5-17
(Continued)
Table 5-7 Logic Board Test Points Description
Test
Point
Return Description Type Nom. Range
Values
Notes
TP8 TP37, 41 or 42 5V Reference Analog 4.75 to 5.25 V
TP9 TP37, 41 or 42 2.5V Reference Analog 2.4 to 2.6 V
TP10 TP37, 41 or 42 Exposure Switch Digital 0 or 5 V 0 V during exposure
switch closure
TP12 TP37, 41 or 42 X-ray On Digital 0 or 5 V 5 V during exposure
TP14 TP37, 41 or 42 10V Reference Analog 9.5 to 10.5 V
TP16 TP37, 41 or 42 15V Output Analog 14.5 to 15.5 V Power supply
TP17 TP37, 41 or 42 5V Output Analog 4.75 to 5.25 V Power supply
TP18 TP37, 41 or 42 -15V Output Analog -14 to -16 V
TP28 TP37, 41 or 42 Filament I sense Analog 1.9 to 2.3 V During standby;
2 V/ 1A
TP29 TP37, 41 or 42 Preheat I Command Analog -1.9 to -2.3 V During standby
TP30 TP37, 41 or 42 mA Setpoint Analog 6.7 to 7.3 V
TP31 TP37, 41 or 42 mA Feedback Analog 0 V During exposure;
1 V/1 mA
Note: There is no
voltage at this test
point unless an
exposure is being
made
TP32 TP37, 41 or 42 HV I Sense Analog 0V During standby;
1 V/2 A
TP33 TP37, 41 or 42 kV Feedback Analog 0V During exposure;
1 V/20 kV
Note: There is no
voltage at this test
point unless an
exposure is being
made
TP34 TP37, 41 or 42 kV Setpoint Analog 3.1 to 3.4 V
TP37 NA Analog Ground Analog NA
TP39 TP40 5V Digital Analog 4.75 to 5.25 V Power Supply
TP41 NA Analog Ground Analog NA
TP42 NA Analog Ground Analog NA
TP43 TP37, 41 or 42 X-ray Indicate Digital 0 or 5 V 5 V during exposure
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