Marantz 74 PM40 - Exploded View and Parts List; Idling Current Adjustment; How to Change the Supply Voltage

3. EXPLODED VIEW AND PARTS LIST
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MZ 2629 -13-
MARA-00579 / Druck 8
PART NO. DESCRIPTION
001B
— 003B
0108
011B
0128
013B
014B
002D
001F
005G
010G
- 902G
902G
-001P
AFOO1
FOO2
A J001
J031
A J091
JO92
AJ903
A L001
$011
001T
4822 425 40177
4822 425 40178
4822 459 10943
4822 413 41544
4822 413 41545
4822 413 41589
4822 413 31551
4822 410 60395
4822 410 60343
4822 501 11008
4822 466 92914
4822 462 41477
4822 404 60628
4822 532 60948
4822 532 61184
4822 401 11351
4822 253 30191
4822 253 30027
4822 256 30233
4822 290 40297
4822 272 10227
4822 265 10092
4822 264 30313
4822 146 21552
4822 146 21555
4822 273 10214
4822 736 20695
4822 736 20715
Front Panel Assembly
/00B/01B/02B/05B/07B
Front Panel Assembly
/10B/12B/15B/17B
Badge
Knob, Volume
Knob, Selector
Knob, Tone/Balance
/00B/01B8/02B/05B/07B
Knob, Tone/Balance
/10B/12B/15B/17B
Button, Power
Button, Speaker
Screw
Sheet, DENKA
Leg
Link, Power Switch
Bushing, AC Cord
/00B/01B/02B/07B/10B/12B/17B
Bushing, AC Cord /05B/15B
Clamper, Phono Jack
250V /01B
250V /01B
Fuse, T1.6A
Fuse, 13.15A
Jack, Fuse Holder /01B
Terminal, GND
Voltage Selector /01B
Jack, AC Adapter /01B
Jack, AC Outlet
Power Transformer
/00B/028/05B/07B/10B/12B/15B/
17B
Power Transformer /01B
Rotary Switch, Selector
User Manual
/008/01B/02B/05B/07B
User Manual /10B/12B/15B/17B
4. IDLING CURRENT ADJUSTMENT
(1) Before switching the power ON, set the Master Volume
control to the minimum position and the Balance and
Tone controls to the center positions. Also set semi-fixed
resistors R755 (L_ CH) and R756 (R CH) on PCB P701 to
the center positions.
(2) Each of the cement resistors R767 (L_ CH) and R768 (R
CH) on the PCB P7011 is provided with three test points.
Connect a digital voltmeter, set for the DC voltage input,
to the test points at the two extremities of the three
test points of R767 or R768.
(3) After the-setup above, switch the power ON and adjust
semi-fixed resistor R755 (L CH) or R756 (R CH) on
PCB P701 according to the digital voltmeter reading.
The target setting value is 14 mV (38.9 mA) for both the
L CH and R CH.
Please refer to the table below.
Elapsed time after power ON idling current setting value
10.5 mV
14 mV © More than 4min. |
Note on Safety:
Symbol A Fire or electrical shock hazard. Only original
parts should be used to replace any part marked with
symbol A. Any other component substitution (other
than original type), may increase risk of fire or electrical
shock hazard.
5. HOW TO CHANGE THE SUPPLY VOLTAGE
(/00B/02B/05B/07B/10B/12B/15B/17B Versions)
With the /05B/07B/15B/17B Versions, the rated supply
voltage of 240V can be changed to 220V. In the same_ way,
the 220V rated supply voltage of the /O00B/02B/10B/ 12B
Versions can be changed to 240V.
Refer to the following diagram for the voltage change pro-
cedure.