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Hafler power amp has one side out. Would like local repair.Series 9300.Approx.10-15 years old.Not used much.Second time to blow.Runs 4, 8om speakers including 2 bose 802,s (no bose controller or eq in system) and 2 REF Kseries 8om speakers.Used as external amplifier to Yamaha home theater amp to drive mains in system.Thanks,Byron Pritchard,Denver colo.

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Just discovered same problem with my Hafler DH-200...right channel out but no obvious problems inside (no loose/burned wires, components, etc). Driven by Hafler pre-amp, but definitely power amp problem.

Posted on Dec 28, 2009

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MY kitchen Aide mixer was running alittle rough /loud and now has stop completely. It is approx 24 years old and has never had any problems. It is hard to find a local repair [place. any suggestions


Two things you can do for a 24-year old machine:

1. Replace both motor brushes (Black large plastic Caps on each side
of the Moto Housing). Without these, the motor wouldn't even run.
2. Replace the Worm Gear (the cause of the Rough Loud noises)

Download a copy of the Repair Part List from Kitchenaid.com for
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Also don't forget to tighten all the screws inside the mixers and use
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I got a Marshall MG100HDFX for free from a friend stating it was blown. I asked how this happened and he said that one of his friends plugged in another speaker or amp into the second speaker input in the...


The power amp section has blown parts. You will likely find they use a chip like the TDA7293 as the power amp output and it will be blown, shorted causing the fuse to blow. These cost $6 from Digikey.com. Find a competent tech to replace it and use heat sink compound. Verify the part before ordering one. They come with leads bent either way so make sure you get the one with a matching suffix letter. When firing up after repair, put a 60 watt light bulb in series with the hot power lead to act as a current limiter... saves blowing fuses if there is another problem.

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Hafler 9270 stereo amplifier produces no audio when powered up and connected to speakers. So far, I have only checked the fuses, but am lost as online articles show continuity on my multimeter, however the...


0 ohms is a dead short. That's bad unless you're measuring a single conductor end-to-end.

Register and download the SERVICE Manual for free at retrevo.com

http://www.retrevo.com/support/Hafler-9270-Amps-manual/id/23316bh035/t/2/

Did it ever work?

If not, EVERYTHING is on the table as a possible cause. This is a big dumb amp with nothing but a power switch. Perhaps your source is the issue. Or the stereo/mono switch.

If so, what preceded the failure? Did a control get touched? Smoke?

The Hafler could be protecting itself.

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as a root cause for intermittent shutdown.

==

NEVER USE MAXIMUM VOLUME FOR TROUBLESHOOTING.

Turn the SOURCE volume control to something medium.

The errant switch, control or condition may change and you will suddenly release the amp's full power and possibly destroying your speakers. If a signal isn't audible at 1/2 volume it's probably not there.

Carefully examine the front panel for clues like a misplaced Mute or Tape Monitor control or Multichannel Analog Input selected.

There is a good chance that a common control may have developed a high-resistance or 'dead' spot through idleness and is causing your symptom. Turn the POWER OFF and operate every control throughout its range a number of times, especially rarely-used ones like Tape Monitors and the Mute control.

Turn the volume to something reasonable and see if that helped.

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Hi,I am Udo from Germany. Please execuse my bad English because I have learn it at school 25 ago. My problem is: I have a Ultimate Sound T3 Series 4070 Car Audio Amplifier with 4 channel and I want play...


Run a wire from the negative side of one speaker to the positive side of the other speaker. Then plug the remaining two wires into the amp. The positive wire coming from the first speaker goes to the positive on the amp on the first channel. Then run the second wire coming from the negative side of the second speaker to the negative side of the second channel on the amp. There for giving you the max power of your amp to your speakers. Hope this was helpful!!!

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Dunno how old they are, but I just had an 11-year old pair of woofers re-edged because the foam surround and the adhesive had deteriorated. Upon close inspection the foam surround was noticeably pulled away from the cone in a few spots. Unfortunately, if there is an age-related issue with materials beneath the surface that you can't see, you'd have to pull the driver to check it out.

It wasn't until I turned my bass up loud that anything sounded wrong, which precipitated looking for the culprit (quickly found).

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3. Turn on your Hafler 4000. The avr will not go into protect mode becasue of the transients from the Hafler because it is still not powered on.
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Sounds like a short circuit or a defect inside the circuitry that is allowing more power to flow through, thus blowing the fuse. My advice would be to dispose of these speakers for safety reasons and invest in a good quality set.

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