SERVICE MANUAL

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. E

2

PROM (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

Models:

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.

2

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.

I. Safety Instructions

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.

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.

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 accompa-
nying the appliance.

CAUTION: TO REDUCE THE RISK OF ELEC-
TRIC SHOCK, DO NOT REMOVE COVER (OR
BACK). NO USER-SERVICEABLE PARTS
INSIDE. REFER SERVICING TO QUALIFIED
SERVICE PERSONNEL ONLY.

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

3

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

marks on

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.

Good earth ground
such as the water
pipe, conductor, etc.

Place this probe
on each exposed
metallic part

AC VOLTMETER

AC Leakage Current Check

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.

4

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

50

≥

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

≤

6

mm

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

2

24

H sync pull-in range

±500

≥

|±200|

Hz

25

V sync pull-in range

7

≥

6

Hz

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)

5

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

≥

4

m

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

5

Video signal

White and black
(three white & two black)

6

Audio signal

1KHz sine wave 0.5Wrms

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

2

is obtained.

D. Place the MINOLTA CA-100 test probe to black part of the screen,adjust the brightness until a reading of 2cd/m

2

is obtained.

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.

W

H

1/9H

1/9W

+P8

P5+

+P7

P6+

+P1

+P3

+P4

P2+

+P0

6

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 14V

Supply DC power

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

III. Level List of Equipments & Instruments Required for Production

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

7

V. Wiring Diagram

8

VI. Block Diagram

9

VII. Disassembly

In case of trouble, etc., necessitating disassemble, please disassemble in the order shown in the illustrations. Reas-

semble in the reverse order.
1.

Removal of the Back Cover

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

(for 21B8)

(for A315)

10

IX. E

2

PROM 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

Following data should be preset into the E

2

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)

BN6R

* 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

1D

* 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

11

Remark:

The items with “ * ” mean that they can be adjusted.

PARAMETER

REMARK

VALUE (HEX)

BN6R

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

12

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).

ii. Adjust for V-centre
a. Adjustment for 50Hz V-centre

1.

Receive

(Circle +Cross) pattern signal (PAL, DK system).

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

(Circle +Cross) pattern signal (NTSC 3.58 system) (AV INPUT).

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.

(Fig.2)

(Fig.1)

RP901

C923

13

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 “

” w/o “WHITE” pattern.

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 “

” w/o “WHITE” pattern (AV INPUT).

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 “

” w/o “WHITE” pattern.

3.

Press the “P+/P-” key to select “VSC” adjustment.

4.

Press the “V+/V-” key until the vertical S-feature is OK.

vi. V-A (Vertical Amplitude) Adjustment

1.

Enter adjustment menu as above described.

2.

Receive 50Hz cross hatch & circle patten “

” w/o “WHITE” pattern.

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 “

” w/o “WHITE” pattern (AV INPUT).

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.

14

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.

15

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 con-
vergence 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.

(Fig.3)

16

XI. Transistor and IC Identification

A. Main Unit:

B. Remote Control Handset:

17

XII. Schematic Diagram

(Please refer to 21A9-009.pdf)

i.

For A315

18

(Please refer to 21A8-008.pdf)

ii. For 21B8

19

XIII. Component Diagrams

i. Main PCB Component Diagram (Top view)/(Bottom view)

(For A315)

(Please refer to E3701-032010A/B.pdf)

20

ii. Main PCB Component Diagram (Top view)/(Bottom view)

(For 21B8)

(Please refer to E3701-022010A2/B2.pdf)

21

iii. CRT PCB Component Diagram (Top view)/(Bottom view)

(Please refer to E3701-021080.pdf)

22

iv. POWER & AVSIDE & KEY PCB Component Diagram (Top view)/(Bottom view)

(For 21B8)

(Please refer to E3701-011090A2/B2/C2.pdf)

23

v. HANDSET PCB Component Diagram (Top view)/(Bottom view)

(Please refer to E3741-033010.pdf)

24

A. TV unit

i. For A315

XIV. Exploded View Diagram and Parts List

Item

Part No.

Description

QTY.

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

E1115-

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

QTY.

19

614-

Self-tapping screw

1

20

560-

Model Lable

1

21

614-

Self-tapping screw

2

22

611-

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

25

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 FLT 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

26

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