Tandy 1000 SL Technical Reference Manual page 225

S tart-Up
Load power supply with minimum load as specified in Table 1.
Check up
on
the voltage selector jumper and don't apply over
voltage. Bring up power slowly with the Variable Transformer
while monitoring the
+S
output with the oscilloscope and DVM.
Supply should start with approximately 40-60/80-120 VAC applied,
and should regulate when 90/180
VAC
is reached. If output has
reached
5
volts, do a performance test on operating
characteristics, if there is no output, refer to
"NO
output"
section.