HP 8560E - Page 625

624 Chapter12
Display/Power Supply Section
CRT Display (8560E)
CRT Display (8560E)
The CRT display section contains the A6 power supply, A6A1 HV
module, A17 CRT driver, and A18 CRT. The A6 power supply and A6A1
HV module are explained in the section on the power supply which
begins on page 590. Figure 12-4 on page 625 illustrates the section
block diagram.
Troubleshooting Using the TAM.................................. page 626
Blank Display (Using the TAM)................................... page 628
Blank Display................................................................ page 629
Blanking Signal............................................................. page 631
Display Distortion......................................................... page 632
Focus Problems.............................................................. page 634
Intensity Problems........................................................ page 636
WARNING The A6 power supply and A6A1 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.
The voltage potential at A6A1W3 is +9 kV. If the cable must be
disconnected, always disconnect it at the CRT with caution!
Failure to properly discharge A6A1W3 may result in severe
electrical shock to personnel and damage to the instrument.
See procedure 2 in Chapter 3.
Do not discharge the CRT second anode directly to ground,
with the A6A1 high voltage cable connected. This can damage
the A17 CRT driver assembly. Always discharge through a high
resistance, such as a high voltage probe.
Always use an isolation transformer when troubleshooting
either the A6 power supply or the A6A1 HV module. When using
an isolation transformer, connect a jumper between A6TP101
and A6TP301. This connects the circuit common to earth
ground. Remove this jumper when the isolation transformer is
not used.