Hafler Iris preamp repair - diyAudio
Go Back   Home > Forums > Source & Line > Analog Line Level

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 25th June 2010, 11:06 PM   #1
jb9 is offline jb9  United States
diyAudio Member
 
Join Date: Jun 2010
Location: USA
Default Hafler Iris preamp repair

After many months (OK, years) of dithering about, I finally got my Hafler Iris Preamp repaired. I'm writing this for posterity, in case it may help others in the future.


SYMPTOM
Unit ran fine for decades. One day in the middle of a listening session the amp blatted a loud hum for a few seconds, then the Iris shut down.

The Iris AC power fuse was blown, and when replaced it blew again after about 3 seconds.


REPAIR
The regulated +16V line measured 0V (in the brief period before the fuse blew). -16V line was fine.

With power off, the +16V line measured a dead short.

Pulling and testing all the chips and electrolytic caps on the main board didn't help.

Narrowed it down to a shorted tantalum cap on the front panel display/push-button board (4.7uF 25V). Replaced it with the same value (I would have used a higher voltage unit if I had one), and the problem was fixed. Getting to this board requires substantial disassembly.

While I was at it, I replaced the main power supply caps with new units just as preventative maintenance.


NOTES
I never did find a schematic; please let me know if you've got one you're willing to share.

Also, don't forget to remove the batteries from the remote if it's going to sit for months (OK, years) like mine. Even alkalines leak, as I discovered to my displeasure.

----------------

I'm sitting here listening to it right now ('Gold, Silver and Dirt' by NGDB, a pristine thrift store steal), and oh this phono preamp is soooo much better than the Adcom GTP500-II I've been using in the interim (which otherwise is a very nice unit in itself).

I'm happy now.
  Reply With Quote
Old 26th June 2010, 01:07 AM   #2
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Tantalums are prone to catastrophic failure -- the TekScopes newsgroup on Yahoo is full of disasters.
  Reply With Quote
Old 27th June 2010, 12:58 AM   #3
evanc is offline evanc  United States
diyAudio Member
 
Join Date: Sep 2009
Location: New Jersey. About 1 hour from NYC and 1 min. from the beach
I have the same preamp. I have the schematic. PM me with your email addy and I'll send it to you (it is too large of a file to attach here).
  Reply With Quote
Old 28th June 2010, 10:19 PM   #4
diyAudio Member
 
georgehifi's Avatar
 
Join Date: Sep 2003
Location: Manly Australia (Jewel of the Pacific)
Send a message via MSN to georgehifi
The Hafler Iris has a similar but not as advanced version of my Lightspeed Attenuator, as a volume control, you may want to replace this with my setup as it should also sound much better for it.
Lightspeed Attenuator a new passive preamp

Cheers George
__________________
Avatar : Production Lightspeed Attenuator
www.lightspeedattenuator.com
  Reply With Quote
Old 1st February 2011, 05:48 PM   #5
diyAudio Member
 
Join Date: Feb 2011
My Hafler Iris preamp just died, or at least fell seriously ill. On power-up there may have been a slight audible zap sound coming from the case. The unit lights up and will pass a signal but what comes out is very attenuated, clipped, and distorted. Putting a signal into the CD jack produces this output regardless of which input is selected; this is the same for any of the non-phone input jacks. The volume and balance controls seem to work both locally and on the remote. A visual inspection of the PCB shows nothing amiss, there is no unusual smell, and gently tapping on each discrete component has no effect. Internal B+ voltage is a steady 16v. My only measuring equipment is a VOM. Any suggestions much appreciated.
Jim Gregory
Sausalito, CA
  Reply With Quote
Old 2nd February 2011, 06:44 PM   #6
diyAudio Member
 
Join Date: Feb 2011
Default Hafler Service Centers?

While I hope to be able to repair my Hafler Iris Preamp myself, as a backup I asked Hafler if they would service the unit. They answered by saying that any one of the following service centers can repair the Iris Preamp. Has anyone experience with any of them?
Landis Technical(NC): 704-575-2134 LandisTechService@hotmail.com
Davidsons(NY): 516-753-0197
Scan Audio(CA): 818-786-4240
Many thanks,
Jim
  Reply With Quote
Old 6th April 2014, 11:32 AM   #7
diyAudio Member
 
Join Date: Apr 2014
Quote:
Originally Posted by evanc View Post
I have the same preamp. I have the schematic. PM me with your email addy and I'll send it to you (it is too large of a file to attach here).
evanc I was wondering if you were still prepared to share your Hafler Iris schematics?
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Hafler DH101 preamp repair and mods? jarrettl Solid State 116 7th March 2014 06:51 PM
Hafler IRIS Preamp Schema or info ? promitheus Solid State 12 19th May 2013 09:46 PM
Hafler DH 101 repair help db5owat Solid State 2 31st August 2008 01:01 PM
Hafler Iris Tuner display Peshrev Parts 0 7th June 2006 03:42 PM
Hafler IRIS CD Schematics Coulomb Digital Source 3 10th February 2005 03:37 AM


New To Site? Need Help?

All times are GMT. The time now is 11:36 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright Đ1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2