Tuesday, December 08, 2015

MARANTZ SR4400 AV surround receiver idle current adjustment reset and errors



Contents of this article 

  • Adjusting the idle current 
  • Dc offset setting 
  • Resetting the amplifier 
  • System errors

MARANTZ SR4400 

AV SURROUND RECEIVER 

SERVICE PROCEDURE
Idling current Alignment
1. Each of cement resistors are provided with two test points. Set a voltage meter to DC voltage input,
Connect the digital voltage meter to the two test points on a cement resistor.
2. After the setup above, turn the main switch ON and heat up the amplifier about 10 minutes.
3. Adjust variable resistors (RM114, RM214, ..., RM614) according to the digital voltmeter reading.
The target setting value is 5 ±1mV for each channels.
Settings: Master Volume --- Minimum
Speaker out --- No Load
Top lid --- Open
Channel
Alignment Point
Measurement Point
Front L
RM514
JM501
Center
RM114
JM101
Front R
RM314
JM301
Surr. L
RM414
JM401
Surr. R
RM214
JM201
SB
RM614
JM601

DC Offset Alignment
Settings: Master Volume --- Minimum
Speaker out --- No Load
Power
Channel
Adjustment Point
Measurement Point
Alignment Target
On
Front L
RM506
Speaker
Output
Terminal
0 ±40mV
Center
RM106
Front R
RM306
Surr. L
RM406
Surr. R
RM206
SB
RM606

Micro-Prosessor (ICS18) Version and FLD Segment Check
1. While the power is on, press the CD, TUNER and TUNIGNG UP buttons simultaneously for more than
3 seconds. The FL display shows "SERVICE MODE" for 2 seconds then is shows the model name
(Ex.: "SR4400" ).
2. Press the MODE button. The software version of the micro-processor (ICS18) will display.
3. Press the MODE button again. The left half and the right half of the label area in the FLD light on and off each other.
4. Press the MODE button again. The segments of the charactor area in the FLD filck in the checker pattern.
5. Press the MODE button two times to quit this mode.
Product Reset
To reset the buck-up memory in the unit to the default status, follow the procedure below.
1. While the power is on, press the CLEAR and MEMORY buttons simultaneously for more than 3 seconds.
2. The FL display shows "DEFAULT". Then the power is turned off once and turned on again automatically. The micro-computer is reset, the EEPROM is cleared and the unit returns to the normal operation.
Note: When the unit is shipped from the factory, the procedure above must be done to set the unit to initial status after the tests.
SYSTEM ERROR
When the micro-computer detects a trouble, the following information is displayed on the FLD.
1. Trouble in DSP
If communication with DSP1(Q610) is troubled more than 2 seconds, FLD shows below.
ERROR DSP ROM
2. Trouble in EEPROM
If data from EEPROM (ICS21) does not match, FLD shows below.
CLEAR MEMORY
3. Trouble in EEPROM I/F
If communication with EEPROM(ICS21) is troubled more than 2 seconds, FLD shows below.
ERROR EEPIF
4. Trouble in 5V Supply
If 5V supply to DIGITAL/AUDIO PCB is troubled, FLD shows below.
ERROR POW 5V
5. Trouble in 5V Supply
If 5V supply to P604(DSP/CPU PCB) is troubled, FLD shows below.
PROTECT
If a trouble is detected upon turning on the power, CPU turns off the speaker relay. And if the trouble is not recovered within 2 seconds, CPU turns the unit into stand-by. If DC offset or over current is detected while the power is on, CPU turns off the speaker relay. If overheat or some trouble is detected on the main transformer, CPU turns the unit into stand-by immediately.