REPAIRING AND NOT THROWING AWAY

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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Thursday, 7 February 2019

PHILIPS MCM279 DVD MINI HI-FI SYSTEM – HOW TO DISASSEMBLE – CIRCUIT DIAGRAM

Philips MCM279 DVD Mini Hi-Fi system – How to disassemble – Circuit Diagram

AMPLIFIER
Output power ................................................ 30 W RMS
Signal-to-noise ratio ....................................... ≥ 65 dBA
Frequency response ............. 100 – 18kHz, ± 3 dB
Input sensitivity AUX ....................... 0.5 V (max. 1 V)
Impedance loudspeakers ..................................... 6Ohms
Impedance headphones .................... 32 Ohm -1000 Ohm

LIQUID LENS CLEANING
Before touching the lens it is advised to clean the surface of the lens by blowing clean air over it. This to avoid those little particles makes scratches on the lens.
Because the material of the lens is synthetic and coated with a special anti-reflectivity layer, cleaning must be done with a non-aggressive cleaning fluid. It is advised to use “Cleaning Solvent B4-No2”, available with code number 4822 389 10026.
The actuator is a very precise mechanical component and may not be damaged in order to guarantee its full function.  Clean the lens gently (don’t press too hard) with a soft and clean cotton bud moistened with the special lens cleaner.
Circuit diagram.
Main board: Used ICs - ET2314 – D9258 – SAA7824HL – KH29LV800CTTC-70G – SCF5250AG100 - ET8862Q – SAA658B – AT24C02 – HEF4094BT 
Power amplifier circuit
Used ICs: TDA8932BT – AZ34063AM
                                             
Disassemble procedure
A. Remove stand.  Release click and pull it out.
B. Remove Top Cabinet.  Remove screws MP 3x10 - 6 pcs.
C. Remove Amplifier board.
C1: Remove screws 2 pcs.
C2: Remove screws 2 pcs.

D. Remove Main board
D1: Remove screws MP 3x10 - 3 pcs.
D2:Remove screws MP 3x10 - 3 pcs.
Then remove lens frame cosmetic top-right&left.
E. Remove Key board
E1: Remove screws MP 2x8 - 8 pcs.
Then remove lens frame cosmetic bottom-right&left.
Exploded view - parts list
Click on the pictures to zoom in