Free Shipping on All Orders 1-866-764-1801

Vist our Online Store
+ Reply to Thread
Results 1 to 3 of 3
  1. #1

    Member Sales Rating: (0)

    Join Date
    Sep 2005

    Default Adcom thermal protection light stays on

    I am trying to repair a set of amps that were hurt during lighting. One of them seems like it will be ok. The other, a GFA555II, powers up, but the thermal protection light stays on constantly, and no sound is coming from either channel. I have replaced all external fuses, there are no fuses inside to replace, like the older GFA555 (with no thermal protection circuit). Anybody know where this circuit is? There is a little blue wire with a plug on the end coming out of the toroidial transformer this where they plug in something to reset the circuit?

  2. #2

    Member Sales Rating: (6)

    Join Date
    Feb 2002
    Rockledge, Florida


    I that a stab at it Lighting damage / Short in bias transistors / per drivers / output drivers could be shorted causing a speaker output voltage to rail. Amp is doing the right thing and refusing to power up. Maybe fixable or not, seen TV's hit 1 was repairable 1 was NFT (Not feasible to repair) a complete frying. This set took the juice the other got the taste of it.

    Good Luck

    Carver Amazing Fronts
    CS400i Center
    RT800i's Rears
    Sub Paradigm Servo 15

    Conrad Johnson PV-5 pre-amp
    Parasound Halo A23
    Pioneer 84TXSi AVR
    Pioneer 79Avi DVD
    Sony CX400 CD changer
    Panasonic 42-PX60U Plasma
    WMC Win7 32bit HD DVR

  3. #3

    Member Sales Rating: (16)

    Join Date
    Mar 2005
    In A Van Down By The River


    The thermal protection light is on for a reason. There is no "reset" that I know of. Read many other stories similar and pretty sure the output trannys are cooked. It can certainly be repaired but I'd check on the cost and availabilty of original parts. The original Toshiba output trannys haven't been manufactured in about 5 or 6 years (or longer) although Adcom stated several years ago they bought up everything Tosh had and would be set for many years, FWIW. You maybe able to buy a used one for what it would cost to ship and repair.

    Also check:

    and do a search for Adcom in the solid state forum there are a few threads over there concering the same issue. Also some very helpful techs over there if you were to pose the same question.

    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass

    Pass Aleph 30; Eastern Electric Mini Max; Adcom GDA600; MIT S3/Z Pc; SDA 1C; Squeezebox; Tubes add soul!

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts