Remedy
Probable Cause
Trouble
Check cord and plug; replace if needed.
Ac power (line) cord or plug P1 are
Power source checks, but
defective.
tube filaments do not light
(cont.)
Check transformer; replace if needed.
Power transformer T1 is defective.
Check input circuitry. Replace defec-
Set the OPERATION selector switch
Meter does not respond to
to C position. Turn the RANGE
tive components or perform such
normal input signal
minor repairs as are necessary and
selector switch to 5. If meter indi-
feasible.
cation is obtained and amplifier is
operating, the difficulty is to be
found in the input circuitry.
If meter does not indicate with the
Check V1 and replace if defective.
OPERATION selector switch at C
Check associated circuitry. Replace
and the RANGE selector switch at 5,
defective components, or perform such
depress the CALIBRATE SIGNAL
repairs as are necessary and feasible.
control. If the meter now indicates,
the difficulty is to be found in V1 or
its associated circuitry.
Check power voltages to determine if
If meter does not indicate with the
V4, V5, and V6 are operating properly.
OPERATION selector switch at C, the
Refer to figures 1-26 and 1-27 for
RANGE selector switch at 5, and the
typical voltages. Perform such
CALIBRATE signal control depressed,
replacement or repairs as are neces-
the trouble may be in the power supply
sary after circuitry check.
and V1 or V2 or their associated
Check EXT. METER connector and
If meter is erratic and appears to be
bend contacts back into proper position,
sluggish, EXT. METER connector may
If unable to repair, replace connector.
have been damaged during removal of
chassis assembly from case, opening
the normally closed contact.
If power supply is operating properly,
Check V2 and V3. Check circuitry.
Replace any tubes found to be defective.
again, depress the CALIBRATE
SIGNAL control with the OPERATION
Replace component found to be defec-
tive, or perform such repairs as are
selector switch in C position. Meas-
necessary and feasible.
ure the voltage at pin 7 of V2. The
CALIBRATE SIGNAL control should be
capable of adjusting this voltage to at
least 15 millivolts which should give
approximately full scale reading on the
meter. If the voltage at pin 7 of V2 is
correct and no meter reading is
obtained, the difficulty will be found in
V2 or V3 or their associated circuitry.
Transient response is poor
Rectifiers for the dc filament supply
Tighten holder to which rectifiers are
have poor contact.
mounted. Check joints for good contact
to copper of board.
Figure 1-28. Troubleshooting Chart Vibration Meter Type 1-117-0105 (Sheet 2 of 3)
1-28
