Hi Gang,
I want to replace my 4 Rifa caps in my HP 3478A multimeter. I have the older designed meter that has the torroid couplers and vertically mounted TO5 regulator. I already replaced the old battery, no problems. Upon looking at the Rifa caps on the board, the ones hiding under the ribbon cable that connects the HP-IB interface to the board (C720 & C721) are not to hard to get at. Removing the socketed ribbon cable, and the safety shield on the board bottom will allow them to be removed and replaced.
The other two caps (C765 & C766) are hard to even see, let alone replace. They are grouped around the power switch, the TO5 regulator, the power transformer, and wires connecting the regulator to the main board.
If anyone has any advice on getting at the caps easily, please let me know. Typically after doing a job, you find the "easy way" to do it that might not have been apparent initially. It looks to me like I need to remove the power switch. It is connected mechanically to the front panel by a long plastic shaft. It also looks like I will need to remove the regulator assembly that is screwed on the the chassis.
I want to disturb the components as little as possible, so if experience dictates a better way of doing the replacement, please feel free to chime in!!
Thanks,
Mike