Motorola ts 921 b service manual

Page 1

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MOTOROLA COLOR TV CHASSIS TS-9213-00 81 C-00, 81 MTS-921

Page 2

Sheet 68P65129A40-C

MOTOROLA TV COLOR CHASSIS TS-921 SERIES

THIS SERVICE INFORMATION IS FORTTHE USE OF QUALIFIED SERVICE PERSONNEL ONLY

INSTALLATION AND SERVICE ADJUSTMENTS

ON SCHEMATIC DIAGRAM.

NOTE: DO NOT OPERATE CHASSIS WITH CONVERGENCE PLUG REMOVED FROM CONVERGENCE PANEL
UNLESS THE +300V PP PULSE SOURCE HAS BEEN DISCONNECTED. SEE CONVERGENCE PANEL DETAIL

AUTOMATIC DEGAUSSER

This receiver Is equipped with an auto-
matic built-In degaussar. It Is a tempera-
ture controlled unit and Is activated each
time the receiver ls turned on. The degaus-
sing action takes place within the first 10
seconds after the receiver is turned on
and before the picture comes on. The
degausslng action cannot be seen. To de<
gauss after the receiver has been on and
has reached ltsmaxlmum operating tem-
perature, it will be necessary to turn the
receiver off and allow It to cool for approxlr
mataly 5 minutes. If the receiver has been
on for only a few minutes. then the re-
qulred cooling period Is reduced.

Upon Initial Installation. we suggest you
degauss the entire receiver and picture
tube with a conventional portable degaus-
sing coll.

FOCUSING ADJUSTMENT

Set brightness and contrast for normal
picture. Then adjust focus control (located
on chassis) for best overall focus. center
to edge efrscreen.

DEFLECT ION YOKE

TILT ADJUSTMENT

Loosen the yoke retainer clamp and rotate
yoke untll picture Is straight. Do not
slide yoke forward or backwards on the
neck of the tube as purity will be affected.
Tighten the clamp screws when adjust-
ment is completed.

PICTURE CENTERING
Vertical and horizontal centering controls
are located on the rear of the chassis.

NOTE: Large control excursions will affect
convergence.

COLOR KILLER

Tune in black and white picture. Starting
with control in full clockwise position.
when viewed from rear'of receiver. turn
control counter-clockwise slowly until color
noise or snow disappears. Check all chan-
nels. If noise or snow remains on with a
black and white picture. continue turning
control counter-clockwise. Check setting
when tuned to a color signal to make sure
It was not overladjustad on the black and
wlhlte. signal. tneraby killing the color
5 ans .

VERTICAL SIZE 8- LINEARITV

Both vertical size and linearity controls are
located on the back of the chassis. Slight
adjustments can be made with the vertical
size control without affecting vertical line-
arlty. Large control excursions should only
be made prior to convergence.

HIGH VOLTAGE ADJUSTMENT

Reduce brightness control to minimum,

full counter-clockwise (adjust master 6-1.
If necessary. to extinguish raster).

Measure the high voltage at the 2nd anode
with an accurately calibrated BOKV volt-
meter. Adjust horizontal blas control lo-
cated at rear of chassis for 27KV 2nd
anode voltage.

Alternate Method

Reduce brightness control to minimum,
full counter-clockwise (adjust master Gil.
If necessary. to extinguish raster).

With 120V Ac line voltage. adlust horizon-
tal bias control until 690V Dc Is measured
at the raw boost terminal, see Figure A.

tilllil VOLTAGE
CAD!

/ RAw
an sr

IAcKorcMssls
FIGURE A. RAW BOOST LOCATION

FINE TUNING ADJUSTMENT
This receiver employs a VHF tuner
with a concentric pre-set fine tuning
mechanism.

Rotating the fine tuning knob in either
direction automatically engages the fine
tuning mechanism and automatically dls-
engegas when knob ls released.

To fine tune. rotate fine tuning knob in
either direction for best picture and
sound.

I'INCUSHION ADJ. INSTRUCTIONS
VERTICAL: Adjust bottom amplitude con-
trol R-709 for minimum correction (maxi-
mum clookwlse). then adjust top tilt coll
LJDO for the strelghtest line possible
near the top of screen. (Figure 1),

LIIIII loP TILI
COIL

Rm Biii'iflM AMPLITUDE
CONTROL

FIGURE I.

Adjust R~709 for the straightest llne pos-
sible near th'e bottom of the screen.

HORIZONTAL: Adjust horizontal control
R-725 for optimum correction at left side
of raster. Observe right side simultane-
ously, over correcting left side may cause
barrellng at right side of raster.

HORIZONTAL HOLD ADJUSTMENT
(L-SOO)

Adjust the horizontal hold on the rear of
the cabinet for most stable horizontal and
color sync while switching from channel
to channel.

AGC ADJUSTMENT

NOTE: AGC control ls accurately adjusted
at the factory. Avoid unnecessary adjust-
ment.

To adjust. tune In a channel for best pic-
ture and sound. Turn the AGC control
counter-clockwise (when viewed from rear
of receiver) until the picture becomes un-
stable (rolls down or slips. etc). Then. turn
control clockwise until the picture returns
to normal. Check all channels: If any are
unstable. continue turning control clock-
wise until the pictura ls normal on all
channels.

VIDEO PEAKING CONTROL

The video peaking control should normally
be set In maximum clockwise position for
optimum video response. If high frequency
background noise Is visible on CRT. turn
video peaking control counterclockwise to
eliminate the background noise.

NOISE GATE CONTROL

The noise gate control ls used to adjust
the receiver for best hold stability under
noise and different signal strength condi-
tlons.

To adjust. tuna In a channel for best
picture and sound. Turn the noise gate
control clockwise (when vlewed from rear
of receiver) until the picture becomes un-
stable (rolls down or slips, etc). Then
turn control counter-clockwise until the
picture just returns to normal. Check all
channels; If any are unstable. continua
turning control counterclockwise until the
picture Is just normal on all channels.

TINT CONTROL

The tlnt control serves a dual pur ose on
black and white. it is normallyp set to
approximately the center of Its range. On
color programs. it is adjusted toward the

right (clockwise) position for best flesh
tones.

FTI (FINE TUNING INDICATOR) ADJUSTMENT PROCEDURE

NOTE: AGC control must be adjusted
properly before making any
adjustments of FTl light.

ALIGNMENT PROCEDURE

1. Tune In color program; use channel
with the shortest fine tuning range.
Adjust fine tuning (clockwise) until
sound bars appear In picture. then

counter-clockwise for best picture
data".

2. If light remains on, adjust HEP
(sensitivity control) counter-clockwise
for minimum brilliance (If light goes
out, proceed with Step 3). If lIghtjust
dime, align LIP until light goes out.

3. Fine tune toward smear.
counter-clockwise. Light should remain

off for not more than one half (180
degrees) turn.

4. Adjust sensitivity control (REF)
until FTI light goes out, If necessary.

5. Check all local stations for proper
FTI Iloht operation. Repeat Step 1
through 4 for FTI indicator light off
between color drop out and sound In
Picture on each station.

AFC & FTI (FINE TUNING INDICATOR) ADJUSTMENT PROCEDURE

AFC LOCK OPERATION

The FTL is activated by the 45.75Mc
carrier In the video IF. The 45,75Mc
carrier ls amplified and fed to a
discrlmlnator transformer tuned to the
center frequency of 45.75Mc. Two (2)
diodes In the secondary of the
discriminator rectify this signal and
provide a DC voltage relative to any
frequency changes produced by the
variation of the 45.75Mc carrlsr. This
DC change ls fed to a varector In the
local oscillator In the tuner. The
resultant DC correction voltage shifts
the oscillator frequency as necessary to
maintain the video carrier (45.75Mc) at
its proper fine tuned position with
respect to the video IF response.

AFC ADJUSTMENT PROCEDURE

check operation of the AFC as
follows: Defeat AFC by pulling out on
the VHF fine tune knob. Fine tune to
a station for best color picture. FTI
(fine tune Indicator) light should be
out Indicating receiver ls properly fine
tuned. Push In fine tune knob to
activate AFC circuit. FTI Ilght should
remain off. If the light comes on when
AFC Is activated, make adjustments as
follows:

1. Defeat AFC by pulling VHF fine
tuning knob outward.

2. Connect VTVM across terminals A
and E (yellow and blue wires). See
detail for terminal location. Adjust

meter for zero oanter scale.
NOTE: Negative lead of VTVM must
be Isolated from mater case.

3. Push In the VHF fine tune knob to
activate AFC.

4. Turn the top core of discriminator
(T1T) out to top of transformer. Turn
the bottom core of discriminator
(T1T) down to bottom of transformer.

5. Detuna FTI coll. Turn core almost
out of coll.

6. Adjust bottom core for maximum
(first peak) meter deflection and adjust
top core for zero center scale reading.
Repeat as necessary.

7. Connect VTVM to pin 2 of plug
(white wire), mater ground to chassis.
Adjust FTI coll for minimum reading
with AFC activated. Check operation
and adjust if necessary as described In
the FTI Adjustment Procedure.

FTI (FINE TUNING INDICATOR).
LIGHT ADJUSTMENT

The FTI light ls activated by the
45.75Mc carrier In the video IF. The
FTI circuit is tuned to 45.75Mc. When
the receiver is correctly tuned to a
station, a portion of the 45.75Mc
carrier is detected and filtered. This DC
voltage Is used to turn on the FTI

amplifiers which turn off the FTI light.
When functioning properly, the FTI
light goes out when the receiver la
tuned for best picture; no Interference
(920Kc beat, etc.) ls visible In picture.

FTI ADJUSTMENT PROCEDURE

NOTE: AGC control and AFC module
must be adjusted properly before
making any adjustments of FTI light.

1. Tune in color program: use highest
channel available. Adjust fine tuning
(clockwise) until sound bars appear ln
picture, then counter-clockwise for
best picture detail.

2. If light remain on, adjust H12P
(sensitivity control) counter-clockwise
for minimum brilliance (If light goes
out, proceed with Step 3). If Ilghtjust
dlms, allgn L1T until light goes out.

:I. Fine tuna toward smear,
counter-clockwise. Light should remain
off for not more than one half (180,
degrees) turn from light on In burble.

4. Adjust sensitivity control (R12F)
untll FTI light; goes out, If necessary.

5. Check all local stations for proper
FTI light operation. Repeat Step 1
through 4 If the FTI light Is not off
between color drop out and sound in
picture on each station.

GENERAL CONVERGENCE
PROCEDURE

The following eight steps outline, in gen-
eral, the complete step by step con-
vergence procedure that follows:

1. Demagnetize shadow mask with de-
gaussing coil.

2. DC converge all three colors In cen-
ter area of screen.

3. Adjust purity ring for center screen
area red. adjust yoke position for outer
area red.

4. Set tint control to its mechanical
.. center and set black and while back-
1 ground tracking.

5. Properly center and size picture.

. 6. Dynamically converge all three colors.
9 7. Recheck Steps #2 and #3.
8. Repeat Step #4.

PRELIMINARY PURITY
ADJUSTMENTS

1. Connect crosshatch generator to an.
tenna terminals and fine tune_for best
picture. Set brightness and contrast to
normal.

2. Convergence panel is accessible from
the frontof receiver and is located be-
hind removcable panel (see Figure 3).

3. Check adjustment of vertical size and
linearity. vertical centering, horizontal
centering. center of screen focus and
then adjust controls if necessary to ob-
tain a pattern of proper focus. size and
location (see Figure 4).

4. Demagnetlze receiver (use degaus

FIGURE 1. STATIC CONVERGENCE

sing coil around front and all sides of
CRT).

5. Turn color intensity control to mini-
mum. Adjust red and green dlsc mag-
nets for super-imposed red and green
pattern at the center of the screen (see
Figure 2).

6. Adjust blue disc magnet and blue
lateral magnet to place the blue pattern
on top of the red and green patterns
(see Figure 2).

These preliminary adjustments are net;-
assary-to have the three beams InthEll'
approximate positions before purity Is
adjusted.

PURITY

1. Tune receiver to a blank channel or
crosshatch generator pattern having a
white background. A white noise free
raster can be obtained by setting tuner
between channels.

2. Set contrast to minimum. brightness
to normal level and tint control to Its
mechanical center (see Figure 3).

3. Turn blue and green G-Z controls to
minimum and red 6-2 to maXImum (see
Figure 3).

4. Move yoke as far back (or forward,
whichever is applicable) as possubie.

5. Starting with the colored or same
shaped tabs on the purity ring together
(see Figure 5), spread them slowly and
rotate the purity ring as a unit to place
the red area at the center of screen.

6. Slide yoke forward and position for
best overall rcd field. Usually. it is not
necessary to slide yoke against the CRT
hell.

7. Level deflection yoke and tighten

yoke clamps.

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PURITY AND CONVERGENCE PROCEDURE

8. Check the purity of the blue and
green fields by turning down the red 8-2
and turning up the blue and groan G-z
controls in turn. Normally. when red
field purity Is obtained. the green and
blue fields are also pure. If either .of
the fields show Impurity. adjust purity
ring and/or yoke and than rachec the
other two fields.

PRELIMINARY CONVERGENCE &
BACKGROUND ADJUSTMENTS

When adjusting the set-up controls, the
G-2 controls are adjusted to make the
three beams extinguish at the same time
(white raster at low brightness). The
video drive controls are adjusted for a
white raster at high brightness levels.
The CRT should then remain white be-
tween these two extreme brightness set-
tings.

NOTE: The tlnt control should change the
white raster from red to white to blue.

1. Sat drive controls to mid-position
and set tint control to mid-position (see
Figure 4).

2. Set master G-l control to minimum.

3. Tune receiver to a blank channel and
set contrast to minimum.

4. Adjust all G-Z controls to maximum
(iully right).

5. Adjust BRIGHTNESS control until the
raster is just visible (adjust master G-l,
if necessary, to see raster).

6. Observe color of raster and reduce
the 6-2 controls of the predominant
colors. The 92 control for the weakest
color should be left at maximum, then
bring other controls up to produce a
gray raster.

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7. Advance BRIGHTNESS control to
maximum (clockwise) and contrast con-
trol to minimum (counter-clockwise).
Set tuner between channels.

8. Set line voltage at 120V AC. Measure
voltage at boost terminal. Figure A.
Starting with master (3-1 at minimum
(counter-clockwISE). adjust master 6-].
for a 40 volt DC drop in boost.

Alternate Method

Set BRIGHTNESS control to maximum
(clockwise) position and contrast con-
trol to minimum (counter-clockwise)
position. Starting with the master G-l
control in its maximum counter-clock-
wise position. slowly rotate the master
G-1 control until the picture just STARTS
to go out of focus. Then turn the con-
trol back approximately 45".

9. Reduce BRIGHTNESS control to nor-
mal brightness and check color of screen.
If screen is white or gray (with tint con-
trol In Its mid-position). set-up proce-
dure is completed. If any color ls
dominant, proceed with Step #10.

10. Touch-up video drive controls. If
necessary, to produce a warm white
raster.

11, Reduce BRIGHTNESS to gray raster
and touch-up 62 controls. if necessary.

A. STATIC CONVERGENCE

1. Tune receiver to a white crosshatch
and adjust for best picture.

2. ReAcheck center of screen, focus. pic-
ture size. linearity and centering: cor-
rect If necessary.

3. Adjust the three disc magnets and
the blue lateral magnet for convergence
of all three beams at the center of the
screen (see Figure 5).

B. DYNAMIC CONVERGENCE

NOTE: On some receivers the sequence
of the convergence procedure noted on
the convergence panel may differ from
procedure outlined herein. If so. follow
this procedure. Use control identification
rather than number sequence. Control
location is Identical.

Vertical Dynamics

NOTE: If a chassis is being converged
for the first time, after a CRT has been
replaced or if a component that directly
effects dynamic convergence ls replaced.
switches E-701 and E-702 (located ad<
iacent to convergence panel) should be
set In normal position. The normal posi-
tion of switch on chassis CZBTS-921 is
down. For chassis 20TS-921, normal
position is left. See Figure 6 for switch
locations. /-

The arrows shown on the convergence
panel diagram indicate the normal move-
ment of the converging lines with asso-
ciated controls.

Obtain a red-green raster by turning
blue 6-2 to minimum. Use Figure 6,
the convergence panel diagram, and ob-
serve the affect as illustrated at each
control.

1. Adjust R-G vertical am iltude to con-
verge the center vertical ine at bottom
of screen (step #1).

2. Adjust R-G vertical tilt to converge
the center vertical line at top of screen
(Step #2).

NOTE: If the range of the RG vertical
amplitude and tilt controls is inadequate.
set slide switch E-701 in "up position
on chassis 623T8-921 and to the right
on chassis 20TS-921. See Figure 6 for
location.

Alternateiy repeat Steps #1 and #2 for
best convergence at top and bottom of
center vertical line. Best convergence is
obtained by super-imposing the lines
from the center outward. However, the
proper adjustment of these controls may
result in the red and groan lines being
parallel. If this condition exists. con-
verge the lines by using the disc mag-
ne 5.

3. Adiust tho R-G vertical differential

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ASSEMBIING CRT:
I. INSTALL DEFLECTION YOKE AGAINST BILL OF CRT
2. INSTALL CONVERGENCE VDKE AS SHOWN IN INSERT
3. INSTALL BLUL LATERAL E PURITY RING ASSEM
AGAINST CONVERGENCE YOKE

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DEFLECTIDN VOKE

FIGURE 5. COLOR TUBE ASSEMBLY

R4 1.2K
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R5 22K

FIGURE 4. REAR VIEW OF CHASSIS

STATIC CONV

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a a horizon-
the screen

amplitude control to conve
tal line near the bottom a
(Step #3).

4. Adjust the R-G vertical differential tilt
to converge a horizontal line near the
top of the screen (8th #4).

If the horizontal lines In the center of
the screen are misconvergcd. repeat
Steps #3 and #4 for equally spaced
horizontal lines from top to bottom of
screen. Raadjusl: disc magnets if nec-
essary. Readjust the R-G vertical ampli-
tude and tilt controls (Ste 5 #1 and
#2) for center veltlcal lines, i necessary.

Horizontal Dynamics

Turn off the blue G-2 leaving the red
and green fields on the screen.

5. Adjust the right-side R-G vertical line
control to make the vertical lines from
the center to the right side converge
(Step #5).

6. Adjust the left-side R-G vertical line
control to make the vertical lines from
the center to the left side converge
(Step #6).

Re-touch the right and left R-G vertical
line controls for best overall converg-
ence of the vertical lines or for an error
that lends itself to correction by the
disc magnet.

7. Pre-adjust R-G differential tilt control
(#8) to center of range. Adjust hori-
zontal line control (#7) to make R-G
center lines converge. Any remaining
displacement at either side of the screen
should be equal and exist in the same
direction.

8. Adjust horizontal differential tilt con-
trol to make the center horizontal R at G
lines converge In the center of the
screen or be equal in displacement to
permit convergence with the disc mag-
nets. It may be necessary to readjust
between Steps #7 and #8 to completely
converge center line across the screen.

Repeat Steps #5. #5. #7 and #8 for
best overall convergence. or for equal
spacing of lines which Can be corrected
with the disc magnets.

9. Turn up the blue (32 control. The
blue horizontal amplitude control which
.is also used In Step #12 must first be
adjusted to maximum clockwise rotation
(Step #9).

10. Adjust the blue horizontal tilt con-
trol until the droop In the blue line is
in the center of the screen (Step #10).

11. Adjust the blue horizontal phase
until the droop in the blue is forced up-
ward (Step #11).

12. Re-adjust blue horizontal amplitude
control until blue line ls converged on
R-G line along a center horizontal line
or for equal displacement to permit
convergence with the disc magnets
(Step 12).

NOTE: If the displacement of the blue
line is not equal on both ends with re-
spect to RAG ilna. readjust blue hori-
zontal tilt control (Step #10).

Repeat Steps #10, #11 and #12, If nec-
essary, to get a satisfactory converg-
ence along a center horizontal line or
to get equal displacement to permit
correction with the disc magnets.

Blue Vertical Dynamics

13. Turn up the blue G-Z control and
reduce the bluevvertlcal amplitude to
minimum (Step #13).

14. Observe #13 and adjust the blue
vertical tilt control (#14) to reduce
equal displacement in the same Irectlon
of the blue horizontal lines with respect
to red and green at the top and the bot-
tom of screen.

Observe #14 and adjust the blue vertical
amplitude (#13) to converge blue with
R-G at top. center and bottom of the
screen.

NOTE: If the range of the blue vertical
amplitude and tilt controls is Inadequate,
set slide switch E-702 In up" posmon
on chassis 023TS-921 and to the right
on chassis 20TS-921. See Figure 6 for
location.

Alternately repeat Steps #13 and #14
for satisfactory convergence oi the blue
horizontal lines from top to bottom of
screen along the center of screen, or

R-G
E-70l RANGE

SEE NOTE

SW LOCATION IN
CHASSIS 20TS-921

SWI'lCl-I IN step 14
IN STEP 2H /\ /
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for equal displacement to permit cori-
vergence with the disc magnets as shown
in Step #14.

NOTE: If the displacement of the blue
line is not equal on both ends with re-
spect to RC line, readjust blue horizon-
tal tilt control (Step #10).

Repeat Steps #10. #11 and #12, if nec-
essary, to get a satisfactory convergence
along a center horizontal line or to gel:
aqua displacement to permit correction
with the disc magnets.

15. ReAchcck disc magnets.
tern should now be converged.

The 6-2 controls should now be reset
for a white background. Generally, since
the blue 6-2 Is the only one disturbed.
It is possible to set this control at Its
proper adjustment at low brightness
whlla observing a local station.

IF THE PURITY RING IS RE-ADJUSTED
FOR ANY REASON, THE ENTIRE CON-
¥E§$EOICE PROCEDURE MUST RE RE-

The pat-

E-702
SEE NOTE

HORIZONTAL
E-702
SEE NOTE
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