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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..............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!

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Wednesday 6 March 2019

DENON AVR-2308 - AVR-888 INITIALIZATION - FACTORY RESET - TEST MODE - ERROR DISPLAY - IDLE CURRENT ADJUSTMENT - AV RECEIVER REPAIR AND SERVICE - MANUAL TIPS

DENON AVR-2308 - AVR-888 Initialization - Factory Reset - Test mode - Error display - Idle current adjustment - AV Receiver Repair and Service - Manual Tips

Category: AV Receiver Repair and Service

Contents of this article

Initialization procedure
Accessing Test mode
Idle current adjustment

DENON AVR-2308 - AVR-888

Initialization (Factory Reset)
AV SURROUND RECEIVER/AMPLIFIER initialization should be performed when the µcom, peripheral parts of µcom, and Digital P.W.B. are replaced.
1. Switch off the unit.
2. Hold the following SPEAKERS-A button and SPEAKERS-B button, and switch on the unit.
3. Check that the entire display is flashing with an interval of about 1 second, and release your fingers from the 2 buttons and the microprocessor will be initialized.

Note: If step 3 does not work, start over from step 1.
# All user settings will be lost and this factory setting will be recovered when this initialization mode. So make sure to memorize your setting for restoring after the initialization.

JIG to use for servicing
When you repair the printing board, you can use the following JIG (Extention cable kit). Please order to Denon Official Service
Distributor in your region if necessary.
00D SPK- 561 EXTENSION UNIT KIT : 1 Set
00D SPK- 562 TUCP CONN. JOINT KIT : 1 Set

CHECK WITH TEST MODE
ucom/DSP Error Display Mode
1. Operation Spec
µcom version display mode:
When the following conditions are satisfied at its starting state, error information is displayed before version information.
Starting method (same as µcom version display):
E3,JP model
While pressing 2 buttons, "STATUS " and "DIMMER ", turn on on/off button.
Then, press "STATUS" button to display the following information on the FL Display.
E2,E2A model
While pressing 2 buttons, "RT " and "PTY ", turn on on/off button.
Then, press "PTY" button to display the following information on the FL Display.

2. Display Order
Error information > Destination information > Main-µcom version information > Sub-µcom version information > DSP version information

3. Display
Any one of the following list is displayed, in the priority of 1,2,3,4

Condition	State	Display
1.Sub-µcom NG	No response from Sub-µcom	" ＳＵＢＥＲＲＯＲ０１ "
2. DIR NG	No response from DIR	" ＤＩＲＥＲＲＯＲ０１ "
3. DSP1 NG	When DSP boot, executing DSP reset makes no change to BUSY port "L".	" ＤＳＰ1 ＥＲＲＯＲ０１ "
	No change to BUSY port "L" before issuing DSP command.	" ＤＳＰ1 ＥＲＲＯＲ０２ "
	When DSP data read, executing WRITE="L" makes no change to ACK="H".	" ＤＳＰ1 ＥＲＲＯＲ０３ "
	When DSP data read, executing REQ="L" makes no change to ACK="L".	" ＤＳＰ1 ＥＲＲＯＲ０４ "
	When DSP data write, executing WRITE="H" makes no change to ACK="H".	" ＤＳＰ1 ＥＲＲＯＲ０５"
	When DSP data write, executing REQ="L" makes no change to ACK="L".	" ＤＳＰ1 ＥＲＲＯＲ０６ "
	When DSP special code boot, executing DSP reset makes no change to BUSY port "L".	" ＤＳＰ1 ＥＲＲＯＲ１１ "
	No change to BUSY port "L" before issuing DSP special read command.	" ＤＳＰ1 ＥＲＲＯＲ１２"
	No change to BUSY port "L" before DSP version read.	" ＤＳＰ1 ＥＲＲＯＲ１３ "
4. Both SUB/DSP OK		(No error display, version display only)

ADJUSTMENT
Audio Section
Idling Current (1U-3854-1)
Required measurement equipment: DC Voltmeter
Preparation
(1) Avoid direct blow from an air conditioner or an electric fan, and adjust the unit at normal room tempereture 15°C > 30°C (59°F > 86°F).
(2) Presetting
POWER (Power sourse switch) OFF
SPEAKER (Speaker terminal) No load
(Do not connect speaker, dummy resistor, etc.)
Adjustment
(1) Remove top cover and set VR401, VR402, VR403,
VR404, VR405, VR406, VR407, on 1U-3854-1 (Power Amp Unit) at fully counterclockwise .
(2) Connect DC Voltmeter to test points (FRONT-Lch: CX063 3,4 pin, FRONT-Rch: CX063 1,2 pin, CENTER ch: CX063 5.6 pin, SURROUND-Lch: TP102 3, 4 pin, SURROUND-Rch: CX082 1,2 pin,
SURROUND BACK-Lch: CX082 7,8 pin, SURROUND BACK-Rch: CX082 5, 6 pin).
(3) Connect power cord to AC Line, and turn power switch "ON".
(4) Presetting.
MASTER VOLUME : "---" counterclockwise ( min.) MODE : 7CH STEREO FUNCTION : CD
(5) Allow 2 minutes, and turn VR401 clockwise to adjust the TEST POINT voltage to 6.5 mV ± 0.5 mV DC.
(6) After 10 minutes from preset, turn VR401 to set the voltage to 8 mV ± 0.5 mV DC.
(7) Adjust the Variable Resistors of other channels in the same way.
(8) After 5 minutes from (6), turn VR401 to set the voltage to 8 mV ± 0.5 mV DC.
(9) Adjust the Variable Resistors of other channels in the same way.

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