Question about Pioneer GM-5000T Car Audio Amplifier

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Always blows fuses

Constantly the amp has been blowing fuses within a second of putting a new one in, i had gone threw 3 fuses within about a minute, as soon as i put in the fuse it blows, i have checked that the amp is grounded correctly and that the power lead hasnt been damaged anywhere, so theres is nothing i cant that will be causing it to short out. which has lead me to think that there is something wrong internally in the amp

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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.

Posted on Apr 09, 2008

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Posted on Jan 02, 2017

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2 Answers

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

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Terrano vg30e electrical issue...


first thing to do is to have the alternator checked out as the fuse blowing may indicate an internal short and therefore the battery is not being charged ( 3 starts and needs a jump)

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Fuses only blow when there is an overload. These are often caused by a semiconductor that is short-circuited. If it's a transistor that's gone a Ohm Meter will show it up quick. It will be like you have touched the test probes together when you put them across the device terminals. Also keep a look out for any part that's physically damaged.

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Stop lights are genrally routed through rhe tur signal control, which is the most likely place to have a problem. If the signal control feels unusual. there's that maybe provided you've gone the gambit of checking bulbs, pedal switch, etc. get an automatic fuse from the psrts store and put it in the bad fuse spot. It will go on and off like a flasher untul you locate the short. Get one that is lower than the one that blows to get it flashing faster. Do your turn signals and 4 ways workand see whar the do when you appliy the brake whilr on. Good luck

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1 Answer

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