Still Blowing fuses

My JBL Eon 515 keeps blowing the external fuse (the one near the power in put) I took it to an expencive repair guy who just changed the fuse and it worked he could not find the reason. After a few months another unit keeps blowing its fuses as soon as it is turned on. Does any one have a clue what might be wrong. I am using t5amp fuses which are ok in in the other three of my units.

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William Covington

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Posted on Mar 08, 2018

William Covington

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Joined: Aug 25, 2009

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There could be something wrong with moisture. I had a drink spilled down the back of mine and I had to clean the board cause it kept blowing fuses.

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Fred Yearian

5603 Answers
Posted on Jul 31, 2011

SOURCE: I have a pair of

Make sure you are driving this with a balanced input XLR or TRS type cable. The driving device should have the SAME type output...

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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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Power went out. believe fuse is blown.

If the fuse is blown, then there is a failure that requires servicing. Unless you are adept at electronics, take it to a repair shop. Here is your service manual:

http://elektrotanya.com/jbl_eon15g2_sm.pdf/download.html

Scroll down to "get manual" and click to download. IGNORE other download links.

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likely a failure in the power supply or in the final power amp stage. Keep putting fuses in to "cook" out more parts to increase the repair expense... DON'T !!! Take for repair as a fuse isn't going to fix the problem.

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Operator manual download fpr 515 harmony

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http://safemanuals.com/user-guide-instructions-owner-manual/LOGITECH/HARMONY-515-ADVANCED-UNIVERSAL-REMOTE-_M

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My JBL EON 515 lost its low and high sound. But prior to losing sound the DBX output sound of both speaker would very low. However, when dbX was by-passed sound was restored. But it resulted breakdown of...

The corrosion is probably due to humidity. The other issuses will requier it goes to the nearest JBL service center

Customer Service

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