Hifonics Zeus VII - diyAudio
Go Back   Home > Forums > General Interest > Car Audio
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 20th December 2006, 06:55 AM   #1
redimp is offline redimp  Romania
diyAudio Member
Join Date: Aug 2005
Default Hifonics Zeus VII


I have one Hifonics Zeus amplifier which has a defect.
Somebody else tried to repair it before me.
After this I found the following:
• transistors from the power supply have been changed with IRFZ 44 N (I don’t know if this is the exact required one)
• gate resistor (from the above transistor) I found as 220ohms and I replace it with a 82ohms (I don’t know if this is the exact required one)
• the driver transistor for the power supply transistor have been replaced with a BC 639 (I don’t know if this is the exact required one); in parallel with this emitter resistor (of this transistor) which has the value of 56ohms has been added a 75ohms resistor
• one of the rectifier diode was replaced with two diodes of lower current in parallel in case TO220 (the original one was in case TO 243)
• I have found one of the audio output stage transistor (TIP35C) defect; I have replaced all the five transistors which were connected in parallel

The amplifier has the following symptoms:
• without audio signal the idle current it is about 0,85A, and every thing looks OK
• with audio signal and a absorbed current of around 40A, the transformer from the power supply gets very warm (abnormal)


1. Is it possible that the reason of this defect has something to do with the “vario power circuit”? (I am thinking this way because of the fact that even for that 40A current; the voltage from collector of the audio output stage transistor is only 19V).
2. Which are the switching conditions of the vario power? Is it the input audio level a reference for the switching criteria
3. Which are the threshold values for switching of the three voltages (19V, 36V, 56V)?

Thank for your attention.
Looking forward for your answer.
  Reply With Quote
Old 20th December 2006, 10:47 PM   #2
diyAudio Member
Join Date: Dec 2005
Location: Northern California
Try reading this thread I think it will help you a bunch

Please pay attention to poster #4

Hifonics Service manual / schematic
  Reply With Quote


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
hifonics zeus vii mike49504 Car Audio 6 30th April 2012 05:31 PM
hifonics zeus xi mike49504 Car Audio 68 12th February 2009 05:23 PM
hifonics zeus VII stuck on pause amc32 Car Audio 1 10th April 2008 07:41 AM
Hifonics Zeus Series VII Busted resistors drumheadz Car Audio 1 6th June 2007 04:00 AM
Need help identifying an early hifonics Zeus jeclute Car Audio 4 5th June 2007 07:05 PM

New To Site? Need Help?

All times are GMT. The time now is 12:56 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2