Marantz PM4001 Hi, My Amp keeps cutting out and 5amp fuse keeps blowing. I have a Euro plug on my system that has to be connected to a 3 Pin converter plug. Can you Help!.

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master zee

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57 Answers

The converter should not b e a problem. It's time to ask a technician or a HiFi shop, an internal short circuit is blowing the fuse. Don't insist.

Posted on Apr 27, 2014

5 Related Answers

Bad News!
If the fuse is in the mains (power line) you could have a bad rectifier or other problem in the power supply. Most amplifiers nowadays have switching power supplies and they are not as easy to troubleshoot as the older linear supplies. If an Output or driver transistor is shorted, the power supply fuse will dump just as fast, load or no load.
Mister Phil

Posted on Apr 09, 2008

Anonymous

232 Answers

SOURCE: AMP PROBLEM

check ur speakers they can cause the short with vol

Posted on Aug 15, 2008

Jerry Umali

979 Answers

SOURCE: the fuse keeps blowing in my marantz pm-57

Goo day sir, the T on the fuse has nothing to do on you marantz fuse blowing up, chances are you amplifier is shorted, check you IC amplifier/power transistor for shorts. Check also your speaker impedance. usually they are 8 ohms. You can use a technician's multitester device to check the impeadance. An imbalance or mismatch speaker can cause a fuse to blow and destroy your amplifier. hope this helps.

Posted on Jul 31, 2009

Stephen Potts

447 Answers

SOURCE: Hi I have two marantz amps witch cut in and out when run from

In stereo terms your system is "clipping" which means you are pulling more amps than the system can handle. If it happens only when you use the mixer, I'm thinking the mixer cant handle the power. Check the specs, It should show maximum amp input.

Posted on Jun 04, 2010

Anonymous

2098 Answers

SOURCE: hello i have a marantz pm-47

Hi mas_66,
Make sure that the fuse is the same rating with the old one.
If still symptom persist, I've suspected that your output IC is shorted.
You may hang this IC, then power up the unit.
Observe what will happen, if this cure the symptom then this is a clear indication that this IC is shorted and made the fuse blown while it is in the circuit board.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.

Posted on Mar 08, 2011

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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:

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.
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.
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.
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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