开云体育

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

On Sun, Sep 6, 2020 at 12:30 AM Nick Corvid <awsomedrack@...> wrote:

I imagine that you can't get proper readings with the boards out? Shame
that they made it so hard to service without many extra pieces of
equipment/accessories.

Could you send me a link to those files? Would no doubt prove useful for
future repairs.

Guess as soon as I'm able I'll dig through my manual and try and find some
good test spots for the 5 and 12 volt that I can reach.

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.

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Nick Corvid
Sent: 05 September 2020 06:36
To: [email protected]
Subject: Re: [TekScopes] Tek 7854 intermittent issues

Alright I've checked all the power supply test points I knew the location of (A12,A22,A17) Except I didn't get that digital supply David mentioned, which I'm not sure where the test points are, how to reach them, or what the specs are for that.

Of the stuff I checked though everything came out relatively normal from what I could measure with my less than great instruments, well all but one thing, TP126 for the +108 volts that read 108.5 volts which is barely in spec but had some funky ripple pictured here on my auxiliary scope: /g/TekScopes/photo/252782/0?p=Created,,,20,2,0,0 . That was the only thing I saw that was out of the ordinary so far.

On Saturday, September 5, 2020, 12:29:45 AM PDT, Egge Siert <eggeja2@...> wrote:

Hi Dave,

You mean x010101 (the first of the production). I also have P7001 Manuals referring to B07xxxx and B09xxxx SN's.

Greetings,

Egge Siert