hi,
Do you have a bench DVM.?
If yes, then connect the 0v of the DVM to the 0V rail of the pcb.
Set the DVM for 15Vdc, connect the +V of the DVM to the 9 to 4 wire.[Q0]
Press the clock push switch once [ to make it count up], note the voltage on the DVM for each switch press, it should go high and low alternately for each push.
When you do this test, sometimes when you press the count switch, hold it down, for say, for a couple of seconds. You just maybe getting a 2nd pulse on the switch release.
If you dont have a bench DVM, then use a LED with a series 1K0 resistor as the voltage/state indicator on the 9 to 5 wire.[Q0]
Where are you located.?