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Values are written to the digital-teanalog converters (DAC) and checked with an
analog-to digital converter.
Diagnostic Test 77 (Tachometer Test)
The tape must be unloaded for this test.
The tachometer circuit is simulated at the speed encoder inputs. A check is made
for correct speed translation at the analog-to digital converter.
Diagnostic Test 78 (Analog-teDigital Converter [ADC] Test)
Test the analog-to-digital converter for correct operation.
Diagnostic Test 80 (Motor Drive LcmpBack Test)
The tape must be unloaded for this test.
Values are written to the motor digital-to-analog (DAC) and read back at the analog-
tedigital converter.
Diagnostic Test 81 (48-Volt Power Supply Test)
The analog-to-digital converter is read for the 48-volt PSU.
Diagnostic Test 82 (Position Counter Test)
The tape must be unloaded for this test.
CHAN A and CHAN B bits are set on and off on the Quadrature Decode Circuit. A
check is made for correct counts.
Diagnostic Test 84 (Tension Shutdown Check)
This is an interactive test and the tape must be unloaded.
As the operator moves the tension arm, the status display shows
*
when a tension
shutdown limit is reached at either end of tension arm movement.
Diagnostic Test 85 (Tension Arm Sensor Check)
This is an interactive test.
As the operator moves the tension arm, the status display should change values
smoothly within the range of 0 and 255, with the best value at 150.
Diagnostic Test 86 (Speed Encoder Check)
This is an interactive test.
As the operator rot.ates the speed encoder, the front panel displays Quadrature
Decode Circuit counts. The value ranges from 0 to 4095.
Diagnostic Test 87 (Tape in Path Sensor Check)
The front panel displays
*
when the optical sensor beam is blocked.
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9348 Service Information
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