Ncu Board (Unc5); Power Supply Unit; Memory Board (Option); Ctr Board (Pc Interface) - Oki OKIOFFICE44 Service Manual

NCU Board (UNC5)

• Conversion of receive data and receive signals to internal signal level
• Conversion of send data and send signals to external signal level
• Generation of dial pulses to telephone line
• Detection of ringing signal
• Detection of busy tone (conjunction with Modem unit)
• Detection of hook up signal
• Interface with telephone handset (option)
• Output of send data and send signals to telephone line
• Input of receive data and receive signals from telephone line

Power Supply Unit

048-POW (120V/230V), TLHV/OLHV Board for OKIOFFICE44
• Conversion of main alternating current to the following direct currents:
+5V DC power supply
+8V DC/-8V DC power supply
+30V DC power supply
• Supplying of main alternating current to fuser unit
• Generation of medium voltages +300V, -300V, +400V, -450V and 0V
• Generation of high voltages -1.35 kV, -0.75 kV and +3.5 kV

Memory Board (Option)

• Memory storage for ECM operations, memory broadcast, delayed broadcast, etc.

CTR Board (PC Interface)

• Driver circuits

HOOK Board (Option)

• Hook switch circuit

TELU Board (Option)

This is contained within the optional handset.
• Speech network circuit
Basic speech functions included.
Board Descriptions A - 7
Service Manual, P/N 59276801
OKIOFFICE 44