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Once	again need help fixing Orion HCCA 225 Digital Reference
Once	again need help fixing Orion HCCA 225 Digital Reference
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Old 21st February 2019, 04:19 AM   #151
Chopperbuilder is offline Chopperbuilder  United States
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Join Date: May 2018
Location: St. Louis
Amp powers up for a couple of minutes when it is cold then shuts down. When it is powered up I do have voltage at the MPSA06 drivers.



When it shuts down there is no voltage on pins 9 and 10 of the 494.
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Old 21st February 2019, 05:58 AM   #152
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
Pin 4 going high will stop the IC from producing pulses on 9 and 10.

Previously, you were having a problem of having drive pulses on one set of drivers but not the other. That has nothing to do with the output of the IC. There has to be another reason for it.
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Old Today, 03:34 AM   #153
Chopperbuilder is offline Chopperbuilder  United States
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Join Date: May 2018
Location: St. Louis
I'm at a complete loss as to what could be driving the voltage up on pin 4.

Best I can tell, pin 14 drives pin 4 (attached a photo of the trace). The only things in that circuit are one electrolytic cap and one tantalum cap(see second photo). Those have both been replaced. Do you think it is possible one of those is causing it?
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Old Today, 07:08 AM   #154
Perry Babin is offline Perry Babin  United States
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Wasn't heating certain areas causing the problem to be worse?
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