Idling Current Alignment - Marantz PM8004 Service Manual

ADJUSTMENT

IDLING CURRENT ALIGNMENT

Digital Voltmeter
L ch
T.P. ADJ
J707 R707
P701
Adjustment Procedure
Set the power voltage to rated voltage for this adjustment.
(1) Adjust the Idling Current with the variable resistor R707 and R708 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 J707.
(4) "+" of Connect Digital Voltage is connected to the No. 1 pin and connected "-" to No. 2 pin of J708.
(5) Before turning on the power, R707 and R708 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 R707 (R708).
• Turn R707 (R708) clockwise to increase the idling current.
• The adjustment value of idling current is 3 mV(15 mA) ± 0.5 mV(2.5 mA) each.
(8) After 6 minutes.
Repeat the same procedure as 7.
• The adjustment value of idling current is 12.5 mV(62.5 mA) ± 0.5 mV(2.5 mA) each.
Adjustment is completed.
(9) Remove connection cable, attach the top cover.
NOTE : I dling current decreases with the temperature rise inside the unit, and it is set to 10 mV (50 mA) of setting value
in about 30 minutes after turn on the power.
V
33
Digital Voltmeter
V
R ch
ADJ T.P.
R708 J708