Electrical Adjustment - Marantz MM9000 Service Manual

8. ELECTRICAL ADJUSTMENTS
1. DC offset adjustment
Master Volume : Minimum, Speaker out : non Load
Adjustment
Step Power Channel
Point
Front L R715
Center RT15
1 on Front R RP16
Surr. L RP15
Surr. R R716
Note : If the measured value is not exceed ±20mV, no need to adjust the DC offset.
2. Iding current adjustment
Master Volume : Minimum, Speaker out : non Load
Adjustment
Step Power Channel
Point
Front L R743
Center RT43
1 Power on
Front R RP44
Surr. L RP43
Surr. R R744
J***:4P Connecter
after
2
4 minutes
R***:Emitter Resister
Time since power on Idling current adjust.
4– 4 minutes 30 seconds 5.6mV
4m30s– 5 minutes 6.4mV
5– 5 minutes 30 seconds 7.2mV
5m30s– 6 minutes 7.7mV
6– 7 minutes 8.2mV
7-8 minutes 8.6mV
8-9 minutes 8.8mV
9-10 minutes 8.6mV
10-11 minutes 8.4mV
3. Thermostat circuit confirmation
1) When the product is POWER ON, remove the wire W701 from the connector J715 (P704).
2) Confirm the main rely is off.
3) Connect the wire W701 to the connector J715 (on P704).
4) Confirm the main relay is on.
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Test Point Adjustment Vaule
Speaker Output
±
20mV
Terminal
Adjustment
Test Point
Vaule
J713 or R773
JT13 or RT73 within 1 minute
JP04 or RP74 0.4mV
JP03 or RP73
J714 or R774
see table
(between 1p-4p) for adjustment
vaule
(0.1ohms x2)
Time since power on Idling current adjust.
11-12 minutes 8.0mV
12-14 minutes 7.6mV
14-16 minutes 7.2mV
16-18 minutes 6.5mV
18-22 minutes 5.6mV
22-26 minutes 4.9mV
26-30 minutes 4.4mV
more than 30 minutes 4.0mV
The taget is 4.0mV
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4. Cooling fan confirmation
4.1 Fan failure sensor confirmation
1) Set to be SPK output 1W from the front channel.
2) Connect the 1pin (LOCK) of the connecter JN10 (on P754) to chassis (GND level) by a wire.
3) After 6 seconds the SPK relay works, and the SPK output isn't output.
4.2 Temperature sensor confirmation
1) Connect a resistor (470ohms 1W) between JN10 3pin (T-2CH) and DC +12V.
2) Confirm the cooling fan starts working. (Status : JN09 between 1pin and 2pin = +7.5V, Fan speed = Low)
3) Remove the resistor.
4) Confirm the cooling fan stops.
5) Connect the resistor between JN10 4pin (T-3CH) and DC +12V.
6) Confirm the cooling fan starts working again.
7) Remove the resistor.
8) Confirm the cooling fan stops.
9) Connect the resistor between JN10 3pin (T-2CH) and DC +12V. And then connect another resistor between
JN10 4pin (T-3CH) and DC +12V.
10) Confirm the cooling fan starts working.
11) And then connect the resistor between JN10 2pin (SPEED) and DC +12V.
12) Confirm the cooling fan changes to work with high speed. (Status : JN09 between 1pin and 2pin = +11.5V,
Fan speed = High)
4.3 Fan catching a foreign body sensor confirmation
1) Connect the resistor (470ohms 1W) between JN10 3pin (T-3CH) and DC +12V.
2) Confirm the cooling fan starts working. (Status : JN09 between 1pin and 2pin=+7.5V, Fan speed = Low)
3) Set to be SPK output 1W from the front channel.
4) Hold the cooling fan by hand and stop it.
Notes: Take care of wound in the hand!
5) After 6 seconds the SPK relay works and the SPK output isn't output.
RT73
JT13
C CH
SL CH
WA300J101
P754
JP04
JP03
IDLING
RP43
RP73
FRONT
J713
R773
R774
J714
SR CH FL CH
WA300J102
P704
TOP
FR CH
DL NG
RP44
RP74
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