e-STUDIO170F Circuit Description
January 2005 © TOSHIBA TEC
7 - 58
EU/AU models
Fig.7-40
The dial pulse generation circuit consists of the photo-coupler (IC1), the ASIC (I/O port: IC38) on the
Main PBA, and other peripheral devices. It generates dial pulses in facsimile transmission and dialing
outside.
The ASIC causes the CML signal to go HIGH to connect the line to the MODEM side. To achieve a dial
make, the ASIC causes the LD signal to go HIGH to turn on Q6. This allows the photo-coupler to turn
on and allow current to flow through the line for sending dial pulses.
Signal Name
Type
Active
Description
Destination
LD
O
H
Dial pulse generate signal
Q6
CML
LD
3
4
AG
SG
Q4
Lb
La
0
1
0
1
+12V
RLY3
CML relay
4
3
3
4
49
50
Main PBA
NCU PBA
IC38
ASIC
(I/O port)
Line path
switching
circuit
CN4
CN16
IC1
Q6
+5V
CN3
Line
T1
AG
8
5
6
2
1
4
12
9
4
1
Содержание ESTUDIO170F
Страница 1: ...SERVICE MANUAL PLAIN PAPER FACSIMILE e STUDIO170F File No SME04002900 R04102171300 TTEC Ver01_2005 05 ...
Страница 2: ... 2005 TOSHIBA TEC CORPORATION All rights reserved ...
Страница 192: ...e STUDIO170F Function Settings January 2005 TOSHIBA TEC 4 132 ...
Страница 214: ...e STUDIO170F Mechanical Description January 2005 TOSHIBA TEC 5 22 ...
Страница 308: ...e STUDIO170F Circuit Description January 2005 TOSHIBA TEC 7 78 ...
Страница 372: ...e STUDIO170F Removal Replacement Adjustment January 2005 TOSHIBA TEC 8 64 ...
Страница 490: ...e STUDIO170F Appendix January 2005 TOSHIBA TEC 12 8 ...
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