I need help to solve a slow rewind problem in an NEC DX3000 VCR. I've changed the caps on the capstan motor PCB, and I've replaced the belts and tyres. I can't feel any excessive drag in the mechanism, only the light application of brake pads to maintain a minimal tape tension. The motor voltage is 7.4V which is correct according to the service manual. Fast forward is OK, but should probably be a little faster. The idler tyre has plenty of grip - I can feel the resistance of the servo in play and cue/review modes. It seems that the motor's torque is too low at the applied voltage. In fact I can easily stall the motor with light finger pressure. The drive voltage remains at 7.2 -
7.4V when I do this.I can work around the problem by adding a 3K3 resistor in parallel with R618. This results in a drive voltage of around 8.0V.
If anyone knows of any other common faults with this machine, I'd like to give it a full service. TIA.
- Franc Zabkar