JBL EON 515 |
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bruce@bluff
Registered User Joined: 16 September 2007 Location: South Africa Status: Offline Points: 232 |
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Posted: 12 April 2016 at 6:22am |
Got a JBL EON515 module in for repairs. Unit does not come on. Any ideas ?
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Earplug
Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7199 |
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Earplugs Are For Wimps!
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bruce@bluff
Registered User Joined: 16 September 2007 Location: South Africa Status: Offline Points: 232 |
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Thanks, but by the time it gets shipped out here to SA it would almost be the same as buying a new speaker. Found a supplier in the UK for app 306 pounds and with an exchange of R22 to the GBP it too is ridiculous. Was hoping is something simple I could repair here. Anyone got a diagram?
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kedwardsleisure
Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4938 |
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is the primary dc bus up?
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Kevin
North Staffordshire |
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bruce@bluff
Registered User Joined: 16 September 2007 Location: South Africa Status: Offline Points: 232 |
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Not too sure which one is the primary dc bus I would assume you mean the rectified supply across C610 AND C611 will check it. I did check RT601 and it measures app 16ohm in circuit I also don't hear the relay click in upon power up and RT601 remains cool. Thanks.
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Earplug
Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7199 |
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I managed to get one going a while ago, but it wasn´t easy. Start with the usual suspects, ie the output FETS.
I´m also pretty sure a friend here managed to source replacement boards for around $130. I´ll check and let you know. |
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Earplugs Are For Wimps!
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simonp1100
Young Croc Joined: 01 September 2008 Location: Bristol Status: Offline Points: 1103 |
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PLEASE BE VERY CAREFUL AS VERY DANGEROUS VOLTAGES ARE AROUND THIS BOARD WHEN POWERED UP AND THIS SHOULD BE ONLY ATTEMPTED BY A COMPETENT ENGINEER.
I have repaired a few of these and below is a list of things to check from the JBL service manual:-- Start by doing a thorough visual examination of the assembly for any sign of damage. This will help guide you to the trouble area. 2. Using an ohm-meter measure from TP601 (+VCC) to TP602 (Ground). It should measure over 2K and rising as it charges up the capacitors. If this reads near 0 ohms then you will need to remove the PWA from the heatsink and check for a silpad short. 3. Using an ohm-meter measure from TP603 (-VCC) to TP602 (Ground). It should measure over 2K and rising as it charges up the capacitors. If this reads near 0 ohms then you will need to remove the PWA from the heatsink and check for a silpad short or a short between U402 and the heatsink. 4. Using an ohm-meter measure from TP601 (+VCC) to TP603 (-VCC). It should measure over 2K and rising as it charges up the capacitors. If this reads near 0 ohms, then check Q370, Q371, Q372 and Q373 for shorts, and replace the damaged parts. If two of these MOSFETs are shorted then replacing them is all you will need to do to the amplifier section but you will need to check the power supply for damage. 5. Connect a low voltage supply capable of +/-20Vdc to TP601 (+VCC), TP602(GROUND) and TP603(-VCC). Verify thatthe +15, -15, +5 and –5V regulators have the proper voltage output. If the voltage is low on any of these and there is not excessive current draw, then replace the regulator. 6. Connect a 40K ohm resistor from D611 cathode (+VCC SENSE) to +VCC, with the supplies set to +/-20Vdc. This will allow the amplifier to start switching. Verify the switching waveforms at Q370 Drain pin and Q372 Drain pin are square and stable. Primary circuits. 1. Using an ohm-meter check Q605 and Q606 for shorts. If these devices are shorted then check R626 and R628 which should read 10ohms. Next check Q601, Q602, Q603, Q604 for shorts and opens. If any of these are damaged then you will most likely need to replace the following parts along with the ones already identified. U603, R623, R624, U602, U609 and U 601. 2. After replacing all failed parts, connect a power supply set to 13Vdc from +15V control to SMPSREF and place a 1K ohm resistor from U602 pin 2 to +15 control. Verify that the signal at Q606 Gate is a square wave at approximately 140KHz. 3. Remove the 13V supply and resistor then connect a 300Vdc supply from VBULK to SMPSREF. Verify that the signal at Q606 collector is a 300V peak to peak square wave. The current draw should be less than 70ma. 4. Verify that +Vcc and –Vcc are ~ 21Vdc with 300V on Vbulk. 5. Remove the supply, check the AC fuse and verify proper operation when plugged into the AC line. Initial Field Failure Reports To date early field failures have been observed in the 3 categories listed below. Included in each category are typical warning signs indicative of each as well as corrective actions implemented. 1. Shorted devices due to metal shaving contamination. Single shorted output device with no other failures. Look for metal shavings in the silpad insulator. Vtech has added an additional cleaning stage to remove these from the heatsink. 2. Low IGBT gate drive at start up. Typically a catastrophic failure with extensive power supply gate drive damage (R625-628,Q601-606,U602-602,U608,U609) . The 15 ohm PTC at RT601 allows U608 to fully initialize before the supply is enabled. 3. 230V power up failures due to a sticking relay. The dominant failure modes observed have been a blown fuse and/or damaged U603. Check for a stuck relay by looking across the contacts of K600 while unpowered for a short between 1/2VBULK and DOUBLER. These can be accessed topside by probing T601 Pin 6 (highlighted in pink and R611 Pin 2 highlighted in white). In some cases a stuck relay can be “unstuck” by getting knocked about in shipping and will measure ok. It is also worth noting that the bulk caps C610 and C611 can be damaged due to overvoltage stress if powered on at 220-264V with a stuck relay. In this case the unit will power up successfully but will not work when driving a load. Replacing C610 and C611 will remedy this. The auto detect circuitry has been redesigned effective 1/14/09 to prevent a power down glitch which causes the stuck relay. Check there is 15 volts across C619 when powered up & this will tell if the VBOOT circuit is working (if not replace U608 which is a LNK304). Hope this helps...... |
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bruce@bluff
Registered User Joined: 16 September 2007 Location: South Africa Status: Offline Points: 232 |
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Thanks for the assistance. Simon will get on it this morning
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bruce@bluff
Registered User Joined: 16 September 2007 Location: South Africa Status: Offline Points: 232 |
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Hi Simon, TP601 to TP602 reads 150k and the same with TP603 to TP602
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simonp1100
Young Croc Joined: 01 September 2008 Location: Bristol Status: Offline Points: 1103 |
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Hi, It's more likely to be around the SMPS section.
Check the small relay contacts are not shorted out (take relay out) and then check there is 15 volts across C619 when powered up & this will tell if the VBOOT circuit is working (if not replace U608 which is a LNK304). The relay drive circuit is powered via this VBOOT circuit and this seems to be where the problem may be. Edited by simonp1100 - 14 April 2016 at 5:49am |
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bruce@bluff
Registered User Joined: 16 September 2007 Location: South Africa Status: Offline Points: 232 |
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Thanks all for your help found all the trannies around U602 blown so I would assume U602 is blown too. The board has already been worked on and it looks like those parts where changed. Told my mate it would be better to replace the whole board. Waiting a price from Thoman. Is it common for powered speakers to be so problematic, it's not only JBL but Wharfdale too, perhaps it's our bad power out here or they can't take the heat and humidity.
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rish
Young Croc Joined: 18 June 2008 Location: Durban Status: Offline Points: 547 |
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I used powered speakers for years and never had a problem with any of them from JBL , RCF etc..
99% of the time it is down to user error. I have seen peeps her in SA use 2 Jbl Eon's for 1000 people and drive the shit out of those speakers. Our power is fine and the weather conditions is adequate to operate equipment within safe operating temperatures. Power becomes a huge problem in buildings that have incorrect wiring configurations and therefore becomes a problem in a specific venue. I have seen in many venues that they have 8-12 plug points on one breaker. If a few points are being used then its fine, but when all are being used for sound, lighting ,catering ect it does pose huge problems and more a safety concern. Rish
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