On these Sanyos a dead tuner is usually no 33 volts to the tuner.
Its an open resistor. IIRC a 33K 1 or 2 watt. You can measure the
voltages under the tuner. Been years but look for the following.
IF output ?V
AGC ?V
33V 33V
5V 5V
9V or 12V 9V or 12V
Data depends on activity
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If the manual looks the same you can usually use it for most things.
Tuners are trouble also especially the IC that handles tuning
voltage & band switching.
Good luck
Zeno
LFOD !