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TV ALIGNMENT INSTRUCTIONS
ALIGNMENT INSTRUCTIONS-READ
CAREFULLY BEFORE ATTEMPTING ALIGNMENT
If receiver Is to be aligned with picture tube removed, it Is recommended to also remove the 6SN7GT (V15) hori-
zontal oscillator tube to eliminate high voltage shock hazard.
When complete alignment Is to be performed, It can most conveniently be done In the order outlined;
SOUND IF ALIGNMENT USING
DUMMY
ANTENNA
.05MFD
.05MFD
.05MFD
SIGNAL
GENERATOR
COUPLING
High side to pin 1
(Grid) of 6AU6 (V10)
Low side to chassis,
n
High side to pin 1
(Grid) of 6BA6 (V9).
Low side to chassis.
SIGNAL
GENERATOR
FREQUENCY
21.25MC
(Uranod.)
"
"
CHANNEL
13
n
n
AM SIGNAL GENERATOR AND VTVM
CONNECT
VTVM
DC Probe thru 1
Meg to Polnt^
Common to chassis.
DC Probe thru 1
Meg to Point<E»
Common to chassis,
DC Probe thru.J.
Meg to Point <£>
Common to chassis.
ADJUST
A1.A2
Al
A3,A4
SOUND IF ALIGNMENT USING FM SIGNAL GENERATOR
Connect the synchronized sweep voltage from the signal
for horizontal deflection.
DUMMY
ANTENNA
.05MFD
.05MFD
SWEEP
GENERATOR
COUPLING
High side to pin 1
(Grid) of 6BA6
(V9). Low side to
chass Is .
n
SWEEP
GENERATOR
FREQUENCY
21.25MC
(IMC
Sweep )
n
MARKER
GENERATOR
FREQUENCY
21.25MC
n
CHANNEL
13
it
REMARKS
Detune Al. Adjust A2 for maximum deflection.
Adjust for zero reading. A positive and
negative reading will be obtained on either
side of the correct setting.
Adjust for maximum deflection.
AND OSCILLOSCOPE
generator to the horizontal Input of the oscilloscope
CONNECT
SCOPE
Vert. Amp. to
Polnt«a Low
side to chassis.
Vert. Ami. to
Polnt^p Low
side to chassis.
ADJUST
A3,A4
A1.A2
VIDEO IF ALIGNMENT
REMARKS
If 60% sweep rate Is used shunt R50
with 5600S. Adjust A3 and A4 for
maximum amplitude and symmetry as
per Fig 1.
Adjust A2 for maximum amplitude
and stralghtness of diagonal line
as per Fig 2.
Adjust Al so 21.25M2
marker is at center of diagonal
line. Continue with step 4.
Before starting video IF alignment connect VTVM between Junction of R25 and R26 and chassis. Adjust contrast
control to give VTVM reading of -3V. Leave contrast control at this setting for entire video IF alignment.
Remove 6J6 local oscillator tube V3 to prevent erroneous Indications.
DUMMY
ANTENNA
SIGNAL
GENERATOR
COUPLING
High side to un-
grounded tube
shield floating
over mixer tube
(V2). Low side to
chassis.
n
it
n
n
»
SIGNAL
GENERATOR
FREQUENCY
21.25MC
27.25MC
22. SMC
23.9MC
26.0MC
24. SMC
CHANNEL
13
"
n
"
It
"
CONNECT
VTVM
DC Probe to Point
GJ>
Common to
Chassis.
"
"
it
»
n
ADJUST
A5,A6
A7
AS
A9
AID
All
REMARKS
Adjust for minimum deflection.
Adjust for minimum delfectlon.
(Some
models may not have this trap.)
Adjust for maximum deflection.
n
n
II
n
n
it
II
n
n
n
n
OVERALL VIDEO IF RESPONSE CHECK
Connect the synchronized sweep voltage from the signal generator to the horizontal Input of the oscilloscope
for horizontal deflection.
DUMMY
ANTENNA
SWEEP
GENERATOR
COUPLING
High side to un-
grounded tube
shield floating
over mixer tube
(V2). Low side to
chassis .
SWEEP
GENERATOR
FREQUENCY
24MC
(10MC
Sweep)
MARKER
GENERATOR
FREQUENCY
21.25MC
23. CMC
25.0MC
25.75MC
27.25MC
CHANNEL
13
CONNECT
SCOPE
Vert . Amp . to
Point <^> Low
side to chassis.
ADJUST
REMARKS
Check response curve obtained on
scope.
If necessary., slightly re-
touch A5 thru All for proper wave
shape and placement of markers as
per Fig 3.
1.
2.
3.
1.
2.
4.
5.
6.
7.
10.
RF AMP. 8. MIXER ALIGNMENT
i
Before starting RF alignment connect VTVM to junction of R25 and R26 and chassis and adjust contrast control
to give VTVM reading of -IV. Leave contrast control at this setting for entire RF alignment.
Connect a 1000MMFD capacitor from pin 1 of 6AG5 1st Video IF Amp (V4) to chassis.
DUMMY
ANTENNA
Two 120S
carbon
res.
n
SWEEP
GENERATOR
COUPLING
Across antenna ter-
minals with 1202
resistor In each
generator lead.
"
SWEEP
GENERATOR
FREQUENCY
177MC
(ion;
Sweep)
183M3
(10MC
Sweep)
189M3
(10MC
Sweep)
195MC
(10MC
Sweep)
201MC
(10MC
Sweep)
207fC
(10MC
Sweep)
213MC
(10MC
Sweep)
MARKER
GENERATOR
FREQUENCY
175.25MC
179.75MC
181.25M3
185.75MC
187.25MC
191.75MC
193.25MC
197.75M3
199.25MC
203.7SMC
205.25MC
209.75MC
211.25MC
215.75MC
CHANNEL
'
8
9
10
11
12
13
CONNECT
SCOPE
Vert . Amp . thru
10KS2 to Point
<!fft Low side to
chassis .
n
ADJUST
A13,A13
A14,A15
REMARKS
Adjust for approximately flat top-
ped response curve as per Fig 4.
Markers must be above 705S. Keep
slug pairs in same relative posi-
tions.
Check to see that response is as
above. Slight readjustment of A12,
A13,A14,A15 may be necessary to
obtain optimum response for all
high band channels.
12.
PAGE 6
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