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!

©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, 28 February 2019

MARANTZ ST15S1 - SCHEMATIC (CIRCUIT DIAGRAM) - HOW TO ENTER SERVICE MODE

marantz ST15S1 - Schematic (Circuit Diagram) - How to enter Service Mode

ST15S1 marantz DAB-FM-AM TUNER - Circuit Daigram - Full
Used ICs: NM74LCX244 – AD1852 – ST232CDR – MB90350 – M24C64 – BU1924F – AK4103A – 74VHCU04 – 74HCT153 – NJM2068M
Factory mode – Service mode
To reset all settings to default status:
1. Press the Power On/Off button to turn On the power.
2. Press the Menu button and the Band select button at the same time; and pull the mains cord out from the wall AC socket.
3. Insert the Mains cord in again.
During the initialization, it is converted to DAB Auto Tuning state.
[if step 3 does not work, start over from step 1.
If the microprocessor has been initialized all the button settings are reset to the default values; the values set upon shipment from the factory.
Schematic (Circuit Daigram) - Click on the Schematics to Zoom In
Service Mode
Microprocessor version check
1. Connect the mains cord to the unit.
2. Press the Power On/Off button, while pressing the Menu and the Display button.
All segment of FLD will be light on.
Turn Gyro Tuning dial.  Version is displayed on FLD.
Turn off the power to quit Service Mode
Posted By: FRANK at 05:49
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