Citizen GSX-190 Service Manual Page 125

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PN 4237242C
4.13-1
SERVICE AND REPAIR PROCEDURES
LINEAR POWER SUPPLY CARD
4
4.13 LINEAR POWER SUPPLY CARD
Tools/Supplies Needed
B #2 Phillips-head screwdriver
B Large flat-blade screwdriver
B Voltmeter
Removal
1. Turn OFF the instrument’s power.
2. Disconnect the ac power cable.
3. At the rear of the instrument, loosen the three captive thumbscrews at the top of the rear
panel drop-down door. These thumbscrews are recessed and may require the use of a
large flat-blade screwdriver (Figure 4.12-1).
4. Drop down the rear panel.
5. Electrically disconnect the Linear Power Supply card from the system. There are five
connectors (Figure 4.13-1) to remove from the card (J1 through J5).
Figure 4.13-1 Linear Power Supply Card
J5
(RBC and WBC
aperture voltage,
zap voltage out)
J3
(Commands,
+5 V in from
SPAD card)
J2
(Hgb LED
current
supply)
X3
(OFF)
X1
(OFF)
X2
(OFF)
J4
(
+15 Vdc
out)
TP8
TP7
TP6
TP5
TP4
TP3
TP2
TP1
J1
(Transformer
ac input to Linear
Power Supply card)
TP10
(WBC aperture
voltage)
TP9
(RBC aperture
voltage)
TP11
(Zap voltage)
7242004A
C
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