NEC PF-68T31 User manual

PF-68T31
PF-68V21
CONTENTS
zSPECIFICATIONS …………………………………………………………………….. 2
zSAFETY PRECAUTIONS …………………………………………………………….. 3
zSERVICE ADJUSTMENTS …………………………………………………………… 7
zPARTS LIST …………………………………………………………………………… 19
zSTANDARD CIRCUIT DIAGRAM
S
S
SE
E
ER
R
R
V
V
V
I
I
IC
C
CE
E
EM
M
M
A
A
A
N
N
NU
U
U
A
A
A
L
L
L
COLOUR TELEVISION
RE-001
TV/AV
P+
V- MENU V+
CALL P-
SLEEP LOCK
QV
1 2 3
SCAN
4 5 6
ZOOM
7 8 9
0 -/ --
Æ |
|Å
♪Æ | ♪|
Å

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2
SPECIFICATIONS
Item Specifications
Dimensions(W x H x D)
Weight
730 mm x 590 mm x 520 mm
49.5 kg
TV RF System B/G
TV Mode PAL Colour System
Video Mode PAL/ NTSC 3.58/ NTSC 4.43
VHF (VL) 46.25 MHz to 168.25 MHz
VHF (VH) 175.25 MHz to 463.25 MHz
UHF 471.25 MHz to 863.25 MHz
Receiving
Frequency
CATV None
VIF Carrier 38.9 MHz Intermediate
Frequency SIF Carrier 33.4 MHz
Colour Sub Carrier Frequency PAL (4.43 MHz)
Aerial Input Terminal 75 Ohm Unbalanced DIN
Power Input Rated Voltage 240 V AC, 50/60 Hz
Power Consumption 145 W (Max.)
Picture Tube Visible Size: 68 cm measured diagonally
High Voltage 30 kV ±1.5 kV (at Zero beam current)
Speaker 8 cm x 13 cm Oval x 2
Audio Output 8 W + 8 W
Video 1 Vpp, 75 Ohm, RCA x 2
S-Video Input Y, C
Components Input Y, Cb, Cr (PF-68T31)
Input
Audio 500 mVrms (-4dBs), High impedance, RCA x 4
Video 1 Vpp, 75 Ohm, RCA x1
Audio 500mVrms (-4dBs), Low impedance, RCA x 2
Output
Headphone jack Stereo Mini jack (φ3.5mm)
Remote Control Unit RE-002 (PF-68V21), RE-003 (PF-68T31)
(Battery size: AAA/R03/UM-4 x 2)
Design & specifications are subject to change without notice.

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3
SAFETY PRECAUTIONS
1. The design of this product contains special hardware, many
circuits and components specially for safety purposes. For
continued protection, no changes should be made to the
original design unless authorized in writing by the
manufacturer. Replacement parts must be identical to those
used in the original circuits. Service should be performed by
qualified personnel only.
2. Alterations of the design or circuitry of the products should
not be made. Any design alterations or additions will void
the manufacturer’s warranty and will further relieve the
manufacturer of responsibility for personal injury or property
damage resulting therefrom.
3. Many electrical and mechanical parts in the products have
special safety-related characteristics. These characteristics
are often not evident from visual inspection nor can the
protection afforded by them necessarily be obtained by
using replacement components rated for higher voltage,
wattage, etc. Replacement parts which have these special
safety characteristics are identified in the parts list of
Service manual. Electrical components having such
features are identified by shading on the schematics
and by (
 ) on the parts list in Service manual. The use
of a substitute replacement which does not have the same
safety characteristics as the recommended replacement
part shown in the parts list of Service manual may cause
shock, fire, or other hazards
4. Don’t short between the LIVE side ground and
ISOLATED (NEUTRAL) side ground or EARTH side
ground when repairing. Some model’s power circuit is
partly different in the GND. The difference of the GND is
shown by the LIVE: ( ) side GND, ISOLATED (NEUTRAL) :
( ) side GND and EARTH : ( ) side GND. Don’t short
between the LIVE side GND and ISOLATED (NEUTRAL)
side GND or EARTH side GND and never measure with a
measuring apparatus (oscilloscope etc.) the LIVE side GND
and ISOLATED (NEUTRAL) side GND or EARTH side GND
at the same time. If above note will not be kept, a fuse or
any parts will be broken.
5. If any repair has been made to the chassis, it is
recommended that the B1 setting should be checked or
adjusted (See ADJUSTMENT OF B1 POWER SUPPLY).
6. The high voltage applied to the picture tube must conform
with that specified in Service manual. Excessive high
voltage can cause an increase in X-Ray emission, arcing
and possible component damage, therefore operation under
excessive high voltage conditions should be kept to a
minimum, or should be prevented. If severe arcing occurs,
remove the AC power immediately and determine the cause
by visual inspection (incorrect installation, cracked or melted
high voltage harness, poor soldering, etc.). To maintain the
proper minimum level of soft X-Ray emission, components
in the high voltage circuitry including the picture tube must
be the exact replacements or alternatives approved by the
manufacturer of the complete product.
7. Do not check high voltage by drawing an arc. Use a high
voltage meter or a high voltage probe with a VTVM.
Discharge the picture tube before attempting meter
connection, by connecting a clip lead to the ground frame
and connecting the other end of the lead through a 10kΩ
2W resitor to the anode button.
8. When service is required, observe the original lead dress.
Extra precaution should be given to assure correct lead
dress in the high voltage circuit area. Where a short circuit
has occurred, those components that indicate evidence of
overheating should be replaced. Always use the
manufacturer’s replacement components.
9. Isolation Check
(Safety for Electrical Shock Hazard)
After re-assembling the product, always perform an isolation
check on the exposed metal parts of the cabinet (antenna
terminals, video/audio input and output terminals, Control
knobs, metal cabinet, screwheads, earphone jack, control
shafts, etc.) to be sure the product is safe to operate without
danger of electrical shock.
(1) Dielectric Strength Test
The isolation between the AC primary circuit and all metal
parts exposed to the user, particularly any exposed metal
part having a return path to the chassis should withstand a
voltage of 3000V AC (r.m.s.) for a period of one second.
(…Withstand a voltage of 1100V AC (r.m.s.) to an appliance
rated up to 120V, and 3000V AC (r.m.s.) to an appliance
rated 200V or more, for a periode of one second.)
This method of test requires a test equipment not generally
found in the service trade.
(2) Leakage Current Check
Plug the AC line cord directly into the AC outlet (do not use
a line isolation transformer during this check.). Using a
“Leakage Current Tester”, measure the leakage current
from each exposed metal part of the cabinet, particularly
any exposed metal part having a return path to the chassis,
to a known good earth ground (water pipe, etc.). Any
leakage current must not exceed 0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.2mA AC
(r.m.s.).
●Alternate Check Method
Plug the AC line cord directly into the AC outlet ( do not use
a line isolation transformer during this check.). Use an AC
voltmeter having 1000 ohms per volt or more sensitivity in
the following manner. Connect a 1500 Ω10W resistor
paralleled by a 0.15 μF AC-type capacitor between an
exposed metal part and a known good earth ground (water
pipe, etc.). Measure the AC voltage across the resistor with
the AC voltmeter. Move the resistor connection to each
exposed metal part, particularly any exposed metal part
having a return path to the chassis, and measure the AC
voltage across the resistor. Now, reverse the plug in the AC
outlet and repeat each measurement. Any voltage
measured must not exceed 0.75V AC (r.m.s.). This
corresponds to 0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.3V AC
(r.m.s.).
This corresponds to 0.2mA AC (r.m.s.)

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4
EXPLODED VIEW PF-68T31/PF-68V21
FRONT CABINET
SPEAKER &
SPEAKER BOX
REAR TERMINAL
BOARD
CRT PWB
CONTROL PWB
IR/LED PWB
TELETEXT PWB
(PF
-
68T31)
STEREO PWB PF-68T31
MAIN PWB
POWER PWB
REAR CABINET
AC POWER CORD

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5
REPLACEMENT OF MEMORY IC
1. MEMORY IC.
This TV uses memory IC. In the memory IC are memorized data for correctly operating the video
and deflection circuits.
When replacing memory IC, be sure to use IC written with the initial value of data.
2. PROCEDURE FOR REPLACING MEMORY IC
(1) Power off
Switch the power off and unplug the power cord from AC outlet.
(2) Replace IC
Be sure to use memory IC written with the initial data values.
(3) Power On
Plug the power cord into the AC outlet and switch the power On.
(4) Check and set SYSTEM default value:
1) Press “TEST” key on the special service use Remote control unit.
2) The “TEST” will be displayed on the screen.
3) Press “0” to “8“ key, (Mkey) and corresponding on-screen display will be appeared.
4) In this section, except “3”, “4” and “5” key function would be confirmed.
5) Check the setting value of the SYSTEM default value of Table 1. If the value is different,
select items by [CH+]/[CH-] keys and set value by [VOL+]/[VOL-] keys.
6) Press “TEST” key again and return to the normal screen.
SERVICE ADJUSTMENT
B1 POWER SUPPLY
1. Receive normal colour bar signal.
2. Connect DC voltmeter to TP91 and isolated ground.
3. Adjust VR651 to get the voltage as 130V ±1.0V.
FOCUS ADJUSTMENT
1. Receive a crosshatch signal.
2. While watching the screen, adjust the FOCUS VR to make the vertical and horizontal lines as
fine and sharp as possible.
STEREO ADJUSTMENT (PF-68T31)
1. Receive A2 stereo signal.
2. Adjust L3101 to get the voltage at TP1 (N3101 Pin #3) as 2.5V ±0.1V
3. Adjust VR3101 to get same amplitude at TP3 and TP4.
BUS CONTROL ADJUSTMENT
To enter BUS control mode, use special remote control with “TEST” key, and push “TEST” key.
On TV screen “TEST” will be indicated, this means entered bus control mode.

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6
And press following key, each function will be available.
Remote Hand Unit keys
[M1] [M2] [M3] [M4]
1 2 3 4
[M5] [M6] [M7]
5 6 7 8
[M0]
9 0
[M4] menu
MENU4 Geometrical adjustment
Receive PAL standard Complete pattern signal.
Adjustment steps：
a) Adjust V. SLOPE, to the center horizontal line just appeare from half bottom shadow.
b) Adjust V-SHIFT, the center horizontal line correspond to CRT vertical center.
c) Adjust V-AMPL, to get 90% of vertical picture contents would be displayed on CRT.
[M5] menu
a) Adjust H-SHIFT, to get the picture horizontal center correspond to CRT horizontal center.
b) Adjust H-AMP, to get 90% of horizontal picture contentswould be displayed on CRT.
c) Adjust H-PARABORA, to get minimum side pincushion distortion.
d) Adjust CORNER, to get minimum distortion of 4-corners.
e) Adjust TRAPEZ, to get minimum trapezoid distortion.
Receive NTSC signal and repeat above [M4] and [M5] adjustment.
[M2] Menu
RF AGC Adjustment.
Receive 60dBμ(1mV)VHcolour bar pattern signal，adjust AGC value（voltage from high to low），to
noise reduce gradually and just disappeared point.
[M3] Menu
CRTcut off and white balance adjustment.
Receive white signal.
a) CRT cut off adjustment.
1. Select “SC”, then automatically vertical scan will be stopped.
2. Adjust SCREEN control on Flyback transformer to get the darkest single horizontal line
(red, green, or blue, sometimes shows more yellow, more purple or more white).
3. Using (above) 1、2，5、6, 9, 0 keys, to get one white horizontal bar. Then re-adjust
SCREEN control to get horizontal bar would be just visible.
b) White balance adjustment.
1. Select WR/WB menu.
2. Adjust WR/WB to get colour temperature as x=281, y=311

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7
c) Sub-Brightness adjustment. (Use stair case signal)
1. Select SB menu.
2. Adjust SB to get the darkest step being cutoff.
Default Settings
Mkey ITEMS VARIABLE RANGE DEFAULT
M0
PAL
NTSC 3.58
NTSC 4.43
SECAM
D/K
I
B/G
M
0 →1
0 →1
0 →1
0 →1
0 →1
0 →1
0 →1
0 →1
1
1
1
0
0
0
1
0
M1
Headphone
CPU Vol
Band Mode
Search Speed
Power ON
BUS Stop(Open)
Shipping
0 →1
0 →1
0 →1
0 →1
0 →1
0 →1
1
0
1
0
0
0
0
M2
RF AGC Delay
Y-Delay
Sound Volume
Sub-Sharpness
Sub-Colour
IF Freq.
AV Mode
0 →63
0 →15
0 →63
0 →63
0 →63
0 →5
6
7
46 (PF-68V21)
47 (PF-68T31
50
50
38.9
4 (PF-68V21)
5 (PF-68T31)
M3 C
BR
CT
SC
WR
WG
WB
SB
0 →7
0 →100
0 →100
0 →63
0 →63
0 →63
0 →63
6
20
75
45
45
45
50
PAL NTSC
32
29
30
32
28
31
M4
V.SLOPE
V.SHIFT
V.AMPL
S.CORR
0 →63
0 →63
0 →63
0 →63 21

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8
PAL NTSCM5
H-SHIFT
H-AMPL
H-PARABORA
CORNER
TRAPEZ
0 →63
0 →63
0 →63
0 →63
0 →63
39
53
23
30
32
43
53
31
30
30
M6 OSD-H
OSD-V
0 →29
0 →29
2
1
M7 V. AMPL1
V. AMPL2
0 →38
0 →38
9
0
ICs functional description
3.1 N701 KS88P8432N-XXX function:Microcomputer
NAME PI
N
FUNCTION NAME PIN FUNCTION
VT 1 Tuning Voltage Output TTX RST 42
RELAY 2 Relay control output STAND BY 41 Stand-by output
Y Cb Cr 3 Component input
control
SDA 40 IIC data
AV1 4 Input select output SCL 39 IIC clock
AV2 5 Input select output SERVICE 38
6 Not used VSS 37 GND
7 Not used IR IN 36 Remote signal input
8 Not used 35 Not used
KEY IN 9 Local key input VDD 34 Vdd 5V
10 Not used RESET 33 Reset input
LV PROTECT 11 Low Voltage protect X’TAL OUT 32 X’tal output
MUTE 12 Mute output X’TAL IN 31 X’tal input
VSS 13 GND VSS 30 GND
14 Not used OSD OUT 29
15 Not used OSD IN 28
LED1 16 Stand by LED output V SYNC 27 V. Sync input
BAND1 17 Band select output H SYNC 26 H. Sync input
BAND2 18 Band select output FAST BLANK 25 OSD Fast blank output
LED2 19 On-Timer LED output R OUT 24 OSD Red output
20 Not used G OUT 23 OSD Green output
21 Not used B OUT 22 OSD Blue output
NOTE:··Pin No. 9: Control key input (Analog to Digital Convertor)
(Max. Limit voltage)
FUNCTION MENU TV/AV POWER V+ V- P+ P-
VOLTAGE 0 0.625 1.25 1.875 2.5 3.125 3.75

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9
N301 TDA8843 Function: I2C bus controled PAL/NTSC one chip processor
Symbol PIN Function Symbol PIN Function
SIF IN 1 B-Y OUT 29
EXT AUDIO IN 2 R-Y OUT 30
3 B-Y IN 31
4 R-Y IN 32
PLL LOOP FILT 5 CHROMA 33
VIDEO OUT 6 X’tal 3.58 34
SCL 7 X’tal 4.43 35
SDA 8 COLOR PLL 36
BANDGAP 9 +B SUPPLY 37
S Video C IN 10 CVBS SW OUT 38
S Video Y IN 11 DIGIDEC 39
VDD 12 H OUT 40
INT CVBS IN 13 FBT PULSE 41
GND 14 PH-2 42
AUDIO OUT 15 PH-1 43
16 GND 44
EXT CVBS IN 17 E/W OUT 45
BLACK
CURRENT
18 Y OUT- 46
B-OUT 19 Y OUT+ 47
G-OUT 20 IF IN 48
R-OUT 21 IF IN 49
BEAM 22 EHT 50
R-IN 23 VSAW 51
G-IN 24 V-REF 52
B-IN 25
IF AGC 53
F BLANK 26 TUNER AGC 54
Y-IN 27 DE EMPH 55
Y OUT 28 SOUND 56
N802 TDA2009A Function : audio output
Symbol PIN Function
description
Symbol PIN Function
description
NON INV IN(1) 1 LEFT IN(NON INV) N.C.+ 7 N.C.
INV IN(1) 2 LEFT IN(INV) OUT(2) 8 RIGHT OUT
SVRR 3 SVRR +Vs- 9 POWER SUPPLY-
INV IN(2) 4 RIGHT IN(INV) OUT(1) 10 LEFT OUT
NON INV IN(2) 5 RIGHT IN(NON INV) N.C. 11 N.C.
GND 6 GND

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10
N801 TDA8354Q Function : vertical output
Symbol PIN Function description Symbol PIN Function description
Vo(guard) 1 Guard output voltage GNDA 8 Ground A
Vi(M) 2 Input measuring resistor Vo(A) 9 Output voltage A
Vi(con) 3 Input conversion resistor Vp(A) 10 Supply voltage A
Vp(B) 4 Supply voltage B Ii(neg) 11 Input power stage(negative);
includes Ii(sb) signal bias
Vo(B) 5 Output voltage B Ii(pos) 12
Input power stage (positive;
includes Ii(sb) signal bias
GNDB 6 Ground B Ii(comp) 13 Input for damping resistor
compensation current
Vflb 7 Flyback supply voltage
N503 TDA9860 Universal Sound processor
Symbol Pin Function Symbol Pi
n
Function
AV1L 1 AV1 Audio Left input AV1R 32 AV1 Audio input Right
P1 2 Not used P2 31 Not used
MAINL 3 Main Audio Left
input
AV2R 30 AV2 Audio input Right
CSMO 4 Smoothing Capacitor CPS1 29 Pseudo stereo Cap. 1
MAINR 5 Main Audio Right
input
AV2L 28 AV2 Audio input Left
VP 6 Power Supply CPS2 27 Pseudo stereo Cap. 2
OUT R 7 Right Output OUT L 26 Left Output
GND 8 Ground MAD 25 Not used (GND)
LINOR 9 Line Output Right LINOL 24 Line Output Left
LINIR 10 Line Input Right LINIL 23 Line Input Left
CBR1 11 Bass Cap. Right 1 CBL1 22 Bass Cap. Left 1
CBR2 12 Bass Cap. Right 2 CBL2 21 Bass Cap. Left 2
Headphone R 13 Headphone-R output Headphone L 20 Headphone-L output
CTR 14 Treble Cap. Right CTL 19 Treble Cap. Left
MAINOR 15 Main Audio out Right MAINOL 18 Main Audio out Left
SCL 16 I2C Bus clock SDA 17 I2C Bus data

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11
. Wave forms
All IC/Transistors voltages
N301 TDA8843
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14
V 0.2 3.6 0 0 2.5 3.0 4.5 4.6 6.7 1.1 3.4 7.8 3.9 0
PIN 15 16 17 18 19 20 21 22 23 24 25 26 27 28
V 3.0 0 3.4 5.6 2.5 2.5 2.4 2.0 2.6 2.6 2.6 0.1 2.8 2.8
PIN 29 30 31 32 33 34 35 36 37 38 39 40 41 42
V 2.3 2.3 2.3 2.3 0.3 2.5 2.5 5.0 7.1 2.5 5.0 0.4 0.7 3.4
PIN 43 44 45 46 47 48 49 50 51 52 53 54 55 56
V 4.0 0 4.0 1.3 2.8 4.6 4.6 1.9 3.8 3.9 4.5 2.6 2.9 3.4
N202 LA7910
PIN 1 2 3 4 5 6 7 8 9
VHF-L 8.5 0 0 0 0 10.3 0 0 8.5
VHF-H 0 8.5 1.6 0 0 10.3 0 0 8.5
UHF 0 0 0 1.6 0 10.2 8.5 6.4 8.5
N301 PIN41N301 PIN40
N301 PIN21
N301 PIN20N301 PIN19
N301 PIN38N301 PIN13
N301 PIN17
N701 PIN27N701 PIN26
V902 C N301 PIN15N301 PIN47
5Vpp
0.6Vpp
2.5Vpp
2.5Vpp2.5Vpp
2.2Vpp1.2Vpp
1Vpp
4.6Vpp4.2Vpp
1000Vpp 1.3Vpp1Vpp
V
H
H
H
H
H
H
H
H
V
H
H
T611 PIN10HEATER
N1701 PIN9
N1701 PIN8N1701 PIN7
300Vpp22Vpp
95Vpp
95Vpp95Vpp
H
H
H
H
H
H
V902 B
2.7Vpp

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12
N802 TDA2009A
PIN 1 2 3 4 5 6 7 8 9 10 11
V 1.3 0.7 12.6 0 1.3 0 0 11.4 20.1 11.4 0
N503 TDA9860
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14
V 4.0 0 4.0 8.0 4.0 8.0 4.0 0 4.0 4.0 4.0 4.0 4.0 4.0
PIN 15 16 17 18 19 20 21 22 23 24 25 26 27 28
V 4.0 4.5 4.6 4.0 4.0 4.0 4.0 4.0 4.0 4.0 0 4.0 4.0 4.0
PIN 29 30 31 32
V 4.0 4.0 0 4.0
Transistors voltages
V201 V301 V302
B C E B C E B C E
1.0 8.5 0.2 2.2 0 2.9 2.9 7.2 2.2
V303 V304 V480
B C E B C E B C E
1.8 5.8 1.3 3.8 7.8 3.2 2.5 8.1 1.8
V560 V561 V611
B C E B C E B C E
1.3 2.0 2.0 1.3 2.0 2.0 5.4 3.6 5.8
V612 V615
B C E B C E
3.6 2.1 0 1.7 2.1 0
V651 V681 V702
B C E B C E B C E
7.0 36.8 6.4 0 0 0 0 5 0.1
V703 V704 V705
B C E B C E B C E
0 5.0 2.5 0 5.0 2.5 4.4 5.1 5.1
V706 V707 V801
B C E B C E B C E
0 5.1 0 5.1 0 5.1 0 0 0
V802 V804 V806
B C E B C E B C E
0 0 0 8.16 0.1 8.22 5.6 20.1 5.0

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13
V901 V902 V905
B C E B C E S D G
0.5 44.1 0 -0.1 128.6 0 0 16.0 4.0
V906 V908
B C E B C E
5.5 0 5.6 0.7 1.4 0
*********************** Special Function ************************************
Special Setup for limited purpose.
This TV has special setup for TV locking function. From normal operation select “CHILD
LOCK” and…
Receiving [LOCK] key command, CHILD-LOCK menu
will be appeared.
On this situation, received [LOCK] key again, over
3 seconds,
i) All front panel keys will be disabled.
ii) Only by remote control, TV can be operated.
By receiving over 3 seconds [LOCK] key command, lock situation will be changed as ON or
OFF.
If {PANEL LOCK} system, describe later, set to ON, even with above command can not turn
to OFF.
In this mode, if receiving numeric command “9999”, CHILD LOCK mode will be changed to
“LOCK FUNCTION” mode. “9999” will not be displayed on screen.
In this mode, cursor can be moved up/down
by [CH+]/[CH-] keys.
Setting status can be changed by
[VOL+]/[VOL-] keys.
After setting to “ON”, the program can not be
accessed by [CH+]/[CH-] keys.
By [LOCK] key command, mode can be exit.
CH PRESET LOCK
If this item were set to “ON”;
i) Automatic Search and Memory function were disabled.
ii) Manual Search function were disabled.
iii) Fine Tuning function were disabled.
CHILD LOCK
ON
LOCK FUNCTION
CH PRESET LOCK OFF
VOLUME LIMIT 33
AV LOCK OFF
PANNEL LOCK ON

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14
VOLUME LIMIT
Maximum Volume control value by customer would be limited with this figure.
AV LOCK
If this item were set to “ON”, after exit from this LOCK mode;
i) Only with AV input are available to use.
ii) RF (Tuner) input function will be disabled.
PANNEL LOCK
If this item were set to “ON”;
iii) All front panel keys will be disabled.
iv) Only by remote control, TV can be operated.
**************************** End Special **********************************

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15
PURITY / CONVERGENCE ADJUSTMENT
PURITY ADJUSTMENT
1. Demagnetize CRT with the demagnetizer.
2. Loosen the retainer screw of the deflection yoke.
3. Remove the wedges.
4. Input a green raster signal from the signal
generator, and turn the screen to green raster.
5. Move the deflection yoke backward.
6. Bring the long lug of the purity magnets on the short
lug and position them horizontally. (Fig2)
7. Adjust the gap between two lugs so that the GREEN
RASTER will come into the center of the screen.
(Fig. 3)
8. Move the deflection yoke forward, and fix the
position of the deflection yoke so that the whole
screen will become green.
9. Insert the wedge to the top side of the deflection
yoke so that it will not move.
10. Imput a crosshatch signal.
11. Verify that the screen is horizontal.
12. Input red and blue raster signals, and make sure
that purity is properly adjusted.
CRT
WEDGE
DEFLECTION YOKE
P
4 6
P: PURITY MAGNET
4: 4-POLES (convergence magnets)
6: 6-POLES (convergence magnets)
P/C MAGNETS
Fig. 1
PURITY MAGNETS
Long lug
Short lug
Bring the long lug over the short lug
and position them horizontally.
Fig. 2
(FRONT VIEW)
GREEN RASTER
CENTER
Fig. 3

.
16
STATIC CONVERGENCE ADJUSTMENT
1. Input a crosshatch signal.
2. Using 4-pole convergence magnets, overlap the red
and blue lines in the center of the screen (Fig. 1) and
turn them to magenta (red/blue).
3. Using 6-pole convergence magnets, overlap the
magenta (red/blue) and green lines in the center of
the screen and turn them to white.
4. Repeat 2 and 3 above, and make the best
convergence.
DYNAMIC CONVERGENCE ADJUSTMENT
1. Move the deflection yoke up and down and overlap
lines in the periphery. (Fig. 2)
2. Move the deflection yoke left to right and overlap the
lines in the periphery. (Fig. 3)
3. Repeat 1 and 2 above, and make the best
convergence.
After adjustment, fix the wedge at the original position.
Fasten the retainer screw of the deflection yoke.
Fix the 6 magnets with glue.
(FRONT VIEW)
Fig. 1
(FRONT VIEW)
RED GREEN BLUE
BLUE
RED
GREEN GREEN
RED BLUE
BLUE GREEN RED
Fig.2
(FRONT VIEW)
RED GREEN BLUE BLUE GREEN RED
RED
GREEN
BLUE
BLUE
GREEN
RED
Fi
g
.
3

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17
PARTS LIST
CAUTION
zThe parts identified by the  symbol are important for the safety. Whenever replacing these parts, be sure to use
specified ones to secure the safety.
zThe parts not indicated in this Parts List and those which are filled with lines ------ in the Part No. columns will not be
supplied.
ABBREVIATIONS OF RESISTORS, CAPACITORS AND TOLERANCES
RESISTORS CAPACITORS
C R
F R
P R
V R
HV R
MF R
MG R
MP R
OM R
CMF R
UNF R
CH V R
CH MG R
COMP R
LPTC R
Carbon Resistor
Fusible Resistor
Plate Resistor
Variable Resistor
High Voltage Resistor
Metal Film Resistor
Metal Glazed Resistor
Metal Plate Resistor
Metal Oxide Resitor
Coating Metal Film Resistor
Non-Flammable Resistor
Chip Variable Resistor
Chip Metal Glazed Resistor
Composition Resistor
Linear Positive Temperature Coefficent
Resistor
C CAP
E CAP
M CAP
HV CAP
MF CAP
MM CAP
MP CAP
PP CAP
PS CAP
TF CAP
MPP CAP
TAN CAP
CH C CAP
BP E CAP
CH AL E CAP
CH AL BP CAP
CH TAN E CAP
CH AL BP E CAP
Ceramic Capacitor
Electrolytic Capacitor
Mylar Capacitor
High Voltage Capacitor
Metalized Film Capacitor
Metalized Mylar Capacitor
Metalized Polystyrol Capacitor
Polypropylene Capacitor
Polystyrol Capacitor
Thin Film Capacitor
Metalized Polypropylene Capacitor
Tantalum Capacitor
Chip Ceramic Capacitor
Bi-Polar Electrolytic Capacitor
Chip Alminum Electrolytic Capacitor
Chip Alminum Bi-Polar Capacitor
Chip Tantalum Electrolytic Capacitor
Chip Alminum Bi-Polar Electrolytic
Capacitor
TOLERANCES
F G J K M N R H Z P
±1% ±2% ±5% ±10% ±20% ±30% +30%
-10%
+50%
-10%
+80%
-20%
+100%
-0%

.
18
EXPLODED PARTS LIST
①
②
①
②
⑥
⑦
⑧
⑨⑫⑬
⑮
⑰
⑱
⑳

④⑤

.
19
Ref. No. Part Name. Part No. Model Q’ty
1 SPEAKER BOX RSR7.013.0136 C 2
2 SPEAKER BOX BRACKET RSR8.078.0331 C 2
3 IRON BRACKET FOR CRT RSR8.038.0233 C 4
4 DAMPER GEAR DP-1 C 1
5 DAMPER GEAR BRACKET RSR8.078.0161 C
6 FRONT CABINIT RSR8.074.0288 C 1
7 BACK CABINIT RSR8.074.0297 C 1
8 BACK TERMINAL BOARD E/RSR8.078.007 C 1
9 MAIN PWB FRAME RSAG8.078.116 C 1
1
0 POWER SWITCH KNOB RSR8.337.0309 C 1
1
1 KEY KNOB RSR8.337.0310 C 1
1
2 BACK TERMINAL PVC SHEET E/RSR8.808.132 T31 1
1
3 BACK TERMINAL PVC SHEET E/RSR8.808.133 V21
1
4 DOOR LID RSR8.632.0163 C 1
1
5 HANDLE BRACKET RSR8.634.0123 C 2
1
6 LED LENS RSR8.640.0182 C 1
1
7 HANDLE (R ) RSR8.671.0103 C 1
1
8 HANDLE (L) RSR8.671.0104 C 1
1
9 FRONT CONTROL PVC SHEET E/RSR8.808.131 C 1
2
0 SWMAIN POWER SWITCH(KDC-A04-11) KPW12HL057--B C 1
2
1 AC SWITCH BRACKET RSR8.038.0181 C 1
2
2 CRT A68QCP893X300 A68QCP893X300 C 1

.
20
PRINTED CIRCUIT BOARD PARTS
LIST
Model C: Common usage T31: PF-68T31 V21: PF-68V21
Symbol Name Part No Model
A 201 TUNER(9V 470M
38.9 B/G) BXATB026----S C
AS 8S SOCKET GACV8001----C C
AZ 2S SOCKET GAAV2001----C C
BC2 3S SOCKET GACV3001----C C
BM 3S SOCKET GABV3001----C C
BM1 3S SOCKET GABV3001----C C
BM-BM 2P
Connector(230mm) JS2231-B002-C C
BS 3S SOCKET GABV3001----C C
BS1 3S SOCKET GABV3001----C C
BS-BS 2P
Connector(230mm) JS2231-B002-C C
BX 8S SOCKET GACV8001----C C
C 1102 50V 0.01u CKF103Z1FA-FC T31 Z
C 1103 50V 0.01u CKF103Z1FA-FC T31 Z
C 1104 100v 10u CEC100MYACANP T31 M
C 1106 50V 56P CCF560J1CA-FC T31 J
C 1107 50V 56P CCF560J1CA-FC T31 J
C 1108 50V 0.01u CKF103Z1FA-FC T31 Z
C 1109 50v 2.2u CEF2R2MYACANP T31 M
C 1110 10v 100u CEB101MYACBNP T31 M
C 1112 100V 0.012u CFG123J1-H-NW T31 J
C 1701 250V 10u CEK100M1ACHNP C M
C 1702 500V 1000P CKP102K1BA-FC C K
C 1703 2KV 1000P CKX102P2EJ-ND C P
C 1706 50V 0.01u CKF103Z1FA-FC C Z
C 201 50V 27P CCF270J1CA-FC C J
C 203 50V 1000P CKF102K1BA-FC C K
C 206 50V 0.01u CKF103Z1FA-FC C Z
C 208 50V 4700P CKF472K1BA-FC C K
C 210 50V 1000P CKF102K1BA-FC C K
C 220 50V 1000P CKF102K1BA-FC C K
C 251 100v 10u CEC100MYACANP C M
C 252 100V 0.015u CFG153J1-H-NW C J
C 253 100v 10u CEC100MYACANP C M
C 255 100v 10u CEC100MYACANP C M
C 256 100v 10u CEC100MYACANP C M
C 257 50V 0.01u CKF103Z1FA-FC C Z
C 258 16v 100u CEC101MYACBNP C M
C 259 50V 100u CEF101M2ACENP C M
C 268 100v 10u CEC100MYACANP C M
C 301 50V 0.01u CKF103Z1FA-FC C Z
C 302 50V 1000P CKF102K1BA-FC C K
C 303 63V 0.1u CAY104K1-H-FC C K
C 304 50v 2.2u CEF2R2MYACANP C M
C 305 100V 0.022u CFG223J1-H-NW C J
C 306 50v 4.7u CEF4R7MYACANP C M
C 307 16v 100u CEC101MYACBNP C M
C 308 100V 0.022u CFG223J1-H-NW C J
C 309 63V 0.22u CAY224K1-H-FC C K
C 310 16v 47u CEC470MYACANP C M
C 3101 50V 1000P CKF102K1BA-FC T31 K
C 3102 50V 1000P CKF102K1BA-FC T31 K
C 3103 63V 0.22u CAY224K1-H-FC T31 K
C 3104 63V 0.1u CAY104K1-H-FC T31 K
C 3105 50v 2.2u CEF2R2MYACANP T31 M
C 3106 50v 2.2u CEF2R2MYACANP T31 M
C 3107 50V 47P CCF470J1CA-FC T31 J
C 3108 50V 0.01u CKF103Z1FA-FC T31 Z
C 3109 63V 0.22u CAY224K1-H-FC T31 K
C 3110 50V 47P CCF470J1CA-FC T31 J
C 3113 50V 0.01u CKF103Z1FA-FC T31 Z
C 3114 50v 2.2u CEF2R2MYACANP T31 M
C 3115 50v 2.2u CEF2R2MYACANP T31 M
C 3116 50V 1000P CKF102K1BA-FC T31 K
C 3117 50V 1000P CKF102K1BA-FC T31 K
C 3118 50V 0.01u CKF103Z1FA-FC T31 Z
C 3119 50V 0.01u CKF103Z1FA-FC T31 Z
C 3120 63V 0.47u CAY474K1-H-FC T31 K
C 3121 100V 6800P CFG682K1-H-NW T31 K
C 3122 50V 680P CKF681K1BA-FC T31 K
C 3123 100V 6800P CFG682K1-H-NW T31 K
C 3124 50V 680P CKF681K1BA-FC T31 K
C 3125 63V 0.47u CAY474K1-H-FC T31 K
C 3126 50V 47P CCF470J1CA-FC T31 J
C 3127 63V 0.47u CAY474K1-H-FC T31 K
C 3128 63V 0.47u CAY474K1-H-FC T31 K
C 3129 63V 0.47u CAY474K1-H-FC T31 K
C 3130 63V 0.47u CAY474K1-H-FC T31 K
C 3131 63V 0.47u CAY474K1-H-FC T31 K
C 3132 100V 4700P CFG472J1-H-NW T31 J
C 3133 63V 0.47u CAY474K1-H-FC T31 K
C 3134 16v 47u CEC470MYACANP T31 M
C 3135 16v 47u CEC470MYACANP T31 M
C 3136 16v 47u CEC470MYACANP T31 M
C 3137 50V 0.01u CKF103Z1FA-FC T31 Z
C 3138 50V 1000P CKF102K1BA-FC T31 K
C 3139 50V 1000P CKF102K1BA-FC T31 K
C 316 50v 1.0u CEF1R0MYACANP C M
C 317 50V 3300P CKF332K1BA-FC C K
C 318 100v 10u CEC100MYACANP C M
C 321 50v 4.7u CEF4R7MYACANP C M
C 322 100V 0.022u CFG223J1-H-NW C J
C 324 63V 0.1u CAY104K1-H-FC C K
C 326 63V 0.1u CAY104J1-H-FC C J
C 327 100v 10u CEC100MYACANP T31 M
C 330 16v 47u CEC470MYACANP C M
C 336 50V 680P CKF681K1BA-FC C K
C 337 50V 680P CKF681K1BA-FC C K
C 351 50v 1.0u CEF1R0MYACANP C M
C 352 50v 1.0u CEF1R0MYACANP C M
C 353 50V 0.01u CKF103Z1FA-FC C Z
C 354 50V 68P CCF680J1CA-FC C J
C 355 50V 47P CCF470J1CA-FC C J
C 3710 16v 100u CEC101MYACBNP C M
C 3711 50V 0.01u CKF103Z1FA-FC C Z
C 3725 50V 1000P CKF102K1BA-FC C K
C 3726 50V 1000P CKF102K1BA-FC C K
C 395 16v 100u CEC101MYACBNP C M
C 396 16v 220u CEC221MYACCNP C M
C 397 16v 330u CEC331MYACCNP C M
C 398 16v 330u CEC331MYACCNP C M
C 401 50V 220P CKF221K1BA-FC C K
C 402 50V 220P CKF221K1BA-FC C K
C 405 63V 0.1u CAY104K1-H-FC C K
C 406 50V 3300P CKF332K1BA-FC C K
C 407 50v 1.0u CEF1R0MYACANP C M
C 408 50V 2200P CKF222K1BA-FC C K
C 409 50V 1000P CKF102K1BA-FC C K
C 410 50V 4700P CKF472K1BA-FC C K
C 411 63V 0.1u CAY104K1-H-FC T31 K
C 412 63V 0.1u CAY104K1-H-FC T31 K
C 413 63V 0.1u CAY104K1-H-FC T31 K
C 414 100V 0.015u CFG153J1-H-NW C J
C 420 16v 470u CEB471MYACCNP C M
C 421 100v 10u CEC100MYACANP T31 M