开云体育

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Chuck Harris
Sent: 26 August 2018 14:57
To: [email protected]
Subject: Re: [TekScopes] Tek 2467b test 05 error

Just in case anyone wonders: Every time those of you that use
the groups.io website to post, post, and then see a mistake and
edit your post, and submit that change, and see a mistake and
edit your post, and submit that change, and see an error and
edit your post, and submit that change, and seen another error
and edit your post, and submit that change...

We who get this group by email, which is virtually all of us,
get another nearly identical copy of your post, with the words
[Edited Message Follows] affixed to the top.

Food for thought.

-Chuck Harris

Sscandizzo@... wrote:

[Edited Message Follows]

Hi Guys,

Update time. Finally got in (stripped torx heads are no fun - drilled it out.)

I went to J119 and checked the voltages. Two points failed:
J119-5 (-4.965 to -5.035) measured -4.53
J119-11 (-7.88 to -8.12) measured -6.30

To answer Siggi's question, I'm comfortable around old computers (6504's and 8086/88's) and replacing both chips and discrete components.

I don't think I am properly measuring total p-p ripple; my values seem significantly less than (a factor of 10) the tolerances. AND I have no clue how to measure the p-p at 2x line frequency. I suspect it's obvious, but I'm at a total loss.

All the boards appear to be from 1987 and populated with late '88 chips & hybrids. Not a single smd to be found (correction, a small daughter card about 0.5" x 2" near the top right of the main board).

-Stefan