IL50 ADJUST BIAS PROCEDURE
(Mandatory when any output MOSFET transistors Q3,4,7,8 are replaced)
1. Amplifier should be unplugged and OFF.
2. Remove Amp assembly from cabinet; remove rear plastic cover if present. All wires exiting
the cover can remain connected unless they will prevent you from removing the amplifier or
accessing potentiometers on the Linear board PCB in the following steps.
3. Locate the Linear board assembly (PCB with the output transistors)
4. Adjust R11 and R27 fully Counter Clockwise. See diagram below.
5. Apply 120 VAC power to unit, Turn power switch ON.
6. Verify LED illuminates on the front gain control dial unless you have disconnected the plug.
7. Remove shorting plug on terminal J7 on Linear board, and insert current meter, set to the
low mA range.
8. Verify initial current is less then 1 mA.
9. Adjust R11 Clockwise until current meter reads
5 mA
+ the initial current from step #8.
10. Adjust R27 Clockwise until current meter now reads
10 mA
+ the initial current from step #8.
11. Turn amplifier OFF. Disconnect AC power to unit.
12. Remove current meter; insert shorting plug back in terminal J7.
13. Replace cover (if present), wires if disconnected, and replace amplifier back into cabinet.
17
Summary of Contents for IL50 L/R
Page 4: ...Detailed Specifications IL50 L R 4...
Page 5: ...IL50 L R 5 Detailed Specifications Cont...
Page 6: ...IL50 L R 6 Controls and Connections Cont...
Page 7: ...IL50 L R 7 Controls and Connections...
Page 8: ...IL50 L R 8 Controls and Connections Cont...
Page 9: ...IL50 L R 9 Controls and Connections Cont...
Page 10: ...IL50 L R 10 Operation Bass Optimization SystemTM...
Page 15: ...IL50 L R 15 Service Tips...
Page 18: ...IL50 L R 18 Packaging...
Page 19: ...IL50 L R 19 EMI Filter PCB...
Page 20: ...IL50 L R 20 Feature PCB...
Page 21: ...IL50 L R 21 Linear PCB...
Page 22: ...IL50 L R 22 Volume Control PCB...
Page 23: ...IL50 L R 23 Power Supply PCB...
Page 24: ...IL50 L R 24 RABOS PCB...
Page 25: ...IL50 L R 25 IL50 Electronic Parts List Part Reference Designator Qty Description...
Page 26: ...IL50 L R 26 IL50 Electronic Parts List Cont Part Reference Designator Qty Description...
Page 27: ...IL50 L R 27 IL50 Electronic Parts List Cont Part Reference Designator Qty Description...
Page 28: ...IL50 L R 28 IL50 Electronic Parts List Cont Part Reference Designator Qty Description...
Page 29: ...IL50 L R 29 IL50 Electronic Parts List Cont Part Reference Designator Qty Description...
Page 30: ...IL50 L R 30 IL50 Electronic Parts List Cont Part Reference Designator Qty Description...
Page 31: ...IL50 L R 31 Integrated Circuit Diagrams...
Page 33: ...IL50s 33 Feature Main Schematic...
Page 34: ...IL50s 34 Feature Main Schematic Cont...
Page 35: ...IL50s 35 Linear PCB Schematic...
Page 36: ...IL50s 36 250W Domestic Main Power Supply Schematic...
Page 37: ...IL50s 37 Feature RABOS Schematic...
Page 38: ...IL50s 38 Interlude Volume and EMI Filter Schematic...
