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CTS1200 Problem


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#1 Fspatola

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Posted 28 July 2014 - 07:27 AM

Can some please help, I am working on a CTS1200 that had 2 shorted outputs. I replaced all 3 on the same heat sink as well as .68 ohm resistors associated with those drivers. I do not have any more shorts In that channel now. My problem is when I measure the resistance across the base & emitter of the output drivers I get about 34 ohms on all except the 2 that were shorted it is a lot higher. Any ideas on what I should look for. Please help.
Thank You, Frank..

#2 joust

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Posted 28 July 2014 - 02:20 PM

Hello Frank, I hope you are well!

There is a possible open 33 ohms (!) driver resistance, R347 (positive side) and/or R362 (negative side) (!) in the pertinent channel. These resistors are for Ch1; Also, verify R447 and R462 for Ch2. Since the resitstor has openned, verify the driver also!

Alain

#3 Fspatola

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Posted 03 August 2014 - 01:18 PM

As always Alain. You are correct. R462 was open. Thank You for your help.
Frank.

#4 joust

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Posted 05 August 2014 - 09:06 AM

Hello Frank,

That was an easy question! :)  Next time I hope you'll have a more challenging request! :D

Very best regards, my dear Frank. Keep the health!

A.