Sony MHC- V41D HOME AUDIO SYSTEM disassembly procedure, self diagnostic function, destination setting method

AEP Model,UK Model, Australian Model, Latin American Model

Model Name Using Similar Mechanism:  MHC-V44D/V50D

DVD Mechanism Type: CDM90-DVBU204

Optical Pick-up Block Name;  CMS-S76RFS7G1 or CMS-S76RFS7GP

Self-diagnosis function

When letters/numbers appear on the TV screen or the display
When the self-diagnosis function is activated to prevent the system from malfunctioning, a service number appears. The service number consists of an alphabet and numerals (e.g. C 13 50). See the following table for the cause and corrective action.

C 13: This disc is dirty.
t Clean the disc with a soft cloth.

C 31: The disc is not inserted correctly.
 Turn off the system, then turn it back on again. Then re-insert the disc correctly.

E XX (XX is a number):

To prevent a malfunction, the system has performed the self-diagnosis function.
Contact your nearest Sony dealer or local authorized Sony service facility and give the 5-character service number.
Example: E 61 10.

IMPORTANT NOTE OF PERFORMING THE OPERATION CHECK
When performing the operation check of this unit, be sure to perform the operation check after checking that it is in the following state.

Heat sink is installed to MOTHER board
• Fan motor is connected to MOTHER board
Note: If turn the power on in the state that heat sink is not installed, there is a possibility of damage.
Also, be sure to perform the operation check in the connect the fan motor to the MOTHER board, and the fan motor is rotating state.
If it is necessary to perform the operation check with the heat sink removed or the fan motor removed, set the volume to 10 or less and perform the operation check within 1 minute.

If “PROTECTX” (X is a number) APPEARS ON THE DISPLAY, THEN “CHECK MANUAL” FLASHES ON THE DISPLAY.
Immediately unplug the AC power cord (mains lead), and check if anything is blocking the ventilation openings of the unit.
After you have checked and found no problems, reconnect the AC power cord (mains lead), and turn on the system.

CAPACITOR ELECTRICAL DISCHARGE PROCESSING
When removing the MOTHER board and SMPS board after checking the operation of this unit, be sure to perform the discharge processing of C2076 on the MOTHER board and C6302 on the SMPS board before removing the boards.
When it is removed the boards without performing the discharge processing and it is shorted the both end of C2076 on the MOTHER board, it might be damaged the DAMP IC.
Perform the discharge processing with referring the figure below.
Note: Be sure to discharge using a resistor of 800 W or higher.

MODEL IDENTIFICATION
Distinguish by destination code on the rear side of the main unit.

DESTINATION ABBREVIATIONS
The following abbreviations for model destinations are used.
• Abbreviations
AEP : European area (Except for Ireland, UK), East European area, CIS area (Moldova) and Middle East area (Jordan) models
AUS : Australian and New Zealand models

LA: Latin American area (Except for Argentina, Brazil) model.

UK: UK and Ireland models

DESTINATION SETTING METHOD

NFC OPERATION CHECKING METHOD
When the MOTHER board is replaced, it is necessary to check that pairing is normally performed.
Perform the operation check according to the following procedure.

[Be sure to delete paring information after checking the pairing]

Necessary Equipment
• NFC-compatible Smartphone
Note 1: Smartphones with a built-in NFC function (OS: Android 2.3.3 or later, excluding Android 3.x).
Note 2: If the NFC-compatible Smartphone has an OS version that is older than Android 4.1.x, download and install the “NFC Easy Connect” application.

Connection Method
1. Turn on the NFC function of the Smartphone.
If the NFC-compatible Smartphone has an OS version that is older than Android 4.1.x, start the “NFC Easy Connect” application.
2. Press the [Power] button to turn the power on.
3. Touch the Smartphone to the N-Mark on this unit.

4. When the NFC connection is completed, connected Smartphone name is displayed on the vacuum fluorescent display.
5. Start the playback of an audio source on the Smartphone.
Note 3: For details, refer to the operating instructions of Smartphone..

Connection Releasing Method
Touch the Smartphone to the N-Mark on this unit again.

Deletion of Pairing Information
Perform the “COLD RESET”

CHECKING THE OPERATION AFTER REPAIR
After repair completion, connect the “iPhone/iPod”, “Walkman”,
“Smartphone” etc. corresponding to this unit, and check the operation of playback, recording, charge, etc.
NOTE OF REPLACING THE ELECTRICAL PARTS ON EACH BOARD FOR REPAIRING
Among mounted electrical parts on each board, only parts that are described in the electrical parts list can be replaced for repairing.
The parts that are not described in the electrical parts list cannot be replaced with single for repairing.
NOTE OF REPLACING THE MOTHER BOARD FOR REPAIRING
Among mounted parts on the MOTHER board, only parts that are described in the electrical parts list can be replaced for repairing.
When the parts that are not described in the electrical parts list are defective, replace the complete mounted board.
In this service manual, the block diagram and printed wiring board of the MOTHER board are described for reference.
Also, when the MOTHER board is replaced, be sure to refer to “DESTINATION SETTING METHOD” and “NFC OPERATION CHECKING METHOD”

NOTE OF REPLACING THE PARTY LED, SW LED NFC AND MS-476 BOARDS FOR REPAIRING
When the PARTY LED, SW LED, NFC and MS-476 boards are defective, replace the complete mounted board or the whole parts including the applicable board.
The mounted parts cannot be replaced with single for repairing..
Also, when the NFC board is replaced, be sure to refer to “NFC OPERATION CHECKING METHOD”

NOTE OF REPLACING THE SMPS BOARD FOR REPAIRING
When the SMPS board is defective, replace the complete mounted board.
The mounted parts cannot be replaced with single for repairing.
However, in this service manual, the block diagram, schematic diagram and printed wiring board of the SMPS board are described for reference.

TEST DISCS
Use following TEST DISC when this unit confirms the operation and checks it

• For CD
Part No. Description

• For DVD SL (Single Layer)
Part No. Description

• For DVD DL (Double Layer)
Part No. Description

RELEASING THE DISC TRAY LOCK
The disc tray lock function for the antitheft of sample disc in the shop is equipped.
It can release the lock function in the following procedure.

Press the [Power] button to turn the power on.
2. Press the [FUNCTION] button to select the “DVD/CD” function.
3. Press two buttons of the [MEGA BASS] and [VOCAL FADER] simultaneously for 3 seconds.
4. The message “UNLOCKED” is displayed on the vacuum fluorescent display and the disc tray is unlocked.
Note: When “LOCKED” is displayed on the vacuum fluorescent display, the disc tray lock is not released by turning the power on/off with the [Power] button.

HOW TO OPEN THE TRAY WHEN POWER SWITCH TURN OFF or no power
Note 1: Refer to “2. DISASSEMBLY” on page 9 or later, after the top panel block is removed, does this work.
Note 2: Please prepare the thin wire (clip etc. processed to the length of 8 cm or more).

Disassembly procedure