3 Jul
2018
3 Jul
'18
2:19 p.m.
---------- Forwarded message ---------
From: Pete Lancashire <pete at petelancashire.com>
Date: Tue, Jul 3, 2018, 2:18 PM
Subject: Re: Looking for Tektronix 4051 or 4052 Display Board
To: Monty McGraw <mmcgraw74 at gmail.com>
Yeah the two display boards went to Europe.
If anybody needs three perfectly good 11 inch CRTs, deflection yolks
excetera come to Portland Oregon and they're yours or have somebody pick
them up for you they're in the scrap pile and scrap is going in about a
month. Each CRT contains about $35 worth of gold.
On Tue, Jul 3, 2018, 2:12 PM Monty McGraw <mmcgraw74 at gmail.com> wrote:
Pete,
I'm in Texas near Houston.
The Display Board is the vertical board to the left of the CRT. It has
several cables at the bottom to pin headers and the cable to the neck of
the CRT.
It also has connectors to the power transistors that simply unplug when
you remove the Display Board.
Here is a picture of a display board:
https://drive.google.com/file/d/0Bxd4qJinVzkNOFZacFZSYVJwaHc/view?usp=shari…
Monty
On Tue, Jul 3, 2018 at 4:01 PM, Pete Lancashire <pete at petelancashire.com>
wrote:
Is 206 Washington ? I have the remains of a 4051
4052 and 4010 terminal
sitting outside in the scrap pile. Parts have gone to Europe but they're
still pieces left over
They were about 25 miles west of Portland Oregon.
On Tue, Jul 3, 2018, 1:35 PM Ian Finder via cctalk <cctalk at classiccmp.org>
wrote:
> These systems are rare enough that it's probably worth fixing instead of
> treating the board as a simple FRU. There are schematics on bitsavers for
> that board, and they are complete.
>
> On Tue, Jul 3, 2018 at 1:21 PM, Monty McGraw via cctalk <
> cctalk at classiccmp.org> wrote:
>
> > I've been repairing my Tektronix 4052.
> >
> > I've got the digital logic working - but the text and graphics are
> messed
> > up.
> >
> > I posted photos of the screens in my Tektronix 4052 troubleshooting
> thread
> > on vcfed.
> >
> > With a scope on the final X amplifier stage - it is oscillating - so I
> see
> > weird horizontal strokes instead of dots for text. I know from the
> service
> > manual that this circuit includes a feedback loop, and with the scope
> I see
> > oscillation all around the loop - so I haven't found the source.
> >
> > Does anyone have a spare Tektronix 4052 (or 4051) Display Board that I
> > could buy?
> >
> > Thanks,
> > Monty
> >
>
>
>
> --
> Ian Finder
> (206) 395-MIPS
> ian.finder at gmail.com
>
>
3 Jul
3 Jul
2:25 p.m.
New subject: Looking for Tektronix 4051 or 4052 Display Board
Pete,
Thanks for checking on the display board.
Are any of the other boards, power supplies or keyboards left in the 4051
or 4052?
Monty
On Tue, Jul 3, 2018 at 4:19 PM, Pete Lancashire via cctalk <
cctalk at classiccmp.org> wrote:
---------- Forwarded message ---------
From: Pete Lancashire <pete at petelancashire.com>
Date: Tue, Jul 3, 2018, 2:18 PM
Subject: Re: Looking for Tektronix 4051 or 4052 Display Board
To: Monty McGraw <mmcgraw74 at gmail.com>
Yeah the two display boards went to Europe.
If anybody needs three perfectly good 11 inch CRTs, deflection yolks
excetera come to Portland Oregon and they're yours or have somebody pick
them up for you they're in the scrap pile and scrap is going in about a
month. Each CRT contains about $35 worth of gold.
On Tue, Jul 3, 2018, 2:12 PM Monty McGraw <mmcgraw74 at gmail.com> wrote:
Pete,
I'm in Texas near Houston.
The Display Board is the vertical board to the left of the CRT. It has
several cables at the bottom to pin headers and the cable to the neck of
the CRT.
It also has connectors to the power transistors that simply unplug when
you remove the Display Board.
Here is a picture of a display board:
https://drive.google.com/file/d/0Bxd4qJinVzkNOFZacFZSYVJwaHc/
view?usp=sharing
Monty
On Tue, Jul 3, 2018 at 4:01 PM, Pete Lancashire <pete at petelancashire.com
wrote:
> Is 206 Washington ? I have the remains of a 4051 4052 and 4010 terminal
> sitting outside in the scrap pile. Parts have gone to Europe but they're
> still pieces left over
>
>
> They were about 25 miles west of Portland Oregon.
>
>
>
> On Tue, Jul 3, 2018, 1:35 PM Ian Finder via cctalk <
cctalk at
classiccmp.org>
> wrote:
>
>> These systems are rare enough that it's probably worth fixing instead
of
>> treating the board as a simple FRU. There
are schematics on bitsavers
for
>> that board, and they are complete.
>>
>> On Tue, Jul 3, 2018 at 1:21 PM, Monty McGraw via cctalk <
>> cctalk at classiccmp.org> wrote:
>>
>> > I've been repairing my Tektronix 4052.
>> >
>> > I've got the digital logic working - but the text and graphics are
>> messed
>> > up.
>> >
>> > I posted photos of the screens in my Tektronix 4052 troubleshooting
>> thread
>> > on vcfed.
>> >
>> > With a scope on the final X amplifier stage - it is oscillating - so
I
>> see
>> > weird horizontal strokes instead of dots for text. I know from the
>> service
>> > manual that this circuit includes a feedback loop, and with the scope
>> I see
>> > oscillation all around the loop - so I haven't found the source.
>> >
>> > Does anyone have a spare Tektronix 4052 (or 4051) Display Board that
I
> >
could buy?
> >
> > Thanks,
> > Monty
> >
>
>
>
> --
> Ian Finder
> (206) 395-MIPS
> ian.finder at gmail.com
>
>
2:55 p.m.
New subject: Looking for Tektronix 4051 or 4052 Display Board
Hi Monty,
My 4051, which I have had for a couple of years now, has failed with a display problem
very similar to yours, likely a power supply issue.
The characters all look funny, but I am able to type in a 10 PRINT "HELLO" 20
GOTO 10 and it fills the screen, so at least the processor is running.
I will open it up in the coming days. I will take pictures and scope shots, and let you
know what I find.
Good luck, fellow 405x owner!
Randy
________________________________
From: cctalk <cctalk-bounces at classiccmp.org> on behalf of Monty McGraw via cctalk
<cctalk at classiccmp.org>
Sent: Tuesday, July 3, 2018 2:25 PM
To: Pete Lancashire; General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Looking for Tektronix 4051 or 4052 Display Board
Pete,
Thanks for checking on the display board.
Are any of the other boards, power supplies or keyboards left in the 4051
or 4052?
Monty
On Tue, Jul 3, 2018 at 4:19 PM, Pete Lancashire via cctalk <
cctalk at classiccmp.org> wrote:
---------- Forwarded message ---------
From: Pete Lancashire <pete at petelancashire.com>
Date: Tue, Jul 3, 2018, 2:18 PM
Subject: Re: Looking for Tektronix 4051 or 4052 Display Board
To: Monty McGraw <mmcgraw74 at gmail.com>
Yeah the two display boards went to Europe.
If anybody needs three perfectly good 11 inch CRTs, deflection yolks
excetera come to Portland Oregon and they're yours or have somebody pick
them up for you they're in the scrap pile and scrap is going in about a
month. Each CRT contains about $35 worth of gold.
On Tue, Jul 3, 2018, 2:12 PM Monty McGraw <mmcgraw74 at gmail.com> wrote:
> Pete,
>
> I'm in Texas near Houston.
>
> The Display Board is the vertical board to the left of the CRT. It has
> several cables at the bottom to pin headers and the cable to the neck of
> the CRT.
> It also has connectors to the power transistors that simply unplug when
> you remove the Display Board.
>
> Here is a picture of a display board:
> https://drive.google.com/file/d/0Bxd4qJinVzkNOFZacFZSYVJwaHc/
[https://lh4.googleusercontent.com/GizYrL4sWJr7c9n5zFCwd8m1UP22bKXbcwOpG7s44…
GAS6800A_CRT2.JPG<https://drive.google.com/file/d/0Bxd4qJinVzkNOFZacFZSY…
drive.google.com
view?usp=sharing
Monty
On Tue, Jul 3, 2018 at 4:01 PM, Pete Lancashire <pete at petelancashire.com
wrote:
> Is 206 Washington ? I have the remains of a 4051 4052 and 4010 terminal
> sitting outside in the scrap pile. Parts have gone to Europe but they're
> still pieces left over
>
>
> They were about 25 miles west of Portland Oregon.
>
>
>
> On Tue, Jul 3, 2018, 1:35 PM Ian Finder via cctalk <
cctalk at
classiccmp.org>
> wrote:
>
>> These systems are rare enough that it's probably worth fixing instead
of
>> treating the board as a simple FRU. There
are schematics on bitsavers
for
>> that board, and they are complete.
>>
>> On Tue, Jul 3, 2018 at 1:21 PM, Monty McGraw via cctalk <
>> cctalk at classiccmp.org> wrote:
>>
>> > I've been repairing my Tektronix 4052.
>> >
>> > I've got the digital logic working - but the text and graphics are
>> messed
>> > up.
>> >
>> > I posted photos of the screens in my Tektronix 4052 troubleshooting
>> thread
>> > on vcfed.
>> >
>> > With a scope on the final X amplifier stage - it is oscillating - so
I
>> see
>> > weird horizontal strokes instead of dots for text. I know from the
>> service
>> > manual that this circuit includes a feedback loop, and with the scope
>> I see
>> > oscillation all around the loop - so I haven't found the source.
>> >
>> > Does anyone have a spare Tektronix 4052 (or 4051) Display Board that
I
> >
could buy?
> >
> > Thanks,
> > Monty
> >
>
>
>
> --
> Ian Finder
> (206) 395-MIPS
> ian.finder at gmail.com
>
>
9:08 p.m.
New subject: Looking for Tektronix 4051 or 4052 Display Board
Yes but they're in pretty bad shape the units are under a tarp in a Briar
Patch for about 2 years in the Pacific Northwest. Amazingly enough one of
the deflection boards had enough working parts the CPU board for the 4051
was so corroded the lids fell off the chips. I only kept them to offer the
CRTs.
On Tue, Jul 3, 2018, 2:25 PM Monty McGraw <mmcgraw74 at gmail.com> wrote:
Pete,
Thanks for checking on the display board.
Are any of the other boards, power supplies or keyboards left in the 4051
or 4052?
Monty
On Tue, Jul 3, 2018 at 4:19 PM, Pete Lancashire via cctalk <
cctalk at classiccmp.org> wrote:
---------- Forwarded message ---------
From: Pete Lancashire <pete at petelancashire.com>
Date: Tue, Jul 3, 2018, 2:18 PM
Subject: Re: Looking for Tektronix 4051 or 4052 Display Board
To: Monty McGraw <mmcgraw74 at gmail.com>
Yeah the two display boards went to Europe.
If anybody needs three perfectly good 11 inch CRTs, deflection yolks
excetera come to Portland Oregon and they're yours or have somebody pick
them up for you they're in the scrap pile and scrap is going in about a
month. Each CRT contains about $35 worth of gold.
On Tue, Jul 3, 2018, 2:12 PM Monty McGraw <mmcgraw74 at gmail.com> wrote:
Pete,
I'm in Texas near Houston.
The Display Board is the vertical board to the left of the CRT. It has
several cables at the bottom to pin headers and the cable to the neck of
the CRT.
It also has connectors to the power transistors that simply unplug when
you remove the Display Board.
Here is a picture of a display board:
https://drive.google.com/file/d/0Bxd4qJinVzkNOFZacFZSYVJwaHc/view?usp=shari…
Monty
On Tue, Jul 3, 2018 at 4:01 PM, Pete Lancashire <
pete at
petelancashire.com>
wrote:
> Is 206 Washington ? I have the remains of a 4051 4052 and 4010 terminal
> sitting outside in the scrap pile. Parts have gone to Europe but
they're
> still pieces left over
>
>
> They were about 25 miles west of Portland Oregon.
>
>
>
> On Tue, Jul 3, 2018, 1:35 PM Ian Finder via cctalk <
cctalk at
classiccmp.org>
> wrote:
>
>> These systems are rare enough that it's probably worth fixing instead
of
>> treating the board as a simple FRU. There
are schematics on bitsavers
for
>> that board, and they are complete.
>>
>> On Tue, Jul 3, 2018 at 1:21 PM, Monty McGraw via cctalk <
>> cctalk at classiccmp.org> wrote:
>>
>> > I've been repairing my Tektronix 4052.
>> >
>> > I've got the digital logic working - but the text and graphics are
>> messed
>> > up.
>> >
>> > I posted photos of the screens in my Tektronix 4052 troubleshooting
>> thread
>> > on vcfed.
>> >
>> > With a scope on the final X amplifier stage - it is oscillating -
so
I
>> see
>> > weird horizontal strokes instead of dots for text. I know from the
>> service
>> > manual that this circuit includes a feedback loop, and with the
scope
>> I see
>> > oscillation all around the loop - so I haven't found the source.
>> >
>> > Does anyone have a spare Tektronix 4052 (or 4051) Display Board
that
I
> >
could buy?
> >
> > Thanks,
> > Monty
> >
>
>
>
> --
> Ian Finder
> (206) 395-MIPS
> ian.finder at gmail.com
>
>
2146
days inactive
2147
days old
3 comments
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participants (3)
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mmcgraw74＠gmail.com -
pete＠petelancashire.com -
rdawson16＠hotmail.com