Marantz PM65 - Page 4

MODEL PM-65AV STEREO AMPLIFIER
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1. P.W. BOARDS
As can be seen from the circuit diagram the chassis of
Model PM-65AV consists of the following units. Each unit
mounted ona printed circuit board is described within the
square enclosed by a bold dotted line on the circuit
diagram.
1. Tone Amp........... mounted on P.W. Board PE01
2. Master Volume....... mounted on P.W. Board PG01
3. Tape VCR Monitor. . .. mounted on P.W. Board PJ01
4. Video Buffer Amp ....mounted on P.W. Board PL0O1
5. Front Switch......... mounted on P.W. Board PS01
6. TV Remocon out
JOCK ok sedeelicales mounted on P.W. Board PT01
7. Input Selector,
Phono ............. mounted on P.W. Board PV01
8. Headphone,
Speaker Switch ..... mounted on P.W. Board PW01
9. Input Selector
Indicator ........... mounted on P.W. Board PY01
10. Function LED
Indicator ........... mounted on P.W. Board PY51
11. Main Amp........... mounted on P.W. Board P701
12. Power Supply ....... mounted on P.W. Board P801
13. Power Switch ....... mounted on P.W. Board P901
MZ 1846
2. MAIN AMP ADJUSTMENT PROCEDURE
1.
Test Points
Left channel: J705 (+), J707 (—)
Right channel: J706 (+), J708 (—)
. Adjustment Points
Left channel: R719 2.2k ohm variable resistor
Right channel: R720 2.2k ohm variable resistor
. Adjustment Procedure
(1) Before turning on the set’s power, turn variable
resistors R719 and R720 in the direction in which
the current does not flow (clockwise for R719,
counterclockwise for R720).
(2) Connect the DC digital voltmeter to the test points
with the proper polarities. (Adjust both channelsat
once.)
(3) Set the set’s volume to minimum, the speaker
terminals to no load, and the input to open.
(4) Set the following after turning on the power:
After 30 seconds: 8 to 9 mV (22 to 25 mA)
After 1 minute: 9 to 10 mV (25 to 27 mA)
Be sure to set for 9 to 10 mV (25 to 27 mA) when the
circuitry becomes stable.
. Notes
When readjusting sets which have been heated up for
repairs, etc., conduct a heat run at an idle for about 10
minutes, then set for 9 to 10 mV (25 to 27 mA).