Philips AZ3142 schematic

[Wayne Tiffany]

Does anyone have the schematic for this sitting around?

This is the wife's little pumpkin boombox and she complained about the
volume not being as high as it used to be, pretty much across the board for
AM, FM, CD, tape. So I figured the most likely was electrolytics in the
power supply. Checked there, found higher esr on many than what I figured
was normal, and ordered replacements. Once I got started replacing them, I
found that one was not polarized, no markings on the board nor on the cap,
so I didn't change it.

Put it back together expecting the volume to be fine, but instead finding
that I now don't even have control of much of anything. The CD player
display is not active, etc. I don't remember the rest of the specifics
because it's been sitting on my workbench for about 4 weeks, but I will get
back into it if anyone has suggestions. During the cap changouts I did
unsolder the unpolarized one, but put it back the way it was. I also
rechecked all the wiring and connectors about 5 times as that seemed to be
the most likey suspect. I compared it to the pics I shot as I disassembled.
Thoughts?

WT

 

[William Sommerwerck]

Have you put back all the original caps, in their original positions?

It's possible you screwed up something else when replacing the caps (I've
done it often enough), and you need to eliminate that possibility.

 

[Wayne Tiffany]

No I did not replace all the original caps as I double checked what I had on
the board to my annotated picture that I printed to make sure I knew what
was what. I'm not even sure I still have the originals as they were not
what I considered good. Probably tossed them....

WT

"William Sommerwerck" <grizzledgeezer@comcast.net> wrote in message
news:ghjq6j$uce$1@news.motzarella.org...

Have you put back all the original caps, in their original positions?

It's possible you screwed up something else when replacing the caps (I've
done it often enough), and you need to eliminate that possibility.

 

[bz]

"Wayne Tiffany" <wayneRMVJNKtiffany@MOREJNKasi.com> wrote in
news:493d6fd2$1@news.x-privat.org:

No I did not replace all the original caps as I double checked what I
had on the board to my annotated picture that I printed to make sure I
knew what was what. I'm not even sure I still have the originals as
they were not what I considered good. Probably tossed them....

WT

"William Sommerwerck" <grizzledgeezer@comcast.net> wrote in message
news:ghjq6j$uce$1@news.motzarella.org...
Have you put back all the original caps, in their original positions?

It's possible you screwed up something else when replacing the caps
(I've done it often enough), and you need to eliminate that
possibility.

Possibilities:
1) defective replacement part(s). New parts are sometimes bad.
2) another, unrelated part failed while you were working on it.
3) solder bridge, broken trace, bad solder connection.
4) mistake in reading part value on the original part.
5) broken connecting wire.
6) you may have misconnected something.

Since you seem to be saying that pretty much everything is screwy, I would
start by checking power busses and grounds. A missing ground can cause all
kinds of strange things to happen.









--
bz 73 de N5BZ k

please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
infinite set.

bz+ser@ch100-5.chem.lsu.edu remove ch100-5 to avoid spam trap