Audison LRx 4.5 - Idling Current Adjustment

3. Idling Current Adjustment
1. Before adjusting the idling current, turn the amplifier on and let it play for several minutes. When the heat sink
temperature reaches a range between 30 and 45°C (86 ÷ 113°F) that is the optimal condition to perform the adjustment.
2. Disconnect loads and input signals and open the amplifier bottom cover.
3. Take a digital multimeter and set it in continuous voltage. Then connect probes to the Emitter power transistor
leads as shown in the picture.
4. Take a very small screwdriver and adjust the trimmer till you read 5.0 ÷ 6.0 mVDC on the multimeter.
5. Repeat the same procedure for each channel.
Note: Small variations regarding the values indicated, do not cause working defects.
DIGITAL
MULTIMETER
5.5 mVDC
DIGITAL
MULTIMETER
5.5 mVDC
DIGITAL
MULTIMETER
5.5 mVDC
DIGITAL
MULTIMETER
5.5 mVDC
b c e b c e b c e b c e
b c eb c eb c eb c e
B Channel L A Channel L
B Channel R A Channel R
TECHNICAL NOTES
Rev. A
Part 3 page 3 of 3