Positive or negative tip: how to tell?

N

nobobo

Guest
I have an old Sanyo cassette recorder, model M 1540A. Can find no
information on what polarity of tip it uses. Only know that it's 6.0
Volt. No markings on outside of case to show what it is. Sanyo website
and customer service has no information and websearches come up empty.

I have opened the unit. It takes 4 "C" cell batteries. The circuit
board is old and isn't labeled. I can't tell how the AC adaptor jack
is wired to the board. A label on the outside says to use AC Adaptor
6CV120 or 6CV121.

I have two adaptors I am considering using with it, both positive tip.
One is a class 2 transformer that outputs 6V DC and 300mA. The other
(much bigger)is labeled AC Adaptor and outputs 6V DC and 2000mA.

Any ideas?
 
"nobobo" <questions@noboboproductions.com> wrote in message
news:1f22edbf.0412031523.19814e6e@posting.google.com...

I have opened the unit. It takes 4 "C" cell batteries. The circuit
board is old and isn't labeled. I can't tell how the AC adaptor jack
is wired to the board. A label on the outside says to use AC Adaptor
6CV120 or 6CV121.
Click to expand...
Check to see which end of the battery stack connects
to the PCB "ground" or common (generally, this will
be fairly easy to find on the PCB). The "tip" will
almost certainly be the OTHER end.

Bob M.

I have two adaptors I am considering using with it, both positive tip.
One is a class 2 transformer that outputs 6V DC and 300mA. The other
(much bigger)is labeled AC Adaptor and outputs 6V DC and 2000mA.

Any ideas?
Click to expand...
 
Mike wrote:
Don't connect the meter when set to measure ohms to a power source!
Make sure you're measuring volts instead of ohms.

Mike
Click to expand...
Read again what I wrote and do not confuse the original poster please.
Ban
 
John Fields wrote:
On Sat, 04 Dec 2004 15:25:07 GMT, "Ban" <bansuri@web.de> wrote:

Mike wrote:
Don't connect the meter when set to measure ohms to a power source!
Make sure you're measuring volts instead of ohms.

Mike

Read again what I wrote and do not confuse the original poster
please. Ban

---
It would probably have confused the original poster less (and possibly
prevented him from damaging his meter or blowing a fuse, or
whatever...) if you'd have advised him to remove the batteries before
doing any continuity testing, don't you think?
Click to expand...
How can you reach the terminal with the batteries inside? And I want to see
the guy that has working batteries in a years-old gadget?

--
ciao Ban
Bordighera, Italy
 
On Sat, 04 Dec 2004 15:52:29 GMT, "Ban" <bansuri@web.de> wrote:

John Fields wrote:
On Sat, 04 Dec 2004 15:25:07 GMT, "Ban" <bansuri@web.de> wrote:

Mike wrote:
Don't connect the meter when set to measure ohms to a power source!
Make sure you're measuring volts instead of ohms.

Mike

Read again what I wrote and do not confuse the original poster
please. Ban

---
It would probably have confused the original poster less (and possibly
prevented him from damaging his meter or blowing a fuse, or
whatever...) if you'd have advised him to remove the batteries before
doing any continuity testing, don't you think?

How can you reach the terminal with the batteries inside?
Click to expand...
---
How do you know he can't? Usually it's pretty easy, you just stick
the probe in there.
---

And I want to see the guy that has working batteries in a years-old gadget?
Click to expand...
---
See "Me-JF.tif" on abse. ;)

--
John Fields
 
nobobo wrote:
I have an old Sanyo cassette recorder, model M 1540A. Can find no
information on what polarity of tip it uses. Only know that it's 6.0
Volt. No markings on outside of case to show what it is. Sanyo website
and customer service has no information and websearches come up empty.

I have opened the unit. It takes 4 "C" cell batteries. The circuit
board is old and isn't labeled. I can't tell how the AC adaptor jack
is wired to the board. A label on the outside says to use AC Adaptor
6CV120 or 6CV121.

I have two adaptors I am considering using with it, both positive tip.
One is a class 2 transformer that outputs 6V DC and 300mA. The other
(much bigger)is labeled AC Adaptor and outputs 6V DC and 2000mA.

Any ideas?
Click to expand...
With your ohmmeter put one side to the battery negative connection and check
out which of the adaptors poles has continuity with it (possibly the
outside). Then you can insert the plug without modifications. You can then
try either supply.
--
ciao Ban
Bordighera, Italy
 
Don't connect the meter when set to measure ohms to a power source! Make
sure you're measuring volts instead of ohms.

Mike

"Ban" <bansuri@web.de> wrote in message
news:lQasd.455226$35.19704469@news4.tin.it...
nobobo wrote:
I have an old Sanyo cassette recorder, model M 1540A. Can find no
information on what polarity of tip it uses. Only know that it's 6.0
Volt. No markings on outside of case to show what it is. Sanyo website
and customer service has no information and websearches come up empty.

I have opened the unit. It takes 4 "C" cell batteries. The circuit
board is old and isn't labeled. I can't tell how the AC adaptor jack
is wired to the board. A label on the outside says to use AC Adaptor
6CV120 or 6CV121.

I have two adaptors I am considering using with it, both positive tip.
One is a class 2 transformer that outputs 6V DC and 300mA. The other
(much bigger)is labeled AC Adaptor and outputs 6V DC and 2000mA.

Any ideas?

With your ohmmeter put one side to the battery negative connection and
check
out which of the adaptors poles has continuity with it (possibly the
outside). Then you can insert the plug without modifications. You can then
try either supply.
--
ciao Ban
Bordighera, Italy
Click to expand...
 
On Sat, 04 Dec 2004 15:25:07 GMT, "Ban" <bansuri@web.de> wrote:

Mike wrote:
Don't connect the meter when set to measure ohms to a power source!
Make sure you're measuring volts instead of ohms.

Mike

Read again what I wrote and do not confuse the original poster please.
Ban
Click to expand...
---
It would probably have confused the original poster less (and possibly
prevented him from damaging his meter or blowing a fuse, or
whatever...) if you'd have advised him to remove the batteries before
doing any continuity testing, don't you think?

--
John Fields
 
Idiots, both of you.
"John Fields" <jfields@austininstruments.com> wrote in message
news:gcn3r05q125n4lt1skggp81lt6k3cnrur0@4ax.com...
On Sat, 04 Dec 2004 15:52:29 GMT, "Ban" <bansuri@web.de> wrote:

John Fields wrote:
On Sat, 04 Dec 2004 15:25:07 GMT, "Ban" <bansuri@web.de> wrote:

Mike wrote:
Don't connect the meter when set to measure ohms to a power source!
Make sure you're measuring volts instead of ohms.

Mike

Read again what I wrote and do not confuse the original poster
please. Ban

---
It would probably have confused the original poster less (and possibly
prevented him from damaging his meter or blowing a fuse, or
whatever...) if you'd have advised him to remove the batteries before
doing any continuity testing, don't you think?

How can you reach the terminal with the batteries inside?

---
How do you know he can't? Usually it's pretty easy, you just stick
the probe in there.
---

And I want to see the guy that has working batteries in a years-old
gadget?

---
See "Me-JF.tif" on abse. ;)

--
John Fields
Click to expand...
 
On Sat, 4 Dec 2004 19:57:53 -0500, "DAW" <davew@joink.com> wrote:

Idiots, both of you.
Click to expand...
---
Ha,ha, you're wrong.
Ban isn't an idiot.
---

"John Fields" <jfields@austininstruments.com> wrote in message
news:gcn3r05q125n4lt1skggp81lt6k3cnrur0@4ax.com...
On Sat, 04 Dec 2004 15:52:29 GMT, "Ban" <bansuri@web.de> wrote:

John Fields wrote:
On Sat, 04 Dec 2004 15:25:07 GMT, "Ban" <bansuri@web.de> wrote:

Mike wrote:
Don't connect the meter when set to measure ohms to a power source!
Make sure you're measuring volts instead of ohms.

Mike

Read again what I wrote and do not confuse the original poster
please. Ban

---
It would probably have confused the original poster less (and possibly
prevented him from damaging his meter or blowing a fuse, or
whatever...) if you'd have advised him to remove the batteries before
doing any continuity testing, don't you think?

How can you reach the terminal with the batteries inside?

---
How do you know he can't? Usually it's pretty easy, you just stick
the probe in there.
---

And I want to see the guy that has working batteries in a years-old
gadget?

---
See "Me-JF.tif" on abse. ;)

--
John Fields
Click to expand...
--
John Fields
 
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