1970s Zenith AM/FM/FM Stereo Clock Radio Issues

[vortalexfan]

Hello everyone, recently I had bought off of Facebook Marketplace a 1970s vintage Zenith AM/FM/FM Stereo Clock Radio Model H480W that has a few issues that need addressing to get it fully functional again.

I had one of these previously that had some similar issues (dead left channel, burned out pilot light for the FM Stereo light, &c.) and this unit has one issue that the one I had previously didn't have, and that is that the time and alarm set buttons on the back of the clock don't work, and I removed the push button panel from the back to reveal the circuit board for that and the contacts for the push-buttons themselves.

The contacts on the push-buttons had some corrosion on them, which I cleaned off and cleaned the circuitboard for the push-buttons but the push-buttons still wouldn't set the clock display.
The clock display set pushbutton circuitboard has 3 resistors and one ceramic disc capacitor on it to control the push-button PC Board.

I wonder if maybe one of those resistors or that Ceramic Disc Capacitor might be bad, and causing the clock set push-button PC Board to be dead?

Also I should mention that this clock looks like it has some moisture damage to some of the metallic parts (the chrome plated knobs and slide switch covers, and the screws were kind of rusty/corroded as well.)

Any ideas as to what might be the issue with my clock radio?

[Electronic M]

Buttons could have dirty contacts. You can try shorting the button terminals and see if it reacts.

[vortalexfan]

Originally Posted by Electronic M

Buttons could have dirty contacts. You can try shorting the button terminals and see if it reacts.

I'll give that a try.

[zeno]

Buttons were trouble so try EM's cure first.
Best to remove all & set switch cause any can go leaky.
If the clock IC plugs in clean the socket or solder it in.
Goes for all Zenth digital clocks of the era like the common R472
series.

73 Zeno
LFOD !

[vortalexfan]

Originally Posted by zeno

Buttons were trouble so try EM's cure first.
Best to remove all & set switch cause any can go leaky.
If the clock IC plugs in clean the socket or solder it in.
Goes for all Zenth digital clocks of the era like the common R472
series.

73 Zeno
LFOD !

I was wondering about that.
The circuitry for the clock (the power switch for the radio and alarm etc) all plug into the main board of the clock radio.
There is an old soldered in Ni-Cd rechargeable battery on the clock board in the clock radio used for battery back-up and I wonder if that battery might of "leaked"?

[zeno]

I would take out the battery for now & replace if you fix it.
Believe it or not my '472 kept its time last black out for about 12 hours
They used too good of a battery.

73 Zeno
LFOD !