Access Virus & Virus TI community since 2002 Virus TI Infekted

Go Back   The Unofficial Access Virus & Virus TI Forum - since 2002 > Discussion concerning Access products > Trouble with your Access Virus?

Trouble with your Access Virus? Here you can get help when you have trouble or just don't know what to do.

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 20.05.2014, 06:01 PM
carlocola carlocola is offline
Newborn
Newborn
 
Join Date: 08.05.2014
Posts: 1
Default Please help identifying transistors in Virus

Hello

It would be great if someone knows or someone could pop the bottom off of their Virus B (or C) and let me know the values of the transistors that are circled in red in the photos.

Just what is written on each transistor is all I need (including which transistor info is which as they are different e.g. details of one closest regulator then details of the one closest the 3 chips to the right) - there are 2 transistors in the area, each photo shows from different angles.

The picture is of a Virus C - it's a Virus B i'm working on but I think they are the same in this part of the circuit.

I was recapping a Virus that wouldn't boot - it then booted but is acting erratic - I found a short on the regulator and these 2 transistors were charred (hence why I can't read off them) around the LM2575 regulator.

Thank you.
Attached Images
File Type: jpg access b circuit 2.jpg (84.4 KB, 16 views)
File Type: jpg virus complete.jpg (69.4 KB, 13 views)
Reply With Quote
  #2  
Old 06.06.2014, 12:57 PM
HAMERMAN HAMERMAN is offline
New here
New here
 
Join Date: 21.08.2013
Posts: 3
Default

The one closest to the regulator is a BS250 (P-Channel MOSFET)

The one closest to the three chips on the right is a BS170 (N-Channel MOSFET)

I think they are part of an inverter circuit to generate the negative supply that the 79L08 regulator uses to create the -8V Analog supply.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT. The time now is 11:12 PM.
Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Skin Designed by: Talk vBulletin
Copyright ©2002-2022, Infekted.org