WhitakerAudio J C Whitaker 20 W Stereo Audio Amplifier, Manual

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20 W Stereo Audio Amplifier
3.3.1 Power Management Expansion Board
The power management expansion board adds additional functionality to the power management
module. The board mounts on the chassis side near the right channel amplifier PWB. Connection
details are given in Table 3.7.
Table 3.7 Power Management Module PWB Connection Wiring Codes
PWB Code Function Connection
Color Code Notes
GND Ground Black Chassis/circuit ground (2 avail-
able). Tie one to main ground
point.
+35V Positive dc input voltage Violet Connects to the V+ terminal on
the power management PWB
–60V Negative dc input voltage White Connects to the -60V terminal on
the rectifier PWB
Loop1 Interlock loop input White Connects to SW203 terminal on
the power management PWB
Loop2 Interlock loop output White Connects to SW203 terminal on
the power management PWB
SW203 High-temperature thermostat White Connects to SW203 on the chas-
sis
SW203 High-temperature thermostat White Connects to SW203 on the chas-
sis
BiasSense Bias input sample Slate Connects to BIAS terminal right
channel PWB
Cabinet Interlock
Bypass
Bypass cabinet interlock
switch, SW401
Jump to bypass switch. Note that
the cabinet interlock does not
remove all dangerous voltages
from the amplifier chassis.
CONN401 (4 terminal Molex connector)
Right channel input Right channel output sample White Connects to Head1 terminal on
right channel speaker PWB
Right channel
ground
Ground Shield drain Connects to GND terminal on right
channel speaker PWB
Left channel input Left channel output sample Black Connects to Head 1 terminal on
left channel speaker PWB
Right channel
ground
Ground Connects to GND terminal on left
channel speaker PWB
CONN402 (4 terminal Molex connector)
Timer NO Timer reset NO Yellow Connects to timer reset
(CONN201, pin #1) on power
management PWB