There are 2 ways to do it: - either by adding oil under the washer and let it go inside the bushing; - removing the washer, taking the...
Yes there are AR-10 mechanism RQ-SX walkmans with solid capstans. In regard to mechanisms, some RQ-SX units have AR90 mechanism instead of AR10....
I mistaken this model with another one. C901 is not needed (it's there for filtering mains hum of AC adapter), as there is another capacitor at...
Since only head preamp and Dolby amp are operating on 2.8V, it makes sense the radio works without this voltage rail. Would rather suspect C901...
Apart from roughening it with ferric chloride, don't think there's much else you can do. Original micro grain surface cannot be restored. If...
In this particular case it should have been listed as "For parts or not working" indeed, my statement was generic. But it doesn't matter, fact...
It's debatable if a cracked gear would fall under "For parts or not working" , since these units are actually producing sound even with a cracked...
Yes, with no tape inserted, EQ set to 70μs, Dolby C (so you have the lowest noise floor) start measuring the output of head preamp (emitter of...
National/Panasonic RQ-KJ1/WJ1/SJ1/J2 All of these units are identical apart from the outer casing. The devices use a flex-type double sided PCB...
Looks like the lever near is what pushes the lead swich, but it must sit lower for that to happen. The end marked X should go into the recess below.
To eliminate the possibility this crackling being motor hum, would desolder the motor and see if the problem goes away. Dolby IC is very...
Indeed check the sidecar on other walkman if possible. Also get a gumstick and check if the unit actually works. On these walkmans, corrosion on...
The term "static" is a bit generic, would be useful to describe in more detail: is it a hum, a crackling sound or just the noise floor of R...
Not sure if it's worth trying to repair that disc... Given there's quite a bit of force when clutch is slipping, chances are it will fail again....
That plastic membrane is part of the bushing, it's there to keep the motor shaft at the correct height. Don't know why on some motors it is made...
Cell phone chargers are indeed switchmode, have been like that for a very long time. @overmodulated Yes an unregulated power supply will have...
DC jack is a 2.1 x 5.5mm. For the PCB mount one you will have to find one with correct footprint.
You got the pinout wrong, see picture attached. Pinout is pretty much standard on SOT-23 transistors. Q302 is added in this circuit to boost the...
I would start with Vcc (pin 3 of IC301), which should be 2.25V with a 3V battery voltage. This voltage is generated by Q302 + internal circuit of...
Fact you have the same 0.55% in both directions is suggesting the geartrain is not the root cause of the problem. This is assuming the belt is...
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