I will check the schematic, since no one else seems to want to, hifiengine to the rescue again.
Okay, it is the old HA1137 chip, used in 1000's of tuners, the tuning meter is shorted out by the Selector switch when not in FM mode.
So, either
1) bad/open connections from the tuning meter to the AFC o/p on the tuner pcb
2) there is something open ckt in the AFC ckt for the HA1137. There are some caps to filter and a few R's to set the deviation, and tap off that to drive the tuning meter. There are a couple of inductors,Lg3,Lg4 in series with the tuning meter.
Open ckt between the ref bias pin 10 and the afc o/p,pin 7 on the HA1137(ICg1)
3) S1a-1R wafer is pouched, making it short out the meter all the time, check.
4) the tuning meter has gone south, you can test it out with a DMM in ohms mode to see if it deflects.
Not too much to it, good luck