Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Hifonics HFi1500D output board (genericclassd7)
Hifonics HFi1500D output board (genericclassd7)
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 9th February 2019, 02:37 AM   #1
Crazylogix is offline Crazylogix  United States
diyAudio Member
 
Join Date: Apr 2018
Location: The Ozarks, Missouri
Default Hifonics HFi1500D output board (genericclassd7)

Working on a Hifonics HFi1500D, amp that is going into protect. Power supply is fine (tested with rectifiers out). All output fets seem good (none are shorted, but i did not remove to test). Perry's guide suggests the two transistors on the output board Q6 and Q7 (see close up pic) to replace in this instance. I do not happen to have any MMBTA42 transistors, and I don't have any sil-pad to make a heat sink, so I was wanting to replace them with a TO-92 (or the slightly smaller size) transistor and then use some E6000 to secure them so they do not break off. This would fix the board and have better heat handling. Looking at the MMBTA42 specs I see a VCEO of 300V and that alarmed me some, this board appears to drive 2 sets of paired transistors to drive the fets gates, so i would think it would not need high voltage rating on this small transistor. Looking for advice on a standard NPN to use. This is the first time repairing this style Class D and just looking for some peace of mind before I try this. Thanks!
Attached Images
File Type: jpg hifonics_board.jpg (535.6 KB, 67 views)
File Type: jpg hifonics_board_zoom.jpg (879.7 KB, 66 views)
__________________
DMM - HP 1222A scope - Hakko FX888D - 50w Unger iron - Yihua 858D Hot Air - 65A power supply (modded dell server) - 1000w 4 ohm test load - test sub - My Youtube repair videos -> Crazylogix
  Reply With Quote
Old 9th February 2019, 02:44 AM   #2
Perry Babin is offline Perry Babin  United States
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
The MPSA42 would be the equivalent. If your are doing this for pay, I'd suggest using the original parts.
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.
  Reply With Quote
Old 9th February 2019, 03:21 AM   #3
Crazylogix is offline Crazylogix  United States
diyAudio Member
 
Join Date: Apr 2018
Location: The Ozarks, Missouri
I own the amp, but will probably sell it once fixed because I have no need for it. I buy lots of dead amps to learn on (its a hobby for me, my day job is programming PLCs and VFDs, 480 volt sutff). I was trying to figure out a solution to the heating problem these have without use the binder clip and sil-pad. Got some in the Mouser cart now.
__________________
DMM - HP 1222A scope - Hakko FX888D - 50w Unger iron - Yihua 858D Hot Air - 65A power supply (modded dell server) - 1000w 4 ohm test load - test sub - My Youtube repair videos -> Crazylogix
  Reply With Quote
Old 9th February 2019, 04:02 AM   #4
Perry Babin is offline Perry Babin  United States
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
The amp will survive without the heat spreader. You can use a different method to get rid of the heat. The spreader I showed was from what I had in the shop and since it worked. I didn't try anything else.
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.
  Reply With Quote
Old 16th February 2019, 08:35 AM   #5
Crazylogix is offline Crazylogix  United States
diyAudio Member
 
Join Date: Apr 2018
Location: The Ozarks, Missouri
Transistors replaced, amp works fine!
__________________
DMM - HP 1222A scope - Hakko FX888D - 50w Unger iron - Yihua 858D Hot Air - 65A power supply (modded dell server) - 1000w 4 ohm test load - test sub - My Youtube repair videos -> Crazylogix
  Reply With Quote

Reply


Hifonics HFi1500D output board (genericclassd7)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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
hifonics drive board legion2710 Car Audio 3 21st July 2018 03:06 PM
hifonics driver board prls Car Audio 7 5th January 2015 03:02 AM
HiFonics HFi1500D Tom7227 Car Audio 15 6th December 2013 03:16 PM
Hifonics 1206 driver board blazer40 Car Audio 2 20th July 2012 10:57 PM
Hifonics HFi1500D airforceixi Car Audio 4 31st August 2011 10:31 PM


New To Site? Need Help?

All times are GMT. The time now is 12:18 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki