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Where can I find a circuit diagram for Motorola APN6003a Power supply?

Seems to have 2 positive rails but don't understand why. Unit seems to switch off and on under load

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I assume it is a Motorola Solutions product. Try calling them Get Support

Motorola Mobility Support

Posted on Apr 07, 2015

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2009 cummins isx cm871 fualt code mid 128 sid 372 fmi 1

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check this site


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My audiovox 13" monitor in my van shows only a 2-3" bar of gray static through the center of the screen. What is the problem? I can't seem to get my video channel or the menu even with the remote co

Visually check elec.capasitors, then measure output voltages of power supply. First of all, try to find service manual with schematic diagram in Internet. Vertical or horizontal scan seems to be fault.

Dec 28, 2014 | Audiovox AVT-1475 13" TV

1 Answer

No Video when the system is turned on

Doesn't quite work that way, and good job on capacitor replacement


What bites is sometimes the Electrolytic Paste dries up, and there is no visual signs of failure.

1) Think I better tell you about the motherboard voltage regulator circuit;

One of the things the motherboard voltage regulator circuit does, is to regulate voltage for the Processor. (CPU)

The Processor MUST have a steady, 'clean', supply of voltage; and it MUST be kept within the tight voltage tolerance range, specified for the Processor.

Cannot be too much, or too little; or BIOS turns it off.

General thinking would be that the Capacitors that surround the Processor, are the only ones for it.
This is a fallacy.

There could a capacitor, or capacitors; that are in the motherboard voltage regulator circuit, and for the Processor; and are NO where near the Processor.

You actually have to follow the circuit traces, and see.
Example; Is there a capacitor over by the Ram Memory, or another outlying area, that a circuit trace from it leads to the processor socket?

Read the Hardwaresecrets article, and I believe it will help with understanding.

2) Don't know your soldering prowess, not knocking it.
You don't have any cold solder joints, do you?
That will make you pull your hair out, until you find it.

3) The Power Supply thing; the statement that it doesn't work that way;

You could have a Power Supply with a weak voltage power rail.
LED's would light up, and fans may spin; but there isn't enough power to turn the Processor on.

1) If ALL of the LED's were lit up at once, they would use less than 1 Watt of power.

2) EACH fan uses 2 to 3 Watts of power.

3) A typical Processor (CPU) can use 51 to 125 Watts of power.
Just depends on what Processor it is.

When testing; the Processor, processor fan and heatsink, plus ram memory is installed.

You are trying to get the BIOS Setup screen to come up.

Make SURE there is a stick of ram memory in Slot 1. (DIMM 1)
This is the ram memory slot that is closest to the Processor.
The Processor reads Slot 1 first.

Yes. If you have more than 1 ram memory module ('Stick'), trade them around/out, and see if you have a bad ram memory module.

Also suggest clean the gold plated contact pins, on the Ram Memory module; with a pencil eraser.
Use air to remove the eraser dust.

When diagnosing a desktop computer problem, POWER is ALWAYS checked first.
Then see if computer is dirty inside, and then clean ram memory module's, gold plated contact pins with pencil eraser.

If you are not following, or if the person before you was not following; Anti-Static Procedures, use the motherboards for a Frisbee, or expensive paperweight.

There are 3 main voltage power rails;
A) 3.3 Volts
B) 5 Volts
C) 12 Volts
ALL are DC Voltage

In comparison two D cell flashlight batteries produce 3 Volts DC.

A) ALL Orange wires are 3.3 Volts
B) ALL Red wires are 5 Volts
C) ALL Yellow wires are 12 Volts.

ALL Black wires are Ground wires.

Voltage power rail.
ALL Orange wires are 3.3 Volts, and they all end in one central point; inside the power supply; the 3.3 Volt power rail.

Same thing for Red 5 Volt wires, and Yellow 12 Volt wires.

Multimeter red probe lead (Positive) plugged into Red hole on multimeter, that has DCV next to it. DC Voltage.

Function knob set to DC Voltage (DCV)
If just a symbol, the symbol is a dotted line over a solid line.
(Curved line over solid line is ACV. AC Voltage)

If more than one scale, set to 0-50 volt scale, DCV.
0 to 50 volts Direct Current Voltage. (DC Voltage)

Positive (Red) probe lead of multimeter TO power wires.
3.3 Volt (Orange), 5 Volt (Red), 12 Volt (Yellow)

Negative (Black) probe lead of multimeter TO Ground wire.
ALL Black wires are Ground wires.
Read multimeter.
(Power supply on)

You can purchase an economical multimeter, for as little as $5 to $12.
Auto parts stores have them. (A little more pricey usually)
I have seen them on checkout aisle racks, at major discount stores.

Not feasible?
Is there a working computer you can TEMPORARILY, borrow it's Power Supply?
KNOWN to be working, and Compatible Power Supply?
Use for a test unit. See if the Power Supply is the problem.

Not to be a hater, but I would use SuperMicro motherboards; to skip across the lake with.

"Wow! Look at that baby go!"

But DON'T! It's bad on the environment.
(Fish get two heads, and stuff.

NO! Not really. You gonna' believe that? lol!

It IS bad for the environment, however)

For additional questions please post in a Comment.


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Crown XLS 602 power amp: Where inside is the fuse so I can replace it?

Hi Tom,

The fuse you may be referring from the power supply is not

used(none) instead a CB1 or circuit breaker is installed.

These breaker is in series with the power transformer ( trace it).

Disconnect the AC outputs of the power transformer when trying to

reset.( of course with the unit unplugged ).

Measure the output AC voltages, if it is OK

Be happy partially!

Next would be.....

Check for possible shorts on the Positive and Negative Supply

rails to ground or speaker out, for what might have caused the

breaker to tripped.

And these wont be easy troubleshooting , Good luck!!

thanks for choosing Fixya for assistance.

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Power window circuit on '93 Bravada

check for battery voltages then if it is 12 v above pull out the the power window motor and test directly to the battery f the motor is working f it is working check for power supply maybe fuse blown or the main switch is malfunctioning!

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Sony FD Trinitron WEGA..won't turn back on TWO Blinks---B+ over current protection (OCP) , unit goes to the standby mode then displays the 2 blink fault. Could be a short in the power supply of an

Visit this site for details. All information about this type of fault [2 blinks of standby light to sony Trinitron]; are described here in detail.
"Electro-help", is the name of the site.
Search for it on Google.

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Behringer DDm4000 purchased in 2009. Over 2 years happy usage, but now it's got some major issues! The power supply seems corrupted as after about 2 hours use it maxes out the signal (ouch) and all...

Behringer is stingy about schematics... however here is one for their DJX700 which MAY have a similar power supply to yours:

Scroll down to "get manual" and click to download... IGNORE other download links.
On page 9 near the lower right corner is the simple power supply, minus the transformer but showing the rectifier diodes, filter caps, and the three terminal regulators. These regulators have a thermal shutdown feature so if they seem to run VERY hot they might cause your problem. Common things are failing electrolytic filter caps. Behringer also uses switching power supplies in some gear and I have schematics of examples of those as well... but peak in your unit and see what type supply you have.

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Can you please send me the circuit diagram of LG 17 Inch monitor? I will be very great full to you.. Yesterday my monitor's power supply fuse and related 8 pin IC burned and i do'nt know the...

Seems like FixYa don't like me posting images in the solution box.
I'll send you a link instead. The image is quite small, but as I don't have the shecmatics myself, I had to look it up...I guess you can download it as a .pdf file though.

There you go!

Hope it helps. Good luck!

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Will not come on

RCA DRC8320N DVD Recorder/VCR


Seems to have no power, no lights on front lit, if listened to closely one may hear a "click click click" sound.

Solution: Replace C232 on power supply board.

Additional technical info:

In this design, the switching power supply feedback is from the 5 volt standby rail only, which is odd. The problem is caused when C232, the first filter capacitor in this rail and the sampling point for the feedback circuit, opens. The clicking sound is transformer rattle as the power supply restarts repeatedly.

Aug 03, 2009 | Televison & Video

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