Hobart Brothers 6910, Operation And Maintenance Manual With Illustrated Parts List

Page: 111 / 206

Trouble Shooting Chart (Sheet 11 of 20)
Figure 5
TROUBLE, SYMPTOM TEST, CHECK, AND/OR
AND CONDITION PROBABLE CAUSE REMEDY
GENERATOR AND EXCITATION CIRCUIT (CONTINUED)
1. No (or low) gen- (4) Defective Amph- (4) Disconnect voltage reg-
erator output volt- enol connector at ulator Amphenol connec-
age in all phases. voltage regu- tor (See TM-759 or OM-2020).
Generator operating lator, or defec- Using jumper leads
at 400 Hz in AUTOMATIC tive wiring from with clip and prod terminals,
mode. regulator to connect 12-V DC
(Cont’d) exciter field. to terminals “E” and “C”
in loose plug. Connect
NEGATIVE to terminal “E”
Connect POSITIVE lead to
“C” terminal (see Fig.
6). If the generator
will NOT produce a normal
voltage, replace or
repair Amphenol connector
and wiring between
voltage regulator and
exciter field as re-
quired.
(5) Defective voltage (5) All components in the
regulator excitation circuit except
the voltage regulator
have been tested in
steps (1) through (4)
above. This leaves only
the regulator as a cause
of trouble. Replace complete
voltage regulator
2. No (or low) output A. Defective generator A. Place AUTO-MANUAL control
voltage when operating manual control excitation switch (33, Fig. 1) in AUTO
in MANUAL mode circuit. position. If a normal voltage
is NOT produced, perform
checks as instructed in GEN-
ERATOR AND EXCITATION
CIRCUIT TROUBLE 1, above.
If a normal voltage is produced,
proceed to step “B” below.
OM-2028
June 20/89 Revised 3-1
Page 19