Audio Pro B2-50 - TROUBLE SHOOTING TIPS; B2-50 Does Not Work

2. TROUBLE SHOOTING TIPS
Use + pole of C104 or - pole of C103 as common point for
measurements of DC or AC voltages.
2.1 B2-50 Does Not Work
Set toggle switch in ON position.
2.1-1 Check that LEDs AUTO and ON are lit.
2.1-2 Check power fuse and fuses F501, F502.
2.1-3 Check that DC voltages are OK.
+40 V : 40+-2 V
-40 V : 40+-2 V
+15 V : 15+-2 V
-15 V : 15+-2 V
2.1-4 To localize the fault, connect a signal generator to
DIN plug J303, pins 1 and 4 in parallel. Set generator
to 5mV, 100Hz sine wave. Turn "sensitivity" (R322) and
"crossover frequency - subwoofer" (R402) to max.clock-
wise position. You should now measure as follows:
Test Point
AC Volts
A approx. 5mV
B approx. 13mV
C approx. 95mV
D approx.90mV
E approx. 90mV
F approx.40mV
G approx.0,85V
with drivers connected
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