Sharp 21N52-E1 User manual

SHARP
SERVICE MANUAL
S90M621 N52E11
21 SYSTEM
COLOUR TELEVISION
Chassis No. 2IA- M
MODEL 21N52-E1
In the interests of user-safety (Required by safety regulations in some countries ) the set should be
restored to its original condition and only parts identical to those specified should be used.
ELECTRICAL SPECIFICATIONS
Power Input
................................ 110-240VAC
50/60Hz (Auto)
Power Consumption
................................. 107w
Convergence
..................
Self Converging System
Focus
......
Bi-Potential, Uni-Potential Electrostatic
Sweep Deflection ................................
Magnetic
Intermediate Frequencies
Picture IF Carrier
................................
38.9M Hz
Sound IF Carrier
6.5MHz ......................................... 32.4MHz
6.0MHz ......................................... . 32.9MHz
5.5MHz .........................................
. 33.4MHz
4.5MHz .........................................
.
34.4MHz
Colour Sub-Carrier
PAL/NTSC
.....................................
34.47M Hz
SECAM ............................ 34.494/34.65MHz
NTSC
............................................ 35.32MHz
Audio Power Output Rating
........
2.5W x 2 (Max.)
Speaker
Size .............................
.
8cm x 4cm Oval x 2 pcs
Voice Coil Impedance
.............
8 ohms at 400 Hz
Specifications are subject to change without prior
notice.
Aerial Input Impedance ,......, 75 ohm Unbalanced
Receiving Channels
PAL-B/G, SECAM-B/G
VHF
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
E2 thru
El2
UHF
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21 thru 69
CATV
.......................,............... S1 thru S3,
M1 thru M10
U1 thru U10
PAL-D/K, SECAM-D/K
VHF
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
R1 thru R12
UHF
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21 thru 69
PAL-l
VHF
. . . . . . . . . . . . . . . . . . . . .
(IRELAND): B thru J
UHF .................. (U.K., H.K.): 21 thru 69
NTSC-M
VHF . . . . . . . . . . . . . . . . . . . . . . . . . . .
(US): 2 thru 13
(JAPAN): 1 thru 12
UHF . . . . . . . . . . . . . . . . . . . . . . . . . . .
(US): 14 thru 83
(JAPAN): 13 thru 62
CATV
.................................... A-6 thru A-1,
A thru W,
AA
Receiving Frequency
VHF
. . . . . . . . . . . . . . . . . . . . . . . . .
48.25 thru 301.25 MHz
UHF . . . . . . . . . . . . . . . . . . . . . . . . . 471.25 thru 885.25 MHz
WARNING
The chassis in this receiver is partially hot. Use an isolation transformer between the line cord plug and
power receptacle, when servicing this chassis.
To prevent electric shock, do not remove cover. No user -
qualified service personnel.
serviceable parts inside. Refer servicing to
SHARP CORPORATION

CONTENTS
h
Page
Page
l ELECTRICAL SPECIFICATIONS ........................
1
l PRINTED WIRING BOARD ASSEMBLIES ........ 21
l IMPORTANT SERVICE NOTES ........................
2
l SCHEMATIC DIAGRAMS
l SERVICE ADJUSTMENT
.................................
3
AND WAVEFORMS .................................
26
@TROUBLE SHOOTING TABLE
........................ 15 @BLOCK DIAGRAM .....................................
.33
@CHASSIS LAYOUT DIAGRAM
20
. ........................ REPLACEMENT PARTS LIST ........................
37
IMPORTANT SERVICE NOTES
Maintenance and
re
service personnel on
r
air of this receiver should be done by qualified
y.
SERVICING OF HIGH VOLTAGE SYSTEM AND PICTURE TUBE
When servicing the high voltage system, remove static charge from it by
connecting a 10 kohm Resistor in series with an insulated wire (such as a test
probe) between picture tube dag and 2nd anode lead. (AC line cord should be
disconnected from AC outlet.)
1. Picture tube in this receiver employs integral implosion protection.
2.
Replace with tube of the same type number for continued safety.
3.
Do not lift picture tube by the neck.
4.
Handle the picture tube only when wearing shatterproof goggles and after discharging the
high voltage completely.
X-RAY
This receiver is designed so that any X-Ray radiation is kept to an absolute
minimum. Since certain malfunctions or servicing may produce potentially
hazardous radiation with prolonged exposure at close range, the following
precautions should be observed:
1.
When repairing the circuit, be sure not to increase the high voltage to more than 27.3kV, (at
cut-off) for the set.
2.
To keep the set in a normal operation, be sure to make it function on 25.3kV + 15kV (at beam
1 .I mA) in the case of the set.
The set has been factory
-Adjusted to the above-mentioned high voltage.
.I If there is a possibility that the high voltage fluctuates as a result of the repairs, never
forget to check for such high voltage after the work,
3.
DOnot substitute a picture tube with unauthorized types and/or brands which may cause
excess X-ray radiation.
BEFORE RETURNING THE RECEIVER
Before returning the receiver to the user, perform the following safety checks.
1. Inspect all lead dress to make certain that leads are not pinched or that hardware is not
lodged between the chassis and other metal parts in the receiver.
2. Inspect all protective devices such as non-metallic control knobs, insulating fishpapers,
cabinet backs, adjustment and compartment covers or shields, isolation resistor-capacity
networks, mechanical insulators etc.
2

SERVICE ADJUSTMENT
PIF/AFT/SIF/AGC ADJUSTMENT
TUNER IFT COILS
The tuner has been factory preset (no
adjustment is needed).
1. Set Vr voltage at 5V in VH band.
2. Connect sweep generator’s output to the test
point of tuner, by using a 7552 DC cut probe.
I
A
w
Connection Diagram of 75G DC Cut Probe.
* NOTE:
The sweep generator’s probe should be
grounded closely to the tuner test point.
3. Output level of sweep generator: 80 dB
4. Connect response lead (low impedance probe
with detector) to the collector of Q1201 (in IF
unit).
To osci I loscope
To
1 OOOpF lN60
test 4-l I ? U- ;: *
4
AA A
Connection Diagram of Low Impedance Probe
(with Detector).
5.
6.
7.
8.
PIF AGC:
Apply DC 4.5V to pin (1) of IC1201 (in IF unit).
RF AGC:
Apply DC 4.OV (about, -2OdB) to the tuner
AGC terminal.
Connect 10k ohm resistor between base of
4203 and 12V line.
Adjust the tuner IF coils to obtain the
waveform as shown figure below.
NOTE:
For the adjustment, keep the tuner covered
with its lid.
C=P-4.43MHz P = 38.9 MHz
cLx& - l.O+O.SdB
Adjust so that “Plland “C” are at the same /eve/.
P-DETECTOR COIL: T1202
This coil (in IF unit) has been factory
5. Adjust T1202 so that 38.9 MHz signal is at
preset (no adjustment is needed).
maximum (? 50 kHz).
1.
2.
3.
4.
Connect sweep generator’s output to pin (5)
of IC1201.
l Probe in use:
758 DC cut probe
l Sweep output level:
90 dB
PIFAGC:
Apply 4.5V DC to pin (1) of IC1201.
Have AFT muted.
AFT is muted if pin (2) of IF unit is grounded.
Connect response lead to TP401.
The response lead in use should be a direct
probe with a resistor of 10k ohms included.
P (38.9 MHz)
1 Oks2
To
* test point
* Adjust PIF AGC voltage so that the output
waveform is of approx. 1 Vp-p.
-
IO kQ Direct Probe.
3

PIF/AFT/SIF/AGC ADJUSTMENT (Continued)
AFT COIL ROUOGH ADJUSTMENT: T1201
1. Connect sweep generator’s output to pin (14)
of IF unit.
l Probe in use:
750 DC cut probe
l Sweep output level: 70
dB
4.
Adjust T1201 to align the marker with the
base line. ,ker
2.
3.
Connection Diagram of 75Q DC Cut Probe.
Apply 4.5V DC (PIF AGC) to TP1203 (pin (1) of
IC201).
Connect response lead to pin (1) of IF unit.
(The response lead should be a direct probe
with a 1 Ok ohm resistor included.)
l Tune off AFT Mute.
t
1VP-P
/fil!!!A
Align the IF marker with the
base line.
To osci I loscope
* To pin (15)
l Adjust the sweep generator’s sweep range
to obtain normal S-curve on the oscilloscope
screen.
l Adjust the IF AGC voltage so that the S-
curve’s amplitude be approx.‘lVp-p.
AFT COIL: T1201
Before this adjustment, the AFT coil
(rough adjustment) must have been
completed.
1. Receive “PAL COLOUR BAR” signal with colour
bar generator.
e Signal strength: Over 55dB, Below 80dB
2. Connect oscilloscope to TP401.
l Oscilloscope range: 0.5 V/DIV
l Sweep time:
20 PsedDlV
l Synchronization: Horizontal sync.
3. Connect the output of SSG (Standard Signal
Generator) to the tuner IF output terminal
across a capacitor of 1 pF.
l SSG output frequency:
38.9 MHz (CW)
38.9 MHz + 5 kHz
l SSG output level: approx.
50 dB
4. Adjustment error:
38.900 MHz + 25 kHz.
* When the preset switch is set at U or V
position, AFT is turned off.
/ .
5. Set the preset switch at V position and adjust
FINE button (Up or Down) of tuning control so
that the output waveform suffers no beating.
6. Set the preset switch at NORMAL position.
7. Adjust T1201 so that no beating is caused at
the output waveform.
Finely adjust to make zero the beating

PIF/AFT/SIF/AGC ADJUSTMENT (Continued)
PIF OVERALL WAVEFORM
1. Set VT voltage at 5V in VH band.
2. Connect sweep generator’s output to the test
3.
4.
point of tuner.
l Probe in use: 758 DC cut probe
l Sweep output level: 70dB
Connect response lead to TP401.
The response lead in use should be a direct
probe with a resistor of 1 Ok ohms included.
RF AGC:
5.
Apply approx. 4.OV DC to the tuner AGC
terminal.
PIF AGC:
Apply approx. 4.5V DC to pin (1) of IC1201 in IF
unit.
6.
7.
Connect a 120 ohm damping resistor in
parallel to R1213 (in IF unit).
NOTE:
Cut the resistor’s leads as short as possible.
Turn off AFT:
8. Adjust IF AGC voltage so that the output
waveform is of approx. lVp-p.
9. Check that the overall waveform is as shown in
Figure below.
I
Adj-S
AFT is turned off if pin (4) of IC1201 in IF unit is
grounded.
RF-AGC CUT-IN CONTROL: R218
1. Receive “PAL COLOUR BAR” signal with colour
bar generator.
l Signal strength: 53dB
,+ 1dB
(with 75Q terminated)
2. Connect DC voltmeter to the tuner AGC
terminal (TP201).
(Full scale: 1OV)
3. Turn R218 so that the voltmeter reads the
maximum output.
4 Slowly turn R218 in the opposite direction
until the voltmeter begins to decrease its
reading; then stop turning of R218.
5. Set the signal strength at 65dB f 2dB, and
check that no noise appears.
6. Receive “MONOSCOPE PATTERN” signal, and
check that no noise appears.
l Signal strength: 65dB
+, 2dB
7. Set the signal strength at 90dB to 95dB and
check that there appears no crossmodulation
beating.
l AGC control value: 53dB ? 1 dB.
(with 75fi terminated)
“NTSC” 4.5MHz TRAP: T201
1.
2.
3.
Receive “NTSC COLOUR BAR” signal with
colour bar generator.
l Signal strength:
Over 55dB, Below 80dB.
Connect osci I loscope to TP40 1.
l Voltage range: O.SV/div.
l Sweep time: 20psecYdiv.
l Synchronization: Horizontal sync.
Adjust T201 so that the oscilloscope
waveform’s 920kHz beat be minimum.
5

PIF/AFT/SIF/AGC ADJUSTMENT (Continued)
SOUND DETECTOR COIL: T1301
This coil (in IF unit) has been factory
preset (no adjustment is basically
needed).
1. Connect SSG output to pin (16) of IC1201.
l The probe in use should be a 75Q DC cut
probe.
l SSG output level: 80dB
(5.5 MHz CW)
2. IFAGC:
Apply 4.5V DC to pin (1) of IC1201.
3. Connect DC voltmeter to pin (9) of IC1201.
(Full scale: 1OV)
4. AUDIO-MUTE ON:
Have pin (4) of IF unit grounded, and read the
value then available on the voltmeter (VTVM).
It should be approx. 4.5V.
5. AUDIO-MUTE OFF:
Remove the grounding at pin (4) of IF unit.
6. Adjust T301 so that the voltmeter indicates the
same value as in step 4 above.
AUDIO MUTE CHECKING
1. Receive “PAL COLOUR BAR” signal.
2. Set the Sound control at maximum position.
3. Stop reception of “PAL COLOUR BAR” signal.
(Pull out the antenna)
4. Check that no output of 400 Hz signal is heard
from the speaker.
6

VIDEO CIRCUIT ADJUSTMENT
CRT CUT-OFF ADJUSTMENT
l R853: Red Bias control
l R859: Green Bias control
l R865: Blue Bias control
l Screen control (a part of T602)
l R857: Green Drive control
l R863: Blue Drive control
* Note:
Prior to this adjustment, warm up the unit
with the beam current of more than 700uA for
more than 30 minutes.
1. Receive “MONOSCOPE PATTERN” signal with
pattern generator.
6. Turn 5401 (service switch) at the horizontal
line position.
2. Set Red Bias control at MIN position.
Set Green Bias control at MIN position.
Set Blue Bias control at MIN position.
Set Green Drive control at CENTER position.
Set Blue Drive control at CENTER position.
3.
Turn the “N” key on the remote controller.
4.
Set the Screen control at MIN position.
5. Connect the oscilloscope to TP852 (red
cathode).
7. Adjust Sub-Brightness control R425 to obtain a
blanking pulse level of 10 + lVp-p at TP852.
n
nqvpmp
I-1H-I
8. Disconnect the oscilloscope fromTP852.
9. Slowly turn the Screen control clockwise until
the horizontal raster appears slightly, and
stop it.
11 .Turn the Screen control counterclockwise until
the horizontal raster disappears, and stop it.
IO-Here, one of the three colours (red, blue,
green) appears first as the Screen control is
turned. So, touching off the Bias control
belonging to the first colour, use and move
the other two controls so that the horizontal
raster becomes white.
WHITE BALANCE AND BACK GROUND
l R857: Green Drive control
l R863: Blue Drive control
l R436: Sub Contrast control
*Note:
Prior to this adjustment, warm up the unit
with the beam current of more than 700pA for
more than 30 minutes.
I. Receive “MONOSCOPE PATTERN” signal with
pattern generator..
2. Set the Contrast control and Brightness
control at MAX position.
3. Connect ammeter to TP601 and TP602.
(Full scale: 3 mA)
4. Adjust Sub-Contrast control so that the beam
current becomes 1.1 mA (rough adjustment).
5. Adjust Green Drive control and Blue Drive
control so that the colour temperature is at
9300°K. (High beam: 1.1 mA).
6. Adjust the Contrast control and Brightness
control so that the beam current is approx.
200pA, and check that the colour temperature
is at 9300°K. If the temperature is not at
9300”K, go back to “CRT CUT-OFF
ADJUSTMENT” and repeat the adjustment.
(X = 0.285, Y = 0.292)
SUB-CONTRAST CONTROL: R436
* Note:
Prior to this adjustment, warm up the unit
with the beam current of more than 700uA for
more than 30 minutes.
1. Receive “MONOSCOPE PATTERN” signal with
.
pattern generator..
3. Connect beam ammeter to TP601 (-) and
TP602 ( +).
(Full scale: 3 mA)
4. Adjust Sub-Contrast control so that the beam
current becomes 1.1 mA.
2. Set the Contrast and Brightness controls at
MAX position.
7

CHROMA CIRCUIT ADJUSTMENT “PAL”
PAL CHROMA ADJUSTMENT
l R806:
1 H-delay amp. control
. T801:
1 H-delay phase control
Note: PIFIAFTIAGC adjustments should have
been completed before starting this adjustment.
1. Receive the “PAL COLOUR BAR” signal with
colour bar generator.
2. Connect the following resistance matrix to pins
3 and 4 of the connector (K), to which an
osci I loscope is connected.
22 ka
(Q-4 Ahh
Resistance Matrix
3. Set service switch S401 at the Video Cut
position to cut-off the Y-signal.
4. Turn on the “N” key the remote controller.
5. Adjust the Colour control key of the remote
controller so that the output waveform of
colour difference signal becomes Z.SVp-p.
6. Adjust IH-delay amp. control (R806) and 1 H-
delay phase control (T801) so that the output
waveform shown in Fig. a is corrected to that
shown in Fig. 6.
7. Return 5401 to CENTER position.
W Y Cy G Mq R B
Figure a. Waveform before the adjustment
-
c
Figure b. Waveform after the adjustment
PAL SUB-COLOUR ADJUSTMENT: R802
1. Receive the “PAL COLOUR BAR” signal with
colour bar generator.
2. Turn on the “N” key on the remote controller.
3. Connect oscilloscope to the TP852 (red
cathode).
l Voltage Range: ZOV/div.
l Sweep time: 20psec/div.
4. Adjust R802 so that the white signal (75%) and
red signal have the same level.
E -
W
CY G W
T
Same level for the white and red outputs.
8

CHROMA CIRCUIT ADJUSTMENT “SECAM”
BELL FILTER ADJUSTMENT: T903
I. Receive “SECAM COLOUR BAR” signal with
colour bar generator.
2. Connect the oscilloscope to TP901 with the
following settings.
l Voltage Range: 0.05 Wdiv., AC
l Sweep Time: 2Ovseddiv.
l Probe:
I/I 0 (3OpF, I OMQ or more)
3. Adjust the Bell Filter (T903) so that the Red and
Blue portions of the colour bar signal should
have the same amplitude.
W Y Cy G Mg R 6
- Same amplitude y
SECAM KILLER ADJUSTMENT: T904
I. Receive “SECAM COLOUR BAR” signal with
colour bar generator.
2. Connect the oscilloscope to TP902 with the
following settings.
l Voltage Range: IV/div., DC
(Adjust vertical position properly.)
l Sweep Time: 20 psec/div.
3. Adjust T904 to obtain maximum DC voltage
(approx. 7.5V) at TP902.
B-Y (T901), R-Y (T902) DISCRIMINATOR ADJUSTMENT
Note: Connect a O.OOlvF capacitor to TP851 and
TP853 respectively to filter out interference
noise.
TP851
rl
I.
2.
3.
4.
5.
Receive “SECAM COLOUR BAR” signal with
colour generator.
Connect the oscilloscope (with two channels)
to TP851 (R-Y) and the TP853 (B-Y), both
located on the CRT Socket Unit (PWB-B) of the
set.
l Voltage Range: ZV/div., DC
l Sweep Time:
IO pseddiv.
Set service switch 5401 at the Video Cut
position to cut-off the Y-signal.
Set both the Contrast and Brightness controls
to their maximum positions.
Adjust T901 and T902 so that the DC output
levels obtained when the colour control is set
to minimum (black and white level) and those
when set to 100% colour saturation become
the same.
6. Return 5401 to CENTER position.
DC OV
9

CHROMA CIRCUIT ADJUSTMENT “NTSC”
SUB-HUE: R835
I. Receive “NTSC COLOUR BAR” signal with
colour generator..
2. Connect the oscilloscope to TP853 (B-Y).
3. Turn on the “N” key on the remote controller.
4. Set service switch 5401 at the Video Cut
.*-
.-
-
Same level y
.*
d**-=
.-
position to cut-off the Y-signal.
5. Operating the Colour control key on the
remote controller, adjust the B-Y waveform to
approx. 3Vp-p.
.--
-
.-
.*-
B-Y
.-
-
W Y Cy G Mg R B
-
6. Adjust Sub-Hue control R835 so that the
waveform is obtained.
7. Return 5401 to CENTER (normal) position.
-
IO

ADJUSTMENT OF DEFLECTION LOOP
Note; During the adjustment, keep the unit facing the east.
FOCUS ADJUSTMENT
1. Receive “MONO SCOPE PATTERN” signal.
2. Set Contrast and Brightness controls at
CENTER position.
3. Adjust Focus control to have best focus at the
central area of CRT.
Adjust point
HORIZONTAL CENTERING CONTROL: R602
This adjustment should be performed
after the purity and convergence
adjustments.
1. Receive “MONO SCOPE PATTERN” signal.
2. Adjust R602 so that the horizontal center of
picture is at the position which gives the
relation of A = B .
VERTICAL LINEARITY CONTROL: R526
1. Receive “MONO SCOPE PATTERN” signal.
2. Adjust R526 so that the vertical linearity of
picture is at best point.
VERTICAL SIZE CONTROL: R503
1. Receive “MONO SCOPE PATTERN” signal.
3. Adjust R503 so that the vertical size of picture
2. Set the Brightness and Contrast controls at
is at best point.
maximum position.
l Vertical size: 8% TYP (Max. 10%)
VERTICAL CENTERING CONTROL: S501
This adjustment should be performed
after the purity and convergence
adjustments.
1. Receive “MONO SCOPE PATTERN” signal.
2. Adjust 5501 so that the vertical center of
picture is at the geometrical center of screen.
11

PURITY ADJUSTMENT
Note: During the adjustment, keep the unit facing the east.
PURITY ADJUSTMENT
I
9
a
I
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. . . . . . . . .
. . . . . . . . . . . . . . .I
. . . . . . . ., ., ., .,.
. . ............ .
>:.>: ........................ 1
.:.:.:.:.:.:.:.:.~:.:.::::::::
. . . . . . . . . . . . . . . ..+‘.....
‘.‘,‘.‘.:.:.:.:.:,:.:.:.:.:.:.:
. ..i . . . . . . . . . ,
.i... . . . . . . . . . . . .
. ...: ,.... .................
. . . . . . . . . . . . . . . . .
. . . . . .
::::.:.:.:.:.:.:.:.:.:.:.:.:.
,
..:.:.:.:.:.:.:.:.:.:.:.:.: ,
.......................
. ..:.:j::;:.:.:.v
Right
The beam landing is shifted to right.
Left
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, iiiiiiii:i:i:i:i:~:i:i:i::
, ::::.;.:..:.:.:.:,:.;.~.~.;..
, ..,... I:.:.:.:.;.:.:.:.:..
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I
:::::::::::::::::::::::: j::::::
I::::::;:::::::::::::::::::::::
...............................
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.
. . ., ., ., ., ., ., ,..
I
. . . . . . . . .
. . . . . .
I
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. . . . . . . . . . . . . .
II
_., . . . .,.
. . . ..‘...........
. . . . . . . . . . .
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,...... ~.~_~.~i.....~.~.~.. .,
.~...~_~.~.~.~.~_~.~.~.~.~.~.~.
I
...... ..~...~_....._
. . . . . . .
. ..‘.‘. . .
. . . . . .
. . . . . . .
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..... ..~.~.~.~.......~.~.~.~...
; ~ii~i~iX~~~Ei
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\ ::::.:_:.:_:_:.:.:.: :_:_.’
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Figure 6.
The beam landing is shifted to left.
Right
1. Prior to the purity adjustment, warm up the
unit with beam current of more than 700 PA,
for rnore than 30 minutes.
2. Receive the green signal alone and adjust the
beam current to approx. 770 PA.
3. Fully degauss the CRT with the degaussing
coil.
4. Before the purity adjustment, it is needed to
roughly adjust the static convergence.
5. Set the purity magnet at the position which
gives zero (0) magnetic field.
Adjustment
6. Observe the green spots (“a” and “b”) with a
microscope as shown Fig. A, and adjust the
purity magnet so that they are at the
specified landing position.
7. If the right and left green spots are both
deviated outwards from their landing
positions as shown in Fig. B,’ push the
deflection yoke forwards until their positions
are corrected.
8. If the beam landing is shifted to *right or left
as shown in Figs. Cand D, adjust the opening
degree of the purity magnet so that the beam
landing is correctly positioned.
9. Adjust the purity magnet so that the beam
landing is correct at either of the central part,
right and left parts of screen, then check that
the green beams at four corners of screen are
all correctly positioned.
Finally, check that the beam landing at any
pat of screen is satisfactory with the Rank “B”
specifications.
IO. If the green beam is positioned to mix with
the other colour, pull the deflection yoke
backward.
l Outside of the specified landing:
To front of the deflection yoke.
l inside of the specified landing:
To back of the deflection yoke.
Il. Set the raster rotation at “0” position (with
the unit facing the east).
12. Tighten the screws of the deflection coil.
Tightening torque: 11 kg + 2 kg.
Figure D.
12

CONVERGENCE ADJUSTMENT
Note: During the adjustment, keep the unit facing the east.
CONVERGENCE ADJUSTMENT
Wedge “a”
/Wedge “c“
4-pole magnet
f
6-pole magnet
- Lacqer
Purity magnet
Figurea.
RGB
l
. . . . . . . . . . . . . ...*.....
f -
. . . . . . .
I .
---------m-~ -WM.
I ;
r i
i ;
’ :
Figurec.
RGB
I
\ :
f
\ :
\ :
\ :
--*a.....
. -cd-
*- R
*..._ L-L
-4-l
cc -
me.....
G
:1
a-...
B
: 1
: \
: \
\
Figureb.
BGR
--.B--------~-
: -f- R
, G
. . . . . . . . . . . . . . . . ..-....-.
.,..
i-1 B
: I
: f
: I
* I
.
: I
.
Figured.
This adjustment should be performed
after the purity magnet adjustment.
1. Receive “CROSSHATCH PATTERN” signal.
2. Set. the Brightness control and Contrast control
at MAX position.
STATIC CONVERGENCE
3. Adjust the opening degree of the 4-pole
magnet and rotate the magnet to converge
red and blue lines.
4. Adjust the opening degree of the 6-pole
magnet and rotate the magnet to converge
red, blue and green lines.
DYNAMIC CONVERGENCE
5. Dynamic convergence (convergence of the
three colour fields) at the edges of CRT screen
is accomplished in the following manner.
Convergence in Fig. a:
insert wedge”a” between the deflection yoke
and CRT, and tilt the deflection yoke upward
until the mis-convergence shown in Fig. a is
corrected.
Convergence in Fig. b:
Insert wedges “b” and “c” between the
deflection yoke and CRT, and tilt the
defllection yoke until the mis-convergence
shown in Fig. b is corrected.
Convergence in Fig. c:
Insert wedge “c”
deeply between the
deflection yoke and CRT, and tilt the
deflection yoke to right until the mis-
convergence shown in Fig. c is corrected.
Convergence in Fig. d:
Insert wedge “b” deeply between the
deflection yoke and CRT, and tilt the
deflection yoke to left until the mis-
convergence shown in Fig. d is corrected.
6. Stick the three wedges onto the CRT, and
apply glass tapes thereon.
7. Apply lacquer to the deflection yoke screw,
magnet unit (made of purity, 4-pole and 6-
pole magnets) and magnet unit screw.
After the adjustment, receive either the Red or
the Blue signal and check that there is no mixture
with the other colour signal.
13

CRT DISPLAY ADJUSTMENT
Note; During the adjustment, keep the unit facing the east.
SIGN POSITION CONTROL: RI 017
1. Set the channel number at 2.
2. Display the channel sign by means of the
channel call of remote control on the screen.
3. Adjust the sign position by R1017 so that it is
set 50 mm away from the CRT edge.
CRT edge
1
14

TROUBLE SHOOTING TABLE
NO RASTER
Check F701.
r
1
Blown out.
Check T701 pin (1) voltage
(Approx. 290V DC at 220V
AC).
r
1
I Check R701 and R702. 1
Check + B voltage
(Approx. 1 PW).
I
Approx. OV.
Check D702.
Normal
Check CRT connector
Kl -K5 bias.
15

CIRCUITS TO BE CHECKED:
l Tuner.
NO PICTURE, NO SOUND
. PIF.
l Automatic Gain Control.
0 12V + B2 Power Source.
Does the noise level increqse at max.
Contrast, Brightness and Sound controls?
I
I
Noise increases but no signal is
received.
I
Check the tuner BL, BH, Bu and
+ B2 biases.
+ 62 must be approx. IZV.
BL must be approx. l2Vand
BH must be approx. 12V with the
preset switch at VHF position.
Bu must be approx. 12V with the
band switch at UHF position.
I
Picture noise decreases but sound
level varies greatly.
I
Does the I2V +B appear at pin
(11) of connector- ?
Check the tuner AGC.
I
Normal Abnormal
16

CIRCUITS TO BE CHECKED:
l IC801 and its adjacent
circuit.
l R.G.B. output circuit.
Specific colours are not produced
in colour broadcast reception.
Is some colour produced in B/W broadcast Yes
Is the white balance properly
Readjust the white balance. I
I
The picture colour is red or
cyan.
I I
The picture colour is green or
1 ’
The picture colour is blue or
magenta.
yellow.
17

CIRCUITS TO BE CHECKED:
l IC801 and its adjacent
circuit.
l R.G.B. output circuit.
,
/
Is some colour produced in B/W broadcast
Yes
I
When change channel does
colour appeared?
Colour appears but colour
shading.
/
Yes
No
Colour appears but
* abnormal colour.
Check pins (22), (23)
and (27) of K801 bias.
I I
I
Check pins (18), (20) and (21) of
IC802 bias.
I
1 Check IC801. I
Normal
Check Q853 and its
18

CIRCUITS TO BE CHECKED:
l IC801 and its adjacent
circuit.
0 R.G.B. output circuit.
/
NO SPECIFIC COLOUR (NTSC)
Specific colours are not produced
in colour VCR NTSC4.43 reception.
19

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