I am repairing one of these sets at the moment. After going through a raft of faults getting the radio working I am about to investigate how to reconnect the clock. Yes I know the clock plugs into the chassis and switches the radio on and off but the character that worked on it has bypassed the clock and connected the mains directly to the transformer. The clock socket underneath the chassis has two terminals with leftover wire on them and the third tag is wired direct to the chassis.
I will try and prove the switch is ok and I am assuming the clock needs the active to be permanently connected and the other spare tag ( with old wire on it ) is wired to the transformer.
Have any of you worked on these before?

Clearly the clock needs permanent power otherwise it will only be right twice a day.

Normally there is a switch setup on the tick tock to to supply power to the radio and a feature to bypass, or a kill switch turn the radio off. All on the clock

Might pay to have a look at some AWA circuits s they made a few radios with clocks. I would expect all of that to be on the primary side of the transformer.

Marc

There is actually a 4th tag that looks like it had a wire on it. Probably for the buzzer.

Ok I have led you up the garden path . The model number I gave you is a 3 valve hot chassis with exactly the same chassis and case.

The model is Musiclock 55A12

Kevin Chant has the schematic. It shows the clock's plug and socket wiring.

Thanks GTC I can see it now. It looks like the active is switched on the clock socket and the neutral is in series with the socket which makes sense.

My query with this one is what powers the buzzer?

I think you'll find it's some kind of mechanical arrangement. If you hold a screwdriver close to a power transformer at just the right angle it will buzz loudly. The setup in yours could be similar, but as to what moves the metal piece close to the motor's core is something you may need to discover.

Well I have proven the switch to be ok. The only issue with the clock was it was as dry as the Simpson dessert and one of the cogs needs the correct tension on it. Other than missing the clock knobs its running ok. So why in hell disconnect the leads and wire direct to the transformer?

Why in hell would the clock start running backwards?

Why in hell would the clock start running backwards?

Synchronous motors will run in either direction depending on the location of the mains power's 50 Hz sine wave is in its cycle when the power is applied. Clocks usually have some mechanical mechanism to stop them from starting in reverse.

Microwave oven turntable motors usually don't have that mechanism and you will see them rotate in either direction.

Shaded pole motors will only start in one direction - aren't these used in clocks?

Um don't lubricate the motor I'm told after I lubricated the motor lol. The clutch! It no work!

GTC is correct. Electric clocks have synchronous motors. This is what keeps them on track all year as they lock on to the mains frequency. A sychronous motor can at times start in the wrong direction and there is a ratchet-type mechanism that causes the motor to briefly stall and then change to the correct direction.

The bushes supporting the stator should be cleaned and lubed with sewing machine oil if the bushes are dirty or binding.