
 ( 3 ) For tuning unit 4, take measure
68. Dc Resistances of Tuning Unit
ments with FREQUENCY RANGE
Multi pin Connectors
MC switch S503 at the 400700mc
a. General. A convenient set of test
position.
p o i n t s for resist a n c e measurements
N o t e : For tuning unit 3, take measure
i s accessible at the rear of each tuning
ments at any frequency dial indication.
b. Chart of Resistance Measurements.
tuning unit r e m o v e d from the tuning
The chart below lists the resistance meas
u n i t compartment of the main unit, the
u r e m e n t s at multipin connectors at the
m u 1 t i p i n connector permits a check
rear of the tuning units under the following
out of 20 circuit points. M a k e measure
conditions:
ments from each terminal of the connector
(1) The tuning unit removed from main
to tuning chassis ground. In a d d i t i o n
unit.
t o the general conditions of measurement
(2) T h e t e s t h a r n e s s d i s c o n n e c t e d
s h o w n in the chart below, set the band
f r o m receptacle at rear of tuning
switch on the applicable tuning unit as fol
unit .
lows :
( 1 ) For tuning unit 1, take measure
(3) The GAIN and SLIDE BACK con
m e n t s with MEGACYCLES band
t r o l s in extreme counterclockwise
s w i t c h S1 at the .15 .36 (band 1)
position.
position.
(4) All measurements taken from des
( 2 ) For tuning unit 2, take measure
ignated terminal to tuning unit
ments with FREQUENCY RANGE
c h a s s i s ground.
M C switch S201 at the 2070mc
(5) The mating pin numbers for tuning
position.
units 1 through 4 indicated on P1.
Resistance (ohms)
Terminal
P401 (fig. 68)
P201 (fig. 64)
P501 (fig. 72)
P1 (fig. 56)
(Tuning unit 4)
(Tuning unit 3)
(Tuning unit 2)
(Tuning unit 1)
Infinity
Infinity
Infinity
A1
Infinity
0
0
0
A2
0.8
50K
50 K
55K
1
38K
Infinity
Infinity
2
6K
Infinity
Infinity
Infinity
Iinfinity
3
Infinity
0
0
0
4
0
Infinity
Infinity
Infinity
Infinity
5
Infinity
Infinity
Infinity
6
Infinity
Infinity
Infinity
Infinity
7
Infinity
Infinity
Infinity
Infinity
8
Infinity
Infinity
Infinity
Infinity
9
Infinity
Infinity
Infinity
Infinity
Infinity
10
Infinity
Infinity
Infinity
Infinity
11
Infinity
Infinity
Infinity
Infinity
12
0
0
0
0
13
30K
30K
30 K
14
30K
30K
30K
30K
15
30K
0.8
0.8
0.8
16
1.8
0.8
0.8
1.6
0.8
17
320
310
320
18
320
formers mounted in the various if. pre
69. Dc Resistances of Transformers
amplifier and if. amplifier subassemblies
and Coils
do not have terminal numbers stamped on
t h e phenolic wafer at the bottom of the
f o r m e r windings and coils is listed in c
s h i e l d can. Therefore, reference must be
below.
made to figure 77 for identifying which
b. Key to Identifying Terminals on If.
terminals are for the primary winding and
152

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