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Old 11th June 2019, 05:30 PM   #41
imraneesa is offline imraneesa
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Join Date: Apr 2016
Quote:
Originally Posted by Perry Babin View Post
The timing is controlled by the resistor and capacitor on pins 5 and 6.
yes the values of the resistor and capacitor are good. resistor is 18kohms and capacitor is 1nf.
voltage on pin 4 is zero.
i removed the gate drivers as well.

going to start from scratch. but i am not getting good 50percent duty cycle.
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Old 11th June 2019, 10:38 PM   #42
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
What does "i am not getting good 50percent duty cycle" mean?
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Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.
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Old 12th June 2019, 02:44 AM   #43
imraneesa is offline imraneesa
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Join Date: Apr 2016
Quote:
Originally Posted by Perry Babin View Post
What does "i am not getting good 50percent duty cycle" mean?
First with no fets and no rectifiers. The pnp driver is getting hot. And 494 frequency is 65khz at base of pnp. I removed 2 diodes which were beside pnp. Also removed 2 diodes besides another pnp driver.
Now pnp running cool with 35khz frequency on pnp base.
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