Service manual for Dual turntable with 8-pole synchronous motor, covering motor, belt, tonearm, and speed adjustment.
This service manual provides detailed instructions for maintaining and repairing the Dual 8-pole synchronous motor turntable. It covers motor pulley replacement, belt installation, tonearm adjustment, and speed calibration using a stroboscope. Technical specifications include platter speeds (33 1/3 and 45 rpm), power consumption, and tracking force adjustment ranges. The manual also includes troubleshooting for common issues like tonearm misalignment or turntable speed problems.
| Platter Speeds | 33 1/3 and 45 rpm |
|---|---|
| Power Consumption | Approx. 10 watts (to each nominal speed) |
| Platter Weight | 1.1 kg |
| Tonearm Friction | Vertical 0.07 mN, Horizontal 0.15 mN |
| Tracking Force Range | 0 - 30 mN (0 - 3 g) |
| Wow and Flutter | Total Wow and Flutter DIN ± 0.07 % WRMS ± 0.04 % |
Adjust the belt to the desired motor pulley step using knob 16. The speed is pre-selected when the turntable is off and engages when powered on.
The tracking force can be adjusted from 0 to 30 mN (0 to 3 g) using the helical spring in the spring case.
When the platter rotates at the correct speed, the stroboscope lines appear stationary. If they move forward, the speed is too high; if backward, too slow.
The turntable operates on AC 50 or 60 Hz, with voltage options of 110–125 V or 220–240 V, and consumes approximately 10 watts per speed.