Re: 10 EASY WAYS TO TROUBLESHOOT WITH AN OSCILLOSCOPE
Yes, the guide seems to be lacking common sense. The comment measuring the line voltage (and frequency) brought a smile. I remember back 40 years or so ago an instructor at a well known university was attempting to show class the waveforms on a triac circuit. I walked out after he connected the scope ground to the hot line and tripped a breaker. Unfortunately, I missed the greater fun, when (I heard later) he managed to get himself connected to the hot side of the line while holding a grounded microphone. The mic went flying....
The suggestion that a scope can be used as an autoranging DMM does not apply for most of the scopes folks have in this group. None of the half dozen scopes I have are autoranging, connecting any of them to line voltage without careful understanding of settings and probe limits would likely result in damage.
|
Re: Lot of 10 scopes (400s & 2400s) with 5 scopemobiles
Siggi,
I am near NH and would be glad to participate in a shared purchase.
I could use one (maybe two) scopes and a cart. No room for much more.
Roy Morgan
K1LKY Western Mass
Near Greenfield.
toggle quoted message
Show quoted text
On Sep 7, 2020, at 11:33 AM, Siggi <siggi@...> wrote:
?Looks like this is the ad:
?
On Mon, Sep 7, 2020 at 11:11 AM greenboxmaven via groups.io <ka2ivy=
[email protected]> wrote:
How can I see the posting or contact the seller?
Bruce, KA2IVY
On 9/7/20 10:36 AM, David Berlind wrote:
For sale in NH for $450. I am not affiliated with the seller. But at $45 per scope plus the scopemobiles, that seems like a pretty amazing deal.
|
Re: 10 EASY WAYS TO TROUBLESHOOT WITH AN OSCILLOSCOPE
Well this article assumes you know something about connecting a scope to a
live AC circuit. A differential probe is a great starting point. Also
using a battery powered scope and a making certain no path to ground
exists.
This message sent to you from my mobile device via speech-to-text
technology.
|
TM500 Mainframe common problems for each model?
Hi,
I have a number of TM500 mainframes here I'm working through restoring alongside my collection of modules and I've seem mention of each mainframe having certain quirks and things to look out for and replace etc.
Can anyone with experience with these units list off the common faults you've seen and improvements you've made for the different mainframes?
I currently have 3x TM501, a TM503, a TM503B and a TM5006.
Thanks!
|
Re: Lot of 10 scopes (400s & 2400s) with 5 scopemobiles
Looks like this is the ad: ? On Mon, Sep 7, 2020 at 11:11 AM greenboxmaven via groups.io <ka2ivy= [email protected]> wrote: How can I see the posting or contact the seller?
Bruce, KA2IVY
On 9/7/20 10:36 AM, David Berlind wrote:
For sale in NH for $450. I am not affiliated with the seller. But at $45 per scope plus the scopemobiles, that seems like a pretty amazing deal.
|
Re: Lot of 10 scopes (400s & 2400s) with 5 scopemobiles
How can I see the posting or contact the seller?
Bruce, KA2IVY
toggle quoted message
Show quoted text
On 9/7/20 10:36 AM, David Berlind wrote: For sale in NH for $450. I am not affiliated with the seller. But at $45 per scope plus the scopemobiles, that seems like a pretty amazing deal.
|
Lot of 10 scopes (400s & 2400s) with 5 scopemobiles
For sale in NH for $450. I am not affiliated with the seller. But at $45 per scope plus the scopemobiles, that seems like a pretty amazing deal.
|
Re: EZGPIB and TDS744a screen dump ...
Dave,
Would you be willing to share the details if your solution?
George
toggle quoted message
Show quoted text
On Sep 6, 2020, at 11:51 PM, David Slipper <softfoot@...> wrote:
I gave up on EZGPIB and wrote something in FreeBasic that does the job nicely.
Dave
|
The 4041 Utility ROMpack R04 manual on bitsavers has a couple of interesting rom calls:
- Loadroms is a Soft ROMpack loader that could load ROMs from a file on tape or disk into memory (pg 1-1)
- PROM File System allows ASCII or ITEM files to be read from PROMs as device name PROM0 which is read-only but supports all the BASIC commands other than SAVE (also on pg 1-1)
Two problems with the PROM file system - the Tektronix ROM Carriers are 'almost unobtainable' although I have found two different sources the price is over $50 for a single plastic cover with two EPROMs in the Molex carriers. Second problem is the PRMBLD and RMXFER are two BASIC programs that came with the 4041 "Accessory Kit" for programming 4041 PROMs. I can't find those programs :(
I think it would be relatively easy to make a 4041 ROM Drawer compatible circuit board that would emulate the ROM Drawer with larger EPROMs.
We just need the PRMBLD and RMXFER programs to create the 'tape' file for a PROM0.
The manual indicates on page 7-1 if the PROM0 contains an AUTOLD file, this file will automatically become the default SYSDEV device and the AUTOLD will be loaded automatically at power-up!
|
10 EASY WAYS TO TROUBLESHOOT WITH AN OSCILLOSCOPE
These 10 simple exercises ¡ª beginning with the simplest and moving to the more difficult ¡ª will help sharpen your skills in the field.
|
Re: EZGPIB and TDS744a screen dump ...
I gave up on EZGPIB and wrote something in FreeBasic that does the job nicely.
Dave
|
Re: 1S1 sampling unit; (also 7B53AN & 7A18 plugins)
You get "different" email addresses (some obfuscated, some not) depending on whether or? not you read the list on the website or get individual emails.? I prefer individual emails, and thus I get the messages "uncensored".
IIRC, the website (both here and the old yahoo groups) censors the email addresses to make it harder to "harvest" the list for spam.
Harvey
toggle quoted message
Show quoted text
On 9/6/2020 8:35 PM, David Collier wrote: Hi Garth,
trying again dc888@... can't get your email address for some reason, and mine was cut out of my last message to you/group
|
Re: 1S1 sampling unit; (also 7B53AN & 7A18 plugins)
Hi Garth,
trying again dc888@... can't get your email address for some reason, and mine was cut out of my last message to you/group
|
Re: 1S1 sampling unit; (also 7B53AN & 7A18 plugins)
Hi Garth,
Yes am interested! Dunno how to get your email address presently, mine is dc888@...
Regards,
David Collier
|
Re: Tek 4041 GPIB Controller
Thanx Monty. I will send the $30 off by PayPal today for the tape with all
of the 4041 programs. I am very surprised that the magnetic tapes become
unusable just because the belt pops off once. I would have thought that
the magnetic tape would maintain its flux coding for at least 10 years.
Apparently, all you need is one crease in the tape to render it useless. I
am surprised that Tektronix would use such a feeble technique for storing
programs.
Gary
toggle quoted message
Show quoted text
On Sun, Sep 6, 2020 at 6:48 AM Monty McGraw <mmcgraw74@...> wrote: Gary,
Thanks for the tip, but both tapes I tried had working belts and worked in
my other 4041.
I don't hear any tape motor noise on the 'new' 4041.
Have you downloaded and read the 4041 GPIB Programming Guide?:
This guide is more of a tutorial approach to writing programs for the 4041.
I will be putting four NOS tapes into the dehydrator this morning to start
baking them for 2 days.
I should have a new full System Verification Tape with your AUTOLD file
ready to ship by end of this week.
$30 to my Paypal: mcgrawmd@... will cover the cost including
shipping to your Monrovia address like last time.
Monty
On Sat, Sep 5, 2020 at 9:01 PM Gary Robert Bosworth <grbosworth@...>
wrote:
Monty: That 840 Error Message means the drive belt came off the rollers
and the tape is not moving. The tapes are not attached on either end as I
am sure you are well aware. There are a series of holes punched into the
magnetic tape, and if the LED optical system does not detect the holes,
then it gives the 840 error message. There is nothing wrong with your
lamp/sensor circuit. Please don't mess with the sensors or you will have
real problems to cope with.
I still would like to buy 1 more 4041 tape with all of the files on it.
Please let me know if you have the time to produce it. Thanx.
Gary
On Sat, Sep 5, 2020 at 8:02 AM Monty McGraw <mmcgraw74@...> wrote:
I just received my EBAY purchase of another 4041 - this time with the DDU
disk drive unit attached.
The auction indicated they were working at the time they were taken out of
service - I'm not so sure of that, but both 4041 and DDU powered up during
my test last night.
However, even though the 4041 powered up, showed v2.1 firmware and
512KB
of memory, the LED display showed a prompt, so I suspected it did not load
any AUTOLD file from the DDU.
There are SCSI DIP switches on the 4041 rear panel for SCSI Option 03, one
of which changes the default storage from internal tape drive to DDU
hard
disk - and that switch was set to DDU hard disk.
Looking at the front of the DDU, I could see the hard drive LED
blinking
three times, repeatedly. The DDU service manual indicated in the
Shugart
hard drive section that this meant the spindle failed to come up to speed :(
I turned off both units and changed that switch to tape, powered up the
4041 by itself with one of my tapes, but got an error on the LED
display
indicating 840 Lamp/Servo failure.
The tape did not move, so it appears I need to troubleshoot the tape
Lamp
circuit.
In the meantime, I pulled off the right side cover and did my front
panel
board mod to allow my USB to TTL serial adapter to be used with the
front
panel keyboard connector.
- Power off the 4041.
- Remove the 4041 two rear plastic "corners" securing the right panel
and
slide off the right panel.
- I dipped my desolder braid in flux, place the braid on the pad and apply
your hot soldering iron to the braid and resistor lead to suck the
solder
completely from the pad. Be sure to cut off the braid and apply fresh flux
before desoldering the pad for each resistor.
- Unsolder and lift the 'left' side of the two resistors closest to the
unused J86 connector as shown in my resistor mod photo: [4041 Resistor Mod](
/g/TekScopes/photo/247590/4?p=Created,,,20,2,0,0)
- Solder a 1K ohm resistor into the hole (I first cut the resistor lead
down to .25 inch).
- Then solder the tomb-stoned 1K ohm resistor to the lower resistor and
clip off any extra leads per my photo
- Replace the right side panel to ensure proper 4041 cooling.
- Connect your TTL Serial interface ground to the top left keyboard
connector female contact.
- Connect your TTL Serial interface TX to the lower left keyboard
connector male pin.
- Configure your TTL Serial interface for 4800N2 speed, parity, stop bits.
- Power on the 4041 and you should be able to type on your PC using the
TTL Serial interface - and see your typed characters on the front panel LED
I only use this TTL Serial interface to bootstrap to the rear panel
COMM0
interface (if you have the Programmer ROMs installed in the ROM tray behind
the front panel grill):
1. Type "SET DRIVER "COMM0(BAU=9600,FLA=BID,EDIT=STORAGE):"
2. Type "SET CONSOLE "COMM0(ECHO=YES):"
I find the EDIT=STORAGE parameter is easier to use when correcting PC
typing errors, as the console will echo back each character you are
deleting.
After the 4041 keyboard mod, I used my PC to type the command to
format a
DDU 5 1/4" floppy, and to run the DDU service manual program to do
write
and read performance tests on the floppy.
I got 1117 Bytes per second, which meets the 1000 bytes per second
listed
in the floppy spec.
So my DDU SCSI controller and floppy drive are working and I've
ordered a
Seagate 40MB ST-506 drive to replace the failed Shugart drive.
I also noticed my new 4041 has a newer CPU board which includes the memory
on the CPU board and also only has four EPROMs!
The 4041 service manual indicates 4041 serial numbers B070100 and above
have this CPU board.
The service manual also indicates two of the EPROMs contain 128KB of
system ROMs - 28KB more than the earlier CPU boards. I believe the
additional 28KB is the UTL2 ROM only available for these CPU boards.
The service manual indicates the Option 10 for this CPU board is the
two
additional 27256 EPROMs, which contain the R01 Graphics, R02 Plotting, R03
Signal Processing, R04 Utility1 option ROMs, which leaves room in the
ROM
drawer for developer ROMs to be installed.
I ran the ASK$("ROMPACKS") command and got the list of all those option
ROMs and the UTL2.
I will capture the two Option EPROM images and post them on my 4041 github
repository sometime this weekend.
--
Gary Robert Bosworth
grbosworth@...
Tel: 310-317-2247
--
Gary Robert Bosworth
grbosworth@...
Tel: 310-317-2247
|
Re: Tek 4041 GPIB Controller
Gary,
I suspected since I didn't hear any tape motor that the capstan might be
stuck, so I used one of my 'tape tension wooden chopsticks" to gently try
to free up the drive capstan - and now the tape drive works with my tapes!
Since this 4041 likely came with this DDU - they may have never used the
tape drive - the head is nice and shiny.
I also fixed my printer - using the maintenance manual instructions: simply
turn the white plastic timing gear housing (which breaks the glyptol seal)
until the printout is ok.
I did that yesterday - now I need to get some nail polish to replace the
seal.
Monty
toggle quoted message
Show quoted text
On Sun, Sep 6, 2020 at 8:48 AM Monty McGraw <mmcgraw74@...> wrote: Gary,
Thanks for the tip, but both tapes I tried had working belts and worked in
my other 4041.
I don't hear any tape motor noise on the 'new' 4041.
Have you downloaded and read the 4041 GPIB Programming Guide?:
This guide is more of a tutorial approach to writing programs for the 4041.
I will be putting four NOS tapes into the dehydrator this morning to start
baking them for 2 days.
I should have a new full System Verification Tape with your AUTOLD file
ready to ship by end of this week.
$30 to my Paypal: mcgrawmd@... will cover the cost including
shipping to your Monrovia address like last time.
Monty
On Sat, Sep 5, 2020 at 9:01 PM Gary Robert Bosworth <grbosworth@...>
wrote:
Monty: That 840 Error Message means the drive belt came off the rollers
and the tape is not moving. The tapes are not attached on either end as I
am sure you are well aware. There are a series of holes punched into the
magnetic tape, and if the LED optical system does not detect the holes,
then it gives the 840 error message. There is nothing wrong with your
lamp/sensor circuit. Please don't mess with the sensors or you will have
real problems to cope with.
I still would like to buy 1 more 4041 tape with all of the files on it.
Please let me know if you have the time to produce it. Thanx.
Gary
On Sat, Sep 5, 2020 at 8:02 AM Monty McGraw <mmcgraw74@...> wrote:
I just received my EBAY purchase of another 4041 - this time with the DDU
disk drive unit attached.
The auction indicated they were working at the time they were taken out of
service - I'm not so sure of that, but both 4041 and DDU powered up during
my test last night.
However, even though the 4041 powered up, showed v2.1 firmware and 512KB
of memory, the LED display showed a prompt, so I suspected it did not load
any AUTOLD file from the DDU.
There are SCSI DIP switches on the 4041 rear panel for SCSI Option 03, one
of which changes the default storage from internal tape drive to DDU hard
disk - and that switch was set to DDU hard disk.
Looking at the front of the DDU, I could see the hard drive LED blinking
three times, repeatedly. The DDU service manual indicated in the Shugart
hard drive section that this meant the spindle failed to come up to speed :(
I turned off both units and changed that switch to tape, powered up the
4041 by itself with one of my tapes, but got an error on the LED display
indicating 840 Lamp/Servo failure.
The tape did not move, so it appears I need to troubleshoot the tape
Lamp
circuit.
In the meantime, I pulled off the right side cover and did my front panel
board mod to allow my USB to TTL serial adapter to be used with the front
panel keyboard connector.
- Power off the 4041.
- Remove the 4041 two rear plastic "corners" securing the right panel and
slide off the right panel.
- I dipped my desolder braid in flux, place the braid on the pad and apply
your hot soldering iron to the braid and resistor lead to suck the solder
completely from the pad. Be sure to cut off the braid and apply fresh flux
before desoldering the pad for each resistor.
- Unsolder and lift the 'left' side of the two resistors closest to the
unused J86 connector as shown in my resistor mod photo: [4041 Resistor Mod](
/g/TekScopes/photo/247590/4?p=Created,,,20,2,0,0)
- Solder a 1K ohm resistor into the hole (I first cut the resistor lead
down to .25 inch).
- Then solder the tomb-stoned 1K ohm resistor to the lower resistor and
clip off any extra leads per my photo
- Replace the right side panel to ensure proper 4041 cooling.
- Connect your TTL Serial interface ground to the top left keyboard
connector female contact.
- Connect your TTL Serial interface TX to the lower left keyboard
connector male pin.
- Configure your TTL Serial interface for 4800N2 speed, parity, stop bits.
- Power on the 4041 and you should be able to type on your PC using the
TTL Serial interface - and see your typed characters on the front panel LED
I only use this TTL Serial interface to bootstrap to the rear panel
COMM0
interface (if you have the Programmer ROMs installed in the ROM tray behind
the front panel grill):
1. Type "SET DRIVER "COMM0(BAU=9600,FLA=BID,EDIT=STORAGE):"
2. Type "SET CONSOLE "COMM0(ECHO=YES):"
I find the EDIT=STORAGE parameter is easier to use when correcting PC
typing errors, as the console will echo back each character you are
deleting.
After the 4041 keyboard mod, I used my PC to type the command to format a
DDU 5 1/4" floppy, and to run the DDU service manual program to do write
and read performance tests on the floppy.
I got 1117 Bytes per second, which meets the 1000 bytes per second listed
in the floppy spec.
So my DDU SCSI controller and floppy drive are working and I've ordered a
Seagate 40MB ST-506 drive to replace the failed Shugart drive.
I also noticed my new 4041 has a newer CPU board which includes the memory
on the CPU board and also only has four EPROMs!
The 4041 service manual indicates 4041 serial numbers B070100 and above
have this CPU board.
The service manual also indicates two of the EPROMs contain 128KB of
system ROMs - 28KB more than the earlier CPU boards. I believe the
additional 28KB is the UTL2 ROM only available for these CPU boards.
The service manual indicates the Option 10 for this CPU board is the two
additional 27256 EPROMs, which contain the R01 Graphics, R02 Plotting, R03
Signal Processing, R04 Utility1 option ROMs, which leaves room in the ROM
drawer for developer ROMs to be installed.
I ran the ASK$("ROMPACKS") command and got the list of all those option
ROMs and the UTL2.
I will capture the two Option EPROM images and post them on my 4041 github
repository sometime this weekend.
--
Gary Robert Bosworth
grbosworth@...
Tel: 310-317-2247
|
Re: Tek 4041 GPIB Controller
Gary, Thanks for the tip, but both tapes I tried had working belts and worked in my other 4041. I don't hear any tape motor noise on the 'new' 4041. Have you downloaded and read the 4041 GPIB Programming Guide?: This guide is more of a tutorial approach to writing programs for the 4041. I will be putting four NOS tapes into the dehydrator this morning to start baking them for 2 days. I should have a new full System Verification Tape with your AUTOLD file ready to ship by end of this week. $30 to my Paypal: mcgrawmd@... will cover the cost including shipping to your Monrovia address like last time. Monty On Sat, Sep 5, 2020 at 9:01 PM Gary Robert Bosworth <grbosworth@...> wrote: Monty: That 840 Error Message means the drive belt came off the rollers
and the tape is not moving. The tapes are not attached on either end as I
am sure you are well aware. There are a series of holes punched into the
magnetic tape, and if the LED optical system does not detect the holes,
then it gives the 840 error message. There is nothing wrong with your
lamp/sensor circuit. Please don't mess with the sensors or you will have
real problems to cope with.
I still would like to buy 1 more 4041 tape with all of the files on it.
Please let me know if you have the time to produce it. Thanx.
Gary
On Sat, Sep 5, 2020 at 8:02 AM Monty McGraw <mmcgraw74@...> wrote:
I just received my EBAY purchase of another 4041 - this time with the DDU
disk drive unit attached.
The auction indicated they were working at the time they were taken out of
service - I'm not so sure of that, but both 4041 and DDU powered up during
my test last night.
However, even though the 4041 powered up, showed v2.1 firmware and 512KB
of memory, the LED display showed a prompt, so I suspected it did not load
any AUTOLD file from the DDU.
There are SCSI DIP switches on the 4041 rear panel for SCSI Option 03, one
of which changes the default storage from internal tape drive to DDU hard
disk - and that switch was set to DDU hard disk.
Looking at the front of the DDU, I could see the hard drive LED blinking
three times, repeatedly. The DDU service manual indicated in the Shugart
hard drive section that this meant the spindle failed to come up to speed :(
I turned off both units and changed that switch to tape, powered up the
4041 by itself with one of my tapes, but got an error on the LED display
indicating 840 Lamp/Servo failure.
The tape did not move, so it appears I need to troubleshoot the tape Lamp
circuit.
In the meantime, I pulled off the right side cover and did my front panel
board mod to allow my USB to TTL serial adapter to be used with the front
panel keyboard connector.
- Power off the 4041.
- Remove the 4041 two rear plastic "corners" securing the right panel and
slide off the right panel.
- I dipped my desolder braid in flux, place the braid on the pad and
apply
your hot soldering iron to the braid and resistor lead to suck the solder
completely from the pad. Be sure to cut off the braid and apply fresh flux
before desoldering the pad for each resistor.
- Unsolder and lift the 'left' side of the two resistors closest to the
unused J86 connector as shown in my resistor mod photo: [4041 Resistor Mod](
/g/TekScopes/photo/247590/4?p=Created,,,20,2,0,0)
- Solder a 1K ohm resistor into the hole (I first cut the resistor lead
down to .25 inch).
- Then solder the tomb-stoned 1K ohm resistor to the lower resistor and
clip off any extra leads per my photo
- Replace the right side panel to ensure proper 4041 cooling.
- Connect your TTL Serial interface ground to the top left keyboard
connector female contact.
- Connect your TTL Serial interface TX to the lower left keyboard
connector male pin.
- Configure your TTL Serial interface for 4800N2 speed, parity, stop bits.
- Power on the 4041 and you should be able to type on your PC using the
TTL Serial interface - and see your typed characters on the front panel LED
I only use this TTL Serial interface to bootstrap to the rear panel COMM0
interface (if you have the Programmer ROMs installed in the ROM tray
behind
the front panel grill):
1. Type "SET DRIVER "COMM0(BAU=9600,FLA=BID,EDIT=STORAGE):"
2. Type "SET CONSOLE "COMM0(ECHO=YES):"
I find the EDIT=STORAGE parameter is easier to use when correcting PC
typing errors, as the console will echo back each character you are
deleting.
After the 4041 keyboard mod, I used my PC to type the command to format a
DDU 5 1/4" floppy, and to run the DDU service manual program to do write
and read performance tests on the floppy.
I got 1117 Bytes per second, which meets the 1000 bytes per second listed
in the floppy spec.
So my DDU SCSI controller and floppy drive are working and I've ordered a
Seagate 40MB ST-506 drive to replace the failed Shugart drive.
I also noticed my new 4041 has a newer CPU board which includes the memory
on the CPU board and also only has four EPROMs!
The 4041 service manual indicates 4041 serial numbers B070100 and above
have this CPU board.
The service manual also indicates two of the EPROMs contain 128KB of
system ROMs - 28KB more than the earlier CPU boards. I believe the
additional 28KB is the UTL2 ROM only available for these CPU boards.
The service manual indicates the Option 10 for this CPU board is the two
additional 27256 EPROMs, which contain the R01 Graphics, R02 Plotting, R03
Signal Processing, R04 Utility1 option ROMs, which leaves room in the ROM
drawer for developer ROMs to be installed.
I ran the ASK$("ROMPACKS") command and got the list of all those option
ROMs and the UTL2.
I will capture the two Option EPROM images and post them on my 4041 github
repository sometime this weekend.
--
Gary Robert Bosworth
grbosworth@...
Tel: 310-317-2247
|
The following files have been uploaded to
the Files area of the [email protected] group.
By: David C. Partridge
|
Re: 1S1 sampling unit; (also 7B53AN & 7A18 plugins)
Hi David C
I do not know where my messages go to on this site, I have sent a couple of them re your 1S1.
I am in Gosford and have a 545B scope.Email me if you are interested.
|
Re: Tek 7854 intermittent issues
Alright, thank you for the tip, that will be very helpful.
|
Bob Headrick
Randy.AB9GO
Jared Cabot
Glydeck
Gary Robert Bosworth