[tig] Ampex DCT 700D Servo/MDA Board help
Tue Mar 16 22:05:01 GMT 2004
I have a problem with an Ampex DCT 700D VTR. Maybe some one can help or
can give some advice.
The VTR has a problem with the Capstan. I replaced the Capstan motor
(it had a bad encoder) but the real problem is probably on the Servo/MDA
board. On that board I replaced the MOS FET switching driver (U132) and
CR42 and CR43 but still have these problems:
1. Motor just gets up to play speed but nothing much faster ( and that
is only after the VTR has been on for about 10 minutes) If less then 10
minutes the recorder is between 50-70% play speed and has a "servo high
pitched buzz" sound when not at speed.
2. The motor won't go in reverse or rewind.
Does anyone have an extra SERVO/MDA board for this VTR that I could
borrow to see if the problem is on this board.
Or I could send my board to you and you could see if it exhibits the
Anyone have an extra SERVO/MDA board for sale?
Any help is appreciated.
Debenham Media Group
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