Okay - you asked for it:
Both of these were eBay-acquired fixer-uppers. They both had issues with the regulated PS boards, not uncommon for these older Pioneers. Regarding the big boy, here are some excerpts from a repair database I use to keep track of this stuff:
- 13.5V, 8V, and 5V supplies all dead; C203 visibly leaking. Q203 (2SD712) open.
- 35VDC on signal line; Q14 leaky E to B (2SC1904A); replaced with NTE373. Also replaced Q16 (2SC899A) with NTE374
- No 88V supply to Q4, Q5, & Q6. Poor workmanship by previous tech - poorly crimped lug connection to both C3 and C4 22,000uF filter caps. Little to no contact.
Rewired all connections with new wire & new crimped lug connectors.
- Set DC offset and idle current back to factory specs (idle current was at 0mV for both channels)
- Poor contact to ground in variable tuning cap bearing. Sprayed Deoxit into bearing and worked back & forth until contact restored
- Removed AWG-058 and AWG-059 assemblies, sprayed all switches and pots with Deoxit, desoldered, disassembled and cleaned volume pot, reassembled; tested OK
The tuner appeared to be in excellent alignment, and it's tricky on these 1980's, so I left well enough alone. I'm pretty much a proponent of "If it ain't broke, don't fix it!"
I was really tempted to keep this one for myself, but I picked up a beautiful SX-1250 a few months ago that seems to have won my heart... for the time being, anyway!