WhitakerAudio J C Whitaker 20 W Stereo Audio Amplifier, Manual

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20 W Stereo Audio Amplifier
3.3 Power Management Module
The power management PWB mounts at the rear of the chassis and is inverted, relative to the
other boards; the component side faces the chassis deck. This is a space-saving technique. The
system is contained on a single PWB that interfaces with other boards in the amplifier.
Connection details are given in Table 3.6.
Table 3.6 Power Management Module PWB Connection Wiring Codes
PWB Code Function Connection
Color Code Notes
GND Ground Black Chassis/circuit ground (2
available). Tie one to main ground
point.
ACneutral AC power neutral White Connects to ac line filter FL51
neutral terminal
LoadN Amplifier load neutral White Connects to ac neutral for amplifier
board #1 (N-1)
AChot AC power hot Black Connects to ac line filter FL51 hot
terminal
Switch1 Front panel power switch Black Connects to front panel power
switch, SW51
Switch2 Front panel power switch Black Connects to front panel power
switch, SW51
LoadH Amplifier load hot Black Connects to ac hot for amplifier
board #1 (Hot-1)
SW203 Interlock loop White Connects to Power Management
Expansion board
SW203 Interlock loop White Connects to Power Management
Expansion board
B+ Sense B+ voltage sense input White Connects to B+Sense supply on
amplifier board #2
V+ +40 V dc (approx.) source
when unloaded Violet Connects to +35V terminal on the
power management expansion
PWB
V+HV +40 V dc (approx.) source
when unloaded; switched on
by B+ Good condition Violet Connects to preamplifier power
supply board V+ input
CONN201 (4 terminal Molex connector)
Reset Timer reset Yellow Connects to timer reset on Power
Management Expansion board,
CONN402
Reset Timer reset Yellow Connects to timer reset on Power
Management Expansion board,
CONN402