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Colenzo Grant Posted on Nov 06, 2013

Can you send me the overload protection diagram

You have advise me to check the overload protection section were i can find faulty component or m/fet transistor bad

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Sami Sawda

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  • Posted on Nov 14, 2013
Sami Sawda
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0helpful
1answer

08 Lincoln Navigator Driver Side Front Turn Signals Not Working. Correct Bulbs Replaced.

USA left hand drive? LEFT?
not told Lef front mirror blink lamp dead too,. I bet yes.
check fuses first, all. lots there are some cars 4 fuse just for sigs
scan the PCM to see BCM errors on Turnsig blinks.
hazard fail is a huge clue here, the service manual has the schematics, all (100s of them)
1: TRAILER HITCHES? HERE, WIRED IN BY GOONS? UGLY MESS.
2: PAST COLLISION DAMAGE NOT CURED FULLY.
THIS CAR HAS BCM PROTECTION PER THIS.

The SJB utilizes a FET protective circuit strategy f

That means any short in the wiring it just self shuts down until the short is cleared. this is how all cars new are going and many have.
the SJB smart battery junction box runs all this.
F6 fuse blows all of that goes dead so is not F6 blown
a huge number of FET (means a transistor buffer amp)
the run the all per below, (the schematic makes all this better but here. 5 pages of schematics just for blinks
Fet RFrong and mirror righ
fet 2 left front and LF mirror (bingo fet 2 is overloaded shorted wire or shorted bulb LF
fet 3 RR and + hitch
fet 4 LR + hitch

the fets are basically perfect electronic fuses.
they self shut off at overload. and recover when the short is removed
so remove both lamps front left and see if the other wakes up.

my guess is mirror lamp is shorted. or mirror a wreck



nav-undefined-undefined-0.jpg the service manual is $20 to view
https://eautorepair.net/Marketing/Default.asp
0helpful
1answer

Wiring diagram for turn signals 2007 Expedition XLT SSV Front left doesnt work... Appears to be no power on the wire for turn signal side of buld.. Park side of bulb is goog and it has a good ground

Wiring diagram isn't going to help you . The turn signals are controlled by a electronic control module . SJB - smart junction box . You need a factory or professional scanner to communicate with the SJB .
Principles of Operation
The smart junction box (SJB) monitors the multifunction switch position by sending multiple voltage reference signals to the multifunction switch. When the multifunction switch is in the LH or RH TURN positions, or the hazard lamp switch is pressed, that input signal is routed to ground.
When the SJB receives a request for a turn signal or hazard lamps, the SJB supplies voltage to the appropriate turn lamps.
The timed on/off cycle is determined by the SJB and is set to flash approximately 80 times per minute if both the front and rear turn lamps operate correctly. If an individual turn signal lamp is inoperative, the SJB flashes the remaining turn lamp approximately 160 times per minute.

Your best bet , take it to a qualified repair shop .

Field-Effect Transistor (FET) Protection
The SJB utilizes a FET protective circuit strategy for many of its outputs (for example, the headlamp output circuit). Output loads (current level) are monitored for excessive current (typically short circuits) and are shut down (turns off the voltage or ground provided by the module) when a fault is detected. A continuous DTC is stored at that time for the fault. The circuit will then reset after a customer demand of the function (switching the component on, 30-minute battery saver being energized). When an excessive circuit load occurs several times, the module shuts down the output until a repair procedure is carried out. At the same time, the continuous DTC that was stored on the first failure will not clear by a command to clear the continuous DTCs. The module will not allow this code to be cleared or the circuit restored to normal until a successful on-demand self-test proves that the fault has been repaired. After the on-demand self-test has successfully completed (no on-demand DTCs present), the continuous DTC will have been cleared and the circuit function will return.
The SJB FET protected output circuits for the turn lamp system are for the LH front turn lamp output and the RH front turn lamp output circuits. The rear turn lamps utilize the stoplamp circuitry and are also protected. For additional information regarding the rear lamps, refer to Stoplamps in this section.

Smart Junction Box (SJB) Diagnostic Trouble Code (DTC) Chart DTC Description Action B2A27 Right Front Turn Lamp Circuit Open Go To Pinpoint Test M . B2A28 Right Front Turn Lamp Circuit Short to Ground Go To Pinpoint Test M . B2A29 Left Front Turn Lamp Circuit Open Go To Pinpoint Test M . B2A2A Left Front Turn Lamp Circuit Short to Ground Go To Pinpoint Test M . B2071 Hazard Switch Signal Short to Ground Go To Pinpoint Test N . B2281 Right Turn Switch Short to Ground Go To Pinpoint Test L . B2282 Left Turn Switch Short to Ground Go To Pinpoint Test L . All other DTCs - REFER to Section 419-10 .
0helpful
1answer

Pls somebody here knows the exact value of the ff burned components resistor and diode of power suppy section of minami mtv-2122 FLTGN. Attached photo tnx...

Sorry I don't know but I just wanted to advise you to obtain a circuit diagram as resistors rarely burn themselves out and the fault is likely to be an overload caused by other components on that circuit.
0helpful
1answer

I have faulty pcb and found 2 small blown fets or transistors on the underside oi the board .pcb wa13u7 .would you know what these components parts nos are .pcb assignent are ic9 and ic10.

match the ratings on the components at radio shack and solder the new ones on... or send the board for rebuild at corecentric or fixyourboard
0helpful
1answer

Why does it turn on, then off right away?

There will be a circuit protection system activating. You switch it and an overload condition develops so it turns off to prevent damage getting worse. The overload could be cause by faulty or touching speaker wires. Removing these might stop it. Another cause is faulty or shorted transistor or other device in the power amp section.
0helpful
1answer

No power

Might be power supply board faulty, if you are tech guy open power supply board check fuse.. if its open check bridge rectified and FET. in primary section if any component short replace it...
0helpful
2answers

I have a sharp cd-sx62v player it displays me protect message as i switched on the power and no other buttons are working so i am not able to play cds, cassete, fm.please help me

Generally speaking, an amp protects itself from heat, shorts and overloads by refusing to turn on or stay on.


Overloads can be from excessive periods of high output and shorts would be wiring issues or a speaker blowing up.


You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.


If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.


If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced hands-on tech.

0helpful
1answer

My denon avr-1706 is going into protection mode immediately after turning on. whats the problem?

You either have an overloaded output or a shorted powersupply. If you have verified that your connections are not the cause then the problem is internal and will require service from a trained technician. Switching power supplies are notorious for going bad. Two of the main components are the FETs used for switching and the PWM generator.
0helpful
2answers

The protection lite comes on when amp is given powerand sometimes it does not come on but it is still not getting any sound its not my wires they all work for any other amp tell me is my amp fried

Disconnect all speaker connections and rca cables. Leave power, ground and remote wires intact. Try turning on again. If you still have a protection light your amp is faulty. Sounds like you are overloading the amp. Please check speakers impedance. .A thumbs up would be greatly appreciated if this answer is helpful to you
protection-lite-comes-when-amp-given-otfyjrky3pc2prtgltcdyqtn-3-0.jpeg
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