POWER SUPPLY VOLTAGE
Before applying power to the modem
for working on boards under power.
All boards must be in their
respective positions in the modem
prior to voltage measurements.
Voltages are checked in the top edge
of the power regulator board (Al).
2. Power ON.
lead to ground pin (TP-7).
point being tested.
+V and -V test points are the
voltages (unregulated) from the
5. Measure the +7 and -7 V dc within
6. Measure the +10 and -10 V dc within
7. If necessary, adjust voltages.