Technics Sa-370s Service Manual Direct

The power supply section of the SA-370S contains large filter capacitors that can hold a lethal charge (approx. 40-60V DC) even when unplugged. The manual highlights the high-voltage areas and discharge procedures.

Beware of third-party “instant download” sites charging $9.99. They often sell:

Verify before paying: Check that the page count is >25 pages (genuine SA-370S service manual is 32-38 pages). It must include at least three full-page schematic diagrams.

Symptom: The relay clicks, then immediately shuts off, or never clicks at all. Manual Solution: Turn to the Protection Circuit Schematic (usually around page 15-16). Identify the DC offset sensing transistors (often Q501, Q502). The manual provides the voltage table so you can trace whether a shorted output pack or a failed differential pair is causing the fault.