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 !

Wednesday 20 March 2019

JBL DA 3504 4/3/2 CHANNEL AUTOMOTIVE POWER AMP - CONTROLS - CONNECTIONS - SCHEMATIC DIAGRAM

JBL DA 3504 4/3/2 CHANNEL AUTOMOTIVE POWER AMP - CONTROLS - CONNECTIONS - SCHEMATIC DIAGRAM


CONTROLS & CONNECTIONS

  1. Preamp-Level Input Connector - Connects to line-level output from the source unit
  2. Speaker-Level Input Connector - Use this connector for speaker level input signals.  A wire harness is supplied use with this connector.
  3. Speaker Output Connector - Connect speaker wiring to these connectors.
  4. Fuse - 30 Amp attached type fuses.
  5. Power Connection for 12v+,GND and REM connections for power wires.
  6. Input-Level Control - Adjusts input sensitivity for pre amp level and speaker level inputs.
  7. Crossover Selector - Determines whether the crossover is a High-pass filter @120HZ(HP), a Low-pass filter,@80Hz(LP) or unfiltered (FLAT)
  8. Bass E.Q. - This switch activates a built-in Bass Boost circuit used to increase low-bass output on the selected speaker output group. Enables bass boost +6dB@50Hz
  9. ST, or Stereo mode for normal operation Motor Mono mode for bridge operation.
MOUNTING
The JBL Decade Series amplifiers can be mounted in virtually any location inside the vehicle.  However, make sure to keep the amplifier away from heater vents or ducts.
  • At the chosen site, use the amplifier as a mounting template and mark the locations of the four mounting holes.
  • Drill a small pilot hole at each marked location.
  • Mount the amplifier and securely tighten the mounting screws.
WIRING DIAGRAM         {Click on images to Magnify}
SCHEMATIC DIAGRAMS