WorkCentre 3210/3220 Multifunction Printer Service Manual 2-31
Theory of Operation
Line Interface
Line Interface is connection part between system and PSTN (Public Switched
Telephone Network), and primary circuit is usually located. The main
functions are Line Interface, Telephone Connection, and Line Condition
Monitoring.
Telephone Line Connection
1. Modular Plug: RJ-11C
2. LIU PBA Modular Type: 623 PCB4-4
3. Line Code Length: 2500 mm ± 50 mm
4. Line Code Color: Black
On HOOK State Characteristic
1. DC Resistance
■ DP Dial Mode (Direct Current 30 mA): 50~300 Ohm
■ DTMF Dial Mode (Direct Current 20 mA): 50~540 Ohm
2. Ring Sensitivity
a. Ring Detection Voltage: 40 Vrms~150 Vrms
(condition: Current = 25 mA, Frequency =15 Hz)
product Margin: 30 Vrms~150 Vrms
b. Ring Detection Frequency: 15.3 Hz~68 Hz
(condition: Voltage = 45 Vrms, Current = 25 mA)
product Margin: 15 Hz~70 Hz
c. Ring Detection Current: 20 mA ~ 100 mA
(condition: Voltage = 40 Vrms, Frequency = 20 Hz)
product Margin: over 15 mA
3. False Ring Sound
a. Ring Frequency: 750 Hz + 1020 Hz
b. Ring Interrupt Cycle: On/Off depending on input Ring Signal Cycle.
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