Infinity Audio Players & Recorders - Recent Questions, Troubleshooting & Support


The PS210 is a dog and Harman Kardon should have recalled it. My board also fried. And, no, I did not "turn the amp at full tilt."

Infinity PS210... | Answered on May 11, 2019


What do you need? If it is related to the impedance mismatch at the low level input, I have information as to what capacitors and resistors should be changed. Net gain will be 9.8 dB.

Infinity... | Answered on Jul 04, 2018


Resistors in sound system tend to burn out with short circuits or bad speaker wires.
The best thing to do get it repaired is to contact the maker of the device and they well let you have the number of the authorised service centre for where you live.

Infinity BU-120... | Answered on Jan 25, 2018


If your talking about the thump thump sound thru the sub when in standby mode, here's a fix if your good with a small soldering iron. Remove the amp from the sub. Locate U301 on the limit curcuit. (the small circuit card standing up right) Replace U301 with a TL074IN (www.alliedelec.com part #248-0012) .35cents +S/H also remove R263 from the preamp board,add a new 1N4148 diode(#935-0242) .05 cents to the pre amp board. Connect the Anode of the new diode to the Anode of D101 and the Cathode of the new diode to the Cathode of D108. Replace amp and test. Thump thump should be gone.

Infinity TSS-450... | Answered on Jan 11, 2018


Fixya is unable to source Infinity replacement parts.

Infinity... | Answered on Nov 18, 2017


invest in a multi meter if you want to test or diy electronics and as to repair or replace that would be up to what is wrong

Infinity Entra... | Answered on Nov 03, 2017


Time for a new one.
Yours is shorted out internally, and could possibly start a fire inside itself.
God bless your efforts.

Infinity BU-120... | Answered on Oct 21, 2017


Subwoofers are basically a mono amp. If you have replaced most of the big caps on it then I would go for the main amp device, the bit that does most of the work.

Infinity... | Answered on Sep 02, 2017


Msullivan56 & son,

Yes indeed... We are on luck...

There are circuit board layout drawings...
on my Favorite FREE "manual" site ...
starting on page 20
(SHOWING POLARITY)...

Plz click here...

Infinity BU 120 Service Manual Amplifier subwoofer Bu 120 hts

Hope this helps...

My First "experience" of getting soot embedded in my SAFETY GLASSES... WAS PLACING OF A MODERATE SIZED
"POLAR" filter capacitor in a pretty large RECTIFIER PANEL...

I HAD FOLLOWED the Circuit Drawing ...
(arguably correctly)
as there was very little of it left)) when
POWER WAS RESTORED ... (sort of)

I came out of the EXPERIENCE WITH AN ENDURING
respect for SAFETY GLASSES... looking rather
like a Raccoon (I'm just saying).

Wear them...!!


Carnac the Magnificent

Infinity BU-120... | Answered on Jul 25, 2017


The soldering to the wires can go bad. Making the unit turn on and off. The vibrations of the subwoofer over time will cause them to work free. Then when in operation they will cause them to break contact again.

Infinity BU-1... | Answered on Jul 14, 2017

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