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Adjustment Procedures
AM700 Audio Measurement Set Service Manual
5–13
ESD free table or work station so they will be safe from ESD (electros-
tatic discharge) damage.
CAUTION. The back-up battery on the CPU needs to be protected from being
accidentally shorted.
e. Remove the two screws from Digital Audio board, and then lift the
circuit board gently away from the plastic posts. Put this board on an
ESD free table to protect it from damage until it is ready to be rein-
stalled.
f. Remove all the screws holding the power supply shield, (that is the large
shield between the Digital audio board and the power supply board). The
front of the shield is pushed into the groove in the front casting. Use a
flat head screwdriver to aid in loosening the shield from the groove. Lift
the shield out and put it aside.
After replacing the CRT, the deflection yoke, or the display monitor circuit
board, use the following procedure to start up the display monitor for alignment.
1. Insert a shorting jumper on pins 9 and 10 of J5 of the power supply. (This
jumper enables the power supply to operate without the normal cable
attached to this connector.)
2. Leave the power supply cables on J7 and J9 (power to Acquisition and
Generator boards) on the power supply connected. (This provides enough
loading for proper regulation of the power supply.)
3. Disconnect the trace rotation coil on the display monitor circuit board at J7.
4. Apply power to the AM700 and verify that the fan blows air out of chassis.
The following procedure for yoke alignment should be required only if the CRT
or deflection yoke has been changed in a repair.
CAUTION. High voltages are present on the display monitor circuit board and
around the CRT. Use extreme caution not to contact the high voltage anode lead,
the high voltage transformer, or the anode connection to the CRT while the
power is applied to the AM700.
1. Install the test graticule on the front of the CRT.
2. Check that a free-running raster is present on the display.
3. Adjust the raster size to fill the display area (Width L4, Vert. Size R43)
Turn on Procedure
After a Repair
Yoke Alignment