Power Amplifier Adjustment; Idling Current Alignment; Heat Sink Ass'y - Marantz SR6004 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 contact points.
2. After the setup above, turn on the main switch.
3. Adjust variable resistors (VR60 - VR66) 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
VR63
DC voltmeter
NO. Channel
1 Surround Right
2 Surround Left
3 Center
4 Front Left
5 Surround Back Left
6 Front Right
7 Surround Back Right
DC
VOLTMETER
+
TEST POINT
3
2
1
CN70 CN71 CN74
VR64 VR65

HEAT SINK ASS'Y

Measurement Alignment
Point point
CN70 VR63
CN71 VR64
CN74 VR65
CN72 VR60
CN75 VR61
CN73 VR66
CN76 VR62
MAIN PWB
CUP12206Z
4 5
CN72 CN75
VR60 VR61 VR66
Time Table of Idling Current Rise
After Turning ON
5 min
10 min
20 min
30 min
40 min
50 min
60 min
15
s
6 7
CN73 CN76
VR62
Measurement Voltage
(CN7X)
7.5 mV 0.5 mV
7.5 mV 0.5 mV
7.5 mV 0.5 mV
7.5 mV 0.5 mV
7.5 mV 0.5 mV
7.5 mV 0.5 mV
7.5 mV 0.5 mV