
HTPS-400 ADJUST BIAS PROCEDURE
(Mandatory when any output MOSFET transistors Q305,310,320,321,306,307,311,312 are replaced)
1. Amplifier should be unplugged and OFF.
2. Remove Amp assembly from cabinet.
3. Identify the Linear board assembly (PCB with the output transistors)
4. Adjust RP301 and RP302 fully Counter Clockwise. See diagram below.
5. Apply 120 VAC power to unit.
6. Verify LED is ON.
7. Connect voltmeter set to DC millivolt range to twin pins on terminal J303, on Linear board.
8. Verify initial voltage is less then 0.1 mV.
9. Adjust RP301 Clockwise until voltmeter reads
0.3 mV
+ the initial current from step #8.
10. Adjust RP302 Clockwise until voltmeter now reads
0.6 mV
+ the initial current from step #8.
11. Turn amplifier OFF. Disconnect AC power to unit.
12. Remove voltmeter from terminal J303.
13. Replace amp assembly back into cabinet.
Summary of Contents for HTPS-400
Page 4: ...HTPS 400 SUBWOOFER 4 Detailed Specifications ...
Page 5: ...HTPS 400 SUBWOOFER 5 Detailed Specifications Cont ...
Page 6: ...HTPS 400 SUBWOOFER 6 Connections ...
Page 7: ...HTPS 400 SUBWOOFER 7 Connections Cont ...
Page 8: ...HTPS 400 SUBWOOFER 8 Operation ...
Page 9: ...HTPS 400 SUBWOOFER 9 Troubleshooting ...
Page 10: ...Amplifier Block Diagram HTPS 400 SUBWOOFER 10 ...
Page 11: ...HTPS 400 SUBWOOFER 11 Packaging ...
Page 23: ...HTPS 400 SUBWOOFER 23 Integrated Circuit Diagrams ...
Page 24: ...HTPS 400 SUBWOOFER 24 Feature Board Assembly PCB ...
Page 25: ...HTPS 400 SUBWOOFER 25 EMI FILTER Board Assembly PCB ...
Page 26: ...HTPS 400 SUBWOOFER 26 LINEAR Board Assembly PCB ...
Page 27: ...HTPS 400 SUBWOOFER 27 Power Supply Assembly PCB ...
Page 28: ...Feature Board Assembly Schematic HTPS 400 SUBWOOFER 28 ...
Page 29: ...Feature Board Assembly Schematic Cont HTPS 400 SUBWOOFER 29 ...
Page 30: ...EMI Filter PCB HTPS 400 SUBWOOFER 30 ...