Oki OKIFAX 5400 Maintenance Manual page 272

(3) NCU board
UNC5 ------- For US and Canada
WN5 --------- For Denmark, Norway, Sweden, Finland, The Netherlands, ireland, portugal,
DN5 ---------- For Germany, Switzerland and Austria
FN5 ---------- For France and UK
• 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
(4) Power supply unit: 1VP (120V)/2VP (230V), SUB-POW board (only 230V)
• 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
(5) MEM (memory) board (Option)
• DRAM (4 Mbytes: 512 k x 8 bit x 8)
Memory storage for ECM operations, memory broadcast, delayed broadcast, etc.
(6) CTR board (Option)
• Driver circuits
(7) NTIF board (Option)
• Ringer circuit
(8) TENKEY board (Option)
• TEN-key pad
(9) HOOK board (Option)
• Hook switch circuit
(10) TELU board (Option): For US and Canada
• Speech network circuit
Basic speech functions included.
40838301TH Rev.1
New Zealand, Australia, Belgium, Spain, Greece and Other countries
A1 - 5
GENERAL