Siglent SDG 1025 schematic diagram (or what is the U63 chip) - Page 1
Forum section: electronics / repair

author: struijs
author_rank: Contributor
timestamp: September 09, 2018, 09:31:08 pm
content: Hi guys.I am looking for the schematic diagram for the Siglent SDG 1025.Or, does anybody knows what kind of IC the U63 is? The letters on top does not give a hit on Google.Thanks in advance, Peter

author: tautech
author_rank: Super Contributor
timestamp: September 09, 2018, 10:05:13 pm
content: Quote from: struijs on September 09, 2018, 09:31:08 pmWelcome to the forum.Have a look and follow links here:https://www.eevblog.com/forum/testgear/the-sdg1000-and-sdg800-thread/

author: tautech
author_rank: Super Contributor
timestamp: September 10, 2018, 08:12:22 am
content: Here's a teardown thread of the SDG1010 that shows the same HW as SDG1025:https://www.eevblog.com/forum/reviews/siglent-sdg1010-function-generator-teardown/But where's U63 ?Can you post a pic of your PCB ?

author: struijs
author_rank: Contributor
timestamp: September 10, 2018, 06:26:11 pm
content: It is the IC close to the crystal.Thanks for your topic link. But i can't find a schematic there.Peter

author: struijs
author_rank: Contributor
timestamp: September 10, 2018, 06:30:29 pm
content: This is the IC. Really no idea what it is.

author: PA0PBZ
author_rank: Super Contributor
timestamp: September 10, 2018, 06:41:35 pm
content: Can you maybe post a picture where we can actually read what is on the ic?

author: tautech
author_rank: Super Contributor
timestamp: September 10, 2018, 08:57:24 pm
content: There's some more pics here but sadly none of the region of interest:https://www.eevblog.com/forum/testgear/siglent-sdg1025-arbitraryfunction-generator-under-some-tests/msg129024/#msg129024

author: commongrounder
author_rank: Frequent Contributor
timestamp: September 10, 2018, 09:18:01 pm
content: I took a peek inside my SDG1005. It looks like U63 is a HC14, a hex schmidt trigger logic chip.

author: struijs
author_rank: Contributor
timestamp: September 12, 2018, 11:55:36 am
content: You are my hero!Are there different versions of a HC14 or just one size fits all?Thanks again.Peter

author: struijs
author_rank: Contributor
timestamp: September 12, 2018, 12:03:18 pm
content: With a little help from photoshop to enhance the letters.

author: struijs
author_rank: Contributor
timestamp: September 12, 2018, 12:05:33 pm
content: It looks i have a HA14 or so.Can you tell me exact whats written on yours please. All the letters.Thanks for opening your device. Great service.Peter

author: struijs
author_rank: Contributor
timestamp: September 12, 2018, 03:13:11 pm
content: We are close guys. I have a better picture now.commongrounder has a HC14, mine looks really like a HA14. Is there any difference?And any idea where i can buy that HA14? Google is not my best friend in this.I am from the netherlands.

author: commongrounder
author_rank: Frequent Contributor
timestamp: September 12, 2018, 03:14:18 pm
content: HA14 and HC14 are both hex schmitt-trigger inverters. They have slightly different cmos characteristics, but function identically in most circuits. I’m guessing, due to this part’s proximity to the crystal, it functions as part of the 10Mhz time base oscillator. The other numbers on the chip are manufacturing and date codes, and will vary on a replacement part.What specific problem are you having that has you looking at this chip?

author: struijs
author_rank: Contributor
timestamp: September 12, 2018, 03:19:42 pm
content: Quote from: commongrounder on September 12, 2018, 03:14:18 pmI broke some legs. Don't ask me how....So looking for a new one. You help me really a lot.Now i have to find a reseller.

author: PA0PBZ
author_rank: Super Contributor
timestamp: September 12, 2018, 06:07:14 pm
content: First find out what the package is:http://www.ti.com/pdfs/logic/qfncompare.pdfThen you know what you need to order:Part Marking PackageSN74AHC14DBR HA14 SSOP-14SN74AHC14DGVR HA14 TVSOP-14SN74AHC14PW HA14 TSSOP-14

author: struijs
author_rank: Contributor
timestamp: September 12, 2018, 07:19:24 pm
content: Quote from: PA0PBZ on September 12, 2018, 06:07:14 pmTSSOP i think, its a 14 pin.

author: tautech
author_rank: Super Contributor
timestamp: September 12, 2018, 07:30:01 pm
content: Quote from: struijs on September 12, 2018, 07:19:24 pmThey are all 14 pin, check the package type by comparing all measurements.

author: struijs
author_rank: Contributor
timestamp: September 12, 2018, 07:50:12 pm
content: Quote from: PA0PBZ on September 12, 2018, 06:07:14 pmThank you. i ordered 20 (!!!!) at RS-components. Lucky me they were cheap. So if anybody need 19..... :-)PeterFingers crossed.

author: struijs
author_rank: Contributor
timestamp: September 12, 2018, 07:51:44 pm
content: Quote from: tautech on September 12, 2018, 07:30:01 pmYes, my fault. Thank you guys that you help me so much.Mine was exact 5mm, so its the TSSOPPeter

author: JohnPi
author_rank: Regular Contributor
timestamp: September 13, 2018, 01:32:30 pm
content: While you have it open, you could upgrade the oscillator to a TCXO:https://www.eevblog.com/forum/repair/siglent-sdg1025-ribbon-cable-connector/msg1721600/#msg1721600

author: struijs
author_rank: Contributor
timestamp: September 14, 2018, 07:49:58 pm
content: Hi Guys,Thank you very much for all who helped.I bought the HA14 IC and did some micro soldering.The unit is working fine again including the TCXO modification.Thanks again, Peter