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Old 14th June 2007, 06:13 AM   #1
betiuxss is offline betiuxss  United States
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Default hafle amp

Hi! I have a hafler amp 9505 transnova that wont give me any sound but powers up can someone tell me what may be wrong? and if there is a place to buy parts to repair it? and that if you guys think that I can repair it miself thanks in advance for your kind help
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Old 14th June 2007, 04:35 PM   #2
Minion is offline Minion  Canada
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Do you have a schematic?? Have you looked inside for Burned out components?? Do you have the test gear(scope ,Tone generator, ect) to troubleshoot the problem??? Have you checked the simple things like Fuses??

You are going to probably need some of these things to find out what the problem is and haveing some electronics Knowlege would also help......

There are several things that can happen in an amp that will over time cause it to Fail, and asking a question like "My amp doesn"t work" Why?? isn"t going to get you a lot of responces as the problem could be anything......

If the answer to these questions are mostly "No" then It might just be easier to Get someone with the knowhow to fix it for you....

Good luck
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Old 10th July 2007, 11:54 PM   #3
artnace@cox.net is offline artnace@cox.net  United States
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Default Hafler 9505

If your interested in getting this fixed, call Greg Wilkins at 480-600-5328. We used to work at Rockford whcih did the Hafler amps. Greg is set up to repair Hafler equipment.
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Old 17th July 2007, 07:33 AM   #4
betiuxss is offline betiuxss  United States
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Default Hafler

thanks for the reply guys I really don't have any tools to check my amp all i know is that powers up where can you buy parts for it? do you know about an electronics store that can sell you all the parts ? thanks
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Old 17th July 2007, 03:57 PM   #5
drummer_Dave is offline drummer_Dave  Canada
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there is lots of places to buy parts ( digikey.com , mouser.com etc...) but that really isn't going to help you if you don't know what is wrong. Not to be rude but it sound like you don't have much experience in troubleshooting circuits, this can be very dangerous when working on a power amp and not knowing what to be careful of. IMHO I would recommend maybe taking of the cover (WITH THE UNIT UNPLUGGED/POWERED OFF ) and see if there are an visible problems ex. burnt components, loose wire's, poorly soldered wires etc... There are lots of things that could be problematic, without a schematic or some base knowledge i would recommend leave it up to someone who has these tools.

All the best

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Old 17th July 2007, 04:39 PM   #6
Stormrider is offline Stormrider  United States
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Schematics are available from Hafler.com or atleast i know all the older amps are there, so i would assume the newer service books are there as well.

The rest of the people give good advice, either read everything you can find on safety, troubleshooting and amplifier design, and attempt fixing your amp or find someone who has the know-how to do the job.
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Old 18th July 2007, 04:14 AM   #7
Jan Dupont is offline Jan Dupont  Denmark
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Schematic here:
Free Schematic and Service Manual downloads www.audio-circuit.dk, Spare time company (just for fun): www.dupont-audio.com
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Old 18th July 2007, 04:59 AM   #8
Bigred is offline Bigred  Canada
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I'm with Dave on this one. I could be wrong but it sounds like you don't really have the skills/knowledge/abilities and equipment for that matter to troubleshoot down to the component level. My car won't start... where can I get parts? well like your amp, I can get parts just about anywhere but what parts? why won't the car start? many many many causes. This is a pretty nice amp and worth repairing so I wouldn't go messing with it. What you CAN do I believe is some BASIC troubleshooting. Unless you have already.... check if its even the amplifier. I've seen numerous times where complaint is "amp powers up but no sound" only to find that it was a source problem like a CD player or Pre-amp prob.... So go over basic things like cabling and connections. Is signal gettin to the amp? If after your 100% certain your gettin signal to the amp then let a professional examine it. My 20 cents worth
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