Test H: The Subwoofer Is Inoperative

PINPOINT TEST H: THE SUBWOOFER IS INOPERATIVE

H1-H2:

H3-H5:

H6-H7:

H8-H10:

H11-H13:

H14:

Normal Operation
The subwoofer speaker is powered from a separate subwoofer amplifier. On the Freestyle, the subwoofer speaker is integral to the subwoofer amplifier. On all others, there are 2 subwoofer speakers connected to the subwoofer amplifier through circuits 824 (WH/VT), 825 (TN/LG), 826 (DB/OG), and 827 (TN/WH). The enable/clip circuit 174 (GY/BK) carries out 2 functions: to turn on the subwoofer amplifier, and to indicate to the audio unit when the subwoofer output distortion signal reaches a damaging level. The audio unit then reduces the audio output signal to the subwoofer amplifier. The subwoofer amplifier receives voltage on circuit 1678 (WH/VT) and ground on circuit 1204 (BK/OG).

Possible Causes
- Fuse
- Circuit 174 (GY/BK) open or short to ground
- Circuit 176 (PK/LG) open, short to ground or voltage
- Circuit 179 (OG/RD) open, short to ground or voltage
- Circuit 824 (WH/VT) open, short to ground or voltage
- Circuit 825 (TN/LG) open, short to ground or voltage
- Circuit 826 (DB/OG) open, short to ground or voltage
- Circuit 827 (TN/WH) open, short to ground or voltage
- Circuit 1204 (BK/OG) open
- Circuit 1678 (WH/VT) open
- Subwoofer amplifier
- Subwoofer speaker
- Audio unit