Test F: The Subwoofer Is Inoperative/Does Not Operate Correctly - Audiophile

PINPOINT TEST F: THE SUBWOOFER IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - AUDIOPHILE

F1-F2:

F3-F5:

F5-F7:

F7-F10:

Normal Operation
The audio unit sends audio signals to the subwoofer amplifier through circuits VME22 (VT/GN) and RME22 (GN/WH). The enable/clip circuit SME23 (VT/RD) serves 2 functions: to enable the subwoofer amplifier, and to detect an overload condition. When an overload condition is present, the audio unit clips the signal to the subwoofer amplifier (heard as distortion). The subwoofer amplifier receives voltage through circuit SBP12 (GN/RD), and ground through circuit GD103 (BK/BU).

Possible Causes
- Fuse
- Circuit GD103 (BK/BU) open
- Circuit RME22 (GN/WH) open, short to ground or voltage
- Circuit SBP12 (GN/RD) open
- Circuit SME23 (VT/RD) open, short to ground or voltage
- Circuit VME22 (VT/GN) open, short to ground or voltage
- Subwoofer speaker
- Subwoofer amplifier
- Audio unit