Idling Current Alignment; Time Table Of Idling Current Rise; Power Amplifier Ad Just Ment - Marantz SR7500/A1B Service Manual

3. 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 con-
tact points.
2. After the setup above, turn on the main switch.
3. Adjust variable resistors (VR41, VR42...VR71) accord-
ing to the digital voltmeter readings. The target setting
value is the following table for each channel.
Settings: Master Volume — Minimum
Speaker out — No Load
Top lid — OPEN
Channel Alignment Point
Front L
Center
Front R
Surround L
Surround R
Surround Back L
Surround Back R

Time Table of Idling Current Rise

20 to 30 degrees centigrade
After Turning ON
10 min.
20 min.
30 min.
Measurement Point
VR41 CN41
VR61 CN61
VR51 CN51
VR42 CN42
VR52 CN52
VR62 CN62
VR71 CN71
Ambient temperature
Measurement Voltage
2.4 mV ± 0.3 mV
2.4 mV ± 0.3 mV
2.4 mV ± 0.3 mV
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