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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All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Saturday 23 February 2019

AKAI - CTW-3257 HOW TO ENTER SERVICE MODE -

How to enter Service Mode - AKAI - CTW-3257


SERVICE MODE ENTRY
  • Switch On the receiver, by pressing main switch.
  • Press "Menu" "TV" and "i" buttons successively within 5 seconds, after main switch is ON.
  • NB:  If the receiver remains in standby condition, after selecting the service mode, switch ON  the receiver by pressing the TV button 'twice' and select the service mode by pressing "i" button.
  • To Exit from service mode, switch Off the receiver using the main ON/Off switch.
FAULT DIAGNOSIS
  • By pressing 'red' button in the service mode, the processor checks all possible addresses of bus-driven circuits and shows the settings on the screen.  This feature also can be used in fault finding.  If an option bit is not '1' when it should be of if it is not possible to change it to '1' by using number buttons , the IC is either not present or it is faulty.
Changing the Option Bytes.
  • In service mode, select configuration mode by pressing 'red' button.

Remote control Buttons in Service Mode.
  • When the receiver is in service mode, select the normal TV mode by pressing the TV button, and return to service mode by pressing the "i" button.  Number and cursor buttons are used for service adjustments.  The 'Yellow' button hides temporarely the service menu..  The OK button stores the settings.
LANGUAGE SELECTION
  • Press 'Menu" button [under the lid]
  • Select 'Setup', and press OK button.
  • Select Language and press OK button.
  • Select the desired language and press OK button.
  • Press TV button to Exit.
INITILIZATION 
  1. Set the receiver to service mode
  2. Press 'red' button to pre-confugurate the set.  Green LED will flash once.  At the same time, controller will check NVRAM and initializes it automatically if it was 'empty'.  When it is complete the green will light up.
  3. Switch OFF the receiver by pressing the mains switch
  1. SW VER:  microprocessor software version.
  2. NVM VER:  NVM software version.
  • Select IIC device byte 1-4 or option byte 1-5 with cursor button  Up/Dn.  The selected bytes will be high lighted.
  • Set the bits using number buttons [0-7].
  • Store the setting by pressing OK button.
  • Return to service mode, by pressing 'red' button again.
Posted By: FRANK at 05:19
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