Yes, you want to look at the 2nd IF/Audio board. CW operation is described towards the end of the text in section 2-11 of the service manual. In short the CW transmit carrier is generated by a crystal oscillator that is offset nominally 800 Hz from the dial frequency. The oscillator is keyed by Q1103 on this board.
More info on the oscillator is here:
On Sat, 1 Feb 2025 14:17:50 -0400
"Jim Harris via groups.io" <radiove1rb@...> wrote:
Hi once again. I am back trouble shooting the TR7 with what I hope is the
last problem. When I switch the mode switch to CW I get a 1800 cycle tone
in the receiver that is over S9 in strength. If you change the frequency
this tone does not change at all. I have a Version 2, 2nd I.F/Audio board.
I have not found an explanation of how the CW operation works but maybe the
problem is on that board. Anyone got any ideas? All suggestions appreciated
and welcomed.
Thank you, Jim VE1RB
--
73
-Jim
NU0C
Jim Shorney