EEVblog Electronics Community Forum
Electronics => Repair => Topic started by: davorin on November 08, 2014, 03:47:23 pm
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Good afternoon (o;
I just acquired a Sony DTC-670 which I knew it was defect, but not the ral cause..
Now when I put in a cassette it closes, pulls the tape in, starts rorating the head and soon after stops with a "CLOSE" blinking in the display...
Closing the lid without a tape shows no errors...
Some simple mechanical switch gone wrong?
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It sounds like a switch problem. Here is a service manual:
http://www.hifiengine.com/manual_library/sony/dtc-670.shtml (http://www.hifiengine.com/manual_library/sony/dtc-670.shtml)
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Well..the service manual I already have...and only some end consumer type fault messages are included....
Got hold of a second one now...and swapped the drive...after few tries the tape starts playing now....also recordong...
though strange with recordings that now and then some milli seconds are missing...just like a bad CD with lots of scratches...
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This is really weired....got it now at that point that it records fine from SPDIF in with audio feed from a Wandboard Linux board...
But when I power off the DAT device and switch it on next day to play back...there is no recording anymore..just the 48kHz is blinking...
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Hmm...happens even with frsh recordings....sound is fine for a few minutes, then distorted (not nice to hear through headphone ;o)...and then okay again...
Now suddenly plays back the Pink Floyd Endless River recording from yesterday (o;
Time to throw away the tapes? I already cleaned the drum head....
Hmm..just discovered that the distortion is not as the same spot when I rewind and play it back again....
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Signal on the drum head seems fine during recording....
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Swapped the RF preamp board from another 670 and now it palys back a recording...let's see for how long ;-))
Though it doesn't write the Start ID automatically anymore...
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Hmm...no joy....no playback anymore.....
Even replaced the capacitors on the RF amplifier board as suggested on a Youtube video....
No wonder Ebay is full of Sony DAT recorders marked as broken/for repair....Just never bid for one...you will never get it fixed (o;
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Sounds like it could be a loose coil connection inside the read/write head itself causing intermittent failure. Try finding a replacement.