hopjohn
Silver Face
With all the replacement parts now on hand, a new to me Fluke 87V multimeter, and some Deoxit Gold G100L for the switches it's time to move forward.
The front end is disassembled leaving all its guts spewing out. Initially I put bubble wrap around the power meters to protect them from damage, but after moving the amp few times I felt the best way to proceed was to remove them altogether. I did this by desoldering the wire wrap pins that hold them to the small meter pc board.
The first board to receive work is the control board X11-1410-00 A/4 or as I refer to it the "top control board" since the second control board is sandwiched just beneath it. This tightly packed board houses twenty-six electrolytic caps. Photos of spare boards owned by gort69 and other stock boards found on the WWW prove that the type of some of the capacitors used on this board were not consistently the same. Kenwood seemed to play fast and loose with whether or not to use low leak or general purpose caps in positions Ci9, Ci10, Ci33, Ci34, Ci39 and Ci40. Ci9 and Ci10 are at the input pairing and should always have been orange 47uf 16v, but because Ci9 was such a tight fit against one of the switch bodies my guess is they may have eventually moved away from using them and instead opted for what my board had installed, a smaller bodied general purpose 47uf 10v (shown below just underneath the furthest right switch).
A depopulation of the board is shown below. I've removed the four mylar caps at Ci35-38 and replaced them with smaller Panasonic ECQ equivalents in order to make room for the Wima MKS2 1uf 63v caps at Ci31 & Ci32.
The front end is disassembled leaving all its guts spewing out. Initially I put bubble wrap around the power meters to protect them from damage, but after moving the amp few times I felt the best way to proceed was to remove them altogether. I did this by desoldering the wire wrap pins that hold them to the small meter pc board.
The first board to receive work is the control board X11-1410-00 A/4 or as I refer to it the "top control board" since the second control board is sandwiched just beneath it. This tightly packed board houses twenty-six electrolytic caps. Photos of spare boards owned by gort69 and other stock boards found on the WWW prove that the type of some of the capacitors used on this board were not consistently the same. Kenwood seemed to play fast and loose with whether or not to use low leak or general purpose caps in positions Ci9, Ci10, Ci33, Ci34, Ci39 and Ci40. Ci9 and Ci10 are at the input pairing and should always have been orange 47uf 16v, but because Ci9 was such a tight fit against one of the switch bodies my guess is they may have eventually moved away from using them and instead opted for what my board had installed, a smaller bodied general purpose 47uf 10v (shown below just underneath the furthest right switch).
A depopulation of the board is shown below. I've removed the four mylar caps at Ci35-38 and replaced them with smaller Panasonic ECQ equivalents in order to make room for the Wima MKS2 1uf 63v caps at Ci31 & Ci32.