HP 8560E Service Manual page 625

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.
block diagram.
The A6 power supply and A6A1 high voltage assemblies contain
WARNING
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.
624
Figure 12-4 on page 625
Troubleshooting Using the TAM ..................................
Blank Display (Using the TAM) ...................................
Blank Display ................................................................
Blanking Signal.............................................................
Display Distortion .........................................................
Focus Problems..............................................................
Intensity Problems ........................................................
illustrates the section
page 626
page 628
page 629
page 631
page 632
page 634
page 636
Chapter 12