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5 Troubleshooting
PN19MT/MO/IO
x178/19P2
5-3
5-1-3 H_Deflection Failure
IC250 Pin 26 waveform is right?
Check IC250.
Yes
No
Q401 Gate Drain waveform
is right?
Check IC250 Pin 26.
Check Q401, R404 and 25V line.
Check Q250, Q251.
Yes
No
Check some parts around
IC261 and Q262.
WAVEFORMS
6
3
210 V (Q454, Drain)
CH1 P-P = 210V
CH1 RMS = 302V
4
66.4V (Q401, Drain)
CH1 P-P = 66.4V
CH1 RMS = 25.84V
5
1.24kV (Q402, Collector)
CH1 P-P = 1.24kV
CH1 RMS = 302V
Q454 Drain waveform is right?
Yes
No
Check R467, Q454, D456,
and +210V line.
Check ZD450 and IC402 Pin 6
3
4
2
Yes
Q402 Collector waveform
is right?
5
Check and replace D403 and Q402.
Check DY connector connection.
No
2
13.0 V (Q401, Gate)
CH1 P-P = 13.0V
CH1 RMS = 7.91V
6
11.0V (IC250, #26)
CH1 RMS = 11.0V
Summary of Contents for PN19MT
Page 7: ...2 Product Specifications 2 4 PN19MT MO IO x178 19P2 Memo ...
Page 17: ...Memo 4 Alignment and Adjustments 4 8 PN19MT MO IO x178 19P2 ...
Page 36: ...PN19MT MO IO x178 19P2 6 1 6 Exploded View and Parts List 6 1 PN19MT ...
Page 37: ...6 2 PN19MO 19P2 6 Exploded View Parts List 6 2 PN19MT MO IO x178 19P2 ...
Page 38: ...6 Exploded View Parts List PN19MT MO IO x178 19P2 6 3 6 3 PN19IO ...
Page 39: ...6 4 x178 6 Exploded View Parts List 6 4 PN19MT MO IO x178 19P2 ...
Page 40: ...6 Exploded View and Parts List 6 1 1 Front Cover CRT Ass y PN19MT PN19MT MO IO x178 19P2 6 5 ...
Page 41: ...6 1 2 Chassis Stand Ass y PN19MT 6 Exploded View Parts List 6 6 PN19MT MO IO x178 19P2 ...
Page 42: ...6 2 1 Front Cover CRT Ass y PN19MO 19P2 6 Exploded View Parts List PN19MT MO IO x178 19P2 6 7 ...
Page 43: ...6 2 2 Chassis Stand Ass y PN19MO 19P2 6 Exploded View Parts List 6 8 PN19MT MO IO x178 19P2 ...
Page 44: ...6 3 1 Front Cover CRT Ass y PN19IO 6 Exploded View Parts List PN19MT MO IO x178 19P2 6 9 ...
Page 45: ...6 3 2 Chassis Stand Ass y PN19IO 6 Exploded View Parts List 6 10 PN19MT MO IO x178 19P2 ...
Page 46: ...6 4 1 Front Cover CRT Ass y x178 6 Exploded View Parts List PN19MT MO IO x178 19P2 6 11 ...
Page 47: ...6 4 2 Chassis Stand Ass y x178 6 Exploded View Parts List 6 12 PN19MT MO IO x178 19P2 ...
Page 107: ...7 Electrical Parts List 7 60 PN19MT MO IO x178 19P2 Memo ...
Page 108: ...8 Block Diagrams PN19MT MO IO x178 19P2 8 1 ...
Page 109: ...Memo 8 Block Diagrams 8 2 PN19MT MO IO x178 19P2 ...
Page 110: ...9 PCB Diagrams 9 1 Component Diagram Main PN19MT MO IO x178 19P2 9 1 ...
Page 111: ...9 2 Pattern Diagram Main 9 PCB Diagrams 9 2 PN19MT MO IO x178 19P2 ...
Page 112: ...9 3 Component Diagram Video 9 PCB Diagrams PN19MT MO IO x178 19P2 9 3 ...
Page 113: ...9 PCB Diagrams 9 4 PN19MT MO IO x178 19P2 9 4 Pattern Diagram Video ...
Page 115: ...Memo 10 Wiring Diagrams 10 2 PN19MT MO IO x178 19P2 ...
Page 127: ...11 Schematic Diagrams 11 12 PN19MT MO IO x178 19P2 Memo ...