NTP 277-500A phase scope dead

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mcfarlane_audio

Well-known member
Joined
Jun 19, 2006
Messages
152
Location
Vancouver, BC, CA
We have got one of these at a studio i work at, hooked up to our 4k and one of the assistants plugged the connector in upside down and killed it, i have no experience in crt's and would appreciate any help someone could offer, thanks again
 
Here is the connector pinout of NTP277-500:

1 = +22 to 32V
2 = 0 V
3 = Chassis
4 = AGC OFF
5 = Screen
6,7 = balanced input left
8 = Screen
9,10 = balanced input right

As you can see from the pinout you have connected 24VDC to the right channel input. And probably burned the primary of the left channel ZFT input module transformer (designation A1 in the pcb). Check the right input with an ohmmeter (should be about 10 kohm).
 
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