Toshiba GD-1221, Service Manual

© 2006 - 2008 TOSHIBA TEC CORPORATION All rights reserved

GD-1220/1221

CONTENTS

1

CONTENTS

GD-1220/1221

1. SPECIFICATIONS AND OUTLINE OF SYSTEM ......................................................... 1-1

1.1 FAX Options ........................................................................................................................ 1-1
1.2 Specifications....................................................................................................................... 1-2
1.3 Features .............................................................................................................................. 1-5
1.4 Accessories and Parts ......................................................................................................... 1-8
1.5 Options ................................................................................................................................ 1-9
1.6 System List ........................................................................................................................ 1-10
1.7 Units and Components ...................................................................................................... 1-11
1.8 Layout of PC Boards.......................................................................................................... 1-12

2. LSU-RELATED FUNCTIONS ....................................................................................... 2-1

2.1 Recording paper size........................................................................................................... 2-1
2.2 Effective recording area....................................................................................................... 2-2
2.3 Print mode ........................................................................................................................... 2-4
2.4 Recording paper selection algorithm and print algorithm .................................................... 2-5

2.4.1 Recording paper selection algorithm........................................................................ 2-5
2.4.2 Print algorithm .......................................................................................................... 2-5

2.5 Error processing ................................................................................................................ 2-14
2.6 Limitations on reception print............................................................................................. 2-15

3. DIALING/COMMUNICATION CONTROL..................................................................... 3-1

3.1 Circuit Connection and Procedure to Change Mode ........................................................... 3-1

3.1.1 Dial call-up transmission to a telephone circuit ........................................................ 3-1
3.1.2 Selection of the communication mode ..................................................................... 3-2
3.1.3 Procedure to select the transmission mode ............................................................. 3-2

3.2 Signaling System Diagram and Signal Forms ..................................................................... 3-3

3.2.1 Circuit control signals ............................................................................................... 3-3
3.2.2 Communication with the binary signals .................................................................... 3-4
3.2.3 V.8/V.34 communication sequence........................................................................ 3-12

3.3 FAX Automatic Switching .................................................................................................. 3-25

3.3.1 General functions ................................................................................................... 3-25
3.3.2 TEL mode............................................................................................................... 3-25
3.3.3 FAX mode .............................................................................................................. 3-25

4. ELECTRICAL CIRCUITS .............................................................................................. 4-1

4.1 Configuration ....................................................................................................................... 4-1
4.2 Description of Circuits.......................................................................................................... 4-2

4.2.1 Configuration ............................................................................................................ 4-2
4.2.2 Line path switching control circuit............................................................................. 4-4
4.2.3 Dial pulse generation circuit ..................................................................................... 4-6
4.2.4 Line current detection circuit .................................................................................... 4-8
4.2.5 CI detection circuit.................................................................................................. 4-10
4.2.6 Line monitor circuit ................................................................................................. 4-12

4.3 PC Boards ......................................................................................................................... 4-15

5. INSTALLATION ............................................................................................................ 5-1

5.1 Explanation to the Users...................................................................................................... 5-1