REPAIRING AND NOT THROWING AWAY

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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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 !

Thursday, 14 March 2019

SONY HCD GPX5G – 4-CH D-AMP CIRCUIT DIAGRAM, HOW TO TAKE DISC OUT IN EMERGENCY

Sony HCD GPX5G – 4-ch D-Amp circuit diagram, how to take disc out in emergency

Sony HCD-GPX5G/GPX7G/GPX8G
Precaution when installing a new op unit/ precaution before unsoldering the static electricity prevention solder bridge
The laser diode in the optical pick-up block may suffer electrostatic break-down because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also use the procedure in the printed matter which is included in the repair parts.
The flexible board is easily damaged and should be handled with care.
When installing a new OP unit, be sure to connect the flexible printed circuit board first of all before removing the static electricity prevention solder bridge by unsoldering.
Remove the static electricity prevention solder bridge by unsoldering after the flexible printed circuit board has already been connected.
(Do not remove nor unsolder the solder bridge as long as the OP unit is kept standalone.)
The laser beam on this model is concentrated so as to be focused on the disc reflective surface by the objective lens in the optical pickup block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objective lens.

Releasing the disc tray lock
The disc tray lock function for the antitheft of an demonstration disc in the store is equipped.
1. Press 1 STANDBY] button to turn the power on.
2. Press the [CD/DISC SKIP] button to select CD function.
3. While pressing the [Stop] button, press the [ENTER] button for more 5 seconds).
4. The message “UNLOCKED” is displayed and the disc tray is unlocked.
Note: When “LOCKED” is displayed, the slot lock is not released by turning power on/off with the [ STANDBY] button.


How to open the tray when power switch turn off or there is no power [Emergency]

SONY HCD GPX5G – HCD GPX7G HCD GPX8G - HOW TO RELEASE THE DISC TRAY LOCKS – HOW TO TAKE DISC OUT AT EMERGENCY & Mechanism Disassemble procedure
CD Mechanism Type => CDM74I-DVBU201//M
Optical Pick-up Name => CMS-ST6RFS3
HCD-GPX5G is the amplifier, USB, CD player and tuner section in MHC-GPX5.
HCD-GPX7G is the amplifier, USB, CD player and tuner section in MHC-GPX7.
HCD-GPX8G is the amplifier, USB, CD player and tuner section in MHC-GPX8
HOW TO OPEN THE TRAY WHILE POWER SWITCH TURN OFF
PRECAUTION WHEN INSTALLING A NEW OP UNIT/PRECAUTION BEFORE UNSOLDERING THE STATIC ELECTRICITY PREVENTION SOLDER BRIDGE
  When installing a new OP unit, be sure to connect the flexible printed circuit board first of all before removing the static electricity prevention solder bridge by unsoldering.  Remove the static electricity prevention solder bridge by unsoldering after the flexible printed circuit board has already been connected.  (Do not remove nor unsolder the solder bridge as long as the OP unit is kept standalone.)
DISC LOADING MECHANISM
The laser diode in the optical pick-up block may suffer electrostatic break-down because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body.  During repair, pay attention to electrostatic break-down and also use the procedure in the printed matter which is included in the repair parts.  The flexible board is easily damaged and should be handled with care. 
The laser beam on this model is concentrated so as to be focused  on the disc reflective surface by the objective lens in the optical pickup block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objective lens.
TO RELEASE THE DISC TRAY LOCK
> Press [Power/ STANDBY] button to turn the power on.
> Press the [CD/DISC SKIP] button to select CD function.
> While pressing the [Stop] button, press the [ENTER] button for more 5 seconds).
> The message “UNLOCKED” is displayed and the disc tray is unlocked.
Note: When “LOCKED” is displayed, the slot lock is not released by turning power on/off with the [Power/ STANDBY] button.

4 channel D-Amp board – schematic
PWB -  Component and foil side
Posted By: FRANK at 09:49
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