Technics SL-HD301, Service Manual

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4. Turn on the power of the Amplifier (SE-HD501).
5. Press INPUT SELECTOR to select the external source (EXT) of the
Amplifier (SE-HD501).
6. Input a sound signal to external input terminal of Tuner (ST-
HD501), and confirm to be outputted from the speaker. (Both
“High” and “Low”.)
Fig. 1
7. Schematic Diagram Notes
7.1. Type Illustration of IC’s, Transistors and Diodes
7.2. Schematic Diagram Notes
- This schematic diagram may be modified at any time with the
development of new technology.
Notes:
- S301: Power "STANDBY / ON" switch in “OFF” position.
- S302: Eco mode switch in “OFF” position.
- S303: Source input select control ( ) switch.
- S304: Source input select control ( ) switch .
- S305: Bass (BLFS) switch in “OFF” position.
- VR301: Main control V.R.
- VR401: Fine tweeter control V.R.
- Indicated voltage values are the standard values for the unit