Table of Contents
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I.
Model 606A
Section IV
Paragraphs 4-27 to 4-34
Table 4-4. Typical Voltage
(1)
Oscillator and Amplifier Current Output
1 Volt into 50 Ohms, CW
FREQ.
6
()
l
o
( 2)
e
go
V2 pin
2, 7
e0
N'2 pin
1 or 6
e
ko
ÔC4/
C5
l
a
(3)
e
ga
V3 or 4
pin 2
e
pa
V3 or 4
pin 6
e
ka
@,C14/
C15
e
out
term.
(5)
e
fb
term.
(4)
l
k
12B4
V6
pin 1
94 KC
1.3 ma
7.1 y
92 y
209 v
5.7 ma
7.1 y
9.3 y
58 y
2.0 y
5.5 y
19 ma
310 KC
2.8
7.0
70
150
4.9
7.1
9.8
31
2.0
5.3
19
1 MC
4.8
5.9
130
130
6.4
5.9
7.8
19
2.0
5.7
19
3.33 MC
5.3
6.7
93
93
7.6
6.8
19
19
2.0
5.5
26
10.9 MC
4.6
6.9
55
55
4.0
6.85
15.5
15.5
2.0
5.5
17
36.3 MC
14.0
6.6
24.5
25
9.4
5.3
6.8
6.8
2.0
5.5
26
Notes:
Explanation of symbols:
(1) Measured by DC VTVM. such as ii Model 410B
e = voltage
(2) Measured by
e
Model 428A Clip- On N1illiammeter at red- green wire
I = current
loop between B+ and R9 ( beneath rf oscillator stator turret contacts),
g = grid
(3) Measured by '.e
.
, Model 428A Clip- On Milliammeter at red- green wire loop
o = oscillator
between B+ and R15 ( beneath rf amplifier stator turret contacts).
k = cathode
(4) Feedback voltage terminal ( 4) next to diode detector CR2.
a = amplifier
(5) Output voltage terminal ( 5) next to generator terminating resistor, R18.
f = filament
(6) Leave dial set at 1 N1C, rotate range switch only to desired band.
p = plate
4-27. TURN- ON PROCEDURE AFTER REPAIR.
4-28. Be sure to check for shorts in tuning capaci-
tors C4 and C5, C14 and C15 with an ohmmeter after
repair and before turning on the instrument. Solder
splashes may occur which short these capacitors
when repairing other parts of the instrument.
If the
instrument is turned on with these capacitors shorted,
resistors R9 or R15 may be damaged.
4-29. MECHANICAL
ADJUSTMENT OF
METER
ZERO.
4-30. When meter is properly zero- set, pointer rests
over the zero calibration mark on the meter scale
when instrument is:
1) at normal operating temper-
ature,
2) in its normal operating position, and 3)
turned off.
Zero- set as follows to obtain best accu-
racy and mechanical stability:
a. Allow the instrument to operate for at least 20
minutes; this allows meter movement to reach normal
operating temperature.
b. Turn instrument off and allow 30 seconds for
all capacitors to discharge.
c. Rotate mechanical zero- adjustment screw clock-
wise until meter pointer is to left of zero and moving
upscale toward zero.
d. Continue to rotate adjustment screw clockwise;
stop when pointer is right on zero.
If pointer over-
-
a
-
Tots zero, repeat steps c and d.
00170-2
e. When pointer is exactly on zero, rotate adjust-
ment screw approximately 15 degrees counterclock-
wise.
This is enough to free adjustment screw from
the meter suspension.
If pointer moves during this
step you must repeat steps c through e.
4-31. GENERAL TEST
AND
ALIGNMENT.
4-32. Usually the instrument will not need complete
test and adjustment.
This is particularly true when
repair has been accomplished without changing any
internal adjustments.
BEFORE MAKING ANY IN-
TERNAL
ADJUSTMENTS,
SEE PARAGRAPH 4-7.
If unnecessary adjustments are eliminated you will
often save time by being able tofinish a repair without
completing the entire test and adjustment procedure.
4-33. The procedures are listed in a recommended
sequence for a complete test and adjustment oper-
ation,
Test instrument recommendations are given
in paragraph 4-5.
The test frequencies and voltages
are based upon the use of these recommended instru-
ments.
If other equipment is substituted, you may
have to alter the procedures accordingly.
When other
equipment or methods are used, it is important to
select components and techniques which have equal
or greater accuracy. Any instrument can be adjusted
for optimum performance at a particular frequency
or
voltage,
or
the
most
commonly
used
range.
4-34. The specifications for the Model 606A are given
in the front of this manual. The test procedures con-
tain extra checks to help you analyze the instrument.
These extra checks and the data they include are not
to be considered as specifications.
4-9
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