Hill-Rom Advanta P1600, Service Manual

Page: 158 / 429

Theory of Operation
Chapter 3: Theory of Operation
Page 3 - 20 Advanta™ Bed Service Manual (man168ra)
Surface control P.C. boards utilize the power supply pre-regulator for air
systems. The regulated and current-limited supply is transported via connector
P8 and a cable, part number 63729. This interface is earth-ground-referenced.
An AC line supply connector, P5, is provided for accessories or air system
control P.C. boards that require AC line voltage. This supply is not fused. The
cable for air systems is part number 63730.
The transformer, part number 64149, provides two independent, unregulated,
step-down voltages to the input rectifiers on the power supply assembly. The
transformer is connected via P6. The cable interconnect is part of the
transformer assembly.
A night light bulb assembly is connected to the power supply P.C. board via
connector P16. A cable interconnect assembly, part number 63728, connects
the bulb assembly mounted on the lower motor dust cover on the intermediate
frame.
Two accessory connectors are available for future products. They provide a
pre-regulated voltage of 13 volts, which has current limiting. The amount of
current available is dependent on installed bed features, and operation
characteristics of the product.