Have a pc 770 that is dead, when arrived found front clamshell tension springs had blown out through the bottam and wedged into paper tray, got that taken care of ran 2 copies, copy quality not good, cleaned machine inside and out and when turned macine back on, no power ?
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Check the door switch >>>>
The machine’s power supply consists of a composite power supply circuit in which a DC power supply, scanning lamp power supply, and high-voltage power supply are integrated on a
single board. It also possesses a microprocessor for exchanges of various data with the machine's DC controller PCB.
The machine’s power switch is a soft switch, and the machine is equipped with an auxiliary power supply used to operate the switch. The auxiliary power supply provides the microprocessor
(Q900) with +5 V as long as the door switch (DS1) remains on.
AC power is supplied to the DC power supply when the power switch on the control panel is turned on. In response, the DC power supply provides the DC controller PCB with +5 V, +24 VR, and +24 VU.
check machine circuit breaker/ check ac in/ac out past breaker
Power plug
Covers
Power source
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Checks
Is the power plug connected to the
power outlet?
Are the front door and delivery cover
closed fully?
Is the rated voltage found at the power
outlet?
Is the rated voltage present between J1- 1 and -2? (J1 is found near the power cord mount.)
J109-1 (+) ..... Connect the positive probe.
J109-2 (-) ...... Connect the negative probe.
Last edited by teckat; 04-16-2011, 05:47 PM.**Knowledge is time consuming, exhausting and costly for a trained Tech.**
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Thanks very much for getting back to me so quickly, I just looked at it, I removed cover over rear interlock switch, then removed the silver cardboard sheild, didn't actually see a breaker but must have been something loose because it then started working ! Is going fine now, thanks again, Mick CComment
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