Please help a newbie repair a "hand clapper"
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From: Bjarne on 15 Sep 2007 18:56 Hi! I have a BOSS HC-2 hand clapper that is broken The problem is that it makes crackling noise when I touch the pcb. Since the audio connecters are wired to the pcb it crackles whenever the cord is touched. I have almost zero experience in repairing stuff but I want to learn, and since it's not a very expensive item, I think it makes sense to practice on it. Taking it appart it looked to me as at least of the capacitors had leaked? Could that generate crackling noise? I took this picture: http://www.bgst.dk/pcb.jpg What do I do?
From: Wolfgang Allinger on 15 Sep 2007 13:17 On 16 Sep 07 at group /sci/electronics/repair in article <no(a)no.no> (Bjarne) wrote: >I have a BOSS HC-2 hand clapper that is broken > >The problem is that it makes crackling noise when I touch the pcb. >Since the audio connecters are wired to the pcb it crackles whenever >the cord is touched. > >I have almost zero experience in repairing stuff but I want to learn, >and since it's not a very expensive item, I think it makes sense to >practice on it. Taking it appart it looked to me as at least of the >capacitors had leaked? Could that generate crackling noise? > >I took this picture: > >http://www.bgst.dk/pcb.jpg > >What do I do? I think, that's some glue (sometimes waxe) to fix parts and not caused by leaked capacitors. It's not a perfect but cheap/common method to prevent failures from vibrating parts or changing values/adjustments in some high-frequency application. I don't think, that that's your problem. Look for could solder points, bad (corroded) contacts, broken copper, cracks on the pcb... Saludos Wolfgang -- Meine 7 Sinne: Unsinn, Schwachsinn, Bl�dsinn, Wahnsinn, Stumpfsinn, Irrsinn, L�tzinn. Wolfgang Allinger Paraguay reply Adresse gesetzt ! VoIP 02173 / 99 39 209 ca. 15h00..21h00 MEZ SKYPE:wolfgang.allinger
From: William Sommerwerck on 15 Sep 2007 20:34 The solder joints on the wires look suspect. You might want to remove the solder and re-solder them.
From: Bjarne on 15 Sep 2007 20:37 thanks for the replies. Unfortunately I couldn't find any other problems. All the solder joints seems fine, and I couldn't find any cracks in the pcb. I'm suspecting that the output jack connector socket is the problem, so tomorrow I will try to solder the cord directly to the pcb, to see if I'm right.
From: hr(bob) hofmann on 15 Sep 2007 20:47
On Sep 15, 7:37 pm, Bjarne <n...(a)no.no> wrote: > thanks for the replies. Unfortunately I couldn't find any other > problems. All the solder joints seems fine, and I couldn't find any > cracks in the pcb. I'm suspecting that the output jack connector > socket is the problem, so tomorrow I will try to solder the cord > directly to the pcb, to see if I'm right. If you carefully touch each component with an insulated stick, something like a chopstick, and each wire, you should be able to find out the area of the circuit board that is most sensitive. The material in the photo looks like cheap hot glue which the manufacturer used to hold down wires that might flop loose during the final assembly. H. R. (Bob) Hofmann |