All functions in my MX-J700 work perfectly well except for the tape
player. I tried cleaning the heads, capstans, and pinch rollers but
still when I press the tape button neither one of the two tapes seem to
be even working.
I also noticed that every time I turn on the system I hear a clicking
noise (6 clicks to be exact). When I turn on the system with both
cassette holders open, the clicking appears to be coming from both
holders. First, the "B" holder makes 3 clicks (clicks are made by what
looks like a white plastic piece in the lower right corner) while the
"panel" that contains the head and the pinch rollers is raised. After a
very short pause, the same goes for the "A" holder.
I have had this problem with mine what you can try is when it does the clicking sound you can take your fingers reach under the black part w/ the head and gently push up when it clicks if you hear more clicks and the part moves then try pushing and holding the tape switch located at the left or right top corners of the player then press play if the head goes up but the clicks 3 times fallowed by 6 clicks the repeat the process. what is going on is if they r not use it tends to lock up
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When the deck is clicking when you first power it up, reach inside and turn the capstans by hand and this should disengage the tape head assembly. The problem is the drive belts are slipping and need to be replaced. The door will not open because the head is engaged.
hello, i would suggest manually cleaning the heads,capstan and pinch roller.This requires only isopropol alchohol and q-tips.The metal post coming out is the capstan , if its brown than you will want to clean it back to chrome,above it is the pinch roller clean that as well. Finally there are your heads simply clean the tops of both . Sometimes old tapes become tacky and sticky so consider the age of your cassette as well.
Hi. Firts of all.. chances are that your unit needs to be cleaned or you used low quality cassettes in thr player. a tape has would itself around the capstan and pinch roller causing everything to jam up. you may need to open up the unit..seperate the cassette mechanism from the main chasis and take it apart delicately in order to get the tape out without breaking the door catch .. Use tweezers but do not mark or scratch the azimuth head...OR.. try it from the front and try to open the door with a fingernail in there..while pressing the eject...good luk. Trace Electronics Repair, Canada
If the motor is running but the belts are not, then they are probably shot. You can buy belts by size or buy a belt kit at MCM Electronics.
If the motor is not running it could be 2 things: 1. A bad motor or voltage to the motor.... 2. A bind. I've seen the grease on the capstan bushing get old enough to turn into a very hard tar. So check the motor and capstan for freedom of movement.
This is a common problem....with tapes.....in the old days there was a shiny end of tape (EOT) sticker placed on the tape end which was detected as the tape end and caused the electronics to reverse the motor drive to play in the teverse direction.
If consumers alter the length of the tape by cutting and joining they used to cut off the EOT sticker and then the tape wouldnt reverse like in your case.
Now days a hi frequency signal is recorded on the tape and a detector circuit inside sees this signal and reverses the tape for you,
I would suggest that the simplest thing to do is to clean the playback head with a cotton bud and some special head cleaning alcohol.
There jusy may be a build up of magnetic material on the play back head which is stopping the high frequency signal getting through to the detector circuitry.
Different manufacturers do this EOT detection in different ways but the head clean is the first line of attack that you can do yourself.
Please turn off the power before doing this activity and be very careful with the cotton bud that you are not rough and dont push too hard on the recording/play back head.. Be gentle...
The cleaning liquid must be proper head cleaning liquid, so dont try shorth cuts and use just anything to do the cleaning or you may ruin the detector head surface.
The quality of play back sound will also improve from a good clean..
You probably have one of two problems. Either the tape has been eaten by wrapping it around the capstan or else the head has not retracted to let the door open. If the tape will still play, then it is not the first problem. If the tape will not play, then it could be either problem. If it is the latter problem (head not retracted) then you may have a bad belt (broken or slipping). The tape wrapped around the capstan problem may be caused by a belt or tire being bad but a different belt or tire than the head not retracting problem. This may seem confusing to you but that is just the nature of the thing. In short, I'd bet you have a bad belt or tire that needs replacing. I hope this helps. Good luck.
Motor speed needs to be regulated by PWM. Reducing the current (with a resistor) actually lowers the torque - which, with a given load, does result in reduced speed - however, different length tapes (60min vs 90min), as well as different quality, and even current position in the tape, will change the load and hence the speed.
You need to regulate the speed via PWM. It's sometimes done on a small board built into the motor, in which case you'd have a round hole into which you could insert an INSULATED screwdriver (tiny flathead wrapped most of the way in electrical tape works).
It may be done on the main board, in which case you could find a pot conveniently labeled "motor speed", or perhaps "pulse width" or "pwm" or something to that effect. Find it, mark its current position just in case, and turn it to see if it gets the effect you're after.
And there are some tape decks in the world with no speed adjust - they are designed with a specific speed motor and the sizes of the wheels and gears are calculated for that speed.
Also there may be a mechanical fault/malfunction causing the speed problem.
An initial check and thorough cleaning of the capstan and pinch roller should be done. If there is a buildup of tape oxide or a piece of a broken tape wrapped around the capstan, the tape travel will be too fast (do to the effective increase in capstan shaft diameter).
If the pinch roller isn't fully engaging, the tape can be getting pulled onto the takeup spool at a speed faster than the capstan control.
A different source of trouble might be a slip clutch (possibly an
idler/clutch assembly)which is binding, or otherwise not functioning the way it should.
Another type of motor doesn't have it's speed controlled by an internal or external voltage.. instead, the motor has an internal centrifugal speed controller. This type of motor can be found on older tape decks, and might not have been utilized more recently.