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

SONY HCD GRX8 – AGING MODE – POWER AMPLIFIER CIRCUIT DIAGRAM - COMPACT DISC DECK RECEIVER - STK4231 – STK4221

Sony HCD GRX8 – Aging Mode – Power Amplifier Circuit diagram - COMPACT DISC DECK RECEIVER - STK4231 – STK4221


Sony HCD-GRX8 - Sony HCDR800 - Sony HCDRX88 - Sony HCDRX99 is the tuner, deck, CD and amplifier section in MHC-GRX8-R800-RX88-RX99.
Aging Mode

This mode can be used for checking the operations of the CD player and tape deck.
 When problems occur;
Aging stops, and the stopped state is displayed on the fluorescent display tube.
 When no problems;
Aging continues.
Preparations
 Set the CD on the DISC1 tray.
 Insert a commercially available tape for recording (tapes which contents can be erased, etc.) in decks A and B.
Setting the aging mode
Press the Stop button, ENTER/NEXT button, and DISC SKIP/EX-CHANGE button together.
When the aging mode is set, the CD roulette mark blinks. To exit the mode, press the Power button and turn OFF the power.

Sequence
The aging mode is executed in the following sequence.
If the function is set to “CD” when the aging mode is set, aging is performed starting from the CD player. When set to “TAPE A” or “TAPE B”, aging is started from deck A.
If the function is set to others, aging will not be started until the function is switched to CD or TAPE.
Aging of CD player (12 minutes)
Aging of deck A and Aging of deck B together =>Maximum about 12 minutes.
Display of status
 The aging status is displayed on the fluorescent display tube.
 Normally, the CD player displays the remaining aging time. But if operations ended abnormally, it displays the cause.
 During the aging of the tape deck, the operations performed will be displayed. If operations ended abnormally, this will be displayed at the fluorescent display tube.
CD Player
 During normal operations:
Display of fluorescent display tube [**1-@@]
**: Displays “CD” and the remaining aging time (minutes) alternately. The remaining aging time is counted down from 12.
@@: Track number being accessed.
NO DISC ERR => DISC 1 is NO DISC from the beginning
FOCUS1 ERR => Focus is not imposed properly
FOCUS2 ERR => The focus deviated several times after the disc rotated normally
GFS ERR => GFS ERROR
FBIAS ERR => Error during focus bias adjustment
SENSOR ERR => DISC 1 was found to be NO DISC by the disc sensor
TABLE ERR => The table did not rotate normally
TRAY ERR => The tray containing the BD did not operate normally
Operations during aging
Operations are performed in the following sequence during aging.
CD player
1. The CD tray rotates and disc 1 is selected.
2. Chucking is performed.
3. TOC is read.
4. Track 1 played back for 2 seconds.
5. The last track is played back for 2 seconds.
6. 1 to 5 is repeated.
7. After 12 minutes of aging, aging is switched to the tape deck.
Tape Deck
1. The tape in deck A is rewound to the head.
2. The FWD side is played back for 2 minutes.
3. The tape is fast forwarded (FF) for 20 seconds. The following procedure is performed when the tape end is reached before the 20 seconds.
4. The REV side is played back for 2 minutes.
5. The tape is rewound to the head (REW).
6. The tape in deck B is rewound to the head.
7. The FWD side is played back for 2 minutes.
8. The tape is fast forwarded (FF) for 20 seconds. The following procedure is performed when the tape end is reached before the 20 seconds.
9. The REV side is played back for 2 minutes.
10. The tape is rewound to the head (REW).
11. Aging is switched to the CD player.
HOW TO OPEN THE DISC TRAY WHEN POWER SWITCH TURNS OFF
Remove the Case.
Turn the cam to the direction of arrow.
Pull-out the disc tray.
Note for Installation (ROTARY ENCODER)
Power Amplifier - Schematic
Click on the pictures to zoom in