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Re: Smoke coming from PAS16

Posted on 11 minutes ago

Please check whether both VA and VD actually reach 5V with the CS4216 still removed. You can do this by injecting 5V into the ISA 5V contacts as you already did when you found that the CS4216 got too hot, no need to test that in system. VD is 4.96v and VA is 2.2v I'd also like to point out that the …

Re: Smoke coming from PAS16

Posted on 30 minutes ago

Some acetone should quickly tell us if the chip is fake or not, quick dab of acetone on the IC markings and wipe it off. If the markings stay and dont get removed or faded then its a good chance the IC is real, would still need some testing to verify its working though. They passed the acetone test …

Re: Smoke coming from PAS16

Posted on 31 minutes ago

If I'm unsure whether a chip might be fake, I like to plausibilize the chip by testing the ESD diodes in them: Use a meter in diode test mode, red lead to the appropriate ground connection, black lead to a signal pin. On many pins, you will get a reading betwenn 0.3 and .7 volts. Pins with similar …

Re: Smoke coming from PAS16

Posted on 38 minutes ago

Looking at the PCB photo, I see all of these pins connecting somewhere using wide traces . This is a hint that these pins are intended to be connected directly to GND or Vcc. It is common to use wider traces for power rails, and just make every trace wide that is connected to a power rail. Taking a …

Re: Smoke coming from PAS16

Posted on 39 minutes ago

It does sound like the chip is operating in the wrong mode, with one or more of the multi-function pins operating as outputs when they're intended to be input only. But that's probably just a symptom of VCC being almost shorted to GND; I'd say there's still more bad caps to be found. That is true. …

Re: Smoke coming from PAS16

Posted on Yesterday, 00:40

A pin shorted to ground or Vcc. Prime candidates are pins that are supposed to be powered by the CS4216, like SDOUT or the but also the REFBYP/REFBUF pins of the voltage reference. A supply pin not connected to Vcc/GND while it should. This can cause the internal biasing of transistors to be wrong. …

Re: Smoke coming from PAS16

Posted on 2024-05-18, 11:47

Going to have a look at the crystal pins to make sure I haven’t shorted any of them. Be aware that the pinout you show is for the TQFP version of that chip, but you installed the PLCC version of that chip on your sound card. Installing the PLCC version was the correct thing to do, because the card …

Re: Smoke coming from PAS16

Posted on 2024-05-18, 09:52

Did some voltage injection on the 5v line. The only thing getting hot is the Crystal CS4216-KL. Reaching about 60c on 5v and 0.97 amps. Going to have a look at the crystal pins to make sure I haven’t shorted any of them. 9384A134-25B5-4733-A081-FD1B86DC60BE.jpeg Not sure what else to check after …

Re: Smoke coming from PAS16

Posted on 2024-05-18, 06:30

I finally had some time to continue with this. thumbnail_IMG_5196222.png C96 (ceramic capacitor) and CT13 (tantalum capacitor) appeared to be shorted so I removed and tested both of them. However, both capacitors tested fine. thumbnail_IMG_5194.jpg thumbnail_IMG_5193.jpg I then replaced the MVA416 …

Re: Roland CM-32L ROM Version?

Posted on 2024-05-15, 08:57

keropi wrote on 2024-05-13, 09:08: ah I missed the part where you don't have the unit yet 😁 pretty sure it will not be 1.00 so you'll be lucky! CM-32L arrived today. TAKEGO.MID plays perfectly, no clicking sound. So it’s a v1.02 ROM. Very happy! Filename D4F0142A-52C4-4771-A7F4-416AAED1A4F3.jpeg …

Re: Roland CM-32L ROM Version?

Posted on 2024-05-13, 08:31

why not just use TAKEGO.MID to be 100% sure? if you have v1.00 rom you will immediately hear it - there is no mistaking I wish I could. I don’t have physical access to the device. I was trying to determine the version prior to purchase 😝 it’s a bit of a gamble but if it does turn out to be v1.00 …

Re: Roland CM-32L ROM Version?

Posted on 2024-05-13, 06:20

I found a website that allows you to lookup Roland serial numbers to give you a date of manufacture. This one was end of 1991. Since the CM-32L started production 1989 I think it’s safe to say a 1991 model was not running v1.00 https://serial-number-decoder.co.uk/roland/roland.htm

Roland CM-32L ROM Version?

Posted on 2024-05-12, 10:59

I’m trying to determine if the ROM version for a CM-32L is v1.00 or not Is it safe to assume that because the ROM is soldered directly to the PCB it is NOT v1.00? Where as the v1.00 version has a socket? One of Phil’s videos seem to suggest this. What’s interesting is that it’s serial number starts …

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