UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Test Gear and Workshop Equipment

Notices

Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders.

Closed Thread
 
Thread Tools
Old 8th Sep 2013, 4:53 pm   #1
Gordonc
Pentode
 
Join Date: Sep 2011
Location: Consett, County Durham, UK.
Posts: 117
Default AVO 8 Mk III Problem

Hi guys,

I recently picked the above meter at a local boot sale. Not surprisingly it did not work but I soon found that one of the 15M resistors had become detached. Having resoldered this back on again the meter now zeroes on all but the ohms times 100 setting, which when switched to this setting seems to simply switch off. Any ideas as to how I can fix this?

Cheers,

Gordon.
__________________
Gordonc
Gordonc is offline  
Old 8th Sep 2013, 4:59 pm   #2
paulsherwin
Moderator
 
paulsherwin's Avatar
 
Join Date: Jun 2003
Location: Oxford, UK
Posts: 27,786
Default Re: AVO 8 Mk III Problem

Have you checked the 15V battery?
paulsherwin is online now  
Old 8th Sep 2013, 6:25 pm   #3
Ed_Dinning
Dekatron
 
Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 8,171
Default Re: AVO 8 Mk III Problem

Hi Gordon, I probably have the manual for this one if you need it, as Paul said, check the 15v battery

Ed
Ed_Dinning is offline  
Old 8th Sep 2013, 6:43 pm   #4
Gordonc
Pentode
 
Join Date: Sep 2011
Location: Consett, County Durham, UK.
Posts: 117
Default Re: AVO 8 Mk III Problem

Hi, Ed,
I did not have a battery, so I taped together 5 new 3v button cells and put these in with a couple of nuts as spacers, which seemed to work. Could this be the problem?

Gordon.
__________________
Gordonc
Gordonc is offline  
Old 8th Sep 2013, 8:28 pm   #5
Ed_Dinning
Dekatron
 
Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 8,171
Default Re: AVO 8 Mk III Problem

Hi Gordon, sounds like you've solved it and should have a permanent solution as the current draw is tiny.

Ed
Ed_Dinning is offline  
Old 8th Sep 2013, 9:24 pm   #6
Gordonc
Pentode
 
Join Date: Sep 2011
Location: Consett, County Durham, UK.
Posts: 117
Default Re: AVO 8 Mk III Problem

Hi Ed,
Unfortunately the problem occurs with the button cells in place! The meter zeroes on the ohms, ohms divided by 100, settings but not on the ohms times 100, where it seems to just switch off!

Gordon.
__________________
Gordonc
Gordonc is offline  
Old 8th Sep 2013, 10:55 pm   #7
paulsherwin
Moderator
 
paulsherwin's Avatar
 
Join Date: Jun 2003
Location: Oxford, UK
Posts: 27,786
Default Re: AVO 8 Mk III Problem

The first thing to do is double check your work with the battery. Try hooking up a PP3 with croc clips - it won't work properly but the pointer should move.

I use 5 cheap CR2032 lithium cells in mine. If you are using alkalines such as AG13s they will only be 1.5V so you will need 10.
paulsherwin is online now  
Old 8th Sep 2013, 11:04 pm   #8
Gordonc
Pentode
 
Join Date: Sep 2011
Location: Consett, County Durham, UK.
Posts: 117
Default Re: AVO 8 Mk III Problem

Hi Paul,

I am using 5 CR2032 lithium batteries as you are, so I think it must be something else that's causing the problem.

Gordon.
__________________
Gordonc
Gordonc is offline  
Old 9th Sep 2013, 7:52 pm   #9
Ed_Dinning
Dekatron
 
Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 8,171
Default Re: AVO 8 Mk III Problem

Hi Gordon, give me a ring and bring it over some time. I'll dig out my manual for it.

ed
Ed_Dinning is offline  
Old 10th Sep 2013, 6:28 am   #10
Gordonc
Pentode
 
Join Date: Sep 2011
Location: Consett, County Durham, UK.
Posts: 117
Default Re: AVO 8 Mk III Problem

Hi Ed,

Many thanks for the kind offer. I have a copy of the manual. I managed to download a copy. I think I have also managed to solve the problem. It appears to have been a fault with the probe leads. I changed these and hey presto, the meter now zeros on all 3 resistance settings! I also took advice from other forum members who suggested repeatedly pressing the cut out button a few times as it is self cleaning in terms of its contacts. Maybe this also helped.

Gordon
__________________
Gordonc
Gordonc is offline  
Old 14th Sep 2013, 11:51 pm   #11
Gordonc
Pentode
 
Join Date: Sep 2011
Location: Consett, County Durham, UK.
Posts: 117
Default Re: AVO 8 Mk III Problem

To moderators,

The AVO is working fine now. Please close this thread.

Gordon.
__________________
Gordonc
Gordonc is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 6:25 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.