Power Supply For Date/Time Display - Canon NP6045 Service Manual

As a means of protection for the power supply PCB, the AC power supply input side
is equipped with a fuse and each DC circuit is equipped with a built-in overcurrent
protection circuit.
If an overcurrent flows because of a short circuit in the power supply line, the
protection circuit will turn on to turn OFF the output of the power supply unit. If such
happens, disconnect the power plug, and remove the cause of activation; then, turn ON
the power supply. The protection circuit may be reset by turning ON the AC power supply
once again after keeping the AC power supply of the power supply unit OFF for about
30 sec.
Caution:
If an overcurrent flows, the protection circuit turns on before the fuse of the AC input
blows; however, the AC input fuse may blow if the AC power supply is turned
ON/OFF while the output of the power supply unit has a short circuit.
C. Power Supply for Date/Time Display
The DC controller PCB is equipped with a lithium battery as a backup to be used in
the event that the power plug is disconnected by accident.
The lithium battery is good for about five years with the power plug disconnected.
When its life is exhausted, the date/time notation remains unchanged; the notation
mechanism starts to operate once again when the power plug is connected.
You cannot use the lithium battery once it reaches its life, i.e., you cannot recharge
it. (Replace it with a service part battery.)
The service part battery will not discharge unless it is connected to a circuit, and it is
good as long as five years after it is first used.
Keep in mind that the backup data will be lost when the battery reaches its life or
when it is taken out for replacement; be sure to re-enter data as necessary.
Caution:
Replace the lithium battery only with the one listed in the Parts Catalog.
Use of another battery may present a risk of fire or explosion.
The battery may present a fire or chemical burn hazard if mistreated.
Do not recharge, disassemble or dispose of it in fire. Keep the battery out of reach
of children and discard any used battery promptly.
COPYRIGHT © 1997 CANON INC. CANON NP6045 REV. 1 MAR. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS
7-11