Sound Blaster 16 CT1740 Repair \ VOGONS

Sound Blaster 16 CT1740 Repair

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First post, by fitzpatr

Posted on 2017-09-30, 03:14

fitzpatr Offline

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Hi, everyone,

I just received a CT1740 (059334) from eBay. Unfortunately, there appears to be some damage to a few components. Specifically, capacitor C15 only has two thin metal plates on the leads, and capacitor C11 is missing. I only really bought it for the removable, albeit fairly useless, CT 1748A CSP in the socket. Nevertheless, I'd like to repair this card. There are also a few exposed traces (the protecting layer is gone, bare copper is visible, but the traces appear intact.

I would appreciate some assistance from my fellow VOGONSers! What I need is:
What are the specifications of Caps C11 and C15?
What can I coat the exposed traces with to protect them?

This is the image which I'm using as reference. It is the same revision.

The attachment CT-1740 - 059334.jpg is no longer available

This is my card:

The attachment CT-1740 - 059334 - Mine.jpg is no longer available

MT-32 Old, CM-32L, CM-500, SC-55mkII, SC-88Pro, SC-D70, FB-01, MU2000EX
K6-III+/450/GA-5AX/G400 Max/Voodoo2 SLI/CT1750/MPU-401AT/Audigy 2ZS
486 Build

Reply 1 of 10, by Jo22

Posted on 2017-09-30, 11:02

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Hi, just checked the caps on my CT1740..

C11 = 4.7uF (50v)

C15 = 100uF (16v)

PS: I also attached a photograph.
Unfortunately, my cameras can't take close-up photos.

"Time, it seems, doesn't flow. For some it's fast, for some it's slow.
In what to one race is no time at all, another race can rise and fall..." - The Minstrel

//My video channel//

Reply 2 of 10, by fitzpatr

Posted on 2017-09-30, 14:27

fitzpatr Offline

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Thank you very much, Jo22. That is very helpful.

MT-32 Old, CM-32L, CM-500, SC-55mkII, SC-88Pro, SC-D70, FB-01, MU2000EX
K6-III+/450/GA-5AX/G400 Max/Voodoo2 SLI/CT1750/MPU-401AT/Audigy 2ZS
486 Build

Reply 3 of 10, by 133MHz

Posted on 2017-09-30, 21:18

133MHz Offline

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fitzpatr wrote:
What can I coat the exposed traces with to protect them?

Clear nail polish would be fine for that. 😀

http://133FSB.wordpress.com

Reply 4 of 10, by gdjacobs

Posted on 2017-10-01, 02:10

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A spray bomb of conformal coating is perfect, if you've got an electronics place near enough to you.

All hail the Great Capacitor Brand Finder

Reply 5 of 10, by fitzpatr

Posted on 2017-10-01, 02:22

fitzpatr Offline

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133MHz wrote:
fitzpatr wrote:
What can I coat the exposed traces with to protect them?

Clear nail polish would be fine for that. 😀

That was my first thought.

gdjacobs wrote:
A spray bomb of conformal coating is perfect, if you've got an electronics place near enough to you.

I will attempt to acquire some locally. Thank you for the advice.

MT-32 Old, CM-32L, CM-500, SC-55mkII, SC-88Pro, SC-D70, FB-01, MU2000EX
K6-III+/450/GA-5AX/G400 Max/Voodoo2 SLI/CT1750/MPU-401AT/Audigy 2ZS
486 Build

Reply 6 of 10, by kixs

Posted on 2017-11-19, 13:31

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It seems my CT1740 also has some problems... The volume wheel doesn't do anything. Where to start checking?

This is the card:

Any help welcome 😀

Requests here!

Reply 7 of 10, by derSammler

Posted on 2017-11-19, 14:27

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kixs wrote:
It seems my CT1740 also has some problems... The volume wheel doesn't do anything. Where to start checking?

Change the two jumpers left from the speaker jack from line out to speaker out. 😉

Reply 8 of 10, by kixs

Posted on 2017-11-19, 17:15

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Thanks! All good now 😁

Now I have to find out what is wrong with CT3910 with playing only on one channel on Speaker out, line out is fine. And with CT3670 that also plays on one channel but on both speaker and line out 🙁

Requests here!

Reply 9 of 10, by fitzpatr

Posted on 2017-11-19, 17:35

fitzpatr Offline

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Joined: 2016-10-30, 06:50
Location: Ontario, Canada

kixs wrote:
Thanks! All good now 😁

Now I have to find out what is wrong with CT3910 with playing only on one channel on Speaker out, line out is fine. And with CT3670 that also plays on one channel but on both speaker and line out 🙁

Have you gone into the mixer utility?

MT-32 Old, CM-32L, CM-500, SC-55mkII, SC-88Pro, SC-D70, FB-01, MU2000EX
K6-III+/450/GA-5AX/G400 Max/Voodoo2 SLI/CT1750/MPU-401AT/Audigy 2ZS
486 Build

Reply 10 of 10, by kixs

Posted on 2017-11-19, 19:25

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I guess it was a false alarm 😊

In this setup I had mixer set in autoexec.bat and it seems both 3670 and 3910 work fine. Noob 🤣

Requests here!

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