Datapoint 3300 Guida

Datapoint

3300/

Maintenance

TABLE OF

CONTENTS

INTRODUCTION . . . . . . . . . . •. . . . . . • .

1-1

DIAGRAM SYMBOLISM . . . . . . . . . . . • 1-4

SCHEMATIC

AND

LOGIC

DIAGRAMS . . . . . . . . . . . . •. . . . . . . . 1-4

BLOCK

DIAGRAMS...............

1-5

ILLUSTRATIONS.................

1-5

THEORY

OPERATION . . • . . . . . . •.

2-1

DATA

LOGIC . . . . . . . . . . • . . . . . . . .

2-1

TRANSMIT

FUNCTION............

2-1

RECEIVE FUNCTION . . . . . . . . . . . . .

2-2

KEYBOARD . . . . . . . . . . . . . . . . . . • . 2-7

ANSWER -BACK

..................

2-13

Programming the Answer -

Back

....

2-13

INTERFACE 1

...................

2-20

INTERFACE 2

...................

2-27

Speed

Buffer

....................

2-28

MOS

...........................

2-37

DEFLECTION AMPLIFIER

.........

2-43

LOGIC

POWER

SUPPLY . . . . . . . . . . 2-53

DEFLECTION

POWER

SUPPLY . . . .

2-61

HIGH VOLTAGE

POWER

SUPPLY. . . . . . . . . . . . . . . . . . . . . . . . 2-69

CONTROL LOGIC . . . . . . . . . . . . . . . 2-69

Horizontal Deflection Timing . . . . . 2-69

Vertical Deflection Timing . . . . . . . 2-69

Cursor Positioning . . . . . . . . . . . . . . 2-70

Carriage

Return . . . . . . •. . . . . . . . 2-72

Home Up . . . . . . . . . . . . . . . . . . . . 2-72

Home Down . . . . . . . . . . . . . . . . . . 2-73

Line

Feed

and

Reverse

. . . . . . . . . . 2-73

Roll Up . . . . . . . . . . . . . . . . . . . . . . 2-73

Roll Advance . . . . . . . . . . . . . . . . . . 2-74

Roll Down . . . . . . . . . . . . . . . . . . . 2-74

MAINTENANCE...................

3-1

REMOVAL . . . . . . . . . . •. . . . . . . . . .

3-1

APPENDIX

....................•..

1A-1

LIST OF ILLUSTRATIONS

FIGURE 1-1.

NAND

GATE

..........

1-4

FIGURE 1-2. NOR GATES .

..........

1-4

FIGURE 1-3. D FLIP -FLOP

.........

1-4

FIGURE 1-4.

FLIP -FLOP

........

1-5

FIGURE 1-5.

TYPICAL

WAVEFORMS

1-5

FIGURE 1-6. KEYBOARD

AND

ANSWER -

BACK

CARDS

...........

1-6

FIGURE 1-7. INTERFACE 1

AND

INTERFACE 2 CARDS . . . . . . . . . . . . . 1-7

FIGURE 1-8. CONTROL LOGIC

AND

MOS

CARDS.................

1-8

FIGURE 1-9. DEFLECTION

AMPLIFIER

CARD

......

1-9/(1-10 blank)

FIGURE 2-1. DATAPOINT 3300

2) . . . . . . . . . . . . . . . . . 2-3/(2-4 blank)

FIGURE 2-1.

DATAPOINT

3300

..................

2-5/(2-6 blank)

FIGURE 2-2.

TYPICAL

SWITCH

CIRCUIT . . . . . . . . . . . . . . . 2-7/(2-8 blank)

FIGURE 2-3. BLOCK DIAGRAM,

KEYBOARD

............

2-9/(2-10 blank)

FIGURE 2-4. SCHEMATIC DIAGRAM,

KEYBOARD

............

2-11/(2-12 blank)

FIGURE 2-5. BLOCK

DIAGRAM,

ANSWER·

BACK

.......

2-15/(2-16 blank)

FIGURE 2-6. SCHEMATIC DIAGRAM,

ANSWER -BACK . . . . . . 2-17/(2-18 blank)

FIGURE 2-7. BLOCK

DIAGRAM,

INTERFACE 1 . . . . . . . . . 2-23/(2-24 blank)

FIGURE 2-8. SCHEMATIC DIAGRAM,

INTERFACE 1

........

2-25/(2-26 blank)

FIGURE 2-9. BLOCK

DIAGRAM,

INTERFACE

2.........

2-29/(2-30 blank)

FIGURE 2-10.

OCK

DIAGRAM,

SPEED

BUFFER . . . . . . . 2-31/(2-32 blank)

FIGURE 2-11. SCHEMATIC

DIAGRAM,

INTERFACE 2

..........

2-33/(2-34 blank)

FIGURE 2-12. SCHEMATIC

DIAGRAM,

INTERFACE 2 WITHOUT

SPEED

BUFFER

..............

2-35/(2-36blank)

FIGURE 2-13. BLOCK

DIAGRAM,

MOS

..................

2-39/(2-40 blank)

FIGURE 2-14. SCHEMATIC

DIAGRAM,

MOS

. . . . . . . . . . . . . . . . . 2-41/(2-42 blank)

FIGURE 2-15. DOT

MATRIX

GENERATION.........

2-45/(2-46 blank)

FIGURE 2-16.

MOS

LOCATOR . . . . . . . . . . . . 2-47/(2-48 blank)

FIGURE 2-17. CHARACTER

DISPLAY

..............

2-49/(2-50 blank)

FIGURE 2-18.

DRIVER

CONNEC-

TION

...........................

2-51

FIGURE 2-19.

TYPICAL

POWER

SUPPLY

BLOCK

DIAGRAM

......

2-53/(2-54 blank)

FIGURE 2-20. BLOCK

DIAGRAM,

DEFLEC-

TION

AMPLIFIER

.......

2-55/(2-56 blank)

FIGURE 2-21. SCHEMATIC

DIAGRAM,

DE-

FLECTION

AMPLIFIER

2-57/(2-58 blank)

FIGURE 2-22. +14VDC

POWER

SUPPLY . . . . . . . . . . . . . . . . . . . . . . . . 2-60

FIGURE 2-23. SCHEMATIC

DIAGRAM,

LOGIC

POWER

SUPPLY

2-63/(2-64 blank)

FIGURE 2-24. +40VDC

CIRCUIT . . . . . . . . . . . . . 2-65/(2-66 blank)

FIGURE 2-25. +120VDC

AND

+450VDC

CIRCUIT . . . . . . . . . . . . . 2-65/(2-66 blank)

FIGURE 2-26. SCHEMATIC

DIAGRAM,

DEFLECTION

POWER

SUPPLY

...............

2-67/(2-68 blank)

FIGURE 2-27. BLOCK

DIAGRAM,

CONTROL LOG

. . . . . . 2-75/(2-76 blank)

FIGURE 2-28. SCHEMATIC

DIAGRAM,

CONTROL LOG

.......

2-77/(2-78 blank)

FIGURE 3-1.

DATAPOINT

3300 WITH

COVER REMOVED

.................

3-4

FIGURE 3-2. DATAPOINT 3300, TOP

VIEW

............................

3-5

FIGURE 3-3. DATAPOINT 3300, REAR

VIEW

............

, . . . . . . . . . . . . . . 3-6

FIGURE 3-4.

DATAPOINT

3300,

BOTTOM

PANEL

..................

3-'7

FIGURE 3-5. LOGIC

AND

DEFLECTION

POWER

SUPPLIES

.................

3-8

FIGURE 3-6. DELETED

....

3-9/(3-10 blank)

FIGURE 3-7. KEYBOARD

ASSEMBLY

(1of2)

.....

3-11/(3-12 blank)

FIGURE 3-7. KEYBOARD

ASSEMBLY (2

......

3-13/(3-14 blank)

FIGURE 3-8. ANSWER -BACK

ASSEMBLY

(1of2)

.....

3-15/(3-16 blank)

FIG.URE 3-8. ANSWER -BACK

ASSEMBLY

.....

3-17/(3-18 blank)

FIGURE 3-9. INTERFACE 1

ASSEMBLY

.....

3-19/(3-20 blank)

FIGURE 3-9. INTERFACE 1

ASSEMBLY

.....

3-21/(3-22 blank)