RF FAQ
The most likely cause is that the Q401 & Q402 pass transistors (p/n 219-3000) on the RF Amp asssembly are defective.
Tue, 8 Oct, 2019 at 2:22 PM
This indicates the APC is inhibiting the raise function. To isolate which inhibit is active, with HV applied, press the Filament "ON" and Over Loa...
Tue, 8 Oct, 2019 at 2:24 PM