Marantz PM-16FN - Service Procedures; Test Equipment and Idling Adjustment

5. F-EAICMERAESR
TEST EQUIPMENT REQUIRED FOR SERVICING
Item Use
Distortion Analyzer Distortion measurements
Sinewave and squarewave signal source
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AC VTVM Voltage measurements (AC)
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Oscilloscope Waveform analysis and trouble shooting and ASO alignment
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DC VTVM!/ & Ti & & Q pl =
AC Wattmeter Monitors primary power to amplifier
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Line Voltmeter Monitors potential of primary power to amplifier
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Variable Autotransfomer Adjust level of primary power to amplifier
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Shorting Plug Shorts amplifier input to eliminate noise pickup
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6. PA KUL Pere FIR 6. IDLING CURRENT ADJUSTMENT
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ADT ARTY b TP1: J704 OME (CLEC E
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PCS 86 659
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(1) Before switching the power ON, set the Master Volume
Control to minimum position. Then, rotate the semi-fixed
resistor R620 on the PC board P601 (L ch) and the semi-
fixed resistor R720 on the PC board P701 (R ch) fully
counterclockwise.
(2) Connect a digital voltmeter, set for DC voltage input, to
the test point connector pin TP 1: J604 on the PC board
P601 (L ch).
Also connect the digital voltmeter, set for DC voltage in-
put, to the test point connector pin TP1: J704 on the PC
board P701 (R ch).
(3) After the completion of the above setup, switch the power
ON, and after 10 minutes, adjust the semi-fixed resistor
R620 on the PC board P601 (L ch) and the semi-fixed
resistor R720 on the PC board R701 (R ch) according to
the reading on the digital voltmeter by rotating each of
them clockwise. Set the reading of the voltmeter for 10
mV (50 mA) on both L ch and R ch.
Note:
Be sure to perform this adjustment with the power supply
AC voltage +1%.
Elapsed time after Idling current setting
More than 10 min. 9.5mV~10mV
(4) In the idling adjustment after heat-running, aging test or
repair, perform the adjustment after leaving the unit for
approx. 10 minutes applying no signal and no load in
power ON condition so that the setting value becomes 10
mV (50 mA).