1. Tektronix User Manual

Tek 015-0611-00 Programmable Pulse Head Service Manual, PDF, 2.6M. Tek 11401 Oscilloscope All boards ROMs. Tek 7250 Digitizing Oscilloscope Service Manual, PDF, 6.5M. Tek CFG250 Function Generator Operator. Tektronix - 2710 Spectrum Analyzer, Directory. Tektronix - 2712, Directory. Tektronix - 2753. No information is available for this page.Learn why.

Failure Occurrences Avg. Turnaround Time (Days) Calibration Required 3 - 18 Defective Battery 1 $429.00 107 Defective Menu Functions 1 - 1 Defective Power Supply 3 $1,479.00 68 Defective Primary Frequency Control 1 $2,349.00 39 Defective Tracking Generator 1 $829.00 62 Display Failure 1 $2,895.25 247 Does Not Power On 3 $1,374.68 41 Multiple Problems 12 $1,440.88 33 Primary Deflection Horizontal Amplifier 1 $1,129.00 197 Occurrences Number of times we've repaired this model for the given failure. Price of Service The average total service bill for this model for the given failure. Keep in mind this is an average and is not indicative of your unit. Calibration, Parts, etc. Can cause fluctuations in repair prices. Turnaround Time This is the average number of days it takes to repair the given failure.

This is based on the number of days from the time the item is received to when we send you our evaluation plus the number of days from when we receive your approval to when we ship it out.

This is a full featured but broken Tek spectrum analyser. It has the tracking generator, 300Hz filter, high res counter and video option installed. It was a gift from a circuits online member who did not had any use for it, and had no time to repair it. It seems to do something, all buttons react, i see a trace and it boots up.

But the read out is a blur and there is a raster of dots on the display. All coax-patchcables were not connected, so first some puzzling to make all the right connections before powering up. A first inspection of the PSU rails showed some very dirty signals, wobbling voltages and rather big ripples. So first job, remove the psu board and check caps. I rather do the checking by measuring with a probes under power but it is very hard to find the caps from the bottom side and the topside is covered with the rest of the SA.

It is a bit stuffed so to say. Display problem Service manual: I changed all electrolytic caps. A few turned out to be allready replacements and one was soldered with the polarity wrong.

Most had a to high DF. Two in the PSU were real bad. Powering up without an isolation transformer caused an earth leakage. The caps between earth and phase/zero turned out to be good there was no DC leakage, so there must be a leaking cap in the second filter.

This is a late 2710 and the manual is not very helpful, schematics are hard to read and the text about adjusting are for the first version. The 2712 manual is downloadable at the site of KO4BB. The procedures in there for the later model 2710 are very usefull for the 2710. For instance the way to sync the preregulator of the second switcher and adjusting the voltages.

There is a trace, it reacts on menus but the readout is unreadable (hmm, so it is now an unreadout 🙂 ). Sawtooth is OK. Charcters are written through vectors. So something seems to go wrong with the character generation or the vector writing At this moment I have a stable powersupply if I turn off the read out.

With readout the supplys wobbles about 200 mV up and down. So something is pulling the PSU down. We will see, first the netfilter. Most important thing is always first getting the PSU perfect.

Update: The netfilter should have 3 caps and a common mode choke. I measured 2 x 12 pF and 8 nF so that should mean two caps are shot.

I already noticed there was DC leakage, but two dead Y caps is not good so I placed new ones. I opened the old one and to my surprise there only was a X cap. So not according the schematic. This means the leak must be somewhere else. So I had to remove the @#$% thing again (no fun).

CRT connector mod The crt connector is made of two separate parts. The ring in the chassis and the connector. It has a bunch of wires and they are thin. It costed me 10 minutes last time to guide them so they did not get crushed by the crt pins. I now hotglued them in place. Not to much glue in case it would melt through the heat of the CRT.

Just enough to mount it with more ease. Update 8-8-13: U146, a PLS159 looks to be dead on pin 19. There is 1,75V there.

But that is low for pin 1/2 of the U204 that is behind it. Pin 13 is pulsing so output 12 should react. Even static it stayed in the wrong state. So I replaced U204. Now the squared changed into stripes. Stil no activity on the output.

Then I took a resistor and pulled pin 1/2 to ground. I expected to see some reaction on the screen like parts of characters but to my suprise I now have a perfect working read out. It looks like the display update of the read out is now a bit lagging but at least I can see error messages and read menus. After booting I got 99 errors about some files.

It asked to proceed and I said yes, then it asked to fix the file system and it did. Now it starts without a single error. Then I normalised, that took a while and only gave a frequency cal error. Not so strange because I still have no signal. The 100 MHz reference oscilator is OK, the attenuator too. Now I have to measure the first converter.

But first change all the tantalum caps. Many are a bit disformed and some show cracks, onder the microscope.

While removing one for measurement it popped and its guts came out. Others all had very high ESR and leaked to much current. Replaced some critical ones already but today the new ordered once arrived. Quick measurements on the mosfet driver show that the YIG (first LO) should have to work, at least the FM part. I can change frequency too so the main YIG looks to be OK. This is not easy, all modules are coupled with semi rigid coax through SMA and hard to reach. To be continued.

Read out working The readout is working, many tests succeed, The display was off centre. That was caused by a broken wire between horizontal position and PCB A15 J2. Now it centres well. But everything todo with frequency normalisation fails. So upto the first converter. Update: The error ‘main DAC frequency error’ and scope measurents with a HP 500-3000 MHz downconveter brought me to the YIG. It was kinda running but distorted and off frequency.

The TG worked fine, did some other tests and I followed the signal upto the 400 MHz filter. I think at this moment the problem is in the YIG or the control. I was hoping for an analog problem instead of a dead DAC so I decided to take a look at the YIG. RF motherboard The problem is this thing is tucked away rather deep. First you have to remove the RF unit. That is a lot of work and you need to be very carefull. The YIG is mounted to the unit.

A YIG is an oscillator driven by two coils. The 1st LO interface is mounted on top.

Down here you see it, it is housed in an inox cup. There are three trimmers inside. They are sealed. I’m not planning to adjust them but just in case it should be needed I drilled 3 holes in the cup. Parallel to one of the coils are two 820 uF capacitors. I desoldered them for testing because a shorted one could cause the psu instability related to the sweep.

Both had a high DF and lost about half the capacitance. Then I tested them for leakage and one of the two went well upto about 3 a 4 V and then shorted massive with a 0,5V voltdrop. So I replaced both. The new black ones are low ESR panasonics but a bit bigger. So it needed some puzzling to fit them. Next step is testing the two orange tantalums that are famous for causing problems. They have many advantages but can not handel over voltage.

And damage very easy, then nasty things like thermal runnaway can happen and they can blow up. Failure if they do not blow is forming a short. If used the right way they should be able to run for ever. Operation to remove YIG The tantalums turned out to be bad too. One was leaking to much, the other had a D of 0,4 and that is to high. Now the RF board is out I first check the filters with my vna. I bought a service manual from.

Very good quality scans voor a very fair prices. He did not have a pdf for my version but had a paper one and scanned one within a few days. Update: Removed the lid of the LF and HFVCO. Replaced a dead 74LS00. U510 on the LF board. This was giving sawtoothlike outputs and runts. Just to be shure I replaced it.

Now the signals are nice and clean. For the rest I could not find strange things. Turning C511 gives errors about beatnote when you go to low or to high. Beat is connector J540. Finally, a trace Update: Still not able to normalize and the amplitude was way to low.

In some bandwidths there was no signal at all. The problems were caused by the filters in the VR unit. There is a 500 kHz, 30 kHz and 3 kHz filter and after peaking those the amplitude is now right.

So the only problem left is the normalisation. But now amplitude is good and everything seems to work, I will first do all the alignment steps from the manual. Problem about the HFVCO is that the firmware leads you trough that. It tells you that you need to measure a voltage on a feedtrough capacitor at the bottom. But it does not tell wich one. The feedtroughs that are available do not have a relation to the vco.

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Three are used for digital and the rest is from the powersupply. But the normalisation error is related to the HFVCO. So I have to study the schematic first. Update: Finaly, frequency normalisation without errors. But still a lot to do. The log amp is not linear enough.

Tektronix User Manual

But maybe that adjustment still comes. Most important part is it does not give error messages anymore. So I leave the HFVCO as it is right now. No errors, so I have probably set it right. Update, 30-8-2012 It passed every test, all adjustments are done and it is ready for use, pfffff, what a job this was.