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Transceiver and Processing Unit
D-35
D.7.5 Power Supplies
Refer to Drawing 14303210.
A 200 VDC power supply supplies power to the towfish and is fused on the back
of the TPU. 200 VAC enters the power supply board from the transformer at JP2,
and 200 VDC is generated which and can be measured between the base of the
fuse holder and the top of the BNC cable at the TOWFISH connector J1 on the rear
panel of the TPU as shown in Figure D-9. D9, which is shown in Figure D-10,
lights if there is excessive current draw, such as a cable short.
+5 VDC, +12 VDC and -12 VDC are generated from a separate power supply
located center rear. This is also used to supply the VME chassis and the 200 VDC
power supply. The +5 volts can be measured on the power supply across the red
and black wires. AC is the input power. The +12 VDC and -12 VDC can be
measured at connector JP4 on the 200 VDC power supply.
Figure D-9:
Measuring the 200 VDC Output to the Towfish
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