SERVICE MANUAL
Models:
DA315BN6R
D21B8BN6R
I. Safety Instructions ..................................................................................................................2
II. Specifications..........................................................................................................................4
III. Level List of Equipments & Instruments Required for Production....................................6
IV.Applying Adhesive on Main PCB ..........................................................................................6
V. Wiring Diagram .......................................................................................................................7
VI.Block Diagram ........................................................................................................................8
VII.Disassembly ..........................................................................................................................9
VIII.Input Signals & Equipments List for Alignment .................................................................9
IX. E2PROM (IC602) Setting................................................................................................... 10
X. Electrical Adjustment .......................................................................................................... 12
XI.Transistor and IC Identification.......................................................................................... 16
XII.Schematic Diagram ............................................................................................................ 17
XIII.Component Diagrams....................................................................................................... 19
XIV.Exploded View Diagram and Parts List ........................................................................... 24
This manual is the latest at the time of printing, and does not include the modification which
may be made after the printing, by the constant improvement of product.
I. Safety Instructions
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
The lightning flash with arrowhead symbol,
within an equilateral triangle, is intended to alert
the user to the presence of uninsulated “dangerous
voltage” within the product’s enclosure that may
be of sufficient magnitude to constitute a risk of
electric shock to persons.
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR
BACK). NO USER-SERVICEABLE PARTS
INSIDE. REFER SERVICING TO QUALIFIED
SERVICE PERSONNEL ONLY.
PRECAUTIONS DURING SERVICING
1. In addition to safety, other parts and assemblies are
specified for conformance with such regulations as
those applying to spurious radiation. These must
also be replaced only with specified replacements.
Examples: RF converters, tuner units, antenna
selection switches, RF cables, noise-blocking
capacitors, noise-blocking filters, etc.
2. Use specified internal Wiring. Note especially:
1) Wires covered with PVC tubing
2) Double insulated wires
3) High voltage leads
3. Use specified insulating materials for hazardous
live parts. Note especially:
1) Insulating Tape
2) PVC tubing
3) Spacers (insulating barriers)
4) Insulating sheets for transistors
5) Plastic screws for fixing micro switches
4. When replacing AC primary side components
(transformers, power cords, noise blocking
capacitors, etc.), wrap ends of wires securely about
the terminals before soldering.
5. Make sure that wires do not contact heat generating
parts (heat sinks, oxide metal film resistors, fusible
resistors, etc.)
6. Check if replaced wires do not contact sharply edged
or pointed parts.
7. Make sure that foreign objects (screws, solder
droplets, etc.) do not remain inside the set.
MAKE YOUR CONTRIBUTION TO PROTECT
THE ENVIRONMENT
Used batteries with the ISO symbol
for recycling as well as small
accumulators (rechargeable batteries), mini-batteries
(cells) and starter batteries should not be thrown
into the garbage can.
Please leave them at an appropriate depot.
The exclamation point within an equilateral
triangle is intended to alert the user to the
presence of important operating and maintenance
(servicing) instructions in the literature accompanying the appliance.
WARNING:
Before servicing this TV receiver, read the X-RAY
RADIATION PRECAUTION, SAFETY INSTRUCTION
and PRODUCT SAFETY NOTICE.
X-RAY RADIATION PRECAUTION
1. Excessively high can produce potentially hazardous
X-RAY RADIATION. To avoid such hazards, the high
voltage must not exceed the specified limit. The
normal value of the high voltage of this TV receiver
is 27 KV at zero bean current (minimum brightness).
The high voltage must not exceed 30 KV under any
circumstances. Each time when a receiver requires
servicing, the high voltage should be checked. The
reading of the high voltage is recommended to be
recorded as a part of the service record, It is
important to use an accurate and reliable high
voltage meter.
2. The only source of X-RAY RADIATION in this TV
receiver is the picture tube. For continued X-RAY
RADIATION protection, the replacement tube must
be exactly the same type as specified in the parts
list.
3. Some parts in this TV receiver have special safety
related characteristics for X-RADIATION protection.
For continued safety, the parts replacement should
be under taken only after referring the PRODUCT
SAFETY NOTICE.
SAFETY INSTRUCTION
The service should not be attempted by anyone
unfamiliar with the necessary instructions on this TV
receiver. The following are the necessary instructions
to be observed before servicing.
1. An isolation transformer should be connected in the
power line between the receiver and the AC line
when a service is performed on the primary of the
converter transformer of the set.
2. Comply with all caution and safety related provided
on the back of the cabinet, inside the cabinet, on the
chassis or picture tube.
2
3. To avoid a shock hazard, always discharge the
picture tube's anode to the chassis ground before
removing the anode cap.
4. Completely discharge the high potential voltage of
the picture tube before handling. The picture tube is
a vacuum and if broken, the glass will explode.
5. When replacing a MAIN PCB in the cabinet, always
be certain that all protective are installed properly
such as control knobs, adjustment covers or shields,
barriers, isolation resistor networks etc.
6. When servicing is required, observe the original lead
dressing. Extra precaution should be given to assure
correct lead dressing in the high voltage area.
7. Keep wires away from high voltage or high tempera
ture components.
8. Before returning the set to the customer, always
perform an AC leakage current check on the exposed
metallic parts of the cabinet, such as antennas,
terminals, screwheads, metal overlay, control shafts,
etc., to be sure the set is safe to operate without
danger of electrical shock. Plug the AC line cord
directly to the AC outlet (do not use a line isolation
transformer during this check). Use an AC voltmeter
having 5K ohms volt sensitivity or more in the
following manner.
Connect a 1.5K ohm 10 watt resistor paralleled by a
0.15µF AC type capacitor, between a good earth
ground (water pipe, conductor etc.,) and the exposed
metallic parts, one at a time.
Measure the AC voltage across the combination of
the 1.5K ohm resistor and 0.15 uF capacitor. Reverse
the AC plug at the AC outlet and repeat the AC
voltage measurements for each exposed metallic
part.
The measured voltage must not exceed 0.3V RMS.
This corresponds to 0.5mA AC. Any value exceeding
this limit constitutes a potential shock hazard and
must be corrected immediately.
The resistance measurement should be done
between accessible exposed metal parts and power
cord plug prongs with the power switch "ON". The
resistance should be more than 6M ohms.
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this TV
receiver have special safety-related characteristics.
These characteristics are offer passed unnoticed by
visual spection and the protection afforded by them
cannot necessarily be obtained by using replacement
components rates for a higher voltage, wattage, etc.
The replacement parts which have these special
safety characteristics are identified by
the schematic diagram and on the parts list.
Before replacing any of these components, read the
parts list in this manual carefully. The use of
substitute replacement parts which do not have the
same safety characteristics as specified in the parts
list may create shock, fire, X-RAY RADIATION or
other hazards.
marks on
Good earth ground
such as the water
pipe, conductor, etc.
AC Leakage Current Check
AC VOLTMETER
Place this probe
on each exposed
metallic part
3
II. Specifications
1.Power supply TV : AC 220~240 V, 50Hz
Remote control battery: 3V (UM-3X2)
2.TV system RF input : PAL BG/DK, SECAM BG/DK
Video input : PAL/SECAM/NTSC 3.58/NTSC 4.43
3.Receiving channels VHF-L : E2-S9
VHF-H : S10-S40
UHF : S41-E69
4.Intermediate frequencies Picture : 38.9MHz
5.Scanning Horizontal (Hz) : 15625/15750
Vertical (Hz) : 50/60
6. Color picture tube: 14” 90 degree North(1) hemisphere Bv=-0.35G±0.2G
21” 90 degree North(3) hemisphere Bv=+0.35G±0.2G
7.Operating temperature Fulfil all specifications: 15°C ~ 35°C
Accept picture/tone reproduction: 5°C ~ 45°C
8. Operating relative humidity Fulfil all specifications: 45% ~ 75%
Accept picture/tone reproduction: 15% ~ 90%
9. Electrical & Optical Specification:
No. Items Instruction Typical Limit Unit
1 Video sensitivity For 30dB S/N VL ≤45 ≤48
VH ≤45 ≤48 dBuV
U ≤48 ≤51
2 FM sound sensitivity For 30dB S/N 30 ≤35 dBuV
3 Synchronizing sensitivity For RF transmission 25 ≤30 dBuV
4 Color sensitivity For RF transmission 32 ≤40 dBuV
5 Teletext sensitivity TV screen refreshes 40 times
number of mistakes ≤8 N/A N/A dBu
6 Minimum NICAM threshold Without crackline noise N/A N/A dBu
7 AGC static characteristic Accept. Picture/tone repr. 103 ≥100 dBu
8 Selectivity Adjacent sound carrier 40 ≥35
Below adjacent sound carrier 35 ≥30 dB
Adjacent picture carrier 50 ≥40
Up adjacent picture carrier 45 ≥30
9 IF rejection 55 ≥50 dB
10 Image rejection VHF 55 ≥50 dB
UHF 5 0 ≥45
11 AFT pull-in range M/N N/A N/A MHz
DK/BG ±1.5 ≥|±1.0|
12 Chroma sync pull-in range ±500 ≥|±200| Hz
13 Color killer function -25 ≤-16 dB
14 DC restoration 3 ≤10 %
15 Resolution Horizontal PAL/SECAM 320 ≥300
NTSC 270 ≥250
Vertical PAL/SECAM 410 ≥400 lines
NTSC 320 ≥300
16 Overscan Cross hatch signal 93 90~96 %
17 Linearity Horizontal 7 ≤10 %
Vertical 6 ≤8%
18 Pattern distortion 1.5 ≤3%
19 Picture position In all direction ±3 ≤|±6| mm
20 Raster rotation In all direction 4 ≤6mm
21 Convergence error 0.4 ≤0.6 %
22 White balance (8700°K) X 0.288 0.288±0.015
Y 0.298 0.298±0.015 /
23 Maximum full white At picture tube center 110 100 cd/m
24 H sync pull-in range ±500 ≥|±200| Hz
25 V sync pull-in range 7 ≥6Hz
26 Anode voltage 22 ≤25 KV (For A315)
24 ≤27.5 KV (For 21B8)
27 Audio frequence response ±3dB ref. to 1KHz 0.2~8 0.2~8 KHz
28 Audio output power 1KHz 10% THD 3.7x1 ≥3x1 W (For A315)
50KHz DEV. (BG/I/DK)
25KHz DEV. (M/N) 1.9x2 ≥1.5x2 W (For 21B8)
2
4
No. Items Instruction Typical Limit Unit
29 THD Po=0.5W 1KHz 1 ≤3%
30 Signal to buzz ratio 42 ≥40 dB
31 Minimum volume hum 6 ≤10 mVrms
32 Maximum woofer output power N/A N/A W
33 Woofer audio freqency response ±3dB ref. to 80Hz AV mode N/A N/A Hz
34 Bass control range 100Hz ref. to 1KHz AV mode N/A N/A dB
35 Treble control range 10KHz ref. to 1KHz AV mode N/A N/A dB
36 Balance Center N/A N/A
Max. N/A N/A dB
Min. N/A N/A
37 Volume control curve N/A /
38 Video input level 1.0 1±0.2 Vpp
39 Audio input level 0.5 0.5±0.3 Vrms
40 Video output level 1.0 1±0.2 Vpp
41 Audio output level 0.5 0.5±0.2 Vrms
42 Power consumpution Operating 65 ≤80 W (For A315)
75 ≤95 W (For 21B8)
(AT 220V AC) Stand by 10 ≤15 W
43 IR receiving distance ±30° 6 ≥4m
44 X-ray radiation <0.1 ≤0.5 mR/h
45 Dielectric strength AC 3KVrms 1min. 3 ≤5 mArms
Test Condition
1 Picture Modulation 87.5%
2 Sound Modulation 27KHz Dev. For DK/I/BG
15KHz Dev. For M/N
3 Picture to Sound Ration 10dB
4 Sound Artificial Load Resistor 8 ohm
+P8 P5+
+P1
+P4 P2++P0
+P7 P6+
+P3
5 Video signal White and black
(three white & two black)
6 Audio signal 1KHz sine wave 0.5Wrms
W
Convergence error test point on
7 Conditions of the TV setting:screen
A. Switch TV on and let it warm up for more than 30 minutes.
B. Connect RMS volt meter to speaker terminals and adjust theTV volume to get 500mW RMS power at each terminal.
C. Place the MINOLTA CA-100 test probe to white part of the screen,adjust the contrast until a reading of 80cd/m
D. Place the MINOLTA CA-100 test probe to black part of the screen,adjust the brightness until a reading of 2cd/m
E. Repeat step C & D until the exact luminance values is obtained or the nearest possible values you can get.then record the
luminance values & R.G.B gun voltage values at the same time. and take the largest values for measurement referenct.
F. Input standard color bar(100/0/75/0),then adjust the colour.until the waveforms at the blue gun of same level is obtained.
1/9H
1/9W
2
is obtained.
2
is obtained.
H
5
III. Level List of Equipments & Instruments Required for Production
No. Designation Requirement Reference Model Remark
1 Pattern Generator System of output signal: PHILIPS
RF out: PAL BG/SUB/DK/I, PM5518-TN
SECAM B/G/D/K, NTSC M PM5418-TN
Video out: NTSC 4.43/3.58 PAL 60Hz
2 Digital voltmeter Input Resistance 10M FLUKE 45
3 Withstanding Withstanding Voltage: KIKUSUI TOS 8650 Irresistible Voltage Measure
Voltage Tester AC 1.5KV, 5KV/0-5KV ± 3%
Cut-off current: AC 0-2mA,
20mA / continuously Adjustable
4 Insulation Tester Test voltage:1000V. 500V KIKUSUI TOS 7100L
5 Sine wave Signal Frequency Range: 0.1~140MHz LEADER 3216 For generating IF Signal
Generator ( Precision:10KHz )
Level Range: -20~126dB
6 Oscilloscope Frequency response: 20MHz or above
7 CRT Color MINOLTA CA-100 For White Balance Adjustment
Analyzer
8 DC Regulated Max output Voltage
Power Supply
9 Color Monitor AV receiving system: Should include Same model (of TV set) For operation check
all the AV output system of the as the products For resolution check
products at least. For Skew Check
10 Audio Signal Frequency of output signal: KENWOOD AG-203A For generating audio signal
Generator 20Hz-20kHz
14V Supply DC power
IV. Applying Adhesive on Main PCB
No. Description QTY Action Remark
1. Diabond 1603HFR lvoruy Adhesive 1 Apply Beside the Crystal oscillator
2. Diabond 1603HFR lvoruy Adhesive 1 Apply Beside the Capacitors which diameter 15MM
3. Diabond 1603HFR lvoruy Adhesive 1 Apply Beside the Capacitors which diameter 15MM
4. Diabond 1603HFR lvoruy Adhesive 1 Apply Beside the Capacitors which diameter 15MM
5. Diabond 1603HFR lvoruy Adhesive 1 Apply Beside the Capacitors which diameter 15MM
6. Diabond 1603HFR lvoruy Adhesive 1 Apply Beside the Capacitors which diameter 15MM
7. Diabond 1603HFR lvoruy Adhesive 2 Apply Beside the Coil
8. Diabond 1603HFR lvoruy Adhesive 2 Apply At the ends of each jumper wire
6
V. Wiring Diagram
7
VI. Block Diagram
8
VII. Disassembly
In case of trouble, etc., necessitating disassemble, please disassemble in the order shown in the illustrations. Reassemble in the reverse order.
1. Removal of the Back Cover
(for A315)
(for 21B8)
2. Removal of the MAIN PCB
a. Remove the screws.
b. Slide out the TV chassis slightly; pull up the connector of AC cord from PCB; pull up the CRT PCB from
CRT.
c. Remove the anode cap from the picture tube. To avaid a shock hazard, be sure to discharge the picture
tube’s anode to the chassis ground before removal.
d. Take out the TV chassis.
VIII. Input Signals & Equipments List for Alignment
A. Equipments for adjustment
a. Pattern generator(PHILIPS PM 5518) b. Digital voltmeter
c. High voltage meter d. Demagnetiser
e. Personal computer (486) f. CRT colour analyzer (MINOLTA CA-100)
g. High voltage probe
B. Input signals
a. Color bar b. Cross hatch
c. Grey scale bar d. Monoscope pattern
e. Circle cross pattern
9
IX. E2PROM setting
A. Details of tuning voltage, band, AFT, last position, volume, analog output, power status, colour system,
sound system and other setting data are stored in E
2
PROM.
B. Data Setting
2
Following data should be preset into the E
PROM IC before they are inserted to PCB.
Remark: * means this item can be adjusted according to the TV set’s status.
PARAMETER REMARK VALUE (HEX)
* RCUT R cut off 3F
* GCUT G cut off 3F
* BCUT B cut off 3F
* GDRV G drive 3F
* BDRV B drive 3F
* CNTX contrast Max. 7F
* BRTC bright center 3F
* COLC colour center NTSC 2E
* TNTC TINT center 3F
* COLP colour center PAL(Difference form COLC) 0F
* COLS colour center SECAM 3F
* SCOL sub color 04
* SCNT contrast 08
* CNTC contrast center 5F
* CNTN contrast minimum 12
* BRTX bright Max. (difference from center) 2F
* BRTN bright Min. (difference from center) 2F
* COLX colour Max. (difference from center) 2F
* COLN colour Min. 00
* TNTX TINT Max. (difference from center) 7F
* TNTN TINT Min. (difference from center) 7F
ST3 sharp center 3.58NTSC TV 20
SV3 sharp center 3.58NTSC VIDEO 20
ST4 sharp center other TV 20
SV4 sharp center other VIDEO 20
SVD sharp center DVD 19
ASSH asymmetry-sharpness 04
* SHPX sharpness Max. (difference from center) 3F
* SHPN sharpness Min. (difference from center) 1F
TXCX TEXT RGB contrast Max. 1F
RGCN TEXT RGB contrast Min. 00
ABL ABL data in detail 2A
DCBS a part of Video data in detail 33
CLTO the data when TV mode & 24
SOUND SYS != M 44
CLTO the data when TV mode & 44
SOUND SYS != M
CLVO the data when YUV mode & 45
SOUND SYS != M
CLVD the data when TV mode & 40
SOUND SYS = M
DEF a part of DEF COMP data in detail 01
AKB AKB system 00
SECD SECAM mode 08
* HP0S horizontal phase 0F
* VP50 vertical phase 50Hz 03
* HIT hight 50Hz 1 D
* HPS horizontal position 60Hz 02
(difference from HPOS)
* VP60 vertical position 60Hz 01
* HITS hight 60Hz (difference from HIT) 01
* VLIN V linearity 50Hz 04
* VSC VS correction 50Hz 00
* VLIS V linearity 60Hz (difference from VLIN) 00
* VSS VS correction 60Hz (difference from VSC) 00
* SBY SECAM B-Y black adjust 08
* SRY SECAM R-Y black adjust 08
* BRTS sub bright 00
* RAGC RF AGC adjustment 1A
BN6R
10
PARAMETER REMARK VALUE (HEX)
HAFC AFC gain 00
V25 volume 25 30
V50 volume 50 41
V100 volume 100 65
MUTT Y-mute for soft start 00
STAT contrast up for soft start 00
FLG0 flags for IF 84
FLG1 flags 04
REFP REF pulse position 00
RSNS R sens 00
GSNS G sens 00
BSNS B sens 00
MOD mode 30
STBY VCD/IF stanby 00
SVM SVM 00
VBLK V BLK start/stop 00
VCEN V centering 16
HSIZ H SIZE 00
PRBR parabola 00
TRUM trapzium 00
ECCT EW-corner correction (top) 00
ECCB EW-corner correction (bottom) 00
EHT V EHT / H EHT 24
UCOM micion control 00
PYNX normal H.SYNC max. 28
PYNN normal H.SYNC min 18
PYXS search H.SYNC max. 22
PYNS search H.SYNC min 1E
R CUTS YCbCr R cut off (difference from RCUT) 00
G CUTS YCbCr G cut off (difference from GCUT) 00
B CUTS YCbCr B cut off (difference from BCUT) 00
G DRVS YCbCr G drive (difference from GDRV) 00
B DRVS YCbCr B drive (difference from BDRV) 00
NOIS HAFC control 04
A OPT AKB option 06
AV OPT AV option 02
OPT2 LANG option A0
WAIT TIME Time used for open screen 00
CUR CEN Center position of the curtain 00
CUR STEP Open or close curtain step 01
AUSTP AUDIO step N/A
MODE 0 mode setting 1 2D
MODE 1 mode setting 2 85
* OSDF OSD PLL data 58
* OSD OSD horizontal position 14
OPT optional setting 67
BN6R
Remark: The items with “ * ” mean that they can be adjusted.
11
X. Electrical Adjustment
i. +B Voltage Alignment
a. Preparation Procedure.
1. Turn the TV set on and set it to TV mode with colour bar signal.
2. Press the key “I.P.C.” on the remote handset to select “MEMORY 1” mode.
3. Connect digital voltmeter between a terminal of C923 (+B) and GND.
b. Adjustment step
Adjust RP901 to make the read-out on the voltmeter to be 105±0.5VDC(Except 2109/W3BN65 106±0.5VDC).
RP901
C923
ii. Adjust for V-centre
a. Adjustment for 50Hz V-centre
1. Receive
2. Press the “FACTORY” key on the service remote handset.
3. Press “P+/P-” key to select VP50 adjustment.
4. Press “V+/V-” key to get a good V-Centre picture, as shown in Fig.2.
b. Adjustment for 60Hz V-centre
1. Receive
2. Press the “FACTORY” key on the service remote handset.
3. Press “P+/P-” key to select VP60 adjustment.
4. Press “V+/V-” key to get a suitable V-Centre for NTSC system, as shown in Fig.2.
(Circle +Cross) pattern signal (PAL, DK system).
(Circle +Cross) pattern signal (NTSC 3.58 system) (AV INPUT).
(Fig.1)
12
(Fig.2)
iii. H-C Adjustment
a. Adjustment for 50Hz H-centre.
1. Receive cross hatch pattern of PAL/DK system.
2. Press the “FACTORY” key to enter adjust menu.
3. Press “P+/P-” key to select HPOS adjustment.
4. Press “V+/V-” key on the remoter, until the horizontal centre of the picture is at the horizontal centre of
the CRT screen.
b. Adjustment for 60Hz H-centre.
1. Receive cross hatch pattern of NTSC 3.58 system.
2. Press the “FACTORY” key to enter adjust menu.
3. Press “P+/P-” key to select the “HPS” adjustment, then press the “V+/V-” key until the horizontal centre
is OK.
iv. Vertical Linearity
1. Enter adjustment menu.
2. Receive 50Hz cross hatch & circle patten “
3. Press the “P+/P-” keys to select “VLIN” adjustment.
4. Press the “V+/V-” key until the vertical Linearity is OK.
5. Input NTSC 3.58 “
6. Press the “P+/P-” key to select “VLIS” adjustment.
7. Press the “V+/V-” key until the vertical Linearity is OK.
v. Adjustment for Vertical S correction
1. Enter adjustment menu.
2. Receive 50Hz cross hatch & circle patten “
3. Press the “P+/P-” key to select “VSC” adjustment.
4. Press the “V+/V-” key until the vertical S-feature is OK.
” w/o “WHITE” pattern (AV INPUT).
” w/o “WHITE” pattern.
” w/o “WHITE” pattern.
vi. V-A (Vertical Amplitude) Adjustment
1. Enter adjustment menu as above described.
2. Receive 50Hz cross hatch & circle patten “
3. Press the “P+/P-” key on the remote to select “HIT” adjustment.
4. Press the “V+/V-” key until the vertical amplitude is OK.
5. Input NTSC 3.58 cross hatch & circle patten “
6. Press the “P+/P-” key to select “HITS” adjustment.
7. Press the “V+/V-” key until the vertical amplitude is OK.
vii. Adjustment of RF AGC
1. Receive RF signal (62±2dBµV).
2. Enter the AGC adjustment menu.
Press the “P+/P-” key to select ”RAGC”.
3. Press the “V+/V-” key to change the value of RFAGC until snow noise on the screen just disappeared.
” w/o “WHITE” pattern.
” w/o “WHITE” pattern (AV INPUT).
13
B. Whole unit adjustment
Warm up product for 30 minutes or more and demagnetize CRT fully with a demagnetizer before
following adjustment.
No. Adjustment item Preparation procedure Adjustment step Remark
1 White balance 1. Input a Black-White 1. Press MUTE 3 key on remote
& sub-brightness pattern signal to the control handset to display a
Adjustment TV set. horizontal line on screen.
2. Press IPC key on 2. Adjust the screen knob on FBT
remote control handset until the horizontal line on screen
to set the TV set to just can be seen.
memory 1 state. 3. Press MUTE 3 key again to resume
3. Press D-mode key on the Black-White picture.
remote control handset 4. Adjust BCUT and GCUT (when the
to enter the factory appeared horizontal line is red in
menu (D-mode). step 2) or RCUT an BCUT (when
the appeared line is green in step
2) or RCUT and GCUT (when the
appeared line is blue in step 2) to
obtain a expectant color coordinate
while the picture brightness is
about 3 nit.
5. Adjust BDRV and GDRV to obtain
a expectant color coordinate while
the picture brightness is about 80
nit.
6. Repeat step 4 and step 5 until
the expectant color coordinate is
obtained.
7. Repeat step 1, step2 and step 3.
8. Change the input signal to a grey
scale pattern signal and adjust
BRTS to 8 grey step can be identified.
9. Press D-mode key to quit.
2 Adjust for Focus 1. Receive crosshatch Adjust the knob “FOCUS” on FBT to
pattern. make the picture on the screen to be
2. Press key “I.P.C.” on the most distinct.
handset to select
“MEMORY 1” mode.
14
C. +B Check
1. Turn the TV set on and set it to TV mode with colour bar signal.
2. Press the key “I.P.C” on the remote handset to select: “MEMORY 1” mode.
3. Connect digital voltmeter between a terminal of C923(+B) and GND.
4. Adjust RP901 to make the read-out on the voltmeter to be 105±3.0VDC.
D. Colour purity and convergence adjustment
i. Colour purity adjustment (See Fig.3)
BEFORE ANY ADJUSTMENTS DESCRIBED BELOW ARE ATTEMPTED, V-HIGH, B+
VOLTAGE AND FOCUSING ADJUSTMENT MUST BE COMPLETED.
1. Place the TV receiver facing NORTH or SOUTH.
2. Plug in TV receiver and turn it on.
3. Operate the TV receiver over 30 minutes.
4. Fully degauss the TV receiver by using an external degaussing coil.
5. Receive a crosshatch pattern and adjust the static convergence control roughly.
6. Loosen the clamp screw of the deflection yoke and pull the deflection yoke towards you.
7. Enter ADJUST MENU. Set the values of RCUT, GCUT, BCUT to "IF".
8. Adjust the purity magnets until green field is obtained at the center of the screen.
9. Slowly push the deflection yoke toward bell of CRT and set it where a uniform green field is obtained.
10. Tighten the clamp screw of the deflection yoke.
ii. Convergence Adjustment (See Fig.3)
1. Receive a dotted pattern.
2. Unfix the convergence magnet clamp and align
red with blue dots at the center of the screen by
rotating (R,B) static convergence magnets.
3. Align Red/Blue with green dots at the center
of the screen by rotating (RB-G) station convergence magnets.
4. Fix the convergence magnets by turning the
clamp.
5. Remove the DY wedges and slightly tilt the
deflection yoke horizontally and vertically to
obtain the good overall convergence.
6. Fix the deflection yoke by wedges.
7. If purity error is found, follow “PURITY
ADJUSTMENT” instructions.
15
(Fig.3)
XI. Transistor and IC Identification
A. Main Unit:
B. Remote Control Handset:
16
XII. Schematic Diagram
i. For A315
(Please refer to 21A9-009.pdf)
17
ii. For 21B8
(Please refer to 21A8-008.pdf)
18
XIII. Component Diagrams
i. Main PCB Component Diagram (Top view)/(Bottom view) (For A315)
(Please refer to E3701-032010A/B.pdf)
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ii. Main PCB Component Diagram (Top view)/(Bottom view) (For 21B8)
(Please refer to E3701-022010A2/B2.pdf)
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iii. CRT PCB Component Diagram (Top view)/(Bottom view)
(Please refer to E3701-021080.pdf)
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iv. POWER & AVSIDE & KEY PCB Component Diagram (Top view)/(Bottom view) (For 21B8)
(Please refer to E3701-011090A2/B2/C2.pdf)
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v. HANDSET PCB Component Diagram (Top view)/(Bottom view)
(Please refer to E3741-033010.pdf)
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XIV. Exploded View Diagram and Parts List
A. TV unit
i. For A315
Item Part No. Description QT Y.
1 389- Phone Cover Sheet 1
2 486- NPM 1
3 279- Power Knob 1
4 477- Spring Wire CMP 1
5 200- Cabinet Front 1
6 269- Lens SNSR RCN 1
7 269- Lens LED 1
8 277- Function Knob 1
9 612- Self-tapping screw 2
10 254- AC Line Cord Clip 1
11 376- Rubber Ring 4
12 102- 14” CRT 1
13 E 1 115- Coil Degauss 1
14 639- Special Washer CRT 4
15 614- Self-tapping screw 4
16 779- CRT PCB Ass’y 1
17 202- Cabinet Back 1
18 614- Self-tapping screw 2
Item Part No. Description QT Y.
19 614- Self-tapping screw 1
20 560- Model Lable 1
21 614- Self-tapping screw 2
22 6 11- Self-tapping screw 1
23 389- Cover Plate 1
24 249- Special Plastic Clip DC 2
25 477- CRT Spring 1
26 E3421- Wire Ass’y 1
27 289- Plastic Ring Protective 2
28 241- Adaptor for power switch 1
29 250- Led and sensor holder 1
30 774- 1 Chip Speaker Ass’y 1
31 521- Felt Paper 2
32 771- Main PCB Ass’y 1
33 530- Fire Paper Washer 1
34 612- Self-tapping screw 1
35 389- Plate Tuner 1
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ii. For 21B8
Item Part No. Description Qty.
1 200- CAB. Front Blk 1
2 Speaker 2
3 615- S-TAP Screw BWH 4x14 8
4 E3701- KEY PCB Ass’y 1
5 614- S-TAP Screw BID 4x10 2
6 254- CLP CRD PER 8714 1
7 AC Power Line 1
8 376- Rubber Ring (T=2.0mm) 4
9 21” Colour CRT 1
10 639- Special Washer CRT 4
11 614- S-TAP Screw BID 4x30 4
12 249- Special Plastic Part 2
13 E3701- CRT PCB 1
14 202- Back Cabinet Black HI-PS 1
15 614- S-TAP Screw B/T 5x25mm Black 6
16 560- Model Label 1
17 614- S-TAP Screw B/T 4x12mm White 1
18 611- S-TAP Screw FL T 3x10 2
19 389- RCA Plate 1
20 477- SPG+CRT 1
21 389- Protect Ring 1
Item Part No. Description Qty.
22 E3701- Mian PCB 1
23 614- S-TAP Screw BID 4x16 3
24 614- S-TAP Screw BID 4x10 4
25 614- S-TAP Screw BID 5x20 4
26 230- Front Panel (B) 1
27 234- SUB Panel 1
28 614- S-TAP Screw BID 4x10 2
29 530- Fiber Paper 4
30 E3701- AV PCB 1
31 237- AV Cover Plate 1
32 379- Special Rubber Parts SPK 8
33 379- Special Rubber Parts SPK 8
34 486- Name Plate 1
35 279- Power Knob 1
36 477- SPG+ CRT 1
37 269- Sensor Lens 1
38 269- Led Lens 1
39 241- Power Adapter 1
40 E3701- Power PCB 1
41 615- Screw 4x14 2
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B. Remote handset (790-0035xx-xx)
Ref. No. Part No. Description QTY.
1 201-003501-XXS CAB TOP 1
2 373-003501-XXY KYPD RCN 1
3 E3741- KEY PCB 1
4 472-003301-01B PLT BAT “-” 1
5 472-003302-01B PLT BAT “+” 1
6 203-003501-XXS CAB BM 1
7 610-200206-10 SCREW 2.0x6.0 1
8 477-003301-01 SPG BAT + - 1
9 210-003501-XXS CV BAT 1
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