Refer the below Circuit diagram to measure the voltages on the Rear Panel
Board- Power Module;
Insure that AC power supply is available at PS1 pin 1 & 2.
To measure the +15 VDC, put the multimeter –Ve lead at GND point “A” &
put the multVe at +15 VDC test point OR PS1 pin “8”, observe the
measured voltage.
To measure the -15 VDC, put the multimeter –Ve lead at GND point “A” &
put the multVe at -15 VDC test point OR PS1 pin “3”, observe the
measured voltage.
To measure the +5 VDC, put the multimeter –Ve lead at GND point “A” &
put the multVe at +5 VDC test point OR PS1 pin “7”, observe the
measured voltage.
If all three +15 VDC, -15VDC & +5 VDC are correct then the Power supply
module is OK, other wise it need replacement.