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Hello. Sorry for the late reply. Did you ever succeed in finding the problem? I have a pdf of the SL-2500 service manual and I have three SL-C9s in my collection with good power supplies (two of them fully work) so I might be able to help. On these models the clock/timer must be operational before the rest of the unit can turn on (the power button triggers the POWER CONT signal in the timer CPU and then the timer CPU operates the relay in the power supply to turn on the switched voltages). One of the most common faults with the C9 is failure of the DC-DC converter module that supplies power to the tuner and the clock display (I repaired one of those). On the 2500 there is a DC-DC converter for the clock display too but it's slightly different and less prone to failure. What happens with the US/Canadian model is the timer CPU itself fails. You can bypass the timer to allow the machine to be constantly powered on.
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