Tektronix 455 - Page 5

455/A2/B2
TABLE OF CONTENTS (cont)
SECTION 4 — CIRCUIT DESCRIPTION (cont) Page
Crt Circuit 4-4
High-Voltage Oscillator 4-4
High-Voltage Regulator 4-4
High-Voltage Circuitry 4-5
Crt Control Circuits 4-5
Z Axis Amplifier 4-5
Low-Voltage Power Supply 4-5
Power Input 4-5
Secondary Circuit 4-6
Channel 1 and Channel 2 Input Circuits 4-7
Scale Factor Control 4-7
Input Coupling and Volts/Division Switching 4-7
FET Input Source Follower 4-7
Vertical Preamplifier and Switching 4-7
Preamplifier and Channel Switching Gates 4-7
Channel Switching Multivibrator 4-10
Vertical Output Am plifier 4-11
Delay-Line Driver 4-11
Normal Trigger Pickoff 4-11
Vertical Output Am plifier 4-11
Trigger Input 4-12
Trigger Coupling 4-12
Input Source Follower 4-12
Trigger, Sweep, and Horizontal Preamplifier 4-12
A and B Trigger Generators 4-12
Sweep Generator IC's 4-15
Miller Sweep Generator 4-15
Sweep Control 1C 4-16
Sweep Control Operation 4-17
A Sweep Mode 4-17
B Dly'd Sweep Mode 4-18
A Inten Sweep Mode 4-18
Horizontal Preamplifier 1C 4-19
SECTION 5 — MAINTENANCE
Cabinet Removal 5-1
Preventive Maintenance 5-1
Cleaning 5-1
Interior 5-1
Switch Contacts 5-2
Exterior 5-2
Crt 5-2
Visual Inspection 5-2
Lubrication 5-2
Semiconductor Checks 5-2
Recalibration 5-2
Corrective Maintenance 5-3
Obtaining Replacement Parts 5-3
Standard Parts 5-3
Special Parts 5-3
Ordering Parts 5-3