Radio Shack TRS-80 Service Manual page 4

LIST
OF ILLUSTRATIONS
FIGURE
PAGE
1-1
Line Printers
1-1
1-2
Basic Block Diagram
1-1
1-3
Character Printing/Paper
Motion
1-2
2-1
Simplified
Block Diagram,
Electronics
2-1
2-2
Initializing
the Printer
2-2
2-3
Data Input
2-3
2-4
Character Printing
2-4
2-5
Carriage
and Ribbon Movement
2-5
2-6 Paper Motion
2-6
2-7
+5
VDC
Power Supply
2-7
2-8
-12 VDC
Power
Supply
2-8
2-9
+35
VDC
Power Supply
2-8
3-1
Printer Subassemblies
3.
2
3-2 Cover Assemblies
3.4
3-2A
Print
Head Assembly
3-6
3-3
Penetration Control Adjustment,
Print
Head Assembly
3-7
3-3A
Kit,
Video
Amplifier Assembly
3-8
3-3B
Kit,
Ribbon
Cartridge
Assembly
3.9
3-4
Carriage Assembly, Removal/Replacement
3-10
3-5
RTPand EOP
Actuator
Arm
Adjustments
3-11
3-5A
Kit, Drive
Motor Assembly, Removal/Replacement
3-12
3-6
Drive
Motor Assembly
Adjustments
3-13
3-6A
Kit,
Platen Drive
Assembly
3. 14
3-7
Platen Drive
Assembly, Adjustments
3_14
3-7A
Kit,
Platen
Assembly
3_1
6
3-8
Platen
Assembly Adjustment
3-16
3-8A
Kit,
Pinch
Roller
Assembly
(26-1150)
3-18
3-8B
Column
Scale/Tear Bar Assembly
3_19
3-8C Tractor Drive and
Pin
Feed Assembly
(26-1
152)
3-20
3-8D Tractor
Drive
Timing
Belt
Tension
(26-1
152)
3_22
3-8E
Paper
Travel
Adjustment, Tractor
Drive (26-1
152) 3-22
3-8F
Control
Panel
Assembly
3.23
3-8G
Kit,
Primary Voltage
Assembly
3.24
3-8H
Electronic
Module Assembly
3.25
3-8
1
Kit,
Logic
Board Assembly
3_26
3-9
Deleted
3-10
Deleted
3-1
1
Line Lengths
3.27
3-12
Kit, Special
Tools
3_28
4-1
Schematic Diagram,
Electronics Board
4.4
4-2
Schematic Diagram, Video
Amplifier
4.5
4-3 Wiring Diagram,
Printer
4.6
4-4
Wiring Diagram, Primary Voltage
4.7
Assembly
Diagram,
Electronics
Board
4.8
4-5
4-6
Assembly
Diagram, Video
Amplifier
4.9