Marantz SR7300 - 11. Power Amplifier Adjustment; Idling Current Alignment

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11. 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 and heat up the amplifi er about 10 minutes.
3. Adjust variable resistors (R137, R138…R338) according to the digital voltmeter readings. The target setting value is 4.9
mV +/- 0.05 mV for each channels.
Settings : Master Volume --- Minimum
Speaker out --- No Load
Top lid --- OPEN
Channel
Alignment
Point
Measurement
Point
Front L R137 J107
Center R337 J106
Front R R273 J103
Surr. L R138 J105
Surr. R R238 J108
SB R338 J104
Time Table of Idling Current Rise
After Turning ON
Measurement Voltage
(R***)
5 min. 4.5 mV
10 min. 4.9 mV
20 min. 5.5 mV
30 min. 6.2 mV
40 min. 6.8 mV
60 min. 7.0 mV
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