Question about Visonik VB-10PKG Car Audio Amplifier

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Vbx12a blows fuses when you power it up!

I have vbx12a that will blow the fuse on the back of whenever you connect power to it. Help!!!!!!

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Make sure your gain is turned all the way down. Unplug the RCA cables before hand. What does the subwoofer do when the amp powers on?

Posted on Feb 08, 2009

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Amp keeps blowing fuses


Blowing fuses, was caused by many thing.
Short of rectifier,resistor,elco,tube heater,tube pin, and also trafo itself (primary or secondary winding). It must check step by step.
CAUTION :
THIS IS HIGH VOLTAGE AREA.
RISK OF ELECTRIC SHOCK THAT CAN KILL.
DON'T DO THIS IF YOU ARE NOT TECHNICIAN OR NOT FAMILIAR WITH VACUM TUBE CIRCUIT. THE CIRCUIT MAY STILL CONTAINS ELECTRIC SHOCK EVEN IF IF THE AMP IS NOT POWER PLUGGED.


The simple steps (see picture) are:
  1. Disconnect all connection from secondary of power trafo (PLV,PDCH,PACH and PHV).
    Power ON the amp. If fuse is not blowing,trafo is good.
  2. Power OFF the amp. Unplug the cord.
    Connect PLV1-PLV2-PLV3 (this are Bias voltage,+/-15VDC and Backlight PCB voltage) to power trafo.Power ON the amp. If fuse is not blowing,PLV circuit is good.If fuse blowing,there are parts is damage (dioda,elco,7815/7915,resistor) in this PLV circuit.
  3. If step 2 is good,go to next step.
    Power OFF the amp. Unplug the cord.
    With PLV circuit stay connected,connect PDCH 1-2 and PACH 1-2 to power trafo. Power ON the amp.
    If fuse is not blowing,PDCH and PACH circuit is good and all tubes heater/filaments are lights after a few seconds.
    If fuse blowing,there are parts is damage (dioda,elco,tube heater pins) in this PDCH/PACH circuit.
  4. If step 3 is good,go to next step.
    Power OFF the amp. Unplug the cord.
    With PLV,PDCH,PACH circuit stay connected,connect PHV 1-2 to power trafo.
    Power ON the amp. CAUTION: HIGH VOLTAGE AREA is ON.
    If fuse is not blowing,PHV circuit is good.
    If fuse blowing,there are parts is damage (dioda,elco,tube pins) in this PHV circuit.
.amp-keeps-blowing-fuses-01sk4vtrndbaaguwe2brflsj-5-0.jpg
Notes:
  • Steps had to be done sequentially from 1 to 4, not upside down.
  • If tube/heater pin is short,it can't be repair. The tube must be replacing.
  • PDCH circuit is voltage for V1-2-3-4 heater/filaments.
  • PACH circuit is voltage for V5-6-7 heater/filaments.
  • Always replace fuse with same type.

amp-keeps-blowing-fuses-01sk4vtrndbaaguwe2brflsj-5-1.jpg

Oct 02, 2015 | Peavey 6505 Plus 120W Guitar Amp Head

2 Answers

Fuse Blows


does the unit works at all?

Dec 11, 2007 | Lowrance Iway 500c GPS Receiver

1 Answer

I have 1999 Pontiac grand am, my fuel pump fuse blows out whenever the ignition switch is turned. Do anyone have any suggestions on the problem?


When you turn the key on, it sends power to a relay. On the back end of the relay would be the computer for the engine computer. Which controls the fuel pump. Basically telling the computer, I am requesting fuel. Since the fuse blows, the possibilities are a bad wire from the fuse to the relay. A bad relay. A bad wire from the relay to the computer. A bad computer. First pull relay in the panel,turn it on. If it doesn't blow the fuse, You have eliminated one wire. If it does, fix that wire. Then swap the relay with another in the panel, if it doesn't blow a fuse, replace the relay. If it does , then remove the two plugs from the computer(under the dash on the drivers side). If it still blows a fuse, fix the wire from the relay to the computer. If it doesn't blow the fuse. Replace the computer.

Nov 11, 2014 | Cars & Trucks

1 Answer

07 honda accord factory fog lights won't work. I've narrowed it down to a fuse. Whenever push the button for the fog lights "bam!", it blows a fuse. I've tried about 5 fuses now and no luck. I've traced...


Hi Josh,

It sounds like you've got a short in there somewhere, for sure.

Since you've traced back and found nothing - I'd try disconnecting the lamps from the wiring harness and see if it blow again. If it doesn't - then it is a bulb or lamp assembly issue. If it continues to blow the fuse - you're going to need to keep tracing back further.

May 06, 2014 | Cars & Trucks

1 Answer

Fuse blows when I connect to original power source


You have a bad ground check the ground on the radio the black wire.write back if you need further help.

May 09, 2010 | Panasonic CQ-C1101U CD Player

1 Answer

Canon Pixma IP2000 - mains fuse blows


Try removing the printhead before powering up, after that you need either a new power supply or main logic pcb.

Nov 25, 2009 | Office Equipment & Supplies

2 Answers

2000 Buick Century lighter fuse blows when TomTom plugged in.


this is the cigar lighter receptacle causing the problem, take my word on this.

Aug 17, 2009 | 2000 Buick Century

1 Answer

Weather King blows fuse in Criterion II furnace


You probably have a shorted wire between the heater and the a/c. There are two wires that conncet the control power to the outdoor a/c from the heater they should be on terminal c & y in the heater. disconect those two wires and try it again if the fuse doesnt blow you have a short in the wire between the a/c & heater

Jun 01, 2009 | Weather King 10AJA2501AH Air Conditioner

1 Answer

B;owing fuses, wont power up, just smokes


Hi,

Try checking the reverse protection diode. This diode would normally be connected right after the power connector and would be the biggest diode inside. One way to verify if this is defective and causing the fuse to blow is even with the power switch at the OFF position, the fuse will still blow.

If on the other hand, the reverse protection diode is good and fuse will not blow when power switch is at OFF, then the short/defective component is inside. There would only be two (2) major components that can cause the fuse to blow with the power switch to ON, the final transistor and/or the audio IC.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Jun 06, 2008 | Cobra 29 LTD CB Radio

2 Answers

RCA big screen tv


whenever fuse blows every time it is the indication of short circuit in tv. so please do not put fuse unless you know the cause of blowing fuse. these are the reasons of blowing fuse. 1 main filter cap.short. 2 rectifier diode short. 3 swithing transistor short 4 horizontal output transistor short 5 caps & diodes connected to flyback transformer short. 6 print short. 7 at last if every thing ok then flyback transformer defective. hope this will help. if you are not a tech person call skilled tech to fix it. good luck

Sep 24, 2007 | RCA P60828 TV

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