Marantz MA6100/N1B, Service Manual

Page: 8 / 11

10
7. POWER AMP. ALIGNMENT
7.1 DC offset Adjustment
Speaker out:non Load
Step Power Adjust. Point Test Point Adjustment Vaule
1 On R708 Speaker Output Terminal 20mV
Note:If the value that measured is not -20mV,no need adjust the DC offset.
7.2 Iding current Adjustment
Speaker out:non Load
Step Power Adjust. Point Test Point Adjustment Vaule
1 Power on R722 J705 or R735
within 1 minute
0.6mV
2
after
4 minutes
R722
J705:4P Connecter
(between 1p-4p)
or
R735:Emitter Resister
(0.1ohms x2)
see table
for adjustment vaule
Time since power on
Idling current adjust.
Time since power on
Idling current adjust.
4m–4m30s 4.6mV 11m-12m 4.9mV
4m30s–5m 4.8mV 12m-14m 4.8mV
5m–5m30s 5.0mV 14m-16m 4.6mV
5m30s–6m 5.1mV 16m-18m 4.5mV
6m–7m 5.2mV 18m-22m 4.4mV
7m-8m 5.2mV 22m-26m 4.3mV
8m-9m 5.2mV 26m-30m 4.2mV
9m-10m 5.1mV More than 40m 4.0mV
10m-11m 5.0mV The taget is 4.0mV
m : minutes
s : seconds
IDLING TEST POINT
IDLING ADJ
DC OFFSET ADJ
REAR SIDE
FRONT SIDE
WA329J101-0/P701
0.5A 125V
+
+
+
+
IDLING ADJ / DC OFFSET ADJ
EXT CONT.IN
INVERT OUTPUT
INPUT
R735
R722
R708
J705