Accuphase E-202
This unit had the typical layers of dust... the face had some minor scratches, frame and panels were excellent,
and the unit was generally very presentable.
Accuphase has a reputation for building some of the finest gear anywhere, so I was anxious to get this running.
However, I was to find that this one was not going to be an easy fix.
On my initial examination, I found that the unit would stay in protection mode. I could see the emmitter resistors
on the left channel were cracked. I could also see two other suspect resistors on this board.
On a closer look, I discover that this channel had suffered a catastrophic failure. Once I had the unit apart and
started checking components, I found the amout of damage was extensive:
and the unit was generally very presentable.
Accuphase has a reputation for building some of the finest gear anywhere, so I was anxious to get this running.
However, I was to find that this one was not going to be an easy fix.
On my initial examination, I found that the unit would stay in protection mode. I could see the emmitter resistors
on the left channel were cracked. I could also see two other suspect resistors on this board.
On a closer look, I discover that this channel had suffered a catastrophic failure. Once I had the unit apart and
started checking components, I found the amout of damage was extensive:
1) Six bad resistors
2) Two bad driver transistors
3) Two cracked emitter resistors
4) three (of the four) bad output transistors
I also discovered that the output
transistors had been soldered into the
sockets on both channels!!! Impossible to
remove without destroying the
socket/transistor. Some hack had been
working on this... Bad Karma. I hate getting
units that have had questionable repairs.
But I found no further "damage" beyond
this.
I found a transistor and resistor
substitutions in the protection circuit that
were not right, and a substitution in the
rectifier (I remedied these).
I had a brand new set of TO-3 sockets to
put into this, so nothing lost here.
All this is covered in detail on the
following pages...
2) Two bad driver transistors
3) Two cracked emitter resistors
4) three (of the four) bad output transistors
I also discovered that the output
transistors had been soldered into the
sockets on both channels!!! Impossible to
remove without destroying the
socket/transistor. Some hack had been
working on this... Bad Karma. I hate getting
units that have had questionable repairs.
But I found no further "damage" beyond
this.
I found a transistor and resistor
substitutions in the protection circuit that
were not right, and a substitution in the
rectifier (I remedied these).
I had a brand new set of TO-3 sockets to
put into this, so nothing lost here.
All this is covered in detail on the
following pages...
