Rear Side; Front Side - Marantz MM7055/N1B Service Manual

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 (VR11 - VR31) according to the digital voltmeter readings. The target setting value is the
following table for each channel.
Settings : No-signal of input
Speaker out
Top lid
Measurement Point
AMP PWB

Front side

AMP PWB

Rear side

AMP PWB
Time Table of Idling Current Rise
After Turning ON
10 min.
20 min.
30 min.
FAN
(CHANNEL 3)
— No Load
— OPEN
Channel
SL (CHANNEL 3)
SR (CHANNEL 4)
C (CHANNEL 5)
FL (CHANNEL 1)
FR (CHANNEL 2)
Ambient temperature
20 to 30 degrees centigrade
Measurement Voltage
1.5 mV ± 0.2 mV
1.5 mV ± 0.2 mV
1.5 mV ± 0.2 mV
FL
(CHANNEL 1)
VR31
CN32
REAR SIDE
POWER AMP MODULE
MAIN HEAT SINK
FRONT SIDE
SL
(CHANNEL 4)
VR21
CN22
Adjustment VR Measurement Point
VR21
VR31
VR11
VR31
VR21
FR
(CHANNEL 2)
VR21
CN22
SR
VR31
CN32
22
CN22
CN32
CN12
CN32
CN22
C
(CHANNEL 5)
VR11
CN12