TG501/Repairs

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Repair Issues

  • Check for +15 V and adjust if not between 14.3 V and 15.7 V
  • If +5 V is outside 4.94 V − 5.46 V, check U626 (LM741) − old opamps are prone to failure.
  • A lot of ICs are placed in non gold plated IC sockets. Contact problems can occur. Removing and inserting ICs helps.
  • A1 board should be mounted to frame only with washers inbetween, especially near the rear connector. Shorts to conductor tracks can occur otherwise.