TM 11-6625-3145-14
Theory of Operation-318/338 Service
318/338 A10 CRT BOARD <14>
The CRT circuit provides the horizontal and vertical deflection currents and electrode voltages for the CRT. A simplified
diagram is shown in Figure 4-12.
Z-AXIS AMPLIFIER
The Z-Axis amplifier stage (A10Q100, A10Q110, A10Q120, A10R245, and A10R247) controls the beam current of CRT
V200 to create the display on the screen. The Z-axis signal at the base of A10Q100 is compared with the DC voltage
(+1.4V) at the base of A10Q110, and the inverted output from the collector of A10Q100 is supplied to the cathode of V200.
The GLITCH signal at the base of A07Q120 switches the current of the differential amplifier (A07Q100 and A07Q110). If
the GLITCH signal is high, A07Q120 is turned on. When A07Q120 is on, A07R110 and A07R124 are connected in
parallel and the emitter current of A07Q100 increases. A less-positive voltage at the cathode brightens the display, while a
more-positive voltage blanks it. The voltage at G1 of V200, supplied from potentiometers A07R245 and A07R247,
controls the brightness of the display.
Figure 4-12. 318/338 Simplified diagram of the CRT circuit.
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Summary of Contents for 318
Page 119: ...318 VERIFICATION AND ADJUSTMENT PROCEDURES ...
Page 182: ...338 VERIFICATION AND ADJUSTMENT PROCEDURES ...
Page 253: ...318 ___________________ TROUBLESHOOTING TREES ...
Page 344: ...338 TROUBLESHOOTING TREES ...
Page 517: ...TM 11 6625 3145 14 318 338 4434 923 318 Block Diagram ...
Page 518: ...TM 11 6625 3145 14 318 338 4434 924 338 Block Diagram ...
Page 519: ...TM 11 6625 3145 14 318 338 4434 925 318 Acquisition Module Wiring Diagram ...
Page 520: ...TM 11 6625 3145 14 318 338 4434 926 318 338 Mainframe Wiring Diagram ...
Page 521: ...TM 11 6625 3145 14 318 338 4434 926 338 Acquisition Module Wiring Diagram ...
Page 522: ...TM 11 6625 3145 14 318 338 4434 928 Figure 9 1 318 A01 Input A Board Component Locations ...
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Page 528: ...TM 11 6625 3145 14 Figure 9 3 318 338 A03 ACQ Control Board Component Locations ...
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Page 542: ...TM 11 6625 3145 14 Figure 9 8 318 338 A10 CRT Board Component Locations ...
Page 544: ...TM 11 6625 3145 14 Figure 9 9 318 338 A11 Inverter Board component Locations ...
Page 546: ...TM 11 6625 3145 14 Figure 9 10 318 338 A12 Regulator Board Component Locations ...
Page 551: ...TM 11 6625 3145 14 Figure 9 12 338 A01 Input A Board Component Locations ...
Page 553: ...TM 11 6625 3145 14 318 338 SERVICE ...
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