Motorola 55C4 Service Manual - Page 3

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ALIGNMENT
Use an isolation transformer between the power line and
the receiver.
If not available, connect low side of genera¬
tor to ground (outer chassis edges) through a . 1 mf capaci¬
tor.
Connect a low range output meter across speaker voice
coil and set volume control to maximum.
Set signal generator output to produce .40 volts across
voice coil.
As stages are aligned, reduce generator output,
to maintain the .40 volt level to avoid overloading receiver.
STEP
DUMMY
ANTENNA
GENERATOR
CONNECTION
GENERATOR
FREQUENCY
(400 cycle mod)
GANG
SETTING
ADJUST
REMARKS
IF ALIGNMENT
1
.
. 1 mf
RF ALIGNMENT
. 1 mf
3
.
Grid of conVo
(pin 7,
12BE6)
Grid of conv0
(pin 7, 12BE6)
Radiation loop*
455 Kc
1620 Kc
1400 Kc
Fully open
Fully open
Tune for max
1, 2, 3 & 4
(IF cores)
5 (Osc)
6 (Ant)
Adjust for maximum.
Use
insulated screwdriver.
Adjust for maximum.
Adjust for maximum.
^Connect generator output across 5" diameter,. 5 turn loop and couple inductively to receiver loop.
Keep loops at least
12" apart.
ALIGNMENT DATA
Front
1620 Kc
1400 Kc
12BA6
R8
Power
Interlock
c
]—
R1
C
I
■
T
3
¥
J
gsa
\
50C5
»e ■
• _
.
.
___