⟐ Answer unaccepted January 06, 2018 at 17:39 MST

⟐ Answer accepted February 04, 2017 at 10:46 MST

⟐ Commented April 08, 2025 at 11:06 MST

⟐ Answer accepted February 04, 2017 at 10:49 MST

⟐ Answer deleted November 09, 2021 at 2:59 MST

⟐ Answered February 01, 2021 at 9:20 MST

⟐ Edited June 09, 2020 at 15:34 MST

This is what i done so far: When i try to power it up, i don’t get a red light indicator so i try to disassemble the device. Then i desolder the board from the chassis and battery connector just fell off. I solder it back, try to power it up and still nothing. Next, i inspect the board and found it had battery leak corrosion around IC4. Then i try to scrub the board with flux and little bit of solder and some of the copper pad fell off. I tried to connect the broken pad with thin copper wire but still not working.

Here what i know so far: Main GND and VCC is getting around 1V.

What should i try next? I have a schematics but can’t really understand it properly.

PS: I’m doing this as a hobby and not fully know what i’m doing.

Schematics

Board

Table

[Update 12/12/21]

⟐ Answer accepted December 18, 2021 at 4:49 MST

I'm sorry the question says CFD-8, but the site doesn't have the 510 in its database.

I've been trying to fix an old CFD-510 Sony Boombox I found a while ago, everything else works pretty great, but the cassette deck needs a new belt. This is easier said than done, as the idiot who had it before me sealed the access points with a resin. After a LOT of rubbing alcohol later, I can peel back the access point, but there are things in the way, and I can't figure out how to put the belt in. Would anyone here have any idea on how to help?

⟐ Answered November 29, 2025 at 20:55 MST

I'm sorry, I'm just a total novice. The right side spool is not turning and from online research, I think it is called the take-up spool. Initially when trying to play a tape, it seemed so much unraveled tape piled up on the take-up side until it jammed and seized. I've looked and can't see that there is a missing belt and haven't tried to get inside where gears are.

⟐ Commented August 26, 2025 at 6:24 MST

• In this cassette deck, there’s a rubber wheel thst spins and touches two larger white plastic wheels that the spool “pegs” go through. Spinning the white wheel makes that peg spin. The wheel dedicated to playback (the right wheel) is split into two thin wheels, and the rubber wheel will jump between the inner and outer wheel depending on whether you are fast-forwarding or playing back the tape.
• If I trick it into thinking there’s a cassette in there, it’ll happily spin. Sometimes it doesn’t spin the white wheels properly, but most of the time it does.
• When I insert an actual cassette, it will start spinning, and the second the tape is pulled taught, it auto-stops. If I press play, I can hear the motors spin, and I can see the rubber wheel spinning one of the thin white wheels, but it isn’t enough to move the peg. It’s like the peg isn’t entirely attached to the wheel? It jumps to the inner wheel of the two sections when playing back, and when fast-forwarding it jumps to the outer ring. Playing back, it succeeds in spinning the wheels, but the pegs kinda get stuck. If I loosen the tape, it does spin the peg until, as I mentioned, the tape gets tight. Then it stops, kinda like it’s reacting to the tape not moving.
• I can move the spools with my finger, and it doesn’t feel unusually tight.

⟐ Answer deleted July 02, 2021 at 11:57 MST

Any help apperaciated

Joseph

⟐ Answer accepted December 17, 2016 at 10:18 MST

⟐ Answer edited October 09, 2025 at 21:57 MST

I am now stuck on a sound quality issue along with the volume meter problem. I only listened to it for half a song before the belt snapped initially, so I don't know if it's my tinkering or a consequence of the Potentiometer. I've cleaned the head, pinch wheel and capstan system, but not demagnetized yet, though I doubt this is the issue.

The potentiometer is spinning round and round instead of the set limit it's supposed to have, and clicks on or off jumping to random volumes and channels. What is it's part number? does any one have the Manual for the WM-4? Would it be worth finding and using contact cleaner on it?

I would love any advice you have. Regards

⟐ Answer accepted November 22, 2024 at 12:10 MST

⟐ Commented November 08, 2024 at 17:45 MST

⟐ Commented October 09, 2024 at 14:31 MST

https://www.youtube.com/watch?v=pul-2ZNc...

Someone said it means one or more capacitors on the mainboard have died, but someone else says the speaker is just not good anymore.

⟐ Answered September 26, 2024 at 15:05 MST

Recently acquired a silver Sony Walkman WM-4. Installed new batteries, new belts and lubed gears. When pushing play sometimes it it will start and sometimes not. With the back off I can rotate the silver metal gear by hand and it will eventually begin to work. When it does come on the sound through the headphones sounds like your underwater. I can't seem to find any information showing where to adjust the speed on this model.

Thanks for any help or advice

⟐ Answered November 27, 2023 at 0:51 MST

I got an Aiwa HS-G35MKIV Walkman. Overall it is in a good condition but the headphone jack is bothering me. I have two problems and I try to explain it as good as I can.

First problem:

It is supposed to be stereo. When I plug it in (a little bit) sound comes out of the right headphone pad, when I plug it all the way in it comes out of the left headphone pad.

Second problem, and the one that bothers me the most: When I listen on my headphones there is a weird noisy sound. It comes out of the headphones and sounds like a mixture of hissing and high frequent tinitus (fieping / pipeing). When I turn up the volume to max it is unbearable. When I lower it I am getting used to it but still annoying me. When I turn down the 10kHz on the equalizer it also gets a little bit better. When I get the 3.5mm cable a little bit out of the headphone jack and but a certain kind of pressure on it the noise disappears. I believe that maybe the headphone jack is a little bit loose and I want to fix it. Hope someone is able to help me.

⟐ Answered October 15, 2023 at 6:14 MST