Do you have the schematic of the unit ? I would like to see what purpose those 2 diodes have.
Did you thoroughly clean the head after applying that polishing paste ? Maybe some remained in the head gaps, prevening good head tape contact....
I would start with the most commonly repaired ones, like the D6C. For example, the problem with motor running fast is something that has been...
That head certainly doesn't look good. There's a lot of pitting and something resembling rust in the head gap area. What have you done with that...
This thread is intented to be complementary to the "List of common problems on walkmans/portable recorders", in order to have discussions and...
This is a very important aspect which can clearly influence the results of a test. To me, the way to adress this issue is to choose a piece of...
I included this issue as a potential common problem in my "List of walkman/portable recorders common problems":...
Marantz PMD221 - most units that are sold as not working will have a burnt motor governor, a burnt headphone amplifier and 2 blown capacitors;...
Marantz PMD430 Generally speaking a portable without many issues apart from needing maintenance/calibration, unless it has been powered with...
TC-D5/D5M/D5Pro/D5Pro II - biggest problem on this unit is old rubber; some replacements are available for idlers, but a good quality capstan...
Panasonic RQ-SX series (AR10 mechanism) - problem with clutch retaining washer; New metal one can be found here:...
SONY...
SONY WM-(F)10/WM-(F)10 mkII/WM-F10 mkIII/WM-10RV/WM-F15/WM-(F)20/WM-30/WM-50/WM-70/WM-W800 - potential problem with the table reels outer toothed...
Pioneer PK-5AW/PK-R7AW/PK-3/PK-F9 - a new belt will be needed; - pinch rollers are likely to need replacement; closest I could find are the ones...
SONY DD1/DD10/DD11/DD22 - known capacitor leakeage problem; a repair kit is available on ebay; - rubber will need replacement (capstan ring and...
AKAI PM-01/Infinity Intimate Stereo/Cybernet MiniConcert(IntiMate)/KLH Solo - capacitor leakeage problem; I only repaired the Infinity in the...
JVC CQ-(F)7K/CQ-(F)5K, CQ-R7K, CQ-V9 - capacitor leakeage problem; note the PCB on this one is a giant flex one glued onto an aluminium...
JVC CQ-1K/CQ-F2 - capacitor leakeage problem (uses CE brand caps); - potentially damaged carbon printed resistors (can be replaced with normal...
SONY TCD-D3/TCD-D7/TCD-D8 - very complex unit with a lot of common problems; even ones that are sold as working will fail for sure in the near...
SONY TPS-L2/WM-3 - the battery cover latch is often missing and requires replacement with a 3D printed part available on ebay; - rubber set...
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