Panasonic tc 14rm10lp, tc 20rm10lp, tc 20ra10lp Diagram

Order DCS - JUL2005 - 003 - MS

Service Manual

Color Television

TC-14RM10LP
TC-20RM10LP
TC-20RA10LP

GP31 Chassis

Specifications

TELEVISOR

Power source
Consumption

Antenna input jack
Color system
Tuning system
Channel capability

Picture Tube

Audio Output
A V Terminals
Dimension (LxAxP)
Weight

TC-14RM10LP

127V / 220V AC, 50/60Hz
AC AUTO

51W
75Ω - VHF/UHF/CATV
PAL-M / NTSC / P AL-N
(FST)
VHF: 2 ~13

UHF: 14 ~ 69
CATV : 1 ~ 125

PANABLACK
14” CRT, 36cm (NBR5258)

Measured diagonally

33cm
8 W max (PMPO)
1 (rear)
370 x 352 x 372 mm
9,6 Kg

TC-20RM10LP

127V / 220V AC, 50/60Hz
AC AUTO

61W
75Ω - VHF/UHF/CATV
PAL-M / NTSC / P AL-N
(FST)
VHF: 2 ~13

UHF: 14 ~ 69
CATV : 1 ~ 125

PANABLACK
20” CRT, 51cm (NBR5258)

Measured diagonally

48cm
13 W max (PMPO)
1 (rear)
514 x 468x 461mm
17,0 Kg

TC-20RA10LP

127V / 220V AC, 50/60Hz
AC AUTO

61W
75Ω - VHF/UHF/CATV
PAL-M / NTSC / P AL-N
(FST)
VHF: 2 ~13

UHF: 14 ~ 69
CATV : 1 ~ 125

PANABLACK
20” CRT, 51cm (NBR5258)

Measured diagonally

48cm
13 W max (PMPO)
1 (front), 1 (rear) 1 (Head Phone)
514 x 468x 461mm
17,0 Kg

REMOTE CONTROL TRANSMITER:

TNQ2B2502-1

Model:
Power source: 3V (2 AA type batteries)
Infrared Length: 9500 Å (angstron)

SUPPLIED ACCESSORIES:

• 1 Remote Control Transmitter

• 1 300Ω/75Ω Adaptor Ballum

• 2 “AA” type batteries

• 1 internal antenna

© 2005 Panasonic da Amazônia S/A.

CS Division
Technical Support

TC-14RM10LP/ TC-20RM10LP/ TC-20RA10LP

Important Safety Notice

Special components are used in this television set which are important for safety. These parts are identified on the schematic
diagram by the symbol . It is essential that these critical parts are replaced with the manufacturer’s specified replacement
parts to prevent X-ray radiation, shock, fire or other hazards. Do not modify the original design without manufacturer’s permission.

!

Contents

ABOUT LEAD FREE SOLDER (PBF) ...................................................... 3

SUGGESTED PBF SOLDER .................................................................. 3

HOW TO RECOGNIZE THA T PB FREE SOLDER IS USED ....................... 3

OPERA TING INSTRUCTIONS ................................................................. 4

IC601 - PINOUT .................................................................................... 5

IC VOLTAGE TABLES ........................................................................... 6

IC601 - BLOCK DIAGRAM .................................................................... 7

GP31 CHASSIS FEATURE SUMMAR Y .................................................. 8

DAC CONTROL FOR GP31 CHASSIS FUNCTIONS AND ADJUSTMENTS ....... 9

HOW TO RESET THE UNIT (SELF CHECK) ............................................. 9

HOW TO ENTER IN THE SERVICE MODE ............................................... 9

CHK1 MODE - OPTIONS ....................................................................... 9

CHK2 MODE - VCJ ADJUSTMENTS ..................................................... 10

CHK3 MODE - PINCUSHION ADJUSTMENTS ....................................... 10

CHK4 MODE - WHITE BALANCE ADJUSTMENTS ............................... 10

TEST AND MEASUREMENT EQUIPMENTS ........................................... 10

EEPROM MEMORY MAPS .................................................................... 11

ADJUSTMENTS ..................................................................................... 13

SCHEMATICS DIAGRAMS ..................................................................... 18

CRT P.C.B. ............................................................................................ 18

MAIN P .C.B. SCHEMA TIC DIAGRAM ................................................... 19

MAIN P .C.B. CIRCUIT LA YOUT ............................................................. 20

SIGNAL WA VEFORM ............................................................................ 21

EXPLODED VIEW .................................................................................. 25

REPLACEMENT MECHANICAL PARTS LIST ........................................ 26

REPLACEMENT ELECTRICAL P ARTS LIST .......................................... 27

General Guidelines

An Isolation Transformer should always be used during the servicing
of a receiver whose chassis is not isolated from the AC power line.
Use a transformer of adequate power rating as this protects the
technician from accidents resulting in personal injury from electrical
shocks. It will also protect the Receiver from being damaged by
accidental shorting that may occur during servicing.
When servicing, observe the original lead dress, especially in the high
voltage circuit. Replace all damaged parts (also parts that show signs
of overheating.)
Always Replace Protective Devices, such as fishpaper, isolation
resistors and capacitors, and shields after servicing the Receiver.
Use only manufacturer’s recommended rating for fuses, circuit
breakers, etc.
High potentials are present when this Receiver is operating. Operation
of the Receiver without the rear cover introduces danger from electrical
shock. Servicing should not be performed by anyone who is not
thoroughly familiar with the necessary precautions when servicing
high-voltage equipment.
Extreme care should be practiced when Handling the Picture Tube.
Rough handling may cause it to implode due to atmospheric pressure
(14.7 lbs per sq. in). Do not sick or scratch the glass or subject it to
any undue pressure. When handling, use safety goggles and heavy
gloves for protection. Discharge the picture tube by shorting the anode
to chassis ground (not to the cabinet or to other mounting hardware).
When discharging, connect cold ground (i.e. dag ground lead) to the
anode with a well insulated wire or use a grounding probe.
Avoid prolonged exposure at close range to unshielded areas of the
picture tube to prevent exposure to X-ray radiation.
The Test Picture Tube used for servicing the chassis at the bench
should incorporate safety glass and magnetic shielding. The safety
glass provides shielding for the tube viewing area against X-ray radiation
as well as implosion. The magnetic shield limits X-ray radiation around
the bell of the picture tube in addition to restricting magnetic effects.
When using a picture tube test jig for service, ensure that the jig is
capable of handling 31kV without causing X-ray radiation.
Before returning a serviced receiver to the owner, the service
technician must thoroughly test the unit to ensure that is completely
safe to operate. Do not use a line isolation transformer when testing.

- 2 -

!

Warning !

It is essential that these critical parts are replaced
with the manufacturer’s specified replacement parts
to prevent X-ray radiation, shock, fire or other haz­ards.

TC-14RM10LP/ TC-20RM10LP/ TC-20RA10LP

ABOUT LEAD FREE SOLDER (PbF)

Note:

In the information below, Pb, the symbol for lead in the periodic table of elements, will refer to standard solder or solder that
contains lead.
We will use PbF solder when discussing the lead free solder used in our manufacturing process which is made from Tin (Sn),
Silver, (Ag), and Copper, (Cu).
This model, and others like it, manufactured using lead free solder will have PbF stamped on the PCB. For service and repair
work we suggest using the same type of solder although, with some precautions, standard Pb solder can also be used.

Caution

• PbF solder has a melting point that is 50° ~ 70° F, (30° ~ 40°C) higher than Pb solder. Please use a soldering iron with
temperature control and adjust it to 700° ± 20° F, (370° ± 10°C).In case of using high temperature soldering iron, please be
careful not to heat too long.

• PbF solder will tend to splash if it is heated much higher than its melting point, approximately 1100°F, (600°C).

• If you must use Pb solder on a PCB manufactured using PbF solder, remove as much of the original PbF solder as possible
and be sure that any remaining is melted prior to applying the Pb solder.

• When applying PbF solder to double layered boards, please check the component side for excess which may flow onto the
opposite side (See figure, below).

SUGGESTED PbF SOLDER

There are several types of PbF solder available commercially. While this product is manufactured using Tin, Silver, and Copper,
(Sn+Ag+Cu), you can also use Tin and Copper, (Sn+Cu), or Tin, Zinc, and Bismuth, (Sn+Zn+Bi). Please check the manufac
turer’s specific instructions for the melting points of their products and any precautions for using their product with other
materials.
The following lead free (PbF) solder wire sizes are recommended for service of this product: 0.3mm, 0.6mm and 1.0mm.

HOW TO RECOGNIZE THAT PB FREE SOLDER IS USED

P.C.Boards marked as “PbF” use Pb Free solder. (See the figure below.) Pb Free is not used the Power Supply Board of this
unit.
(Example : Digital Board)

L624
L625
L626

L660

L661

L658

L659

100

C694

L653

L655

L657

L654

L656

1

L642

R768

L605

H

RA602

PFUP1330YA PbF

R767

R769

L606

L604

Q609

75

76

IC605

2625

C666

L643

BAT600

R70

C738

51
50

C667

RA609

D602

C668

RA610

C672

C731

L620

L619

L618

+3.3V/BAT

J600

C717

L621

R723

L630

1

R708

8

C728

IC610

+24V

CN612

16

9

Q613

E

R736

F605

25

18

R613R610

R611

R737

E

Q620

D608

C726

D607

Marked

DIGITAL BOARD COMPONENT VIEW

- 3 -

TC-14RM10LP/ TC-20RM10LP/ TC-20RA10LP

OPERATING INSTRUCTIONS

CHANNELS

KEYBOARD FOR

DIRECT SELECTION

123

456

u

WAKE UP

789

R-TUNEWAKE UPTV/AV

0

R-TUNE

CLOSED CAPTION

CC

CH

e

CHANNELS

SELECTION AND

MENU NAVIGATION

MAIN MENU

N

CH

VOL? VOL+

PIC MENU

MAIN MENU

Panasonic

Remote Control

LOCATION OF CONTROLS

Rear View

POWER

TIMER

MUTE

TV/AV

RECALL

NORMALIZATION

VOLUME

AND MENU

NAVIGATION

input jack

AUDIO

VIDEO

AV IN

Audio/Video

Antenna

input jack

(only for

TC-20RA10LP)

AUDIO

VIDEO

PIC MENU

–+

MENU TV/AV

( ) ( )

Channel buttons

(–) (+)

Volume buttons

TV/AV button

MENU button

sensor

Remote control

Indication light

(ON/STAND BY)

Power

switch

TC-14RM10LP / TC-20RM10LP / TC-20RA10LP REMOTE CONTROL

Front V ie w

- 4 -

TC-14RM10LP/ TC-20RM10LP/ TC-20RA10LP

IC601 - PINOUT

Symbol Pin

P3.1/ADC1 1 port 3.1 or ADC1 input
P3.2/ADC2 2 port 3.2 or ADC2 input
P3.3/ADC3 3 port 3.3 or ADC3 input
VSSC/P 4 digital ground for m-Controller core and periphery
P0.5 5 port 0.5 (8 mA current sinking capability for direct drive of LEDs)
P0.6/CVBSTD 6 port 0.6 (8 mA current sinking capability for direct drive of LEDs) or Composite video input. A positive-going
VSSA 7 digital ground of TV-processor
SECPLL 8 SECAM PLL decoupling
VP2 9 2nd supply voltage TV-processor (+8V)
DECDIG 10 supply voltage decoupling of digital circuit of TV-processor
PH2LF 11 phase-2 filter
PH1LF 12 phase-1 filter
GND3 13 ground 3 for TV-processor
DECBG 14 bandgap decoupling
AVL 15 Automatic volume levelling
VDRB 16 vertical drive B output
VDRA 17 vertical drive A output
IFI N1 18 IF input 1
IFI N2 19 IF input 2
IREF 20 reference current input
VSC 21 vertical sawtooth capacitor
AGCOUT 22 tuner AGC output
NC 23 Not connected
NC 24 Not connected
GND2 25 ground 2 for TV processor
SNDPLL 26 narrow band PLL filter
IC 27 Inter nally connected
AUDIO2 28 audio 2 input
AUDIO3 29 audio 3 input
HOUT 30 horizontal output
FBISO 31 flyback input/sandcastle output
DECSDEM 32 decoupling sound demodulator
AUDEEM 33 Deemphasis (front-end audio out)
EHTO 34 EHT/overvoltage protection input
PLLIF 35 IF-PLL loop filter
IC SIF AGC 36 AGC Sound
IC 37 Internally connected
IFVO/SVO 38 IF video output / selected CVBS output
VP1 39 main supply voltage TV processor
CVBS1 40 internal CVBS input
GND 41 ground for TV processor
CVBS2 42 external CVBS2 input
GND 43 ground for TV-processor
CVBS3/Y 44 CVBS3/Y input
C 45 chroma input
WHSTR 46 white stretch capacitor
CVBSO 47 CVBS output
AUDOUT 48 Audio output
NC 49 Not connected
INSSW2 50 2nd RGB / YUV insertion input
R2/VIN 51 2nd R input / V (R-Y) input / PR input
G2/YIN 52 2nd G input / Y input
B2/UIN 53 2nd B input / U (B-Y) input / PB input
BCLIN 54 beam current limiter input
BLKIN 5 5 black current input / V-guard input
RO 56 Red output
GO 57 Green output
BO 58 Blue output
VDDA 59 analog supply of Teletext decoder and digital supply of TV-processor (3.3 V)

Description

- 5 -

TC-14RM10LP/ TC-20RM10LP/ TC-20RA10LP

IC601 - PINOUT

Symbol Pin

VP E 60 OTP Programming Voltage
VDDC 61 digital supply to core (3.3 V)
OSCGND 62 oscillator ground supply
XTALIN 63 crystal oscillator input
XTALOUT 64 crystal oscillator output
RESET 65 reset
VDDP 66 digital supply to periphery (+3.3 V)
P1.0/INT1 67 port 1.0 or external interrupt 1 input
P1.1/T0 68 port 1.1 or Counter/Timer 0 input
P1.2/INT0 69 port 1.2 or external interrupt 0 input
P1.3/T1 70 port 1.3 or Counter/Timer 1 input
P1.6/SCL 71 port 1.6 or I2C-bus clock line
P1.7/SDA 72 port 1.7 or I2C-bus data line
P2.0/TPWM 73 port 2.0 or Tuning PWM output
P2.1/PWM0 74 port 2.1
P2.2/PWM1 75 port 2.2
P2.3/PWM2 76 port 2.3
P2.4/PWM3 77 port 2.4
P2.5/PWM4 78 port 2.5
SYN C FI L TER 79 Sync Filter
P3.0/ADC0 80 port 3.0 or ADC0 input

Description

IC VOLTAGE TABLES

Pin Vol tage

1 3,3
2 5,0
3 1,8
40
5 4,5
60
70
8 2,3
9 8,0
10 5,0
11 3,2
12 4,0
13 0
14 4,0
15 0,2
16 1,3
17 1,3
18 1,9
19 1,9
20 4,0
21 3,8
22 0
23 0
24 0
25 0
26 0
27 2,5
28 3,7
29 3,7
30 0,6
31 0,6
32 2,2
33 3,1
34 1,6
35 1,5
36 2,4
37 1,5
38 2,8
39 8,0
40 3,6

IC601

Pin Vol tage

41 0
42 3,8
43 0
44 3,3
45 0
46 3,5
47 3,0
48 3,3
49 0
50 2,5
51 2,5
52 2,5
53 2,5
54 2,0
55 5,3
56 4,0
57 3,8
58 3,8
59 3,3
60 0
61 3,3
62 0
63 1,6
64 1,6
65 0
66 3,3
67 3,3
68 5,0
69 5,0
70 3,2
71 0
72 5,0
73 0
74 0,2
75 0
76 0
77 0
78 0
79 0
80 0

IC451

Pin Vol tage

1 0,3V
2 0,14V
3 -12V
4 -14V
50V
6 15V
73V

IC1201

Pin Vol t ag e

15V
20V
3 1,27V
4 3,3V
50V
65V

IC801

Pin Vol tage

1 187V
3 0,5V
4 22,5V
5 0,1V
6 1,3V
7 0,5V

IC2301

Pin Vol tage

1 11,5V
25V
30V
45V
5 2,8V
6 1,5V
70V
80V
9 0,5V

IC851

Pin Vol tage

1 10,7V
2 10,7V
3 3,3V
40V
5 3,1V
68V
75V

IC802

Pin Vol tage

1 141V
29V
30V

Pin Vol tage

All voltage measurements were made in POWER ON mode, with 127V 60Hz power
source and Color Bars Video Pattern.

IC880

1 10,4V
25V
30V

- 6 -

IC601 - BLOCK DIAGRAM

TC-14RM10LP/ TC-20RM10LP/ TC-20RA10LP

+3.3 V

PWMS(4X)

I/O PORTS (4x)

ADC IN (4x)
VST OUT

SDASCL

LED OUT (2x)

VPE

RESET

AUDOUT
AUDIO3
AUDIO2

1/10 PAGE

MEMORY

C-BUS

2

I

TRANSCEIVER

VST PWM-DAC

80C51 CPU

ENHANCED

I/O PORTS

DISPLAY

TELETEXT/OSD

V

H

TELETEXT

ACQUISITION

CVBS

ROM/RAM

ROGOBO

BL

B

RG

CONTR/BRIGHTN

OSD/TEXT INSERT

COR

SYNC

DELAY LINE

BASE-BAND

BLKIN

BCLIN

GB

CCC

R

WHITE-P. ADJ.

BLUE STRETCH

TINT CONTROL

SATURATION

BLACK STRETCH

RGB/YUV INSERT

WHITE STRETCH

Y

U

V

EW GEOMETRY

V-DRIVE +

GEOMETRY

V

G/Y B/U BL

R/V

(EWD)

EHTO

VMOUT

HOUT V-DRIVE

(AVL)

(SNDIF)

AUDEEM
QSSO/AMOUT

AVL

SOUND PLL

DEEMPHASIS

AUDIO SWITCH

VOLUME CONTROL

AGC

QSS MIXER

QSS SOUND IF

AM DEMODULTOR

SIFIN

LUMA DELAY

REF

VISION IF

PLL DEMOD.

VIFIN

TUNERAGC

PEAKING

VMOUT

AGC/AFC

VIDEO AMP.

- 7 -

PAL/SECAM/NTSC

REF

VIDEO SWITCH

IFVO

TRAP

SOUND

DECODER

VIDEO IDENT.

VIDEO FILTERS

CVBS3/Y

CVBS2

C

CVBSO

Y

LOOP

nd

H-DRIVE

H-SHIFT

2

H

H-OSC. + PLL

H/V SYNC SEP.

+8V

TC-14RM10LP/ TC-20RM10LP/ TC-20RA10LP

GP31 CHASSIS FEATURE SUMMARY

CHASSIS : GP31
MODEL : TC-14RM10LP, TC-20RM10LP and TC-20RA10LP
SYSTEM : (P AL-M/P AL-N/NTSC) (PAL-M 50Hz)
POWER SOURCE : AC automatic power switching 127/220V, 50/60Hz
MEMORY : 125 positions
TV TUNING RANGE : 181 channels (TV / CATV)
OSD LANGUAGE : Sp anish , Portuguese and English
AUDIO SYSTEM : Mono
VERTICAL MAGNETIC FELD : -0.15 ±0.03 (P ANALAT)
COLOR TEMPERATURE : (High Light) x= 0.275 ± 0.01, y=0.284 ± 0.01, Y=150 (nit))

(Low Light) x= 0.273 ± 0.01, y=0.283 ± 0.01, Y=7.0 (nit)

REFERENCE VOLTAGE

CONTENTS REFERENCE TEST POINT

+B VOLTAGE

Sound confirmation

PAL color output

NTSC color output

Anode (EHT) voltage

Memory Data

002

007

009

010

008

[A]=C0H, [B]=00H, [C]=00H, [D]=B3H, [E]=04H, [F]=04H, [G]=00H, [H]=01H

Between A22-1 and A22-3

TPA10

TPA8

TPA9

TPA21

or A22-2 and A22-4

TPL2

TPL1

TPL1

CRT

ANODE

POINTS

D

C

C

SPECIFICATIONS

140 ± 1,5V

8 ±1V

5 ±1V

175 ±1V

0.5 Vp-p

2.25 ±0.1Vo-p

2.25 ±0.5Vo-p

2.5 ±0.5Vo-p

TC-14RM10LP

24.5 +0.7 (kV)

24.5 -1.5 (kV)

TC-20RM10LP

TC-20RA10LP

26.5 +0.7 (kV)

26.5 -1.5 (kV)

- 8 -

TC-14RM10LP/ TC-20RM10LP/ TC-20RA10LP

DAC CONTROL FOR GP31 CHASSIS FUNCTIONS AND ADJUSTMENTS

HOW TO RESET THE UNIT (SELF CHECK)

To reset the unit, press simultaneously “VOLUME (–)” on the front panel and “TIMER” on the remote control.

HOW TO ENTER IN THE SERVICE MODE:

1. Adjust “OFF TIMER” to 30 minutes.
Press simultaneously “VOLUME (–)” on the front panel and “RECALL” on the remote control to enter “SERVICE

MODE”.
After a couple of seconds, the expression “CHK1” should appear on the right superior side of the TV screen.

2. To change to memory data, press ”MUTE” and ”VOLUME(_)” simultaneously while the OSD is still on CHK1 mode.

3. Press key “2” to move forward and “8” to move backward each page (8h positions) in the memory .

Exemple: Memory position is
will go to position 108 .

4. Press “4” and “6” to move to right or left.

5. Press “CH(+)” e “CH(–)” to move for blocks.

Example: Initial memory position is 000. By pressing “CH(+)” cursor will go to position 100, pressing it once again the
cursor will go to position 200. The key “CH(–)” does the inverse move.

6. To change values in the memory , press “VOLUME(+)” to increase and ”VOLUME(_)” to decrease.

100. A fter pressing “2” the cursor will go to position 0F8 and after pressing “8” the cursor

7. After data adjustment, OSD will change to RED color . Press “0” to memorize the adjustment and the OSD will change to
GREEN color.

NOTE:

To alter from CHK1 mode to CHK2, CHK3 or CHK4 mode, press key “2” to move forward and key “1” to move back, as
ilustrad below.

NORMAL MODE SERVICE MODE

“2”

Turn Off

OPTION CODE

CHK1

SETTING

ADJUSTMENT

1

”

“

VCJ

CHK1 MODE - OPTIONS

On CHK1 mode it is possible to adjust the items of the table shown here.

Note:

T o select an option, type “4” to move forward and “3” to move back.
After having selected the desired option, adjust it by pressing the “VOL(_)” or “VOL(+)”
keys.
Press “0” to memorize the adjustment.

Observation:

V alues of CHK1 table in should be programed, exactly as described in the t able
shown here.

“2”“

CHK2 CHK3 CHK4

PINCUSHION

ADJUSTMENT

1

”“

“

2

”

WHITE BALANCE

ADJUSTMENT

1

”

CHK1 MODE TABLE

Standard values

OPTION1
OPTION2
OPTION3
OPTION4
OPTION5
OPTION6
OPTION7
OPTION8

For TC-20RA10LP only

OPTION4

C0
00
00
B3
04
04
00
01

33

- 9 -

TC-14RM10LP/ TC-20RM10LP/ TC-20RA10LP

ADJUSTMENTS

CHK2 MODE - VCJ ADJUSTMENTS

On CHK2 mode it is possible to adjust the items of the table shown here.

Note:

To select an item, type “4” to move forward and “3” to move back.
After having selected the desired option, adjust it by pressing the “VOL(_)” or
“VOL(+)” keys. The OSD color will change for red.

CHK3 MODE - PINCUSHION ADJUSTMENTS

On CHK3 mode it is possible to adjust the items of the table shown here.

Note:

To select an item, type “4” to move forward and “3” to move back.
After having selected the desired option, adjust it by pressing the “VOL(_)” or
“VOL(+)” keys. The OSD color will change for red.

CHK4 MODE - WHITE BALANCE ADJUSTMENTS

On CHK4 mode it is possible to adjust the items of the table shown here.

Note:

To select an item, type “4” to move forward and “3” to move back.
After having selected the desired option, adjust it by pressing the “VOL(_)” or
“VOL(+)” keys. The OSD color will change for red.

CHK2 MODE T ABLE

Standard values

RF AGC
CONTRAST
COLOUR
SUB COLOUR
TINT
SUB NTSC-TINT
BRIGHT

CHK3 MODE TABLE

Standard values

V-SLOPE
V-SHIFT
V-AMP
H-SHIFT

CHK4 MODE T ABLE

Standard values

R-CUT
G-CUT
BRIGHT
SUB-BRIGHT
CONTRAST
SUB- CONTRAST
R-DRIVE
G-DRIVE
B-DRIVE
RGB-CONTRAST

23

100

50
28
50
28
50

32
37
43
45

28
30
50
30

100

11
33
31
35

2

Observation:

The values of the tables CHK2, CHK3 and CHK4 are average values and they can vary, the values described here are
reference values.

TO EXIT SERVICE MODE AND RETURN TO NORMAL MODE

To exit SERVICE MODE, turn off or reset (SELF CHECK) the television.

TEST AND MEASUREMENT EQUIPMENTS

T o execute all these electrical adjustments, the following equipment are required:

• Dual-Trace Oscilloscope
V oltage Range: 0.001 V to 50 V/Div.
Frequency Range: DC to 50 MHz
Probes: 10:1, 1:1

• NTSC Video Pattern Generator

• DVM (Digital Volt Meter)

• MTS/SAP Signal Generator

• (TV Multi-Channel Sound Modulator (U.S.A.))

• Plastic Tip Driver and Non-Metal Driver

• Isolation Transformer (V ariable)

• Degaussing Coil

• White Pattern Generator

• Audio Generator

- 10 -