Note 1:
This procedure may be omitted depending on the dial parameters.
Note 2:
MF (Multi-frequency) tone is generated by the modem and transferred to the telephone line via the NCU
board.
3. Explanation of CN3 Terminals
CN3 pin No.
Terminal name
Explanation
UNC
(US, CA)
1
REV2
Detection and output of the direction of DC line
current.
*
2
OH2
Detection of off-book of terminal connected to
TEL-1 or TEL-2.
3
OH1
Output upon circuit current detection after fax line
seizure.
*
4
RI
0 - 5 V signal output synchronized with the ringing
signal frequency.
5
NC
Unused terminal.
*
6
PP
Relay control signal for special service code
detection at parallel pickup or remote reception
7, 8
E
GNC
9, 10
sub +5 V
Sub power supply for OH2 and RI detection
11, 12
+ 5 V
Power supply for relays and logic circuits
13, 14
+ 5 V A
=% V power supply for analog circuit
*
15, 16
S
TX Signal
17, 18
- 5 VA
- 5 V power supply for analog circuit
*
19, 20
R
RX Signal
21, 22
SG
Signal ground
23, 24
Rp
Receiving sensitivity determination terminal
25
DP
Pulse dial control signal
26
CML
Line seizure control signal
27
F, ICC
Loop current control signal upon line seizure
*
28
SR
Control signal for connection between LINE and
TEL terminals.
29
PBXE
Control signal for connecting one of LINE terminal
to the PBXE terminal
*
30
MUTE
Control signal for pulse dial improvement and bell
shunt relay.
*
4. Description on 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 bypasses 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.
Содержание OKIOFFICE 84
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Страница 51: ...Page 33 Service Guide OKIOFFICE 84 Chapter 1 General Information Telephone Directory Example Example 1 of 3 ...
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Страница 53: ... Example 2 of 3 Example 3 of 3 ...
Страница 55: ...Page 34 Service Guide OKIOFFICE 84 Chapter 1 General Information Configuration Report User ...
Страница 56: ... 1 Function 21 is printed out when the MFP Operation ON OFF setting is set to ON from HOST to MFP ...
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Страница 64: ...Note ...
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Страница 172: ...Note Use the UNIQUE key to input special symbols ...
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Страница 182: ...Page 98 Service Guide OKIOFFICE 84 Chapter 2 Installation Self Diagnosis Print Test Example ...
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Страница 197: ...Page 109 Service Guide OKIOFFICE 84 Chapter 4 Disassembly Disassembly Procedure Flow Figure 4 3 1 2 ...
Страница 198: ...Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner ...
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Страница 200: ...Page 110 Service Guide OKIOFFICE 84 Chapter 4 Disassembly Disassembly Procedure Flow Figure 4 3 2 2 ...
Страница 206: ...d First move the center of Guide paper L and R of Holder assembly and then open the Cover Main from the rear side ...
Страница 219: ...Page 118 Service Guide OKIOFFICE 84 Chapter 4 Disassembly 4 3 7 Printer Unit Section Base Frame Unit ...
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Страница 254: ...Note DRUM T will be used to know the total in use life of the machine ...
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Страница 311: ...Page 175 Service Guide OKIOFFICE 84 Chapter 7 Troubleshooting 7 13 High Speed Modem Test ...
Страница 313: ...Page 176 Service Guide OKIOFFICE 84 Chapter 7 Troubleshooting 7 14 MF Send Test ...
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Страница 348: ...Page 200 Service Guide OKIOFFICE 84 Chapter 7 Troubleshooting 11 Evenly Spaced Marks on Output ...
Страница 349: ...Copyright 1998 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner ...
Страница 350: ...Exchange BPX for any updates to this material http bpx okidata com ...
Страница 352: ...Page 202 Service Guide OKIOFFICE 84 Chapter 7 Troubleshooting 13 Vertical White Stripes on Output ...
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Страница 471: ...Page 279 Service Guide OKIOFFICE 84 Chapter C Illustrated Parts List Section 9 Cover Assembly Top ...
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Страница 480: ...Rev No OKIDATA P N Description Q ty Remarks 1 40635401 Connection Cord Wire AC 1 ...