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Help with M70: Cassette Problems - Noise and no Sound on left Speaker.

drmz - 2008-12-01 11:22

Hey,

today my M70 arrived and I´m pretty happy.
The description said tapedeck not tested so I was warned, that it might not be working at all. Surprisingly the belts seem to be fine. But I just have sound on the right chanel. On the left speakers (woofer and tweeter) there is just a loud noise. When I level the volume for this side down: it´s still making that noise for about a second and that it´s quiet. The right chanel is playing fine without any noise and with good sound.
In radio-mode all bands play perfect on both sides. No noise, good tuning and balanced sound.

Before I dive into this project, maybe you have some suggestions where to start?

geoffhartwell - 2008-12-01 11:26

try spraying some contact cleaner on the record playback switch, its an ease first thing to try

71spud - 2008-12-01 11:34

Just so you know.... "not tested" means "doesn't work". It is right up there with other sure things like death and taxes.

drmz - 2008-12-01 11:45

Yeah I know, but the price was good and beside that it´s in good condition.The price for a mint unit is to high for my small wallet at the momentWink Okay, one antenna is missing completly.

@geoff: thanks. Do you mean the play/record button?

ewen - 2008-12-01 11:55

DRMZ:
Do you need an antenna? I think I have one, but it's going to be mixed up with lots of others in a drawer - if you do, can you measure/describe it precisely and I'll see if I can find it. Send me a PM. Smile

geoffhartwell - 2008-12-01 12:04

quote:
Originally posted by drmz:
Yeah I know, but the price was good and beside that it´s in good condition.The price for a mint unit is to high for my small wallet at the momentWink Okay, one antenna is missing completly.

@geoff: thanks. Do you mean the play/record button?

its located on the main pcb, its about 3 inch in length half inch wide and got lots of legs solderd to the pcb, it moves inside and conected to the tape deck with a metal rod or plate

success - 2008-12-01 14:16

I Agree

If you want, press REC & PLAY and then STOP several times.
If the failure dissapears ... you need to clean the record/play switch.



quote:
Originally posted by geoffhartwell:
quote:
Originally posted by drmz:
Yeah I know, but the price was good and beside that it´s in good condition.The price for a mint unit is to high for my small wallet at the momentWink Okay, one antenna is missing completly.

@geoff: thanks. Do you mean the play/record button?

its located on the main pcb, its about 3 inch in length half inch wide and got lots of legs solderd to the pcb, it moves inside and conected to the tape deck with a metal rod or plate

drmz - 2008-12-02 09:23

Thanks again, guy´s.

I will open it for cleaning anyways, so I will look out for this switch.

@Ewen: I can take a picture and PM it to you with the size, when I´m at home.

ewen - 2008-12-02 10:16

OK DRMZ - the measurements (full end to end) + number of sections in the aerial should help me identify it.

ghettoboom777 - 2008-12-02 10:29

Hi Ewen-Do you possibly have a cassette screw for the cover for a M70?(There's 2 screws that hold the cassette door on-Outside)Need 1!
That's all I need to make my M70 mint!
Anybody out there have one?
I'd appreciate it-Thanks-Ghettoboom777. Smile

ewen - 2008-12-02 10:35

Sorry - if I had one you could have it GB777. Literally the only M70 part I have is a single aerial as have replaced both with a (99% match) matching pair. Good luck - post in the wanted and see what gives..

Smile

drmz - 2008-12-08 05:02

Just a little update:

I had lots of work to do in the last week but finally I found some time yesterday to have a closer look at the m70.
Good news, the fix pushing play/record a few times worked very good. I have sound on both speakers in tape mode now. Big Grin
And there was something loose inside. I heared it, when I moved the box. Guess what I found inside? The second aerial!
The plastic parts (where the screws go in) were broken of and the aerial slipped inside I guess.
So I glued these plasticparts to the back again. Voila.

Finally I´ve got a not mint but fully working M70 for 110 Euros. No parts missing, nothing else broken - was not a bad deal in my eyes.
I will post some pictures soon, when cleaning is done.

jameswp67 - 2008-12-08 06:58

that is a great deal! Congrats! Great work!