CT-W300 Tape womt record

[sdoom]

hi @ all.

I got a tape (Pioneer CT-W300) that wont record at all. This is a dual - tape. Tape A only can playback, Tape B can playback and record.


Both tapes play back correctly.

If I feed an input signal to the inputs both level meters work correctly , level can be adjusted with the record level shifter, too. But when finished recording, there is still the old music on the tape as it was before . Sometimes it is audible, that the recording is there in the background, but very silent and not all the time.

I have a good understanding of reparing amplifiers but I only have little knowledge about tapes. I checked the TAPE B tone-heads (fully metal type) with an ohmmeter and both coils read 220 Ohms, compared eith TAPE A I have the same readings there.

There is an additional black plastic type head in TAPE B. I assume that is a "delete head" ? It reads only 1,4 Ohms.

I tried to measure the voltage across this plastic head, and it is always 0.00V, regardless if in playback or recording mode. Is this section faulty ?

Am I right if I say, the delete head deletes the tape in record-mode and the fully metal head is used for both playback and recording ?

Thx,

Stephan

[sdoom]

No one around who can tell me how a tape recording works ?