3–102OPERATIONS AND TIMINGCOPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)B. Power Supply CircuitryThe machine’s power supply unit uses a singlemain transformer (T101) to supply DC power.AC power is supplied to the DC power supplywhen the power switch (SW1) and the door switchare turned ON.Since DC power to the DC controller circuit willbe cut off in this condition, the machine is equippedwith a lithium battery (BAT301) to back up the RAM(Q308) in the DC controller circuit.Caution:The AC power supply unit remains suppliedwith voltage even when the power is OFF.Reference:The tolerances of the DC voltage are as follows:• +30 V +10%, -5%• +24 V ±5%• +5V ±5%However, the above stand when the AC inputinaccuracy is ±10%.Figure 3-502DS1 PWSWFU1T101DC controllerBAT301Power supply unitQ308DC Powersupplyunit+30V+24V+5VDownload service manual and resetter printer at http://printer1.blogspot.com
