Help identifying components - Page 1
Forum section: electronics / beginners

author: ellisd1984
author_rank: Newbie
timestamp: September 03, 2022, 06:24:04 am
content: Hi, I'm a complete beginner so this is probably ridiculously simple to someone in the know.I've spilt some water on a cd player and it stopped working correctly. I've managed to trace the fault back to a small pcb. From what I can tell the only components other the connectors are two capacitors. Can someone help me source suitable replacements?Thanks everyone in advance

author: ataradov
author_rank: Super Contributor
timestamp: September 03, 2022, 06:50:16 am
content: How exactly did you trace the fault? Chances of them being damaged are pretty minimal.

author: ellisd1984
author_rank: Newbie
timestamp: September 03, 2022, 06:55:24 am
content: Hi, the part is from a technics cdj player. I had an undamaged player available and swapped components till the fault disappeared so pretty confident in the diagnosis.

author: ataradov
author_rank: Super Contributor
timestamp: September 03, 2022, 06:58:16 am
content: In that case I would be looking at damaged/corroded tracks and pins of the connectors.The capacitors value is encoded with the color of the bands and your picture is not clear enough. You can use tables like this to decode themhttps://www.electronics-tutorials.ws/capacitor/cap_5.html

author: ellisd1984
author_rank: Newbie
timestamp: September 03, 2022, 07:23:46 am
content: Thanks for the link, I'm going to be honest I'm struggling getting the right value, it's going over my head a bit. Would it be 10nf by chance

author: ellisd1984
author_rank: Newbie
timestamp: September 03, 2022, 07:25:35 am
content: The pcb itself looks to be in good condition. I'm going to give it a good clean with iso alcohol through, just in case.

author: gamalot
author_rank: Super Contributor
timestamp: September 03, 2022, 07:36:12 am
content: Quote from: ellisd1984 on September 03, 2022, 07:23:46 amTo me they look like brown, black, yellow and the capacitance value should be 100nF.

author: ataradov
author_rank: Super Contributor
timestamp: September 03, 2022, 07:37:36 am
content: This looks like 100 nF (0.1 uF) capacitor. But again, chances that they are at fault are negligible. But if you suspect them, try removing them first.

author: ataradov
author_rank: Super Contributor
timestamp: September 03, 2022, 07:38:15 am
content: You have one trace broken. Look near pin 1 of CN3408. Or at least it looks broken.

author: ellisd1984
author_rank: Newbie
timestamp: September 03, 2022, 07:39:26 am
content: The component itself is yellow the final strip I'd say is orange, I can't tell if there's meany to 3 trips or 4 (one being yellow). Sorry I know this is a complete noob issue

author: ataradov
author_rank: Super Contributor
timestamp: September 03, 2022, 07:41:10 am
content: The values that make most sense are brown, black, yellow, making it 100 nF capacitor - a very generic decoupling capacitor value.

author: ellisd1984
author_rank: Newbie
timestamp: September 03, 2022, 07:52:22 am
content: Thanks for thatI've double checked the traces and I think it was just a bad photo. I've check for continuity and there's no break.

author: ataradov
author_rank: Super Contributor
timestamp: September 03, 2022, 07:57:10 am
content: Yes, this looks fine. Also check connector pins, see if they have signs of damage. This board looks very clean.

author: ellisd1984
author_rank: Newbie
timestamp: September 03, 2022, 08:42:41 am
content: I've managed to find the service manual for the unit and it states it's 0.1uf so yes 100nf 50v so I presume any capcitor with these values will be suitable. I found a place selling the exact part number capacitor but it was going to cost over £40 which I don't see the point.Thanks for everyones help. I've had forums before where you're looked down on because you don't know the basics

author: ellisd1984
author_rank: Newbie
timestamp: September 03, 2022, 08:44:14 am
content: ..

author: ataradov
author_rank: Super Contributor
timestamp: September 03, 2022, 04:30:39 pm
content: Yes, any replacements would work. But the only way those capacitors would affect anything is if they are shorted. If you have a multimeter, measure resistance across them. If they are shorted, simply removing them would be a viable temporary solution.