This module is the receiver for both FM and UHF. I think one of mine is bad.
Here are some measurements using a Fluke 87 DMM in Ohms and Diode mode comparing a good module and a bad one.
All measurements made to ground
Bad A3 Module
Pin # Description Ohms Diode V 1 UHF Sig In infinity 2 FM Rx B+ infinity 3 UHF Rx B+ 6.4 M 2.63 4 FM Sig in infinity 5 +9n V In 14.8 k 2.28 6 10 MHz Out GND 7 AGC In 9.84 k 2.455 8 Xtal infinity 9 Xtal 473 .378 10 50 MHz Out 12.3 .011 11 200 MHz Out 53.5 .047 12 Common B+ 4.44 M 2.32 13 UHF Tx B+ infinity 14 GND 15 GND 16 GND 17 GND
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