Marantz SR4500 - 9. Power Amplifier Adjustment; Idling Current Alignment

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Channel
Measuremet
Point Point
Surround Left CN61 VR81
Center CN61 VR81
Surround Right CN61 VR81
Front Left CN61 VR81
Surroud Back Left CN61 VR81
Front Right CN61 VR81
After Turning ON
Time Table of Idling Current Rise DC voltmeter........Connect to CN61
Measurement Voltage
12.0 mV ±
0.5 mV
13.0 mV ±
0.5 mV
13.0 mV ± 0.5 mV
13.2 mV ±
0.5 mV
13.4 mV ±
0.5 mV
13.5 mV ± 0.5 mV
(CN61)
Alignment
10 min
20 min
30 min
40 min
50 min
5 min
Surroud Back Right
No.
1
2
3
4
5
6
7 CN61 VR81 13.5 mV ± 0.5 mV 60 min
9. 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 (VR81) 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