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Hello I have a polaroid power supply that blows fuses here is the schematic The power correction fet Q1 is shorted and the zener. An ohm meter check finds no shorts in the immediate area. I am about to replace the fet and zener. Next?/ Now you owe me one. None of the caps are poofed. What should I check ?

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Things to check for: Inductors ? These are really just coils of wire, sometimes wound around a metallic or ferrite core. These can take on a number of appearances such as a donut shape, a small cylinder with axial leads, or numerous other packages. Typically, you will find markings on the printed circuit board such as L1, L2, etc. where these components are mounted. For some photos of inductors, please check out:, and click on Inductors. Inductors block higher frequency alternating currents while allowing DC to pass through unobstructed. Diodes ? These devices are usually long cylinders with leads sticking out of both ends axially. Usually, they are painted black and have a silver or white stripe on one end. Normally, there will be additional markings on the printed circuit board that identify these parts using symbols such as D1, D2, etc. Diodes allow current to pass in only one direction. You are most concerned about the diodes that will be used to rectify AC current into DC current. Transformer ? you will only be concerned with the power transformer that steps down the AC house current to a lower voltage. This component should look very much like the drawing on this page: It should have an iron core and coils of wire wrapped around the core. The coils will have some kind of insulator coating around them. check all the above properly keepupdated,thanks. please do rate this solution positively.

Posted on Jun 18, 2009


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Technics su-g75 drawing/schematic? when hit power button fuse in power supply blowout.

Fuses blow when there's an overload. This is most likely caused by a semiconductor device(s) shorted. In amps this is often cuased by speaker wires that have touched while on power. The main culprits are the devices on the heat sink. If they are transistors then connecting an Ohm Meter accros the terminals of the transistor(s) (amp switched off) will show as if you have touched the test probes together! More than one device might have blown!!

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Polaroid 860-AZ0-GF371H Power Supply Unit. After replaceing all bad caps and and shorted fets Q102,103 I still need to know the value of smd zener ZK2 in Parallel with 3 low value smd resistors. I think...

HZK Series

Silicon Epitaxial Planar Zener Diodes for

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open the following link and it help you it has all the detail about the mentioned diode

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1 Answer

+48 volt in power supply is not working. All other voltages are present

Download the schematic at:

Scroll down to the link to download that says "Get Manual"

This is for the 1604 unit which is just a truncated version of yours. When downloaded, find the phantom power supply on page 18.

There are too many components to guess which one so best just to troubleshoot.

I would even suspect the phantom switch since they have POOR design with no inrush current limiting when charging the input capacitor. Since the 48 is not individually fused, if the inpout cap C3 shorts, it probably will take out the switch or the diodes.

Another user had the Zener D9 fail which would cause the problem. Meter the voltage across C3 (probably about 60 volts) and D9 and C4 (47 volts). First check C4 as that cap is run TOO close to the rating of 50 volts... poor design... C5 would also be suspect... or Q1 and Q2.

Then it gets dicey as there are UNDOUBTEDLY many bypass caps in the mixer portion of the board.

Apr 02, 2011 | Mackie 2404-VLZ3 Mixer

1 Answer

Tv powersupply fuse is blow, replas new fuse but same problam.


There is some short circuit in the power retulator side of your TV. Never put a fuse and switch it ON, as it may damage more components in your system. A power voltage surge can damage the regulator side of your TV. There is a short [Direct short] occured inside it. Check the rectifier section first, with the help of a multimeter set to Ohms range. Measure the resistance accross the main filtler capacitor. if it seems to be very low, say less than 12 Ohms or so, resolder out the mains rectifier stalk, or diodes, whichever may used, and chck it for juction short. If shorted, replace it. Check out the switching regulator also. In most cases this regulator may get damaged due to power supply spikes. In some sets, there is a MOV [Metal oxide veristor], connected accross the main AC line, after the switching point. this component is used as a protection, and if there comes any overvoltage or voltage spikes, this veristor will get shorted, blowing off the fuse, and further damage is prevented. Check this also. This component will look like a disc capacitor, normally black or green in color. Check these, and further check most of the power regulator components, such as Zener diodes for short. Before switch on your TV. make sure you have tested all the componets in the power regulator side. OK.

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Hi My tv is hard to turn on sometimes, and when it turns on then after some seconds or sometimes minutes, it turs off and remain on standby. Other times it turns on and runs ok for hours!!. Any help is...

All you need to do is to open the back cover of the television to check for dry soldering and bulged capacitor, if found replace with appropriate parts.
You need to check the output voltages of the power supply to see which one goes off. It may be due to short circuits some where.

Good luck in solving the problem.....

Oct 04, 2010 | Televison & Video

1 Answer

Samick sga 120 amp keeps blowing fuses. replaced all rectifier diodes and tranformer seems to be working fine. any suggestions?

Fuse blowing is due to excessive current drain and the the first clue is the blown fuse itself. If the fuse blows with a flash a bang and splatters copper across the inside of the glass you have a hard blow caused by a dead short on the power supply, check for power switch flashing over internaly. Short circuit main filter capacitors. Shorted turns in power transformer primary winding. If fuse just separates check for short on output transistors C to E. Try isolating fault by disconnecting LT pos/neg supplies to output stage. Also check for partial shorts on speakers and speaker wires using an analog ohm meter on low ohms setting.

Mar 27, 2010 | Audio Players & Recorders

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I have an IBM 9417-HB7 monitor that quit working for me. I took it apart and saw that 3 capacitors were blown, (820yf, 25v). I thought this would fix it but, all I get is the power light to come on. Can...

I am seeing many of these 9417-Hx7 IBM with the 3 820uF caps bulging. Almost always the inverter driver FETs are shorted, and cause burn marks on the plastic cover. Sometimes the zener protection diode is also shorted. Ohm meter will show how many are shorted and need replaced.
Monitor Mike

Sep 03, 2009 | Computers & Internet

1 Answer

Flm323b power supply

Replace Q2 by 18N50, Q8 and Q9 by STP6NK60 and Z2 and Z4 by !n4739. I have the same problem and fix it.

May 22, 2009 | Polaroid FLM-323B Television

2 Answers


With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts, you need to check the wiring feeding whichever line is too low.

If the voltage is OK, the amp will likely need to be repaired. If that's the case, do you want to repair it yourself? This amp may not be easy to repair. If you are not interested in learning to do this type of work, you should pay to have it repaired. If you want to repair it yourself, I'll try to help you through it.

Nov 11, 2008 | Rockford Fosgate 800.2 Car Audio Amplifier

1 Answer

Always blows fuses

I would get a volt/ohm/continuity meter to test the connections. You have a short somewhere. You can take it Car Auto or Tweeter and they can check it for you. Some of these places charge a $35.00 diagnostic fee. If you have a schematic diagram, you can test where the short might be.

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