Power Amplifier Adjustment - Marantz SR4023 Service Manual

2. POWER AMPLIFIER ADJUSTMENT

Idling Current Alignment
1. Each of the measurement points are provided with the two test points. Set a digital Voltage meter to DC voltage input,
connect the meter to the test points at both contact points.
2. After the setup above, turn on the main switch.
3. Adjust variable resistors (VR51 - VR61) according to the digital voltmeter readings. The target setting value is the
following table for each channels.
Settings :
Master Volume — Minimum
Speaker out — No Load
Top lid — OPEN
Time Table of Idling Current Rise
Channel Alignment Point
L ch VR51
R ch VR61
Ambient temperature
After Turning ON 20 to 30 degrees centigrade
Measurement Voltage
10 min.
20 min.
30 min.
Measurement Point
CN51
CN61
5 mV ± 0.5 mV
5 mV ± 0.5 mV
5 mV ± 0.5 mV
2