6Ć46
Put the oscilloscope in XY
mode. Select
and turn
the readout intensity to
minimum. Measure the
voltage across the delay
line (J68) with aDMM.
No
Yes
Does
the voltage vary
between 100 mV to -100 mV
as the vertical position
knob is rotated?
Perform the A5 CPU
Board Troubleshooting
Procedure.
Yes
No
Is the
A5 CPU board
okay?
Replace the A1 Analog board.
Replace the A5
CPU board.
Select
and
measure the voltage
across pins 16 and 17
of J67 with aDMM or
oscilloscope.
No
Yes
Does
the voltage change
as the vertical position
knob is rotated?
Rotate the Intensity knob
and measure the voltage at
pin 19 of J67 with aDMM
or oscilloscope.
No
Yes
Does
the voltage vary as
the position knob
is moved?
Note: In XY mode, asingle
spot should appear near
the center of the CRT.
Reduce the intensity until
the spot is dim so that the
CRT phosphor will not be
damaged.
Done.
Yes
Part Two
Yes
!
Summary of Contents for TAS 465
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Page 125: ...6 17 Front Foot Rotate and remove Mounting Screws 4 Mounting Screw...
Page 129: ...6 21 Spudger EMI Gaskets 4 H H H...
Page 136: ...6 28 Display Driver Board A3 Mounting Screw High Voltage Cover Mounting Screw H H H...
Page 137: ...6 29 CRT Implosion Shield Spudger Slot In CRT Bracket Implosion Shield Guides...
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