Master Electronics Repair !

Welcome to Master Electronics Repair! website.Here you will find:Service Modes, Circuit Diagrams,Service manuals, Firmware Update procedure, Disassemble procedure, Universal remote control setup codes, Troubleshooting, Diagnosing, Measuring, and more.... of many of LCD/LED TV/Displays,others various electronic apparates,trough many technical notes and tips/tricks to help repairing/fixing Troubles/ faults,for electrical technicians.This site helps you to save the Earth from electronic waste!

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!

Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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Note that if you don't find what you searched for, try it after a period of time; the site is a never ending job !

..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Friday 8 March 2019

MARANTZ SR4400 AV SURROUND RECEIVER IDLE CURRENT ADJUSTMENT RESET AND ERRORS

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.