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Denon DN-77OR double casette deck-right deck playing FAST!

N

nightfly61

Guest
A couple months ago I broke out this old deck, cleaned it up, fired it up & started feeding some old shows into Adobe Audition-no prob...
I did a couple half hour tapes & got sidetracked.
Today (weeks later) I turned it on & the RIGHT deck, (the one I was using before) is playing fast (like it's wanting to high speed dub). Each deck has it's own speed adjust but it's going way too fast to slow down to normal. I tried fiddling with every possible setting. It is a 2 motor system/twin output system & the left side works fine. Any semi-old schoolers ever have this happen or know what may have happened here? Thanks again!!!
 
Take a look at the takeup reel clutch and associated mechanical tidbits. The clutches will drag, or even jam in fast fiorward, resulting in yanking the tape waaaay faster than the capstan is going.Don't overlook the possibility of just getting another deck assembly from Denon - it used to be a replacement part and wasn't greatly expensive.
 
You'll probably find that if the deck is playing fast, the capstan is running fast as well - simply because once the deck is in play mode, the capstan limits the speed of playback. Unless the pinch roller pressure is too low against the capstan, there is no way the take-up spool can "drag" the tape faster than what the capstan is running at.

In these decks, the normal speed / high speed switching controls a line that runs to the drive motor. These motors have 3 or 4 terminals on them. One is normally permanent +12 volts, one is ground, one is the low/high switch line and occasionally I have seen a tach/reference output.

What you need to look at first of all here is the low/high switching line. Check the voltage on it compared to the same terminal on the "good" deck. If they are the same, and the deck is still running fast, the control PCB inside the motor has gone belly up. A replacement motor is not expensive.
 
Thanks again all...time to pull it out of the rack.
 
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