I have a TDK HD-01 head demagnetizer for cassette decks, but I have lost the instructions. Could you help?

Heads are dirty, need to clean & demagnetize the players Heads.
Cassette Tape Player Audio Head Capstan Cleaner Demagnetizer Kit

No. Due to the small scale of the record head, liquid would clog it.

It sounds to me like a stuck gear causing the clicking sound. Pull off the top and see if you can hear it and see where it is coming from.

Hi PATRICK

What happened when you used the head demagnetiser tape? Did chew out the head? If you can give me the model of the deck I can make some enquiries to help you sort it out.

regards
robotek

Here is the entire troubleshooting section from the manual.

Your problem is presumed to be a shorted speaker wire. I assume you're not getting the failure ONLY at extremely high volume levels.

Care and maintenance
Occasional care and maintenance of the unit and the software
are needed to optimize the performance of your unit.
To clean the cabinet
Use a soft and dry cloth. If the unit surfaces are extremely
dirty, use a soft cloth lightly moistened with mild detergent
solution. Do not use strong solvents such as alcohol, benzine
or thinner.
To clean the tape heads
Dirty tape heads cause sound deterioration. After every 10
hours of use, clean the tape heads with a head cleaning
cassette. Refer to the instructions of the cleaning cassette.
To demagnetize the tape heads
Use a demagnetizing cassette after every 20 to 30 hours of
use. Refer to the instructions of the demagnetizing cassette.
Care of CDs
When a CD becomes dirty, wipe it from the center out with a
cleaning cloth. After playing a CD, store it in its case. Do
not keep it in hot or humid places.
Care of tapes
Store tapes in their cases after use. Do not leave tapes near
magnets, motors, television sets, or any source of
magnetism. Do not expose tapes to direct sunlight, or leave
them in a car parked in direct sunlight.

REFERENCE
Troubleshooting
If your unit fails to perform properly, check the following guide
and the relevant sections of the Operating Instructions.
There is no sound.
•Are the speakers and AC power cord connected properly?
The unit shut off suddenly.
•Possibly a short circuit in the speaker terminals.
Disconnect the AC power cord from the AC power outlet
and re-connect the speaker cords correctly.
The unit blacks out when the unit is turned off.
•Is ECO mode set to on?
Erroneous display.
•Reset the unit.
Poor radio reception.
•Check antenna connection. Adjust the antenna to find the
best reception.
•Move unit and antenna away from other electric appliances
and cords.
The tape does not run.
•Is the deck in pause?
Poor tape sound.
•Check for dirty heads. Clean them if needed.
•Use type I (normal) tapes.
Cannot record.
•Is the erasure prevention tab of the tape broken off? If so,
cover the detection slot with adhesive tape.
The CD player works poorly.
•Is the disc correctly loaded?
•Is the disc dirty?
•Is the lens affected by condensation? If so, wait
approximately one hour and try again.
Resetting the unit
If an unusual condition occurs in the display window or the
cassette deck, reset the unit as follows:
1 Press POWER to turn off the power.
If the power cannot be turned off, disconnect the AC power
cord, then plug it in again.
2 Hold down s and press POWER.
Everything stored in memory after purchase is cleared.

Hmmm.....heres a really stupid question but........is the head clean ? There may be a bit of oxide shorting the one side of the head out. Try cleaning the head with a q-tip and some 99% pure isopropyl alcohol. If you have done that ( you seem to be more knowledgeable than most ), I would suspect either the circuit that drives the right channel record head, or the head itself. Is the head running flat against the tape?. Is there a record/play relay or record relay somewhere in the circuit ?. I think at this point you really need a schematic. Do you have the AC oscillator signal ( bias ) present on the right record head ?. I would try this first, then look into a manual.......Good luck...Rob

Is sound at the headphone socket?
Does the meter show audio output?
If the answer is yes to these questions check that the connections to the amp are correct and the amp is set up is ok.

Regards
John

Ahh, Another Dual cassette deck. These are typically not worth a repair charge. I went looking for a service manual but Hi Fi Engine did not have one but they had a Owners Manual. Any unit that has a specification as to wow and flutter starting new at .18% was never made to be a long lasting deck of any quality. I don't like to be negative about people equipment but you might be better off getting a better deck from the start. If you think it is worth the repair, then send it to someone but I don't think you will want to sink $100 into a unit like this.
I am not saying it is unrepairable but that with what you come out in the end you could have made a better choice for a deck to buy.
It is probably a bad solder joint or bad capacitor on the circuit board.
I am in Chicago and would look at it for you if you want.

You need to use an audio CDr, data or computer CDr's will not work in this machine. I don't know this specific machine, but usually you select the input, then 'rec type' eg manual,1 track or 1 disc,then press record to get into record pause,start your source,then press play on the unit to start recording. To finalize, you press finalize then either the play or rec button to start the finalize process.

Hi Does the deck have VU meters?...or a graphic display of some kind to indicate there is sound being picked up from the heads? If there are, and they are not moving or flashing, as the case may be, then you could have a wire off the head, or a problem in the preamp circuit, or if the deck is older, it could be as simple as a dirty play/record switch. I would need more info to help further. Good Luck!