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ALIGNMENT INSTRUCTIONS
PRE-ALIGNMENT INSTRUCTIONS
The high voltage lead should be securely taped and kept away from the chassis.
Allow a 20 minute warm-up period for the receiver and test equipment.
VIDEO IF ALIGNMENT
Connect the negative lead of a 1. 5 volt Was supply to point <A> . Positive to chassis.
Connect the negative lead of a 3 volt Was supply to point <3|> . Positive to chassis.
Connect the synchronized sweep voltage from the sweep generator to the horizontal input of the oscilloscope for horizontal deflection.
The Sweep Generator output lead should be terminated with its characteristic impedance, usually 50 ohms.
Use only enough Sweep Generator output to provide a usable pattern on scope.
Use 10MC sweep unless otherwise noted.
Detune Mixer Plate coil by turning core fully counter clockwise.
DUMMY
ANTENNA
. OOlmfd
Direct
SWEEP
GENERATOR
COUPLING
High side to pin 1 (grid)
of 6BZ6 (VI). Low side
to chassis.
"
Place a thin insulated
metal strip between the
Mixer -Osc. tube (V202),
and tube shield. Connect
the high side of Sweep
Generator to the metal
strip. Low side to chas-
sis.
SWEEP
GENERATOR
FREQUENCY
43. SMC
"
MARKER
GENERATOR
FREQUENCY
47. 25MC
42. 25MC
45.0MC
45. 75MC
47.25MC
41. 25 MC
41.25MC
42. 25MC
45. OMC
45. 75MC
CHANNEL
Any non-
interfering
channel
CONNECT
SCOPE
Vert. Amp. thru
10K to point <@> .
Low side to chassis.
(Across Video Det.
load).
"
ADJUST
Al, A2
A3, A4,
A5
A6
A 7 &
Mixer
Plate
CoU
REMARKS
Adjust to place marker in trap notch. If two
points are found to do this, use the one with
slug farthest counterclockwise.
Adjust for maximum gain and symmetry of
response similar to Fig. 1 with markers
as shown.
Adjust to place marker in trap notch. If two
points are found to do this, use one with
slug farthest counterclockwise.
Adjust for maximum gain and symmetry of
response similar to Fig. 1 with markers as
shown. Adjust Mixer Plate coll for maxi-
mum gain with 45. 75MC marker at 50%.
Adjust A7 for maximum gain and proper tilt.
Due to interaction it may be necessary to
repeat adjustment. Recheck step 3.
SOUND IF ALIGNMENT
Turn the Contrast control fully clockwise and A8 fully counter clockwise.
Tune in a strong TV signal (preferably with a tone signal or music). Adjust A8 just past the point of maximum sound and MINIMUM distortion.
Reduce the signal strength by disconnecting the antenna or connecting an adjustable attenuator between the antenna leads and the receiver
antenna terminals so that with the Volume control set fully clockwise the sound is at a low level.
Tune the Fine Tuning thru undistorted sound. Set the Fine Tuning to the verge of distortion.
Adjust A9, AID and All for MINIMUM distortion.
Readjust the Fine Tuning during adjustments of A9, A10 and All to keep it at the verge of distortion.
4. SMC TRAP ALIGNMENT
Tune in a TV station and turn the Fine Tuning slowly clockwise until 4. BMC beat interference becomes visible in the picture. Adjust A12
until the horizontal scanning lines are smooth and continuous.
•
TUNER ALIGNMENT INSTRUCTIONS LOCATED ON PAGE6.
F I G
PAGE 4
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