(b) One direction shall give an indication
(a) Connect static exciter and voltage
regulator assembly into test circuit shown in figure
of less than 100 ohms. The other direction shall
give an indication of one megohm or more. There
shall be no indication of discontinuity in either
(b) Adjust power source until VI shows
95 Vac (any frequency between 50 and 400 Hz).
(c) Replace defective semiconductors.
(5) Inspect terminal board assembly for
(c) Check for 22 Vdc across R15 (con-
nect voltmeter V2, positive side to cathode of CR 11,
cracks, burns, and corroded terminals. Replace
and negative side to heat sink where CR4-CR6 are
defective terminal board assembly.
(2) Conduct power circuit bench test as follows:
sion, and evidence of shorting or overheating. Check
(a) Install static exciter and voltage regu-
be no sign of open circuit.
(b) Adjust power source to 208 Vac at the
(8) Inspect voltage regulator assembly for
burned or damaged components.
(c) For 400 Hz units only apply 50-76 Vat,
400 Hz to terminals A and B of connector J9.
(9) Electrically check voltage regulator as-
(d) Voltmeter V2 should indicate 48 Vdc
(3) Conduct boost circuit bench test as follows:
tance value of components.
(10) If any voltage regulator components
removed, connect positive lead of voltmeter to heat
sink where CR 1-CR3 are mounted. Connect negative
must be replaced or encapsulating coating repaired
lead to heat sink where CR4-CR6 are mounted. (See
detailed procedures. Repair/replace encapsulation
by applying 0.020 inch (rein) coating of polyureathane
resin (scotchcast 221, Minnesota Mining and Mfg.
(b) Apply 12 Vac (any frequency between
50 and 400 Hz) to pins A and B of connector J13.
Co. or equal).
(11) Inspect wiring harness for damaged con-
(c) Voltmeter connected across heat sinks
nectors and terminals, burns, broken wires, and
should indicate 9.3 Vdc.
(d) Remove 12 Vac from pins A and B and
connect to E and F, then to J and K. In each case,
voltmeter should indicate 9.3 Vdc.
(4) If the requirements of any test are not met,
(13 ) If the wiring harness has sustained dam-
age and requires repair or rebuild, refer to figure
5-33 for layout, identification and material require-
as a guide
to locate the malfunction. Correct
ments and Appendix A references for detailed solder-
before installing the static exciter and voltage regula-
ing and replacement. procedures.
g. Installation. Install static exciter and volt -
e. Assembly. Assemble static exciter and
voltage regulator assembly in reverse order of re-
age regulator assembly in reverse order of removal
RELAY TABLE COMPONENTS AIIJUST-
(1) Perform sensing circuit bench test as
a. General. After maintenance has been per-
formed on any of the relay table components, the
appropriate adjustments shall be performed.
be removed to perform the bench test.