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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..............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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Saturday 16 March 2019

SONY ICF CD 2000 HOW TO ENTER SERVICE MODE - - TEST MODE

SONY ICF CD 2000

HOW TO ENTER SERVICE MODE -  - TEST MODE


SERVICE MODE

  • Connect TP447 (CD TEST 2) to the TP444 (GND).
  • Turn ON the S423 (CD OPEN switch).
  • Insert external power supply.
  • Connect TP453 (RESET) to the TP444 (GND) to make open. (Reset).
SERVICE MODE OPERATION
  • Once the service mode is affected, the LCD displays 18 indications each of which is repeatedly displayed.
  • By pressing the >>| or |<< key, the optical pick-up is movable inwardly or outwardly. However, if this is activated, tracking servo and sled servo are turned OFF, so it can be turned ON by pressing the [BAND]key if required.
  • Without disk, focus searching is repeated continuously.
  • By pressing the [BAND key, tracking servo, sled servo and CLV-A (servo in PLAY) are turned ON. Then playing begins.  No muting is ON in the service mode.
RESETTING SERVICE MODE
  • Remove external power supply.
  • Disconnect TP447 (CD TEST 2) and TP444 (GND), and also TP453 (RESET) and TP444 (GND).
PCB Component side & test points

TEST MODE
Connect TP445 (CD TEST 1) to the TP444 (GND).


Insert external power supply.
  • The CD auto adjustment is not performed, but LCD test mode is displayed. Also, ESP is placed in OFF state and it does not turn ON.
  • The sled is operating while the >>| or |<< key is pressed.  At this time, the spindle and tracking servos turn OFF.
  • The focus search is performed until the focus becomes OK, if the CD >>| key is pressed. At this time, the spindle and tracking servos turn OFF. Also, when the focus becomes OK, the optical pick-up moves to almost center of 12 cm disc.
  • The spindle and tracking servos turn ON when the BAND key is pressed. Also, the mute turns OFF if the data is correct.
Resetting of Test Mode -1
Remove external power supply.

Disconnect TP445 (CD TEST 1) and TP444 (GND).
TEST MODE -2

Connect TP447 (CD TEST 2) to the TP444 (GND).
Insert external power supply.
  • The CD auto adjustment is performed. Also, the ESP can be turned ON or OFF.
  • The sled is operating while the >>| or |<< key is pressed. At this time, the spindle and tracking servos turn OFF.
  • The focus search is performed until the focus becomes OK, if the CD ►|| key is pressed. At this time, the spindle and tracking servos turn OFF. Also, when the focus becomes OK, the optical pick-up moves to almost center of 12 cm disc.
  • The spindle and tracking servos turn ON when the BAND key is pressed. Also, the mute turns OFF if the data is correct.
  • The pickup jumps by one track if ►►|  or |◄◄  key is pressed when the spindle and tracking servos turn ON, or it jumps continuously if the key is kept pressed. Also, if the PRESET key is pressed, the following operation is performed.
[PRESET 1]   1 track jump

[PRESET 2]   4 track jump
[PRESET 3]  16 track jump
[PRESET 4]  32 track jump
[PRESET 5]  256 track check

  • The pickup jumps to the second music and the test mode is released, if CD ►|| key is pressed when the spindle and tracking servos turn ON.
Posted By: FRANK at 07:00
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