The simplest therefore most annoying problem imaginable: you put the cassette in the metal cradle on to the inside of the door. You push the door closed and... it pops open again. Whether loaded or empty, the door doesn't click when you push it closed and springs open again when you release the pressure. Can't see anything wrong with the catch (if that's what it is) although it's hard to see how it's meant to work. The button "push to close" on thr outside seems to do nothing at all! Perhaps a bit has fallen off? please help if you can.
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This is most common as the catch is there to stop you from opening the cassette door while the head base is in the up position. The reason many of these cheap dual cassette decks all have this problem is that the mechanisms are not built to last and then the cost to repair them exceeds their value. You need to find out why the mechanism is not getting back to the stop position and when you do this the eject issue will be fixed. Typically it is a stretched belt. Putting it in is another matter though.
Cradle and contacts are fine. Cradle circuit is nothing but a reed relay and few wires, relay closes on proximity to robot's body, therefore no voltage on contacts before robot is close to cradle. There is a thermistor inside of battery, and mine was bad. I removed it and now I am charging the battery from my bench power supply at about 220 ma current, overnight, and it works. Probably the solution is to get a new replacement battery, but the one with the thermistor inside (OEM), easily recognized by the third wire, and all should be fine, assuming that nothing else is wrong with charging circuit or power adapter (12v/1A) Hope this will give you some ideas of where to poke. Once successful, please post your solution.
This is going to sound a little odd, but properly jack the car and then try opening this door. Put the jack in the recommended jacking spot on the passenger side.
Imagine that the back and front ends of the car are compressing the center of the car. By lifting one end or the other, the center may shift. Otherwise you do not have a frame, but the engine cradle may have a support located closer to the center of the vehicle. Do not jack the sheet metal, but you may catch the cradle and apply lift there.
You may notice by putting in a piece of cardboard in the doorjam on whether there is an increasing gap as you jack the car.
The more detailed the description of the problem, the better for diagnosing the root cause. Thanks.
It sounds like you have a couple of problems. I'll address them as you have them numbered above.
1. Decks typically have belts to drive the various 'reel' mechanisms. Therefore, they can slip without breaking anything inside the machine or the tape. Your first symptom leads me in that direction.
2. That it migrated is mysterious, unless Sony is using a common motor to handle both decks' reel duties.
3. This symptom may have something to do with the root cause of both sides jamming...
Do the cassette well doors come off, say, for cleaning? Could they be dislodge? If so, they may have something to do with the jamming problems in # 1 and #2 as the doors play a part in positioning the cassette and holding it in place against the reel motor cogs. How do the doors operate with NO tape inserted?
Does it take excessive force to close the door only WITH a tape? make sure the tape is fully seated before closing the door. The capstans (directly below each reel cog) have to engage through the small holes at the lower edge of the cassette. They should be straight and clean. Any dirt or oxide on them will cause problems as these are what move the tape at the precise speed necessary for good playback or recording.
My hipshot recommendation, otherwise, is to look around inside the cassette wells very carefully for any foreign matter, debris, dust bunnies.
Firstly: do not think about forcing the cassette door!
Look inside the unit. You need to hand rotate the capstan flywheel a
bit,( a large-ish metal disc attached to the motor via a rubber drive belt.)That should release the powered deck mechanism and allow
Then buy a new drive belt , so that problem does not recurr.