Marantz PM8005 Service Manual page 20

Idling Current Adjustment
Digital Voltmeter
V
V7001
N7007
N7007 V7001
1. After DC Offset Voltage Adjustment is completed, adjust the Idling Current with the variable resistor V7001 and V7002
on the PCB P2(8U-110150-2).
2. Turn off the power.
3. "+" of Connect Digital Voltage is connected to the No. 1 pin and connected "–" to No. 2 pin of N7007.
4. "+" of Connect Digital Voltage is connected to the No. 1 pin and connected "–" to No. 2 pin of N7008.
5. Before turning on the power, V7001 and V7002 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 V7001 (V7002).
• Turn V7001 (V7002) clockwise to increase the idling current.
• The adjustment value of idling current is
"10 mV(50 mA) ± 0.5 mV(2.5 mA)" each. f
8. After 5 minutes, repeat the same procedure as 7. f
Turn V7001 (V7002) clockwise to increase the idling current.
•
• The adjustment value of idling current is
"17 mV(85 mA) ± 0.5 mV(2.5 mA)" each. f
Adjustment is completed.
9. Remove connection cable, attach the top cover.
NOTE : Idling current decreases with the temperature rise inside the unit, and it is set to "14 mV (70mA)" of setting value
in about 30 minutes after turn on the power. f
8U-110150-2
20
Digital Voltmeter
V
V7002
N7008
V7002 N7008