Hitachi 27GX01B-501, Service Manual

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Important Safety Notice . . . . . . . . . . . . . . . . . . 2
Safety Precautions . . . . . . . . . . . . . . . . . 2
Product Safety Notice . . . . . . . . . . . . . . . . . . . . 4
Horizontal Oscillator Disable Circuit . . . . 5
Receiver Feature Table . . . . . . . . . . . . . . . . . . . 6
Location of Controls (Receiver)
Receiver Front Control Panel . . . . . . . . . 7
Location of Controls (Remote). . . . . . . . . . . . . 8
Disassembly for Service . . . . . . . . . . . . . . . . . 13
Disassembly for CRT Replacement . . . . . . . . 13
Chassis Service Adjustment Procedures . . . 14
131.0V B+ Voltage Confirmation . . . . . 14
Source Voltage Chart . . . . . . . . . . . . . . 14
B+ 5V Source Voltages. . . . . . . . . . . . . 14
MPU 5V . . . . . . . . . . . . . . . . . . . . . . . . 14
Stand-by 5V . . . . . . . . . . . . . . . . . . . . . 14
B+ 9V Source Voltage . . . . . . . . . . . . . 14
B+ 12V (Stand-by) . . . . . . . . . . . . . . . . 14
High Voltage Check . . . . . . . . . . . . . . . 14
Purity and Convergence Procedures . . . . . . 15
Serviceman Mode (Electronic Controls) . . . . 18
Entering Serviceman Mode . . . . . . . . . 18
Toggle between Modes. . . . . . . . . . . . . 18
Exiting the Serviceman Mode . . . . . . . . 18
Sub-Data Adjustment . . . . . . . . . . . . . . 19
Cut-Off Adjustment . . . . . . . . . . . . . . . . 19
Pin Cushion Adjustment . . . . . . . . . . . . 20
MTS Adjustment . . . . . . . . . . . . . . . . . . 20
PIP Adjustment . . . . . . . . . . . . . . . . . . . 21
Options Adjustment . . . . . . . . . . . . . . . 22
Comb Filter Adustment . . . . . . . . . . . . . 23
To Check Purity . . . . . . . . . . . . . . . . . . 24
Helpful Hints . . . . . . . . . . . . . . . . . . . . . 24
Instructional Flow Chart
for Serviceman Mode . . . . . . . . . . . . . . . . 25
Service Adjustments
(Electronic Control). . . . . . . . . . . . . . . . . . 28
Sub-Brightness . . . . . . . . . . . . . . . . . . . 28
Sub-Contrast. . . . . . . . . . . . . . . . . . . . . 28
Tint/Color Adjustment . . . . . . . . . . . . . . 28
Color Temperature Adjustment . . . . . . . 29
Horizontal Centering . . . . . . . . . . . . . . . 30
MTS Circuit Adjustment . . . . . . . . . . . . 30
Clock Adjustment (S7) . . . . . . . . . . . . . 31
Vertical Size . . . . . . . . . . . . . . . . . . . . . 31
Service Adjustments
(Mechanical Controls). . . . . . . . . . . . . . . . 31
Focus (Part of T551). . . . . . . . . . . . . . . 31
Audio Signal Path Block Diagram . . . . . . . . . 32
Video-Chroma Signal Path
Block Diagrams . . . . . . . . . . . . . . . . . . . . . 33
IC101 VCJ IN/OUT Pins and Functions . . . . . 34
IC001 MPU IN/OUT Pins and Functions. . . . . 35
Components Identification . . . . . . . . . . . . . . . 36
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39