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Looked at a few things that are before the IC4 pin 5 keying circuit Checked diode D43 which looks to be in line with a bias resistor R164 that is on Transistor TR35.

Tested the IS1588 diode D43 both ways with the continuity tester and it showed open both ways. If this is a normal diode than leads me to believe it is failed open?

I'm not exactly sure whats going on with this keying circuit but I aim to find out <can not stand it>

[QUOTE="BBB, post: 370579, member: 23770"] Looked at a few things that are before the IC4 pin 5 keying circuit Checked diode D43 which looks to be in line with a bias resistor R164 that is on Transistor TR35. Tested the IS1588 diode D43 both ways with the continuity tester and it showed open both ways. If this is a normal diode than leads me to believe it is failed open? I'm not exactly sure whats going on with this keying circuit but I aim to find out <can not stand it> [/QUOTE]

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