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What does RT mean on a pcb

R

rupert

Jan 1, 1970
0
hi i am a self taught repairer of basic electronic items and have been
doing it for about 4 years, as i buy faulty items repair them then
sell them on but i have a batch of about 25 PVRs i have repaired about
20 of them but there is one part on the last 4 that i need and cant
identify

It is on the power supply board

it is labelled RT1 and looks alot like a small capacitor

it has the marking 8S100L on it

it is one of the early components on the board (next after the fuse-
F1))

please help as i have repured the rest of the board but am sure that i
need to replace this aswell as it is showing scorch marks
 
J

James Sweet

Jan 1, 1970
0
rupert said:
hi i am a self taught repairer of basic electronic items and have been
doing it for about 4 years, as i buy faulty items repair them then
sell them on but i have a batch of about 25 PVRs i have repaired about
20 of them but there is one part on the last 4 that i need and cant
identify

It is on the power supply board

it is labelled RT1 and looks alot like a small capacitor

it has the marking 8S100L on it

it is one of the early components on the board (next after the fuse-
F1))

please help as i have repured the rest of the board but am sure that i
need to replace this aswell as it is showing scorch marks


Probably a MOV for surge protection.
 
E

Eeyore

Jan 1, 1970
0
rupert said:
hi i am a self taught repairer of basic electronic items and have been
doing it for about 4 years, as i buy faulty items repair them then
sell them on but i have a batch of about 25 PVRs i have repaired about
20 of them but there is one part on the last 4 that i need and cant
identify

It is on the power supply board

it is labelled RT1 and looks alot like a small capacitor

it has the marking 8S100L on it

it is one of the early components on the board (next after the fuse-
F1))

please help as i have repured the rest of the board but am sure that i
need to replace this aswell as it is showing scorch marks

It's a 'surgeguard' style NTC thermistor. Have you measured them ? They can run
quite hot btw.

Graham
 
E

Eeyore

Jan 1, 1970
0
James said:
Probably a MOV for surge protection.

They look similar to NTCs too. The MOV will be 'across the line' where an NTC
will be in series.

Graham
 
R

rupert

Jan 1, 1970
0
They look similar to NTCs too. The MOV will be 'across the line' where an NTC
will be in series.

Graham- Hide quoted text -

- Show quoted text -



hi THANKS ALOT its an NTC then but how do i find the value of the one
i need
 
R

Ross Herbert

Jan 1, 1970
0
hi i am a self taught repairer of basic electronic items and have been
doing it for about 4 years, as i buy faulty items repair them then
sell them on but i have a batch of about 25 PVRs i have repaired about
20 of them but there is one part on the last 4 that i need and cant
identify

It is on the power supply board

it is labelled RT1 and looks alot like a small capacitor

it has the marking 8S100L on it

it is one of the early components on the board (next after the fuse-
F1))

please help as i have repured the rest of the board but am sure that i
need to replace this aswell as it is showing scorch marks


Highly likely that RT means Resistor - Temperature (dependant).

It will be a NTC inrush current suppressor.. Since the unit is not
likely to be using more than a couple of 10's of watts at most you
could use one such as this

http://www.ametherm.com/Data Sheets/SL08 10001.pdf
 
E

Eeyore

Jan 1, 1970
0
rupert said:
hi THANKS ALOT its an NTC then but how do i find the value of the one
i need

Measure a good one ?

They're specced by surge capability (related to size) and hot and cold resistance.
You should be able to find a suitable replacement from that.

Graham
 
R

rupert

Jan 1, 1970
0
Measure a good one ?

They're specced by surge capability (related to size) and hot and cold resistance.
You should be able to find a suitable replacement from that.

Graham- Hide quoted text -

- Show quoted text -

THANKS FOR YOUR REPLIES I GET SOME ON ORDER!!!
 
R

Ross Herbert

Jan 1, 1970
0
Could this device (or similar) be put in series with my halogen puck
lights that keep blowing bulbs - and would it help?


Could you please explain what a "puck light" is?

I am familiar with the standard halogen downlights operating from ac
mains supply via a transformer but not knowing the specifics of your
particular halogen I couldn't say whether the NTC would help.
 
U

Usual Suspect

Jan 1, 1970
0
it is labelled RT1 and looks alot like a small capacitor

Is it a microprocessor PCB? Does it say "RTS"?

"Return to sender, address unknown".

But that's just a guess...
 
J

James Sweet

Jan 1, 1970
0
Could you please explain what a "puck light" is?

I am familiar with the standard halogen downlights operating from ac
mains supply via a transformer but not knowing the specifics of your
particular halogen I couldn't say whether the NTC would help.

I would guess he means the hockey puck shaped halogen fixtures meant for
mounting under kitchen cabinets.
 
J

Jim Land

Jan 1, 1970
0
[email protected] wrote in
my halogen puck
lights that keep blowing bulbs

When that happens, start by taking an accurate voltmeter and measuring the
AC voltage on the lamps. If it's too high, of course they will keep
blowing.

What about other light bulbs? Do they keep blowing too? What is the
voltage at an outlet?
 
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