Hafler 945 series schematics - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 17th April 2012, 03:17 PM   #1
wanders is offline wanders  United States
diyAudio Member
 
Join Date: Mar 2011
Location: Chico, CA
Default Hafler 945 series schematics

Purchased this Hafler 945 series preamp recently. Determined it's locked in Mute mode which is only accessible through the remote control system; and I don't have the factory remote. Programmed my Harmony 300 with the Hafler codes, but that doesn't trigger the Mute circuit. Heard from someone with a Hafler Iris that he was able to remove the remote pcb which made the preamp controllable through the knobs, without remote control of course, which would be fine for me.

The user manual, which is a little more extensive than most, is easily available; but cannot locate a service manual or schematics anywhere. Inspecting the unit I notice that the two large power circuit electrolytics have leaked, but doubt those would cause the Mute situation. The pcb containing the remote control "eye" is fairly extensive and contains lots of stuff other than the remote receiver.

Anyway, best thing would be to get the schematics so I could see what it's all about; I just don't have the skill or experience to tackle this thing without documentation. Checked all the usual sources including fee-services, but no luck. If anyone has a service manual, or knows of a source, or would be willing to send copies of key pages, or has any other ideas, I would be eternally grateful.

Thanks,
Warren
  Reply With Quote
Old 19th April 2012, 10:27 PM   #2
djoffe is offline djoffe  United States
diyAudio Member
 
Join Date: Oct 2008
I have a pdf of the schematic. It's too large to upload. Send me a private message and I'll send it to you by email.
  Reply With Quote
Old 20th April 2012, 12:46 AM   #3
wanders is offline wanders  United States
diyAudio Member
 
Join Date: Mar 2011
Location: Chico, CA
Default Thanks

PM on the way.
  Reply With Quote
Old 7th December 2012, 05:22 PM   #4
diyAudio Member
 
east electronics's Avatar
 
Join Date: Jan 2006
Location: Athens GREECE
ok since here not much info around them here is a few tips

mine had a blown trafo actually called the guys in Hafler ( US) before i hung up a cool guy named Forrest dropped me a mail with a generic but workable schematic

Seen that for audio anything between 18+18 till 23+23 will do ( it will be regulated to 15+15 ) but you will also need another winding for 5 volts to light up the fluorescent display .

beyond that there is a 78L05 regulator that is powered from the +rail line of unregulated 24 volt and fails quiet often ( resulting no 5 volts no display and a few other things that don't work ) and also next to the IC that is the display driver there is a crappy capacitor of 1000/10 that might fail badly enough to take down the all 5V line ...

So ...schematic is now available

kind regards
sakis
__________________
SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
  Reply With Quote
Old 7th December 2012, 05:38 PM   #5
wanders is offline wanders  United States
diyAudio Member
 
Join Date: Mar 2011
Location: Chico, CA
Quote:
Originally Posted by sakis View Post
ok since here not much info around them here is a few tips

mine had a blown trafo actually called the guys in Hafler ( US) before i hung up a cool guy named Forrest dropped me a mail with a generic but workable schematic

Seen that for audio anything between 18+18 till 23+23 will do ( it will be regulated to 15+15 ) but you will also need another winding for 5 volts to light up the fluorescent display .

beyond that there is a 78L05 regulator that is powered from the +rail line of unregulated 24 volt and fails quiet often ( resulting no 5 volts no display and a few other things that don't work ) and also next to the IC that is the display driver there is a crappy capacitor of 1000/10 that might fail badly enough to take down the all 5V line ...

So ...schematic is now available

kind regards
sakis
Thanks, Sakis. Were you wanting the schematic?
  Reply With Quote
Old 7th December 2012, 05:44 PM   #6
diyAudio Member
 
east electronics's Avatar
 
Join Date: Jan 2006
Location: Athens GREECE
Not any more ..I am done
But thank you though !

On the other hand you may sent it to me to see if the one you have is better than mine
service@eastelectronics.gr

Nice diyaudio people !!!!
__________________
SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
  Reply With Quote
Old 18th February 2013, 09:55 PM   #7
diyAudio Member
 
Join Date: Jul 2011
I realize some of the posts on here are a little dated, but if any of you are still offering schematics for the Hafler JFET Series 945 pre-amp........I'm a taker. Just happen to have one here in need of service, but no luck on finding schematic. [ slybyrd@sprynet.com ]
  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 945 JFET Preamp john65b Swap Meet 0 10th July 2009 02:52 AM
Hafler 945 Preamp Issues john65b Solid State 0 21st March 2008 02:21 PM
Hafler DH220 Schematics Zero Cool Solid State 1 14th December 2007 03:32 AM
hafler DH-100 series 2 vs non series 2 dimitri_dimitri Solid State 1 7th May 2006 09:48 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 01:56 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2