20 Most Recent Adcom GFA-5400 2-Channel Amplifier Questions & Answers


This amp is not designed to be bridged and can not be used in the mode you wish. Sorry, but internal circuit changes would be necesary for the amp to work as a single channel.

Dan

Adcom GFA-5400... • Answered on Jun 12, 2019


Check output transistors

Adcom GFA-5400... • Answered on Jun 25, 2015


You need to move the jumpers, then change the Mains Fuse to half of what it was in the US. This is because it remains the same wattage as it was, but now has twice the line voltage applied. Enjoy! Thats a nice unit.

Adcom GFA-5400... • Answered on Aug 22, 2014


THE AMP HAS 4 FUSES INSIDE, 2 PER CHANNEL. YOU NEED TO CHECK THESE FUSES. BE CAREFULL, HIGH VOLTAGE- UNPLUG POWER CORD AND LET THE AMP STAY FOR COUPLE HOURS. REPLACE ONLY WITH PROPER VALUE FUSES 5AMP. IF BLOWN AGAIN, NO MORE ATTEMPT TO REPLACE - YOU NEED TO SEND IT TO REPAIR FACILITY LIKE THIS

Adcom GFA-5400... • Answered on Sep 15, 2011


Since you are able to view the output i'm assuming you are using an oscilloscope and only the positive or negative half of the sine wave is displayed. The output stage will be using a complimentry pair of output transistors, one amplifies the positve half cycle the other the negative. These are driven by a driver stage (phase splitter). One side is not amplifying. First measure the pos' and neg' LT supply rails. If ok check
ouput transistors with analog Ohm meter for base / emitter / collector continuity. If the amp uses an output IC and LT supplies are ok then use scope to view input signal, if input ok but output bad then IC is suspect. Since both channels are affected your problem is most likely a missing LT supply rail.

Adcom GFA-5400... • Answered on Mar 30, 2010


I would contact Adcom for a service place near you

Adcom GFA-5400... • Answered on Feb 23, 2010


Can I assume that you have input signals going to both channels and that you have SWITCHED the cables to make sure that both cables going to the power amp are actually sending signals to it?
That will rule out any cable / pre-amp problems.
After you have done that test, let me know.

Adcom GFA-5400... • Answered on Oct 28, 2009


Connect the two speakers in parallel. That will present a 4 Ohm load to the amp.

Dan

Adcom GFA-5400... • Answered on Sep 15, 2009


First of all, when bridging an anp, the impenence that it can handle usually goes UP not down. I don't believe that the GPA555 can be bridged without circuit modification.

Dan

Adcom GFA-5400... • Answered on Feb 11, 2009


Use the niles for more than one speaker hookup. As far as the sub hookup, use a powered sub with speaker inputs
then use the right or left speaker and tag a couple wires to the sub. Good Luck
BIGRED

Adcom GFA-5400... • Answered on Jan 13, 2009


https://www.diyaudio.com/forums/solid-state/236765-adcom-gfa-555-ii-blowing-main-line-fuse-ideas.html

Adcom Audio... • Answered on Apr 03, 2020


Hello Curtis, comment that teams accompany the Adcom, to know where the signal arrives at the entrances of the GFA6000, I ask you this, to make a map of your sound system and try to find the possible place of failure Try the left and right speakers, in the outputs that work, it can be the Surround, to check that they are working I await your comment Greetings Franco Dosil Hola Curtis, comenta que equipos acompa?an al Adcom, para saber de donde llega la se?al a las entradas del GFA6000, te pido esto, para hacer un mapa de tu sistema de sonido y tratar de encontrar el posible lugar de falla Prueba los parlantes izquierdo y derecho, en las salidas que funcionen, puede ser las de Surround, para comprobar que est?n funcionando Espero tu comentario Saludos Franco Dosil

Adcom Audio... • Answered on May 13, 2019


Your laser mechanism has lost its ability to focus on the surface of the disk and can no longer read the data. Needs to be replaced since repair not cost effective.

Adcom Audio... • Answered on Jul 05, 2017


Check and download from service manual.com the operation manual.

Adcom Audio... • Answered on Nov 01, 2016


If I can read you right you are saying that the device keeps blowing the fuse? Fuses blow when there is an overload. As it is an amplifier we are dealing with the cause is more than likely a shorted output transistor or more than one, or whatever does the main amplification for the device. These devices are located on the main power amp board attached to a heat sink. If the amp has fuses for each channel then you only need to replace the devices on that channel, with the fuses blowing on it. The cause of shorted devices is often bad speaker wires or them touching.

Adcom Audio... • Answered on Nov 22, 2015

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