HP3310b - Page 1
Forum section: electronics / repair

author: pinco
author_rank: Contributor
timestamp: September 08, 2015, 12:29:41 pm
content: 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....

author: mikerj
author_rank: Super Contributor
timestamp: September 08, 2015, 01:59:15 pm
content: Have you downloaded the service manual directly fromKeysight? It's a scanned document, but the quality looks ok.

author: pinco
author_rank: Contributor
timestamp: September 08, 2015, 02:16:14 pm
content: 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.

author: pinco
author_rank: Contributor
timestamp: September 12, 2015, 09:31:09 am
content: It is a tunnel diode, one is defective 1n3713..... goodbye 3310

author: Andy Watson
author_rank: Super Contributor
timestamp: September 12, 2015, 11:33:45 am
content: Those diodes are still around, e.g. ebay 261922208194. Not cheap though!

author: Gyro
author_rank: Super Contributor
timestamp: September 12, 2015, 12:18:19 pm
content: 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_diodeshttp://w140.com/tekwiki/wiki/Russian_tunnel_diodes

author: pinco
author_rank: Contributor
timestamp: September 12, 2015, 12:27:27 pm
content: Quote from: Andy Watson on September 12, 2015, 11:33:45 amPrice is OK because no other option, but seller doesn't sent to Croatia.....

author: pinco
author_rank: Contributor
timestamp: September 12, 2015, 12:36:41 pm
content: Quote from: Gyro on September 12, 2015, 12:18:19 pmThanks!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.

author: Gyro
author_rank: Super Contributor
timestamp: September 12, 2015, 12:49:00 pm
content: 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/

author: pinco
author_rank: Contributor
timestamp: September 12, 2015, 01:30:25 pm
content: Thanks Gyro,A1 CR21 is unfortunately tunnel diode, only a replacement, the same or similar if possible.

author: GreyWoolfe
author_rank: Unknown
timestamp: September 12, 2015, 05:41:02 pm
content: 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=item25a3a8a5b1You could contact him and see if he will ship to you.

author: KJDS
author_rank: Super Contributor
timestamp: September 12, 2015, 06:16:20 pm
content: 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.

author: pinco
author_rank: Contributor
timestamp: September 12, 2015, 09:37:29 pm
content: Quote from: KJDS on September 12, 2015, 06:16:20 pmThank 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:

author: pinco
author_rank: Contributor
timestamp: September 12, 2015, 09:42:11 pm
content: Quote from: GreyWoolfe on September 12, 2015, 05:41:02 pmThanks,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.

author: KJDS
author_rank: Super Contributor
timestamp: September 14, 2015, 02:22:41 pm
content: They've both blown short on my spares unit

author: pinco
author_rank: Contributor
timestamp: September 14, 2015, 02:58:29 pm
content: Thanks for the effort.

author: Andy Watson
author_rank: Super Contributor
timestamp: September 14, 2015, 03:09:24 pm
content: Quote from: pinco on September 12, 2015, 12:27:27 pmDid you try contacting the seller directly?

author: pinco
author_rank: Contributor
timestamp: September 14, 2015, 04:09:47 pm
content: 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.

author: pinco
author_rank: Contributor
timestamp: October 03, 2015, 08:21:40 am
content: Quote from: KJDS on September 14, 2015, 02:22:41 pmI 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