PE01 Tone Board
I finally got back to the rebuild so thought that this board would be easy. You'd think that a board that is so easily removable and totally accessible would be easy to work on, wouldn't you? ;-) This board really kicked my newbie butt!!
Lots of blue blobs to change on this one:
Here's the "before" of the PE01 board:
.....and here's the "after":
The biggest issue I ran into (as a complete newbie at this) was the way this board was put together. The power supply, phono and power amp boards were pretty easy to rebuild with most all of the parts inserted with the component legs hanging straight down prior to soldering. Almost every component on THIS board was inserted and then bent at a right angle to hold the part in place. So, every part had to be desoldered enough to bend the legs straight before they would come out. This became such a PITA that I damaged a couple of the solder pads. This is the worst one. I had to use one of the snipped parts legs to bridge across the bad hole over to the other part that shared this pad:
My best guess is that I was too aggressive with the solder braid OR I managed to snag the trace with the bent end of those blue blobs as I tried to straighten them. Any tips on how to attack these bent leads in case any of my remaining boards were put together this way?
My first test with the DBT was not a good one. The tester did it's usual bright glow and then dimmed but as soon as the relay kicked in, I had problems. I heard hiss coming out of the right channel and then some nasty crackles and pops. I double-checked all my solder points and found a bad one....problem solved. I've been running the 2275 for several hours this evening and the first thing I noticed was a pronounced brightening of the sound. I'll try to give some more feedback on the sound changes after I live with this update for a few days.
Here's the parts list for the PE01 board with original and replacement values and Mouser part numbers:
CE05 - 1uF / 250v ---> 1uF / 450v (ECW-FD2W105J)
CE06 - same as CE05
CE09 - 100uF / 10v ---> 220uF / 25v (UPM1E221MPD1TA)
CE10 - same as CE09
CE11 - 10uF / 35v ---> 22uF / 25v (UES1E220MEM)
CE12 - same as CE11
CE13 - 3.3uF / 35v ---> 3.3uF / 50v (MKS2B043301H00JSSD)
CE14 - same as CE13
CE33 - 1uF / 25v ---> 1uF 50v (MKS2B041001C00KSSD)
CE34 - same as CE33
CE35 - 3.3uF / 35v ---> 3.3uF 50v (MKS2B043301H00JSSD)
CE36 - same as CE35
CE37 - 4.7uF / 16v ---> 4.7uF 50v (MKS2B044701K00JSSD)
CE38 - same as CE37
CE39 - 220uF / 35v ---> 470uF / 35v (UPW1V471MPD)