Marantz PM-11S3 Service Manual page 16

Idling Current Adjustment
Digital Voltmeter
V
N7004
8U-110131-2 (R ch)
1. After DC Offset Voltage Adjustment is completed, adjust the Idling Current with the variable resistor V6001 and V7001
on the PWB (8U-110131-1/8U-110131-2).
2. Turn off the power.
3. "+" of Connect Digital Voltage is connected to the No. 1 pin and connected "–" to No. 3 pin of N6004.
4. "+" of Connect Digital Voltage is connected to the No. 1 pin and connected "–" to No. 3 pin of N7004.
5. Before turning on the power, V6001 and V7001 have been counter clockwise turned with the adjustment driver.
6. Turn on the power, VoLUMe is set as -∞.
7. After 1 minutes, with seeing the digital voltage meter turn the variable resister clockwise slowly to adjust the idling
current.
• Idling adjustment with V6001 (V7001).
• Turn V6001 (V7001) clockwise to increase the idling current.
• The adjustment value of idling current is
"15 mV(75 mA) ± 0.5 mV(2.5 mA)" each.
8. After 5 minutes, repeat the same procedure as 7.
• Turn V6001 (V7001) clockwise to increase the idling current.
• The adjustment value of idling current is
"12 mV(60 mA) ± 0.5 mV(2.5 mA)" each.
Adjustment is completed.
9. Remove connection cable, attach the top cover.
Idling current decreases with the temperature rise inside the unit, and it is set to "10mV (50mA)" of setting value in about 30
minutes after turn on the power.
V7002
B E
B E
B E
B E
V6002
V6002
DC
R6026
R6003
Q6014
R6015
Q6004 Q6013 D6008
Q6010
R6013
C6001
Q6009
JV157
C6004
Q6012
Q6001
R6001 R6012
R6025
R6014
R6002 Q6011
JV52 JV96 R6017
R6066
7.5 7.5
JV113
R6064 C6005
7.5
R6065
R6067
R6049
R6042
JV71
17.5 R6046
C6010
R6043
B6001
JV11
R6053
1
JV19
JV139
7.5 17.5
1 N6011 6 1 N6003 6
[Q6035]
[Q6037]
2SA1859
2SA1216
16
Digital Voltmeter
V
V6001
BIAS
C6014
T.P.
Q6021
R6024
Q6030
N6004
Q6027
Q6020
C6013
R6023
JV30
R6041
R6040
R6039
C6012
C6006
D6029
JV138
OUT D6026
R6061
R6057
Z6001
R6056
D6027
R6047
R6052
N6009
6
[Q6031]
JV26
Z6002
2SC4495 7.5
N6002 N6010
1 6 1 6
[Q6036] [Q6034]
2SC2922 2SC4883
8U-110131-1 (L ch)
N6004