once i have my replacement TOP200YAI in.

 

[ArjenCNX]

Caps needed:

- 16V 2200uF 4X
- 16V 1000uF 2X
- 35V 470uF 1X
- 25V 470uF 1X
- 25V 47uF 3X
- 50V 2.2uF 1X
- 35V 100uF 1X
- 25V 100uF 2X
- 50V 47uF 1X
- 50V 1uF 2X
- 50V 10uF 1X

if you can get it include the TOP200YAI and replace it, it seems sensitive.