Question about NorStar M7324 Telephone

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No power to cap, where's the power supply

CAP stops working, doesn't appear to need a power supply. Does it get power from the 6 wire connector

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  • NorStar Master
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Yes, a cap/klm does require a power supply. Usually the power supply is in the telephone closet and should be connected to either the orange or the green pair of the jack (depending on the wiring type). The power supply will be either a Nortel or Valcom poer supply with an output of 24vDC.

Posted on Oct 04, 2009

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  • Master
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Yes, that is a "digital" deskphone.
Unplug the phone cable for a full minute and it will reset when you plug it back in. Reset does not mean that it will erase your programming. The programming is on the main phone switch.

Posted on Sep 29, 2009

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Posted on Jan 02, 2017

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"Comment' is apparently limited - Twitter?
Anyhow, you stated: "they all metered fine, maybe 5% lower than their rating,"

Unless you have either ESR or DF capabilities and perferably a range of frequencies on your meter, you can't really assess a cap's condition.
If you have freeze spray on hand, you can influence a bad cap by cooling it below ambient and waiting for the cap to cool for a few seconds.

Electrolytics tend to go bad when exposed to high frequency components, including fast rise-times present in switched mode power supplies.

Been dealing with this problem professionally for decades.

If you find one decayed, you can lengthen its life by tacking a low-loss .22-.47 cap of equal voltage rating parallel to the electrolytic. It will then reduce exposure of the electrolytic to the damaging frequency.

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Doesnt put out power


if it stopped putting out power when in use check the circuit breakers then ope the rear cover and look for overheated wiring if it just doesn't put out power after sitting remove the small cap on the end cap and with a 9 volt battery strike battery voltage against the two terminals a couple fast times then see if it puts out power

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Try changing or testing the batteries in the remote or take the remote out of the fans range. See if this stops the flickering. It can also be the individual bulb. Sometimes the monofillament wires become loosened. It won't hurt the fan to use a broken bulb but it will shorten the life of the bulb. They do get the daylights shook out of them! If all the bulbs flicker it can be the twist connects. These are located under the ceiling plate cover. To check, shut off the fan or turn off the braker switch to make sure you don't get a shock (but I really doubt it). Remove the face plate ceiling screws to expose the wiring. There should be a black and a red cap that holds wires together. Black is ground red is power. One at a time hold the wires of the black cap with one hand and give the cap a gentle clockwise twist with your other hand to see if they need tightening. Repeat with the other colored cap. Push the wires back up inside the housing if needed and replace the cover.
These are the simpelist things to try before calling an expert. I hope this helps?

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Try swapping the power button connection with the reset button connection. Then to turn on your computer you will need to press the reset button. If that works you have a faulty power button. Otherwise try using a different PSU. One that you know works. If that doesn't help the motherboard will have to be replaced.

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2001 dodge ram 1500 5.2 v8 van spark plug diagram


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1 Answer

My Vizio VMM26F20I unit powers on, however, the display turns black after a second.IDK what to do?


In my case, problem was C504 (12pF, 3KV) on power board. Obviously damaged and discolored. The symptom was the same, initially powers on, then goes black. This cap is in the high voltage supply for the florescent back light lamp. Hardest part is separating the back case to access the power supply located in a metal shroud and taped to the LCD display backlight. No secret, just pry carefully starting at the two slots on the bottom and working around, takes a lot of effort and multiple flat blade screw drivers to work around. Once removed, carefully untape the tape at the corners of the power supply metal shroud. There are two metal shrouds, the one with four small connectors on one side with wires going to the back light is the power supply. Once loose, carefully remove the 4 connectors from the board. Then remove the 5 screws mounting the board to the metal can shroud. Then the board can be lifted to allow access to the power connector, which should be disconnected. Do not attempt to remove the connector with many wires (one red and many black), rather loosen the cable from the shroud bent metal restraining features. Now you can easily access the faulty cap, C504. Replace cap using standard desoldering and soldering principles. Assembly is in reverse order. Good luck!

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1 Answer

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1 Answer

Power capacitor


From the Legacy Manual:


The supplied charging bulb(included
in the package)is used when initially
charging the Cap. the charging process
is accomplished by connecting the
charging bulb in series between the
battery’s positive post and the
capacitor’s positive terminal.(plese
refer to the diagrambelow). it is very
important to follow this process to
eliminate the possibility of damaging
the cap/battery, and other audio
devices. The charging process is
complete when the voltage of the
capacitor reaches the same voltage
as your vehicle’s battery. This process
will take a matter of seconds to
complete. You can use a voltage meter
to check the voltage across your
battery and cup .when the voltages
are the same on both(cap and battery),
the cap has been fully charged. The
charging bulb actually eliminates the
need for the volt meter, when the cap
is fully charged (cap and battery have
same voltage) the bulb will go either
dim or fully out.

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