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Board Descriptions
A - 52
OKIOFFICE 44 Serv. Man., P/N 59276801
4.
Description of the NCU Block Diagram
4.1
UNC circuit diagram
1
Lightning arresters (AR1, 2)
The nominal operating voltage is 350 V.
When connecting the ground of the arrestor to the chassis, tighten ARG on the PCB with a
screw. At this time, the PCB is grounded through the power cable.
The TB1 arrestor ground terminal can also be used to connect to the earth directly.
4
DC circuits (R10, R11, C4)
These circuits provide DC characteristics according to the line requirements using the primary
DC resistor in the line transformer T1 and the R10 and R11 resistors . The capacitor C4 by-
passes AC signals.
5
Impedance matching network (R523, R536, C503)
This circuit matches the impedance between the line and equipment to reduce reflection of
transmitted signals.
6
Receiving sensitivity (R574, R504)
The receiving sensitivity at line seizuring is determined by R574 and the MF tone receiving
sensitivity at parallel pickup is determined by R504.
7
CML (RL1)
This circuit selectively switches the line between the telephone or facsimile.
8
SR (RL2)
This circuit connects the line with the telephone. During facsimile transmission, it disconnects
the telephone.
11
PP (RL6)
If this circuits detects MF or CNG tones without seizuring a line, it sets a proper receiving
sensitivity.
12
DP (RL3)
This circuit generates pulse dials.
If the circuit detects MF or CNG tones without seizuring a line, it opens to increase the imped-
ance.
13
Pickup RC (R5, C31)
These circuits insert a high-impedance resistor and capacitor serially to prevent the line imped-
ance from dropping by the line transformer T1.
14
Ring detectors (IC1)
These circuits detect a ring signal arriving to the line. If the input ring signal exceeds a specific
voltage, the circuits output a signal having of RI the same frequency as incoming RI.
15
Line transformer (T1)
This circuit processes send/receive signals required for facsimile transmission, dial tone receive
signals required for automatic dialing, and MF tone send and remote receive signals. It sepa-
rates between the line and equipment in terms of DC and also keeps a balance between the line
and the ground. The transformer on the UNC board for OKIFAX 5600 is covered with the
shield case for the low-level receiving countermeasure.
16
Off-hook detector (IC2)
This circuit detects the off-hook state of the telephone connected to the TEL1, TEL2 through
LINE terminals.
Содержание OKIOFFICE 44
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Страница 325: ...Illustrated Parts List D 2 OKIOFFICE 44 Service Manual P N 59276801 54 Section 1 Cabinet Assembly 1 2...
Страница 327: ...Illustrated Parts List D 4 OKIOFFICE 44 Service Manual P N 59276801 54 Section 1 Cabinet Assembly 2 2...
Страница 329: ...Illustrated Parts List D 6 OKIOFFICE 44 Service Manual P N 59276801 Section 2 Printer Unit...
Страница 331: ...Illustrated Parts List D 8 OKIOFFICE 44 Service Manual P N 59276801 Section 3 Operator Panel...
Страница 333: ...Illustrated Parts List D 10 OKIOFFICE 44 Service Manual P N 59276801 Section 4 Operator Panel Assembly...
Страница 335: ...Illustrated Parts List D 12 OKIOFFICE 44 Service Manual P N 59276801 Section 5 Frame Assembly Scanner L...
Страница 337: ...Illustrated Parts List D 14 OKIOFFICE 44 Service Manual P N 59276801 Section 6 Plate Assembly Scanner B...
Страница 339: ...Illustrated Parts List D 16 OKIOFFICE 44 Service Manual P N 59276801 Section 7 Plate Assembly Scanner R...
Страница 341: ...Illustrated Parts List D 18 OKIOFFICE 44 Service Manual P N 59276801 Section 8 Frame Assembly Scanner U...
Страница 343: ...Illustrated Parts List D 20 OKIOFFICE 44 Service Manual P N 59276801 Section 9 Cover Assembly Top...
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Страница 351: ...Illustrated Parts List D 28 OKIOFFICE 44 Service Manual P N 59276801 Section 12 Cables...
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Страница 357: ...Board Layout E 2 OKIOFFICE 44 Service Manual P N 59276801 MEM eps E 2 MEM PCB...
Страница 358: ...Board Layout E 3 OKIOFFICE 44 Service Manual P N 59276801 TEL U eps E 3 TEL U PCB...
Страница 359: ...Board Layout E 4 OKIOFFICE 44 Service Manual P N 59276801 Hook eps E 4 Hook PCB...
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Страница 388: ...OKIOFFICE 44 Service Manual Part Number 59276801 Printed in the USA...