WhitakerAudio JC Whitaker 20 W Stereo Integrated Audio Amplifier, Manual

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20 W Stereo Integrated Audio Amplifier
schematic diagram and component layouts are helpful for this. If a relay is suspected of being
inoperative, remove power, replace the device, and check again.
If more detailed troubleshooting is necessary, the power management PWB can be mounted at
a right-angle to the chassis using the L-angle brackets used during interconnection of the power
management board to the rest of the amplifier. Use the following procedure:
• Remove all power from the amplifier. Disconnect the ac line plug and check that the B+
voltage has decreased to zero.
• Remove the four screws from the power management PWB. Using the L-angle brackets,
mount the board at a right angle to the chassis deck using the available #6 hardware. Be
careful to not stress the board while mounted in this way, as it could crack the edge of the
PWB. Important : the brackets should rest against the component side of the board. If
mounted with the brackets against the foil side of the board, component damage may
result. See Figure 6.1.
– Connect the amplifier to an ac power source and turn the amplifier on. Note that RYL202
will close immediately (the state of the unit is shown on the top cover). After about 30–60
seconds, RYL204 will close. Both relays should stay closed. If RYL202 drops out after
Figure 6.1 The power management PWB mounted in the service position.