Zenith ZVM-1240-EM Manuals

Manuals and User Guides for Zenith ZVM-1240-EM. We have 1 Zenith ZVM-1240-EM manual available for free PDF download: Service Manual

Zenith ZVM-1240-EM Service Manual

Zenith ZVM-1240-EM Service Manual (30 pages)

Monochrome Video Monitors

Brand: Zenith | Category: Monitor | Size: 6.58 MB

Table of Contents

Table of Contents
3
Characteristics
5
Controls,Cables, and Indicators
5
ZVM-1240 and ZVM-1240-E Monitors
5
Specifications
6
Installation
7
BASIC Program Used to Fill the Screen with a Character
7
Circuit Description
8
ZVM-1240 and ZVM-1240-E Monitor Block Dia- Gram
8
Power Supply
9
High B + Indicating Circuit
9
Video and Highlight Driver Circuits
9
Horizontal Sweep
9
Horizontal Output
10
Vertical Sweep
10
Spot Burn Protection
11
Brightness
11
Focus
11
Dynamic Focus
11
Servicing
12
Safety and Service Guidelines
12
- AC Leakage Test
  12
AC Leakage Voltmeter Circuit
12
- Other Precautions
  13
Suggested Equipment and Supplies
13
- Tools and Supplies
  13
- Test Equipment
  13
Troubleshooting
13
General Troubleshooting
14
Circuit Board Troubleshooting
14
Adjustments
15
- B+ (+16.2 V) Voltage
  15
- Focus
  15
- CRT Yoke
  16
  - Positioning
    16
  - Linearity
    16
Cleaning Procedures
16
Servicing Diagrams
16
Main Board Component Location
17
Main Board Waveforms
17
ZVM 1240-/1240-E Schematic
17
B+ Supply Component Location
18
Waveform - Anode of CRX506
18
B+ Supply Schematic - ZVM-1240
18
B+ Supply Schematic - ZVM-1240-E
18
B + Supply Transistor Voltages
18
CRT Board Component Location
19
CRT Board Waveforms
19
CRT Board Schematic
19
ZVM-1240/1240-E Exploded View
20
Disassembly/Reassembly
21
- Back Cover (130)
  21
- CRT Board (125)
  21
- Main Board (80)
  21
- Control Mounting Bracket (40)
  22
- Power Switch (110)
  22
- Crt (10)
  22
- Lead Dressing
  22
Parts Lists
23
Major Assemblies
23
Electronic Components
24
Waveform Photograph Explanations
28

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