EU/AU/AS/C models
NCU board
+12V RLY3
CML relay
112
+5V
Q4
3
FAX board
3 CML1 21
4 Lb 4
1 5
0 3
6 1
AG
IC29
[IC26]
Line
External telephone
| 3 | La | 1 | 8 |
| 9 | 10 | ||
CN3 |
|
| 0 | |
2 | a2 |
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| 5 | b2 |
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IC1
42
Q6
SG
T1
AG
Ring signal
detection
circuit
4
Line path switching circuit
CN4
CN501
4 LD1 20
ASIC
Fig.
The dial pulse generation circuit consists of the photocoupler (IC1), the ASIC (IC29 [IC26]) on the FAX board and the other peripheral devices. It generates the dial pulses in the FAX transmission and dialing to the outside.
The ASIC makes the CML1 signal become HIGH to connect the line to the MODEM side. To generate the dial pulses, the ASIC makes the LD1 signal become HIGH to turn ON Q6. This allows the photocou- pler to come on and the current flows through the line for sending a dial attempt.
Signal Name | Type | Active | Description | Destination |
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LD1 | O | H | Line 1 Dial Pulse Generation Signal | Q6 |
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*Values in [ ] are for
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ELECTRICAL CIRCUITS |
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08/03