Specifications

e. Voltage Supply Limits Sensing Cir-
cuit Test.
(1) Perform the alignment procedure
for the voltage supply limits
sensing circuit (para 43 c).
(2) If the circuit does not adjust pro-
perly. Prooceed to f below.
(9) If the circuit does adjust properly,
trouble Isolation In assembly A7800
is complete.
f. Voltage Supply Limits Sensing Cir-
cuit Isolation.
(1) Adjust the 721A for an output volt-
age of +12 volts dc and apply it to
the test probe.
P7801-K
15.7
P7801-L
12
Q7801 emitter
9.5
CR7801 and R7806
9.1
P7801-M
1.95
(2) Measure the dc voltage listed in
the chart below with an ME-26B/U
to isolate the faulty part.
Circuit junction
+dc voltage to
ground (Volts)
(3)
(4)
(5)
Remove the test signal and set the
TS-1777/VRM-1 ON-OFF switch
S7901 to OFF.
Replace the faulty part.
Repeat e above
63