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BOONTON
RADIO
CORPORATION
TROUBLE SHOOTING
SECTION
V
TROUBLE
SHOOTING
GENERAL
PROCEDURE
The usual procedure of localizing trouble within
one of the circuits, then determining the component at
fault, is recommended in servicing this Generator. Fre-
quently, visual inspection alone will serve to locate
trouble. А Glide Slope receiver may be used to detect
the existence of rf output and modulation
if meter
circuits are not functioning.
The following chart is offered as a troubleshooting
guide, and while not all-inclusive, suggests a testing
sequence that should prove helpful. In the chart, test-
ing is grouped under logical circuit headings. It should
be borne in mind, however, that it is not always pos-
sible to treat each circuit group independently and that
in some cases there is interdependence between circuit
groups for proper overall functioning.
TEST
EQUIPMENT
REQUIRED
(a)
DC
Voltmeter
—
20,000
/volt —
or better
(Simpson 260, Jr. Volt-Ohmyst, etc.) .
(b)
AC Voltmeter — 500,000 impedance shunted
with 30uuf—or better (Ballantine 300, etc.).
TROUBLESHOOTING
CHART
(See photo illustrations for location of test points)
(All tests between test point specified and chassis)
POWER
SUPPLY
NORMAL
INDICATION
+360V D.C. (approx.) with
115V line input. (Varies with line
STEP
TEST
CONTROLS
NO.
POINT
SET AT
1
Pin 7 of V12
Power switch (S7) Oz
or V13
(546-As)
input voltage).
2
Pin 2 or Pin 5 Same as Step (1)
of V14
+260V DC. The normal adjustment
range of R108 is from approx. 200
(6AS7G)
to 320V DC. With B+ set to 260V
using R108, removal of V2
(Caution — This tube gets HOT
in normal operation)
(6005/6AQ5W ) should cause less
than 1 volt change of readings on
the voltmeter.
3
Pin 2 of RT2
Same as Step (1)
7V А.С. +.3V.
(16-4)
1000 —OSCILLATOR
4
End of R81
Power switch (S7) On
Approx. 13V А.С. (The normal
(68K 1W on
Mod switch (S5) set at 1000
adjustment range of R75 "1000 ~
sub-panel
Cal" is from 0 to 25 volts AC)
terminal
board)
nearest
Carrier
Monitor
Meter
90/150~
GENERATOR
5
90 ~
Power switch (S7) On.
6-8V AC
terminal on
Mod switch (S5) at
alternator TB
90/150—
DB Tone Ratio
switch (S6) at Cal 90——
6
731502
Same as Step (5)
6-8V AC
terminal on
alternator TB
ک
و
PROBABLE
CAUSE
OF MALFUNCTIONING
V12 ог V13 (546-As)
Malfunctioning may be caused by
either excessive drain, improper гер-
ulaton, ог both. Improper regulation
only at low line input voltage is
usually due to a weak 6AS7G
(V14).
Improper or no regulation at all line
inputs is probably due to a weak or
burned out GAUG
(V15).
If voltage 10% or more high—
Burned out tube or tubes in RF unit
(V3, 4, 5, 6,9 or 10). If below
6.7V, RT2 at end of useful life.
Badly deformed filament of RT2 also
indcates approach of end of useful life.
If adjustment range abnormal, КТІ
90 — section of alternator Gl
150 —
section of alternator Gl
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