So Auralflea (Kevin) contacted me about restoring this Accuphase E-202 and i thought it would make a good thread about restorating a pretty fucked up amp back to its former glory.
Properly restoring an amplifier isn't just a case of recapping it and setting the offset and bias its much more involved:-
A complete recap
All zener diodes replaced
Any out of spec transistors or any that have known problems replaced
Any out of spec or stressed resistors replaced
Adjustment pots replaced with sealed multiturns
All boards defluxed and cleaned
All switches and pots cleaned with deoxit
All solder joints inspected anf resoldered if needed
Probably a couple more i can't think of at the mo.
This amp had been with another tech for around six months with an apparent switch fault, which he could'nt rectify. Seems that it had been with a 'tech' for a while i thought the rest (not the switch) would be in tiptop shape, how wrong was I, after further inspection i have found dozens of resistors with cracked insulation only a handful of original transistors and a couple of bodged amutuer repairs.
heres some pic's and comments.....
At first glance nothing looks to off, standard japanese layout and component choices, grey Elna caps etc.
Starting to see things that arn't original, the most obvious being the RS rectifier which has replaced the original rectifier pcb. As you can see its been installed in a pain in the arse place and the pins on the big psu cap underneath have been bent to accomadate it, pretty shoddy soldering as well.
More worring soldering (Just tagged on the pins) on the circuit breaker.
Psu circuit board
The irreplacable STV diodes have been moved to the back of the board.