TB 9-4920-455-35
NOTE
Because of calibrator two-lobe cam, the accelerometer
generates two signals per revolution, causing Strobex to flash
twice per revolution. The following steps reference "h" in the
"ch" logo located in the center position of the strobe disc.
(8) Squeeze and hold Strobex trigger. Aim Strobex at calibrator rotor strobe disc to
illuminate strobe pattern. Verify that stem of "h" in logo appears stopped in two positions.
(9) Note clock angle of stem of "h" in logo. Press and hold balancer VERIFY
TUNE RPM pushbutton and adjust RPM TUNE knob until clock angle of stem of "h" is
the same as observed before VERIFY TUNE pushbutton was pressed.
(10) Release VERIFY TUNE pushbutton and observe new clock angle of stem of "h".
Repeat (9) and (10) until there is no change in clock angle of stem of "h" whether VERIFY
TUNE push-button is pressed or released.
NOTE
When balancer is tuned properly, stem of "h" appears stopped
at approximately 1:30 and 7:30 o'clock.
(11) Verify that TI indicates the following :
(a) IPS meter is between .72 and .88 at 1800 rpm.
(b) RPM TUNE dial is between 176 and 184.
(12) Release Strobex trigger.
(13) Set TI RPM RANGE switch to X1. Set calibrator CAM RATE (RPM) switch to 900.
(14) Adjust TI RPM TUNE knob for indication of 900 on RPM TUNE dial.
(15) Squeeze and hold Strobex trigger. Aim Strobex at calibrator rotor strobe disc to
illuminate strobe pattern. Verify that stem of "h" in logo appears stopped in two positions.
(16) Note clock angle of stem of "h" in logo. Press and hold balancer VERIFY TUNE
pushbutton and adjust RPM TUNE knob until clock angle of stem of "h" is the same as
was observed before VERIFY TUNE pushbutton was pressed.
(17) Release verify tune pushbutton and observe new clock angle of stem of "h".
(18) Repeat (16) and (17) until there is no change in clock angle of stem of "h"
whether VERIFY TUNE pushbutton is pressed or released.
NOTE
When balancer is properly tuned, stem of "h" appears stopped
at approximately 1:30 and 7:30 o'clock.
(19) Verify that balancer indicates the following:
(a) IPS meter is between .36 and .44 IPS.
(b) RPM TUNE dial is between 882 and 918 rpm.
(20) Release Strobex trigger.
b. Adjustments. No adjustments can be made.
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