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 7 February 2019

JBL GTO7001 CAR AUDIO - CIRCUIT DIAGRAM - TROUBLESHOOTING

JBL GTO7001 Car Audio - Circuit Diagram - Troubleshooting

1CHANNEL POWER AMPLIFIER – schematic – exploded view – troubleshooting - JBL GTO7001 Car Audio

Specs:
• 425W RMS x 1 channel @ 4 ohms and ≤1% THD + N*

• 700W RMS x 1 channel @ 2 ohms and ≤1% THD + N*
• THD + N: 0.02% (rated power @ 4 ohms)
• Signal-to-noise ratio: 80dBA  (reference 1W into 4 ohms)*
• Signal-to-noise ratio: 107dBA  (reference rated power into 4 ohms)
• Frequency response: 20Hz – 330Hz (–3dB)
• Max power: 700 watts
* CEA-2006A-compliant.
Power Input Connectors
• +12V: Connect to the positive terminal of the vehicle’s battery. 4 AWG wire is recommended.  Install an appropriate fuse holder and fuse (75A minimum) within 18 inches of the battery. Make sure the wire is not damaged or pinched during installation. Install protective grommets when routing wires through the firewall or other sheet metal.
• GND: Connect to the vehicle’s chassis.
Speaker Output Connectors
• Connect the subwoofer to terminals, observing proper polarity. Either + or – terminal may be used. Minimum total impedance is 2 ohms.
DBO (Dynamic Bass Optimization) Variable Subsonic High-Pass Filter With Variable Boost (Q)
• For woofers in tuned (vented) enclosures, set the Frequency control to a value 10Hz below the enclosure’s resonance (tuned) frequency.
• For woofers in sealed boxes, set the control to any value you prefer between 30Hz and 50Hz.
• Set the Boost control according to your  preference, being careful not to apply enough boost to damage your woofer(s).  A DBO High-Pass Filter Frequency control, variable between 10Hz and 100Hz. B DBO Boost control provides up to  12dB of boost slightly above the high pass filter’s frequency.
Setting Input Level
A Turn Input Level control counterclockwise to 6V (minimim).
B With a dynamic music track playing, turn the head unit’s volume control to the 3/4 position.
C Turn Input Level control clockwise until the bass output is proportionate to the output of the high-frequency speakers, according to your preference.
D Input level is now adjusted correctly.
EXPLODED VIEW & PARTS LIST
SCHEMATIC
Click on the pictures to Zoom In
Troubleshooting
Status LED on Amplifier not Lit - Head Unit (Source) Turned ON Verify:
A. Remote turn-on wire from source to amplifier has proper voltage
B. Power (B+) connections at amplifier, terminal blocks, and battery are secure
C. Ground (GND) connections at amplifier and vehicle chassis are secure
D. Battery B+ fuse (if used) is OK
E. Amplifier fuse is OK
F. B+ at battery and B+ at amplifier has proper voltage
Status LED’s Lit, No Output from Speakers in Normal Operating Condition Verify:
A. RCA cables from amplifier to source are securely connected
B. Volume adjustment on amplifier is correctly adjusted
C. Source is ON and playing
Engine Noise From Speaker(s)
Turn source OFF, Disconnect RCA cables at amplifier. If noise stops, check equipment & cables leading to amplifier. Verify:
A. RCA cables are of good quality with no breakage to internal shields
B. RCA cables from source to amplifier are not run alongside any power cables.
Amplifier Output Distorted Music Verify:
A. Source output music to amplifier is not distorted
B. Source output sensitivity is correctly adjusted.
Amplifier Shuts Down, Green LED’s are Lit - Amplifier is in Thermal Protection Mode Verify:
A. Amplifier is mounted with adequate air circulation around heat sinks or vents
B. Amplifier is not mounted under carpet or sealed enclosure
C. Speakers meet correct impedance for application (mono or stereo hookup).
Amplifier Does Not Turn ON, and Red LED is Lit Amplifier (and not Connected to a Shorted Speaker) Verify:
A. Speaker crossover (if used) is not defective.
Posted By: FRANK at 05:15
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