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 !

Friday 8 March 2019

JBL GTO SERIES 301.1 CAR AMPLIFIER TROUBLESHOOTING AND CIRCUIT DIAGRAM

JBL GTO Series 301.1 CAR AMPLIFIER TROUBLESHOOTING AND CIRCUIT DIAGRAM


JBL GTO SERIES 301.1 

CAR AMPLIFIER 

TROUBLESHOOTING AND CIRCUIT DIAGRAM 


CONNECTIONS
The GTO subwoofer amplifiers are single-channel amplifiers. There are two sets of terminals to make it easy to connect multiple woofers. Either set of (+/–) terminals may be used when connecting woofers. To the right are two application diagrams to help plan your subwoofer system installation. Figure show how to configure the GTO subwoofer amplifiers
NOTE: Minimum speaker load is 2 ohms.

SETTING THE CROSSOVER(S)
Determine your system plans and set the crossover mode switch accordingly. Initially set the crossover frequency control midway. While listening to music, adjust the crossover for the least perceived distortion from the speakers, allowing them to reproduce as much bass as possible. Systems using a separate subwoofer set the crossover mode to HP (high pass) for your full-range speakers. Adjust the crossover frequency to limit bass and provide increased system volume with less distortion. For subwoofers, choose the highest frequency that removes vocal information from the sound of the subwoofer.
SETTING INPUT SENSITIVITY
1. Initially turn the INPUT LEVEL control(s) to minimum (counter clockwise).
2. Reconnect the (–) negative lead to the vehicle’s battery. Apply power to the audio system and play a dynamic music track.
3. On the source unit, increase the volume control to 3/4 volume. Slowly increase the INPUT LEVEL control(s) toward three o’clock until you hear slight distortion in the music. Then reduce the INPUT LEVEL slightly until distortion is no longer heard.
NOTE: After the source unit is on, red LEDs (on the top panel) will light, indicating the amplifier is on. If not, check the wiring, especially the remote connection from the source unit.
TROUBLESHOOTING
No audio (POWER LED is off)
No voltage at BATT+ or REM terminals, or bad or no ground connection.
Check voltages at amplifier terminals with VOM
No audio (PROTECT LED flashes every 4 seconds)
DC voltage on amplifier output
Check the amplifier output transistor and drivers
No audio (PROTECT LED is on)
Amplifier is overheated
Make sure amplifier cooling is not blocked at mounting location; verify speaker system impedance is within specified limits
No audio (PROTECT and POWER LEDs flash)
Voltage less than 9V on BATT+ connection
Check vehicle charging system for defective voltage regulator
No audio (PROTECT LED is on)
Voltage more than 16V or less than 8.5V on BATT+ connection regulator
Check vehicle charging system for defective voltage
Distorted audio
Input sensitivity is not set properly, or amplifier or source unit is defective
Check INPUT LEVEL setting; or check speaker wires for shorts or grounds
Distorted audio and PROTECT LED flashes
Short circuit in speaker or wire
Remove speaker leads one at a time to locate shorted speaker or wire, then repair
HIGH FREQUENCY INVERTER POWER SUPPLY CIRCUIT
USING - USING - NMJ13600 - NMJ2068 TIP35C - TIP36C 
PRE AMP AND POWER AMP CIRCUIT 
USING - NMJ13600 - NMJ2068 TIP35C - TIP36C 
CLICK ON THE IMAGES TO ZOOM IN
Posted By: FRANK at 03:50
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