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(Topic ID: 117326)

nugent / f4 fuse keeps blowing

By Raff

9 years ago



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  • 10 posts
  • 3 Pinsiders participating
  • Latest reply 9 years ago by JKnPA
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  • Nugent Stern Electronics, 1978

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#2 9 years ago
 
???

JKnPA

Pinside member

US Pottsville, PA

10y 37,400 648

You have to determine if the problem is on that Power supply Board or an Output.
**** POWER OFF *****
1. remove Fuse 4 and J1,J2,J3
2. Measure resistance from TP5 to Ground.
@ Low reading...... Bad Bridge Rectifier, R1,R3.
@ Good reading..... output problem ; outputs go to J1,J2,J3
* Isolate each output jack

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#4 9 years ago
 
???

JKnPA

Pinside member

US Pottsville, PA

10y 37,400 648

Do you have a schematic ?
You should read 600ohms from TP5 to ground. That is the value of the resistor.
You can check the Bridge using the Diode position on a digital meter if you have one.
Do you know how to check the Bridge?
You have to check each diode forward and back.

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#10 9 years ago
 
???

JKnPA

Pinside member

US Pottsville, PA

10y 37,400 648

Ok..... thanks for the update.
PM..... sent.

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