Service manual

PN 4237242C
2.2-8
INSTRUMENT DESCRIPTION
POWER SUPPLY
Inputs
r J1 - Transformer ac input to Linear Power Supply card
r J3 - commands, +5 V from SPAD card
Outputs
r J2 - Hgb LED
r J4 - ±15 Vdc
r J5 - RBC aperture voltage, WBC aperture voltage, and zap aperture voltage
Test Points
Jumpers
X1 (GND1), X2 (GND2), X3 - These jumpers should be OFF for instrument operation. See
Figure 2.2-4 for location. They are used to provide grounding for testing the card outside of
the unit. Normal system connection provides grounding through the Sensor Preamp Adapter
card.
Table 2.2-3 Linear Power Supply Card Test Points
Test Point Supply
TP1 +240 Vdc ground
TP2 +240 Vdc
TP3 -15 Vdc ground
TP4 -15 Vdc
TP5 +15 Vdc ground
TP6 +15 Vdc
TP7 Hgb LED cathode (negative lead)
TP8 Hgb LED anode (positive lead)
TP9 RBC aperture voltage
TP10 WBC aperture voltage
TP11 Aperture zap voltage (200 V)
C