2-3
2.2 Main Control PCB
The main control PCB controls the operations of all machine functions.
Jumper JP4 on the main control PCB is used for battery back-up of the SRAM. All user programmed
data and internal memory switch settings are held in SRAM. Removing JP4 will initialise the SRAM. If
the power is turned off, the battery will provide up to five years of back-up when fully charged.
Jumper JP5 on the main control PCB is used for battery back-up of the DRAM. Removing JP5 will
initialise the DRAM. If the power is turned off, the battery will provide up to 100 hours of back-up
when fully charged.
NOTE: JP4, JP5 should remain in the "ON" position at all times.
Lithium Battery Precautions:
There is a danger of an explosion if the battery is installed incorrectly. Replace the battery with the
equivalent type. Discard used batteries according to the battery manufacturer’s instructions.
OKI does not recommend the independent replacement of this battery. The battery is sold
only as a component part of the main control PCB and cannot be purchased separately from
OKI.
Il y a un danger d'explosion s'il y a un remplacement incorrect de la batterie. Remplacer
uniquement avec une batterie du même type ou d'un type recommandé par le constructeur. Mettre
au rebut les batteries usagées conformement aux instructions du fabricant.
Main control PCB block diagram
Summary of Contents for OKIOFFICE 120
Page 7: ...vi ...
Page 17: ...1 10 1 7 Dimensions Dimension in mm ...
Page 23: ...1 16 1 11 ID Label Specification 1 12 Labels location ...
Page 24: ...2 1 Section2 Machine Composition 2 1 Interconnect Block Diagram ...
Page 25: ...2 2 ...
Page 87: ...3 46 Unique Switch F 7 and F 9 Factory use only ...