TM
FlexRadio Systems 2003 Page 10
How to Test the Power Supply Voltages on the PIO Board?
Operational Description: The PIO board contains regulators for 5VDC, two 3.3VDC
sources, 12VDC, and +/-15VDC. These supplies may be tested without the PIO board
attached to the TRX board. All measurements should be made on the bottom side of the
TRX board to prevent the possibility of shorting the power supply pins and causing
damage. The voltage measurements are as follows:
1. +12V regulated – J2 pin 9
2. +15V unregulated – J5 pin 2 (no load - approximately 18 to 21 volts) CAUTION,
DO NOT SHORT!!!
3. –15V unregulated – J5 pin 1 (no load - approximately –18 to –21 volts)
CAUTION, DO NOT SHORT!!!
4. +5V regulated – J5 pin 6
5. +3.3V regulated – J4 pin 9
6. +3.3V regulated – J4 pin 10
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