WhitakerAudio J C Whitaker 20 W Stereo Audio Amplifier, Manual

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20 W Stereo Audio Amplifier
3.1.1 Amplifier PWB #1 (right)
The Amplifier PWB #1 (right) includes 31 quick-disconnect terminal posts and two 4-terminal
Molex connectors. The wire connection codes for this board are given in Table 3.1. The overall
component layout of the board is shown in Figure 3.1.
Table 3.1 Amplifier PWB #1 (right) Connection Wiring Codes
(Note that the color codes for the transformers listed in this table may vary. Consult device
documentation before proceeding.)
PWB
Code Function Connection
Color Code Notes
Conn1 (4-terminal Molex connector)
GND Ground Shield Ground
INPUT Feedback circuit input to
amplifier White Connects to feedback R/C circuit on right
channel speaker terminal PWB
GND Ground NC
GND Ground NC
Conn2 (4-terminal Molex connector)
GND Ground Shield Ground
FB Audio input to amplifier White Connects to right channel volume control
GND Ground NC
GND Ground NC
The following terminals are quick-disconnect posts
GND GND Black Connects to GND terminal Rectifier PWB
BIAS Bias supply input Slate Connects to BIAS terminal on Amplifier PWB
#2 (left) and to BiasSense terminal on power
management expansion PWB
B+ +450 V dc B+ supply input Red Connects to B+ terminal on Rectifier PWB
N-1 AC neutral buss White Connects to LoadN terminal on power
management PWB
N-2 AC neutral buss Brown Connects to brown primary lead from T51
N-3 AC neutral buss White Connects to white primary lead from T51
N-4 AC neutral buss White Connects to pilot light PL51
N-5 AC neutral buss White Connects to preamp power supply
N-6 AC neutral buss VR54
Hot-1 AC hot input line Black Connects to LoadH terminal on power
management PWB
Hot-2 AC hot input line Black Connects to ‘normally open’ terminal of RYL51
Hot-3 AC hot buss Black Connects to ‘arm’ of RYL51
Hot-4 AC hot buss Blue Connects to blue primary lead from T51
Hot-5 AC hot buss Black Connects to black primary lead from T51
Hot-6 AC hot buss VR54