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GENERAL
If the exciter has been properly tuned up,
output power in the
vicinity of 10 watts should be obtained.
If trouble is exper-
ienced along the way in the tune-up procedure,
the fault can
usually be isolated by referring to typical test point volt-
ages given on a following page.
There are five key test points
that are indicative of proper operation.
About
- 35
volts should be obtained at TP106, this indicates that
the pulse stages V101 thru V106 are properly operating.
àbout - 2 volts should be obtained at TP108,
this indicates
that V107 and associated circuitry is working O.K.
Approximately . 5 volts RMS RF voltage should be obtained at
TP113 and/or TP114,
this would indicate that the frequency mul-
tiplier stages V107 thru V111 are operating properly.
Around
- 7
volts should be obtained at TP118, this indicates
sufficient driving power to final amplifier stage V115.
If a defect is suspected, but can not be spotted,
checking re-
sistance of the various tuning coils L101 thru L115 may locate
the trouble.
The proper resistance value of these coils is listed below along
with the capacitor values for comparison purposes.
The measured
resistance should not deviate by more than about 10%.
If the
accuracy of the voltmeter is not knowea
s
a comparison between
similar coils can be made.
For example,
the resistance of L101,
L102 and L103 should be the same.
COIL
DC RESISTANCE
CONDENSEh V. LUE
.CiJOSS COIL
L101;L102,L103
21 ohms
150 mmf.
L104¡L105
9.6 ohms
100 mmf,
L106¡L107
5.5 ohms
24 mmf,
L108,L109
2.1 ohms
24 mmf.
L110,L111
1 ohm
See Schematic
L112,L114,L115
. 12 ohm
See Schematic
L113
. 43 ohm
gee Schematic
Considerable deviation of resistance from the above given values
indicate either the wrong coil,
shorted turns,
open turns,
or a
—7—
M6095 Exciter
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