12
Display/Power Supply Section
The Display/Power Supply Section contains the A6 Power Supply,
A6Al
HV Module, Al7
CRT Driver, and Al8 CRT. Figure 12-1 illustrates the section block diagram. Table 12-1 lists
signal versus pin numbers for Power Cable
Wl.
Page
Troubleshooting Using the TAM
.........................................
12-4
Blank Display ....................................................
.. 12-5
Blank Display
......................................................
.. 12-6
Display Distortion
...................................................
.. 12-7
Focus Problems
.....................................................
.. 12-8
Intensity Problems
....................................................
12-9
A6 Power Supply Assembly
............................................
12-11
Dead Power Supply
.................................................
12-11
Line Fuse Blowing
................................................
.. 12-13
Supply Restarting Every 1.5 Seconds (Kick Start)
......................
12-13
Low Voltage Supplies...............................................
12-13
High Voltage Supplies...............................................
12-14
CRT Supply Dropping Out..........................................
12-15
Blanking
Signal.....................................................12-15
Buck Regulator Control.............................................
12-16
DC-DC Converter Control...........................................
12-16
Power Up
.......................................................
.. 12-17
Warning
The A8 Power Supply and
A6Al
High Voltage Assemblies contain lethal
voltages with lethal currents in all areas. Use extreme care when servicing
these assemblies. Always disconnect the power cord from the instrument
before servicing these assemblies. Failure to follow this precaution can
represent a shock hazard which may result in personal injury.
Warning
The voltage potential at
A6AlW3
is
+9
kV.
If the cable must be disconnected,
always disconnect it at the CRT with caution! Failure to properly discharge
A6AlW3
may result in severe electrical shock to personnel and damage to the
instrument. See Chapter 3, Procedure 2.
Warning
Always use an isolation transformer when troubleshooting either the A6 Power
Supply or the
A6Al
HV Module. When using an isolation transformer, connect a
jumper between AGTPlOl and A6TP301. This connects the circuit common to
earth ground. Remove this jumper when the isolation transformer is not used.
Display/Power Supply Section 12-l
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