Zenith A50M84D Series, Service Manual

Page: 5 / 54

TABLE OF CONTENTS
CM150/PV150 TOC GM CHASSIS
Section 1
Overview (General Information) . . . . . . . . . . . 1-1
MBR3457 Remote Control (Keys Defined) . . . . . 1-2
TRK400 Remote Control (Keys Defined) . . . . . . 1-3
Programming Remote . . . . . . . . . . . . . . . . . . 1-4
Remote Control Programming Codes. . . . . . . . . 1-5
Section 2
Service Menu . . . . . . . . . . . . . . . . . . . . . . . 2-1
Servicing Small Signal Module Replacement . . . 2-4
Stereo Coefficients . . . . . . . . . . . . . . . . . . . . 2-5
Projo Convergence Setup MBR3457/TRK4000. . . 2-6
Convergence Setup Worksheet. . . . . . . . . . . . . 2-8
Convergence Setup Illustrations . . . . . . . . . . . 2-9
Section 3
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . 3-1
Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Service Adjustments . . . . . . . . . . . . . . . . . . . 3-7
GM CRT Assembly . . . . . . . . . . . . . . . . . . . . . 3-9
GM Direct View - Small Signal Diagram . . . . . . 3-10
GM Direct View - Large Signal Diagram . . . . . . . 3-11
GM Projo - Small Signal Diagram . . . . . . . . . . . 3-12
GM Projo - Large Signal Diagram . . . . . . . . . . . 3-13
Section 4
Model Parts List
. . . . . . . . . . . . . . . . . . . . . 4-1
Section 5
Mechanical Drawing
s
32/36” Stereo Table Top, Exploded View . . . . . 5-1
Inteq Projection Set, Exploded View . . . . . . . . 5-2
46/50” Projection Set , Exploded View . . . . . . . 5-3
56/60” Projection Set , Exploded View . . . . . . . 5-4
Section 6
Schematics and PCBs
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . 6-1
Interconnect Diagram . . . . . . . . . . . . . . . . . . 6-2
9-1650-02 Single PIP . . . . . . . . . . . . . . . . . . 6-3
9-1650-02 Single PIP PCB Layout . . . . . . . . . . 6-4
9-1689-02 Single PIP . . . . . . . . . . . . . . . . . . 6-5
9-1689 Two Tuner Single PIP . . . . . . . . . . . . . 6-6
9-1689-02 Two Tuner Single PIP PCB Layout . . 6-7
9-1783A IF/Audio . . . . . . . . . . . . . . . . . . . . 6-8
9-1783A IF/Stereo . . . . . . . . . . . . . . . . . . . . 6-9
9-1912/1913/1914 Small Signal Chassis . . . . . 6-10
9-1912/1913/1914 Main Small Signal Carrier . . 6-11
9-1912/1913/1914 Small Signal Audio . . . . . . 6-12
9-1912/1913/1914 Small Signal Chassis . . . . . 6-13
9-1912/1913/1914 Scan Velocity Modulator . . . 6-14
9-1912/1913/1914 Main Small Signal Carrier . . 6-15
9-1920/1922 A/V Switch . . . . . . . . . . . . . . . 6-16
9-1920/1922 A/V Switch & Jackpack . . . . . . . . 6-17
9-1920/1922 A/V Switch . . . . . . . . . . . . . . . 6-18
9-1924 2H Comb Filter . . . . . . . . . . . . . . . . . 6-19
9-1924 Signal Processor . . . . . . . . . . . . . . . . 6-20
9-1924 Video Module PCB Layout . . . . . . . . . . 6-21
9-1925/1927 & 9-2034 3D Comb Filter . . . . . . 6-22
9-1925/1927 & 9-2034 3D Comb Filter . . . . . . 6-23
9-1925/1927 & 9-2034 3D Comb Filter . . . . . . 6-24
9-1925/27 & 9-2034 PCB Layout
3D Comb Filter . . . . . . . . . . . . . . . . . . . . . . 6-25
9-1932 Microcontroller . . . . . . . . . . . . . . . . . 6-26
9-1932 PCB Layout Microcontroller . . . . . . . . . 6-27
9-1934/1935 DV Video Output . . . . . . . . . . . . 6-28
9-1936/1938 Projo Video Output . . . . . . . . . . 6-29
9-1978 Projo Power Supply . . . . . . . . . . . . . . 6-30
9-1978 Projo Power Supply . . . . . . . . . . . . . . 6-31
9-1978 Projo Power Supply . . . . . . . . . . . . . . 6-32
A-17821-05 Projo Supply Daughter Board . . . . 6-33
9-1978 Projo Power Supply PCB Layout . . . . . . 6-34
9-1916/79 Direct View Switch Mode
Power Supply . . . . . . . . . . . . . . . . . . . . . . . 6-35
9-1916/1979 Direct View Deflection . . . . . . . . 6-36
A-18347 Two Tuner Antennas Switch . . . . . . . 6-37
Voltage Waveforms . . . . . . . . . . . . . . . . . . . . 6-38