Alignments; Idling Current Adjustment; Adjustment Procedure - Marantz PM7001 series Service Manual

2. ALIGNMENTS

Idling Current Adjustment

Digital Voltmeter
V
L ch
T.P. ADJ
J759 R753
P701

Adjustment Procedure

Set the power voltage to rated voltage for this adjustment.
1. Adjust the Idling Current with the variable resistor R753
and R754 on the PWB P701.
2. Turn off the power.
3. "+" of Connect Digital Voltage is connected to the No. 1
pin and connected "-" to No. 2 pin of J759.
4. "+" of Connect Digital Voltage is connected to the No. 1
pin and connected "-" to No. 2 pin of J760.
5. Before turning on the power, R753 and R754 have been
counter clockwise turned with the adjustment driver.
6. Turn on the power, VOLUME is set as - .
7. After 2 minutes.
With seeing the digital voltage meter turn the variable
resister clockwise slowly to adjust the idling current.
Idling adjustment with R753 (R754).
• Turn R753 (R754) clockwise to increase the idling
current.
• The adjustment value of idling current is
4 mV(20 mA) ± 0.5 mV(2.5 mA) each.
8. After 7 minutes.
Repeat the same procedure as 7.
• The adjustment value of idling current is
12 mV(60 mA) ± 0.5 mV(2.5 mA) each.
1 P701
2 OFF
J759
3 P701
"+" 2
4 P701 J760
"+" 2
5
6
7
P701 J759 J760
• R753 R754
•
"4 mV(20 mA) ± 0.5 mV(2.5 mA)"
8. " 7 "
7.
•
"12 mV(60 mA) ± 0.5 mV(2.5 mA)"
2
Digital Voltmeter
V
R ch
ADJ
R754
R753 R754
J759 1
"-"
J760 1
"-"
R753 R754
-
R753 R754
T.P.
J760