?

[Attachment(s) from Markus Peterson included below]

I truly appreciate the information that I have gotten from everyone. Today I followed around with my dmm and looked for the lowest ohms and found one cap that matched my shorted ohm reading on the 15v rail. So I decided to replace it and look at what we have!

Now time to verify some calibration as the manual suggest, but for a student with his AA and with intent to get my BSEET degree o think my first scope has been a large learning oppurtunity and now I have a working 475a to start troubleshooting other stuff.

Also to the people who suggested applying current to the circuit and using a voltage to frquency convertor, I looked into the circuit and will be constructing a tool to use in future troubleshooting. Again I thank you all for your help and will continue to be an active member here and try to contribute as much as I can.

?

Attachment(s) from Markus Peterson

1 of 1 Photo(s)

I have used a 465 scope since the 70s for repairing stereos, radars,
SSB transceivers, and just about anything else electronic. They are
great work horses. I have developed an emotional bond with mine.

--- In TekScopes@..., "Dale" <dfm4290@...> wrote:

I,m looking at a Tektronix 465 scope tonight to buy for working on

old ham radios.

Just looking for any advise on this scope.
Thanks
Dale

------------------------------------

Yahoo! Groups Links

I,m looking at a Tektronix 465 scope tonight to buy for working on old ham radios.
Just looking for any advise on this scope.
Thanks
Dale

I truly appreciate the information that I have gotten from everyone. Today
I followed around with my dmm and looked for the lowest ohms and found one
cap that matched my shorted ohm reading on the 15v rail. So I decided to
replace it and look at what we have!

Now time to verify some calibration as the manual suggest, but for a
student with his AA and with intent to get my BSEET degree o think my first
scope has been a large learning oppurtunity and now I have a working 475a
to start troubleshooting other stuff.

Also to the people who suggested applying current to the circuit and using
a voltage to frquency convertor, I looked into the circuit and will be
constructing a tool to use in future troubleshooting. Again I thank you all
for your help and will continue to be an active member here and try to
contribute as much as I can.

...Just looking for any advise on this scope.

It is a 400MHz RF sweep generator:



On Fri, 05 Oct 2012 18:33:01 -0000, "iglesia_cristiana_arpas_eternas"
<iglesia_cristiana_arpas_eternas@...> wrote:

Could please some one give a clue about what is the second plugin from
the right in this TM515 frame?.
Thanks in advance..Gabriel.
Link to Pic!!
<>

Hello,

Here's how to do it:

- Compile the code below (you know what to change in the code for various memories)

- Get your NI GPIB adapter and attach it to the scope
- Put NVRAM protection switch (S1002) to forward position
- Turn the scope on

- Run the PC program


Hopefully the result of this is loads and loads of firmware and NVRAM backups uploaded somewhere safe like ko4bb-site.

Have fun.

...

#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include "ni488.h"

void GpibError(const char * msg); /* Error function declaration */

int Device = 0; /* Device unit descriptor */
int BoardIndex = 0; /* Interface Index (GPIB0=0,GPIB1=1,etc.) */

int main(int argc, char *argv[])
{
FILE *outfile;

int f;

unsigned long addr, straddr, endaddr, data;
unsigned short lenght;
unsigned char checksum;
unsigned char str[0x100];

int PrimaryAddress = 29; /* Primary address of the device */
int SecondaryAddress = 0x7E; /* Secondary address of the device */
unsigned char Buffer1[0x500]; /* Read buffer */


Device = ibdev( /* Create a unit descriptor handle */
BoardIndex, /* Board Index (GPIB0 = 0, GPIB1 = 1, ...) */
PrimaryAddress, /* Device primary address */
SecondaryAddress, /* Device secondary address */
T3s, /* Timeout setting (T10s = 10 seconds) */
1, /* Assert EOI line at end of write */
0); /* EOS termination mode */

if (ibsta & ERR) { /* Check for GPIB Error */
GpibError("ibdev Error");
}

ibclr(Device); /* Clear the device */
if (ibsta & ERR) {
GpibError("ibclr Error");
}

/* Attempt to read TDS544A flash ROM contents */

outfile = fopen("KRNLdump.bin","wb");
printf("&#92;n");

// straddr = 0x01000000L; /* Start of flash ROM */
// endaddr = 0x01FFFFFFL; /* End of flash ROM */

// straddr = 0x04000000L; /* Start of TDS544A NVRAM */
// endaddr = 0x0407FFFFL; /* End of TDS544A NVRAM */

straddr = 0x00000000L; /* Start of Kernel ROM */
endaddr = 0x0003FFFFL; /* End of Kernel ROM */

addr = straddr;

do {
/* Read memory message */

str[0] = 'm'; /* m - read memory command */
str[1] = 0x00; /* checksum - fill later */
str[2] = 0x00; /* message lenght MSB */
str[3] = 0x08; /* message lenght LSB */

str[4] = (unsigned char)(addr >> 24 & 0xFF);
str[5] = (unsigned char)(addr >> 16 & 0xFF);
str[6] = (unsigned char)(addr >> 8 & 0xFF);
str[7] = (unsigned char)(addr & 0xFF);

str[8] = 0x00; /* data lenght - try 16 bytes first */
str[9] = 0x00;
str[10] = 0x04;
str[11] = 0x00;

checksum = str[0] + str[2] + str[3];
for(f = 4; f < 12; f++) checksum += str[f];
str[1] = (unsigned char) checksum;

//printf("&#92;nSending:&#92;n");
//for(f = 0; f < 12; f++) printf("%02X ", str[f]);
ibwrt(Device, str, 12); /* Send */
if (ibsta & ERR) GpibError("ibwrt Error");

/* Read Acknowledge (plus-sign msg) */
ibrd(Device, Buffer1, 1); /* Read up to x bytes from the device */
if (ibsta & ERR) GpibError("ibrd Error");
//printf("&#92;nAck reveiced:&#92;n");
//for(f = 0; f < 1; f++) printf("%02X ", Buffer1[f]);

/* Read reply message */
ibrd(Device, Buffer1, 0x404); /* Read up to x bytes from the device */
if (ibsta & ERR) GpibError("ibrd Error");
//printf("&#92;nReceived:&#92;n");
//for(f = 0; f < 0x404; f++) printf("%02X ", Buffer1[f]);

/* Save buffer contents */
for(f = 4; f < 0x404; f++)
{
fputc(Buffer1[f], outfile);
}

/* Send Acknowledgement (plus-sign msg) */
str[0] = '+';
ibwrt(Device, str, 1); /* Send */
if (ibsta & ERR) GpibError("ibwrt Error");

addr += 0x400;

} while(addr <= endaddr);

fclose(outfile);

ibonl(Device, 0); /* Take the device offline */
if (ibsta & ERR) GpibError("ibonl Error");

system("PAUSE");
}


void GpibError(const char *msg) {

printf("%s&#92;n", msg);

printf("ibsta = 0x%x <", ibsta);
if (ibsta & ERR ) printf(" ERR");
if (ibsta & TIMO) printf(" TIMO");
if (ibsta & END ) printf(" END");
if (ibsta & SRQI) printf(" SRQI");
if (ibsta & RQS ) printf(" RQS");
if (ibsta & CMPL) printf(" CMPL");
if (ibsta & LOK ) printf(" LOK");
if (ibsta & REM ) printf(" REM");
if (ibsta & CIC ) printf(" CIC");
if (ibsta & ATN ) printf(" ATN");
if (ibsta & TACS) printf(" TACS");
if (ibsta & LACS) printf(" LACS");
if (ibsta & DTAS) printf(" DTAS");
if (ibsta & DCAS) printf(" DCAS");
printf (" >&#92;n");

printf ("Iberr() = %d", iberr);
if (iberr == EDVR) printf(" EDVR <Driver error>&#92;n");
if (iberr == ECIC) printf(" ECIC <Not Controller-In-Charge>&#92;n");
if (iberr == ENOL) printf(" ENOL <No Listener>&#92;n");
if (iberr == EADR) printf(" EADR <Address error>&#92;n");
if (iberr == EARG) printf(" EARG <Invalid argument>&#92;n");
if (iberr == ESAC) printf(" ESAC <Not System Controller>&#92;n");
if (iberr == EABO) printf(" EABO <Operation aborted>&#92;n");
if (iberr == ENEB) printf(" ENEB <No GPIB board>&#92;n");
if (iberr == EOIP) printf(" EOIP <Async I/O in progress>&#92;n");
if (iberr == ECAP) printf(" ECAP <No capability>&#92;n");
if (iberr == EFSO) printf(" EFSO <File system error>&#92;n");
if (iberr == EBUS) printf(" EBUS <Command error>&#92;n");
if (iberr == ESTB) printf(" ESTB <Status byte lost>&#92;n");
if (iberr == ESRQ) printf(" ESRQ <SRQ stuck on>&#92;n");
if (iberr == ETAB) printf(" ETAB <Table Overflow>&#92;n");
if (iberr == ELCK) printf(" ELCK <Lock error>&#92;n");
if (iberr == EARM) printf(" EARM <Ibnotify rearm error>&#92;n");
if (iberr == EHDL) printf(" EHDL <Invalid Handle>&#92;n");
if (iberr == EWIP) printf(" EWIP <Wait already in progress>&#92;n");
if (iberr == ERST) printf(" ERST <Notification cancelled due to reset>&#92;n");
if (iberr == EPWR) printf(" EPWR <Power error>&#92;n");

printf("Ibcnt() = %u&#92;n", ibcnt);
printf("&#92;n");

/* Call ibonl to take the device and interface offline */
//ibonl(Device, 0);

//system("PAUSE");
//exit(1);
}

?

I'll try? to do it this weekend. Leon Robinson ?? K5JLR Political Correctness is a Political Disease. --- On Wed, 10/3/12, tubesnthings@... wrote: From: tubesnthings@... Subject: Re: [TekScopes] Tek 561A & Fairchild 766H/F To: TekScopes@... Cc: stvalnlbs@... Date: Wednesday, October 3, 2012, 7:33 PM ? Yes, Leon - I would be interested to see catalog pages. Have been looking for any kind of reference to this scope without much luck. It has been "red-tagged", apparently there is a bad tunnel diode in the time base... Not sure I'll ever fix it, but would like to know more. Has very unusual joystick-type trace positioning...wonder what for? Some kind of X-Y work? Panel layouts of the plug-ins resemble 3A72/3A1/3A2/3A6 and 3B3. Curious, to think that both scopes where used at the same facility. Tek for reference, Fairchild for economy and/or space savings by way of the smaller footprint of the cart? Or...?? Bernd ? In a message dated 10/3/2012 5:13:03 P.M. Pacific Daylight Time, leon-robinson@... writes: I can scan of the pages for the Fairchild mainframe and plugins from the 1964/65 catalog if you need them, sorry no manuals. Leon Robinson ?? K5JLR Political Correctness is a Political Disease. --- On Wed, 10/3/12, tubesnthings@... wrote: From: tubesnthings@... Subject: [TekScopes] Tek 561A & Fairchild 766H/F To: TekScopes@... Cc: stvalnlbs@... Date: Wednesday, October 3, 2012, 6:01 PM ? Tek 561A & Fairchild 766H/F, apparently lived at the same "R&D LAB". Plug-ins are mechanically?interchangeable and use interface connectors from the same manufacturer but with different pin count and orientation. The Fairchild is solid state, its cart lighter, smaller with crude tilt adjustment. The sheetmetal scope covers are textured and formed like Tek's. ?

The silver bearing solder Tek used was 3% silver.
The 2% would work fine for ocassional repair. (Relacing the same component location something like 20 times may be a problem...)

- Steve

--- In TekScopes@..., David <davidwhess@> wrote:

The purpose of the silver is to slow down or prevent the tin from
dissolving the silver which is fired onto the strips. I think
Tektronix used 4% silver solder but 2% is better than nothing and I
would not worry about the issue when using it. Some low tin alloys
would work well but they tend to be much more expensive. Using a
lower temperature soldering iron like 600F will help since the
solubility of silver in tin is higher at higher temperatures.

Tektronix usually if not always included a small spool of the silver
solder they used inside of the oscilloscope chassis for working with
the ceramic strips.

On Thu, 4 Oct 2012 14:57:48 -0600, Scott Harris
<scottrharris@> wrote:

Can anyone recommend a good source for the silver solder required when working on the old Tek Ceramic strips?

While I was typing this email I tried googling again and found that Radio Shack sells a 1 oz spool of 62% Sn/26% Pb/ 2& Ag for $5.99.

Is 2% silver content sufficient?

Thanks,
-Scott, N8YY

The purpose of the silver is to slow down or prevent the tin from
dissolving the silver which is fired onto the strips. I think
Tektronix used 4% silver solder but 2% is better than nothing and I
would not worry about the issue when using it. Some low tin alloys
would work well but they tend to be much more expensive. Using a
lower temperature soldering iron like 600F will help since the
solubility of silver in tin is higher at higher temperatures.

Tektronix usually if not always included a small spool of the silver
solder they used inside of the oscilloscope chassis for working with
the ceramic strips.

On Thu, 4 Oct 2012 14:57:48 -0600, Scott Harris
<scottrharris@...> wrote:

Can anyone recommend a good source for the silver solder required when working on the old Tek Ceramic strips?

While I was typing this email I tried googling again and found that Radio Shack sells a 1 oz spool of 62% Sn/26% Pb/ 2& Ag for $5.99.

Is 2% silver content sufficient?

Thanks,
-Scott, N8YY