HP3310b

[pinco]

My name is Vinko, from Croatia. I read interesting topics of the forum for a long time.
I have HP3310B function generator, and it is broken, I need if someone have the original manual, and can scan, or take picture with camera. mobile ... only schematics. Manual on the net it is a bad scan, confusing, detail missing .... I can not deal ...
I have no signal on the out, on the out of the triangle amplifier I have the offset of -4V (TP4). And triangle on the test point TP4 is 10x higher frequency then set, and it is only 1V pp, On the output I have only distorted square of 1V max, nothing more.
My main interest is the audio electronics, HP3310 is perfect for my needs, I will be sorry if it stay broken.... 

[mikerj]

Have you downloaded the service manual directly from Keysight?  It's a scanned document, but the quality looks ok.

[pinco]

Each page has had three connected list as I understand it, I printed out everything and it is difficult to connect. Some parts of which were connected pages are missing, and I find it difficult to handle, plus l'm not really good at finding faults.

[pinco]

It is a tunnel diode, one is defective 1n3713..... goodbye 3310 

[Andy Watson]

Those diodes are still around, e.g. ebay 261922208194. Not cheap though!

[Gyro]

There are also lots of NOS Soviet military Tunnel diodes available at low cost on ebay. I think there was a thread somewhere on using them as replacements in faster Tek scopes, probably the TekScopes Yahoo forum.

It's worth the effort as the 3310 is a nice function generator when working.

Edit: Aha! These may help you...

http://w140.com/tekwiki/wiki/Tunnel_diodes
http://w140.com/tekwiki/wiki/Russian_tunnel_diodes

[pinco]

Those diodes are still around, e.g. ebay 261922208194. Not cheap though!

Price is OK because no other option, but seller doesn't  sent to Croatia.....

[pinco]

There are also lots of NOS Soviet military Tunnel diodes available at low cost on ebay. I think there was a thread somewhere on using them as replacements in faster Tek scopes, probably the TekScopes Yahoo forum.

It's worth the effort as the 3310 is a nice function generator when working.

Edit: Aha! These may help you...

http://w140.com/tekwiki/wiki/Tunnel_diodes
http://w140.com/tekwiki/wiki/Russian_tunnel_diodes

Thanks!
It would be nice if there is such information, if I could find a direct replacement, or at least on what to pay attention when choosing.
Never before had to deal with tunnel diodes.

[Gyro]

I believe that Tunnel diodes are very fragile, can be very easily damaged by heat, static(?), testing on a meter etc.

  Sorry, I had forgotten before - I captured the text from a forum on HP3310 diode repair from a forum a few years ago and put it in my test equipment folder! Please see attached. 

Edit: I just checked the manual myself - the HP3310 contains both Hot-Carrier and Tunnel Diodes. 

Just as another shot, I found this EEVblog post:

https://www.eevblog.com/forum/repair/hp-3310a-function-generator-repair/

[pinco]

Thanks Gyro,
A1 CR21 is unfortunately tunnel diode, only a replacement, the same or similar if possible.

[GreyWoolfe]

Here is a posting from a US seller:

http://www.ebay.com/itm/GE-GENERAL-ELECTRIC-NEW-NOS-NIP-1N3713-TUNNEL-DIODE-VINTAGE-SEMICONDUCTOR-DEVICE-/161659528625?hash=item25a3a8a5b1

You could contact him and see if he will ship to you.

[KJDS]

I've got a few dead 3310s, If you can post a photo of the board with an arrow to the diode I'll have a check to see if I've got some good ones.

[pinco]

I've got a few dead 3310s, If you can post a photo of the board with an arrow to the diode I'll have a check to see if I've got some good ones.

Thank you for your help and time spent searching for diodes KJDS!  I am grateful to you if you find it or not.
The diode is quite sensitive to heat, static electricity ..... should be careful when measuring with the instrument and soldering, I found it on the web.
Photos:

[pinco]

Here is a posting from a US seller:

http://www.ebay.com/itm/GE-GENERAL-ELECTRIC-NEW-NOS-NIP-1N3713-TUNNEL-DIODE-VINTAGE-SEMICONDUCTOR-DEVICE-/161659528625?hash=item25a3a8a5b1

You could contact him and see if he will ship to you.

Thanks,
But for that price would be worth more to buy a second function generator, especially if the tunnel diodes are so sensitive, there is a big risk.

[KJDS]

They've both blown short on my spares unit

[pinco]

Thanks for the effort.

[Andy Watson]

Those diodes are still around, e.g. ebay 261922208194. Not cheap though!

Price is OK because no other option, but seller doesn't  sent to Croatia.....

Did you try contacting the seller directly?

[pinco]

Yes, I just got a mail, asking £ 15 for shipping. I need to think about it, he has only one piece available and appear to be quite sensitive. It is 34$ for one diode, I hope it's just a faulty diode, nothing else.

[pinco]

They've both blown short on my spares unit

I find this, If there is no oscillation and TP4 DC voltage is high (close to or above + 5V), the problem comes from CR21 or of its circuit.
I have -4V, so CR22 is problem, diode that I thought was right one. So I made the test.

In the manual, there is procedure to check diode:



Diode that have 24-30R and work OK.



And diode that have 900R in circuit, doesn't work....



Your diodes are probably correct if they have a lower resistance, my have 24R in circuit, 30R out of,
everything is the opposite of what I thought