Toshiba TW40F80 User Manual
NTDPJTV05
TECHNICAL TRAINING MANUAL
N5SS CHASSIS
PROJECTION TELEVISION
TW40F80
Only the different points from the training manual “N5SS chassis” with its file
No. 026-9506 are described on this manual.
For other parts common with “N5SS chassis”, please refer to the original manual
with its file No. 026-9506.
©1997 TOSHIBA AMERICA CONSUMER PRODUCTS, INC.
NATIONAL SERVICE DIVISION
TRAINING DEPARTMENT
1420-B TOSHIBA DRIVE
LEBANON, TENNESSEE 37087
PHONE: (615)449-2360
FAX: (615)444-7520
www.toshiba.com/tacp
Contents Page 1
Contents
SECTION I: OUTLINE................................................................................................6
1. FEATURE....................................................................................................................6
2. MERITS OF BUS SYSTEM...................................................................................... 6
3. SPECIFICATIONS..................................................................................................... 7
4. FRONT VIEW ...........................................................................................................8
5. REAR VIEW...............................................................................................................9
6. REMOTE CONTROL VIEW..................................................................................10
7. CHASSIS LAYOUT.................................................................................................. 11
8. CONSTRUCTION OF CHASSIS........................................................................... 12
SECTION II: TUNER, IF/MTS/S. PRO MODULE ................................................ 13
1. CIRCUIT BLOCK ...................................................................................................13
2. POP TUNER .............................................................................................................17
SECTION III: CHANNEL SELECTION CIRCUIT ............................................... 18
1. OUTLINE OF CHANNEL SELECTION CIRCUIT SYSTEM ..........................18
2. OPERATION OF CHANNEL SELECTION CIRCUIT ...................................... 18
3. MICROCOMPUTER............................................................................................... 19
4. MICROCOMPUTER TERMINAL FUNCTION..................................................20
5. EEPROM (QA02) .....................................................................................................22
6. ON SCREEN FUNCTION....................................................................................... 22
7. SYSTEM BLOCK DIAGRAM................................................................................23
8. LOCAL KEY DETECTION METHOD ................................................................24
9. REMOTE CONTROL CODE ASSIGNMENT ..................................................... 25
10. ENTERING TO SERVICE MODE ...................................................................... 28
11. TEST SIGNAL SELECTION ............................................................................... 28
12. SERVICE ADJUSTMENT .................................................................................... 28
13. FAILURE DIAGNOSIS PROCEDURE ............................................................... 29
14. TROUBLESHOOTING CHART .......................................................................... 32
SECTION IV: DVD SWITCH CIRCUIT .................................................................35
1. DVD SWITCH BLOCK DIAGRAM ......................................................................35
2. OUTLINE..................................................................................................................36
Contents Page 2
SECTION V: WAC CIRCUIT .................................................................................... 37
1. OUTLINE..................................................................................................................37
2. CIRCUIT OPERATION ..........................................................................................37
3. BLOCK DIAGRAM ................................................................................................. 42
4. WIDE ASPECT CONVERSION CIRCUIT FAILURE ANALYSIS
PROCEDURES......................................................................................................... 43
SECTION VI: DUAL CIRCUIT ................................................................................ 45
1. OUTLINE..................................................................................................................45
2. PRINCIPLES OF OPERATION............................................................................. 45
3. SYSTEM COMPONENT DIAGRAM OF DUAL UNIT...................................... 46
4. CIRCUIT OPERATION ..........................................................................................47
5. TERMINAL FUNCTION, DESCRIPTION AND BLOCK DIAGRAM OF
MAIN IC.................................................................................................................... 51
SECTION VII: 3-DIMENSION Y/C SEPARATOR CIRCUIT .............................. 58
1. OUTLINE..................................................................................................................58
2. CIRCUIT DESCRIPTION ...................................................................................... 58
SECTION VIII: VER TICAL OUTPUT CIRCUIT.................................................. 60
1. OUTLINE..................................................................................................................60
2. V OUTPUT CIRCUIT.............................................................................................. 61
3. PROTECTION CIRCUIT FOR V DEFLECTION STOP ................................... 64
4. RASTER POSITION SWITCHING CIRCUIT ....................................................66
SECTION IX: HORIZONTAL DEFLECTION CIRCUIT .................................... 67
1. OUTLINE..................................................................................................................67
2. HORIZONTAL DRIVE CIRCUIT.........................................................................67
3. BASIC OPERATION OF HORIZONTAL DRIVE...............................................67
4. HORIZONTAL OUTPUT CIRCUIT .....................................................................69
5. HIGH VOLTAGE GENERATION CIRCUIT ....................................................... 76
6. HIGH VOLTAGE CIRCUIT ................................................................................... 78
7. X-RAY PROTECTION CIRCUIT.......................................................................... 80
8. OVER CURRENT PROTECTION CIRCUIT ......................................................81
Contents Page 3
SECTION X: DEFLECTION DISTORTION CORRECTION CIRCUIT
(SIDE DPC CIRCUIT)............................................................................................... 82
1. DEFLECTION DISTORTION CORRECTION IC (TA8859CP) ....................... 82
2. DIODE MODULATOR CIRCUIT ......................................................................... 83
3. A CTUAL CIRCUIT.................................................................................................. 84
SECTION XI: DIGITAL CONVERGENCE CIRCUIT ......................................... 87
1. OUTLINE..................................................................................................................87
2. CIRCUIT DESCRIPTION ...................................................................................... 87
3. PICTURE ADJUSTMENT ...................................................................................... 89
4. CASE STUDY ...........................................................................................................97
5. TROUBLESHOOTING ........................................................................................... 98
6. CONVERGENCE OUTPUT CIRCUIT................................................................. 99
7. CONVERGENCE TROUBLESHOOTING CHART .........................................101
OVERALL BLOCK DIAGRAM................................................................................102
SECTION I: OUTLINE
1. FEATURE
The TW40F80 is a first PJ-TV with a wide screen aspect
ratio of 16:9 we introduce to North U.S.A. markets.
As the basic chassis N5SS chassis is used.
The future of the model TW40F80 is the use of the N5SS
chassis. This chassis introduces a new bus system, developed by the PHILIPS company, called the I2C (or IIC) bus.
IIC stands for Inter-Integrated Circuit control. This bus coordinates the transfer of data and control between ICs inside
the TV. It is a bi-directional serial bus consisting of two lines,
named SDA (Serial D ATA), and SCL (Serial CLOCK). This
bus control system is made possible through the use of digital-to analog converters built into the ICs, allowing them to
be addressed and controlled by strings of digital instructions.
The TW40F80 is a first wide TV with a double window system we introduce to North U.S.A. markets.
The size of the main and sub screens separated in left and
right on the screen is the same as each other. So it is possible
to enjoy two programs or video and TV program at the same
time.
The sub screen is equipped wit 9 screen search function and
this is very convenient convenient to search a program you
desire.
2. MERITS OF BUS SYSTEM
2-1. Improved Serviceability
Most of the adjustments previously made by resetting variable resistors and/or capacitors can be made on the new chassis by operating the remote control and seeing the results on
the TV screen. This allows seeing adjustments to be made
without removing servicing speed and efficiency.
2-2. Reduction of Parts Count
The use of digital-to-analog converters built into the ICs,
allowing them to be controlled by software, has eliminated
or reduced the requirement for many discrete parts such as
potentiometers and trimmers, etc.
2-3. Quality Control
This central control of the adjustment data makes it easier to
understand, analyze, and review the data, thus improving
quality of the product.
Note:
Only the different points from the manual
“N5SS Chassis” with its file No. 026-9506
are described on this manual. For other parts
common with “N5SS Chassis”, please refer
to the original manual with its File No. 026-
9506.
***
5
3. SPECIFICATIONS
Model TW56F80TW40F80 TP61F90 TP61F80 TP55F80 TP55F81 TP50F90 TP50F60 TP50F61 TP50F50 TP50F51
CRT 7" 7" 7" 7" 7" 7" 7" 7" 7" 7" 7"
CRT Source Hitach Hitach Hitach Hitach Hitach Hitach Hitach Hitach Hitach Hitach Hitach
Remote H/U Intell Univ Intell Univ Univ Univ Intell Univ Univ. A-Univ A-Univ
RMT Keys 52 key 36 key 52 key 36 key 36 key 36 key 52 key 36 key 36 key 42 key 42 key
GENERALSOUNDPICTURE
PIP 2-TN 2-TN 2-TN 2-TN 2-TN 2-TN 2-TN 2-TN 2-TN 1-TN 1-TN
Dolby Surr ProLgc ProLgc Dy-Sur Dy-Sur Dy-Sur ProLgc
Surround Dsp4Ch ● Dsp4Ch Dsp4Ch Dsp4Ch Dsp4Ch Dsp4Ch ●●●●
SAP ●●●●●●●●●●●
Cyclone
SBS ●●●●●●●●●●●
Audio (W) 28W 28W 28W 28W 28W 28W 28W 28W 28W 28W 28W
Center +20W 20W 20W
Rear +20W 20W 20W 20W 20W 20W
Comb-Filter 3D-Y/C 3D-Y/C 3D-Y/C 3D-Y/C DIG DIG DIG DIG DIG DIG DIG
DQF ●●●●
Scan-Modul ●●●●●●●●●●●
VCC ●●
Black-Expan ●●●●●●●●●●●
Color-D.E ●●●●●●●●●●●
Pic-Prefer ●●●●●●●●●●●
Color-Temp ●●●●●●●●●●●
Flesh-Tone ●●●●●●●●●●●
Nois-Reduce ●●●●●●●●●●●
Hori-Resolu 800 800 800 800 800 800 800 800 800 800 800
C-Chassis
Fav-Channel ●●●●●●●●●●●
Ch-Label ●●●●●●●●●●●
3-Language ●●●●●●●●●●●
Clock ●●●●●●●●●●●
Ch-Lock/Off ●●●●●●●●●●●
C.Caption ●●●●●●●●●●●
OTHERS
EDS ● ●●● ●●●●
New-OSD ●●●●●●●●●
S/Sight ●● ●
S-Video In 1+1 1+1 1+1 1+1 1+1 1+1 1+1 1+1 1+1 1 1
AV-In/Out 1+2/1 1+2/1 1+2/1 1+2/1 1+2/1 1+2/1 1+2/1 1+2/1 1+2/1 2/1 2/1
Front-Term ●●●●●●●●●
A(Var)-Out ●●●●●●●●●●●
2RF-Term ●●●●●●●●●
SPK-Term ●●●●●●●●●●●
TERMINALACCE
PIP Audio ●●
C-Ch-Input ●●●
E/Jack
S/S-Jack ●● ●
IR-B & 75W ●● ●
Adapter ●●●●●●●●●●●
Rod-Antenna
SPK-Box ●●● ●
EZ RMT ●● ●
Cabinet TW56D90 40W30E TP61E90 TP61E80 TP55E80 TP55E81 New New New New New
*
6
4. FRONT VIEW
POWER indicator
POWER
POWER button
Press to open
the door.
Behind the door
S-VIDEO VIDEO
IN-VIDEO 3
VIDEO 3 INPUTS DEMO button
AUDIO
L/MCNO R
Note: [No] Owner's manual page.
DEMO
MENU
MENU button
Fig. 1-1
ANT / VIDEO button **
ENTER button
ANT/
VIDEO
ENTER
VOLUME / buttons
/ buttons
VOLUME CHANNEL
CHANNEL / buttons
/ buttons
7
5. REAR VIEW
T
TV front
Fig. 1-2
Behind the door
S-VIDEO VIDEO
L/MCNO R
IN-VIDEO 3
VIDEO / AUDIO INPUT jacks (VIDEO 3)
S-VIDEO INPUT jack (VIDEO 3)
AUDIO
TV rear
(+)
(Ð)
EXT SPEAKER
EXT INT
MAIN SPEAKER
EXTERNAL
SPEAKER
terminal
ANT (75 ½)
(+)
(Ð)
MAIN
SPEAKER
switch
S-VIDEO INPUT jack
(VIDEO 1)
VARIABLE AUDIO
OUTPUT jacks
S-VIDEO
TV
AMP
VIDEO
L
VIDEO
AUDIO
R
VIDEO/AUDIO
VIDEO1
VIDEO2 DVD
N CUT
VIDEO / AUDIO
INPUT jacks
(VIDEO 1)
VIDEO / AUDIO
INPUT jacks
(VIDEO 2)
AMP
VAR
R
L
ACC
Y
C4
VIDEO
L
AUDIO
R
DVD INPUT
AMP
R
VIDEO /
AUDIO
OUTPU
jacks
jacks
Fig. 1-3
8
6. REMOTE CONTROL VIEW
Aim at the remote sensor on the TV
TIMER* [ 38, 39 ]
TV / CABLE / VCR switch [ 15 ]
Set to " TV " to control the TV.
TV / VIDEO* [ 55 ]
Channel Number* [ 25 ]
EDS* [ 27 ]
ENTER [ 19 ]
FAN * [ 46 ]
POP CH * [ 40 ]
RESET * [ 33 ]
PIC -SIZE
TV
CABLE
VCR
1
4
7
100
EDS MENU
FAV FAV
STOP SCURCE PLAY POP
REC
RECALL
TV/VIDEO
MUTE
2
3
5
6
8
9
CH RTN
0
ENT
ADV/
POP CH
ENTER
ADV/
POP CH
TV/VCR REW FF
POWER
CH
VOL
¥
EXITRESET
RECALL* [ 26 ]
POWER [ 20 ]
MUTE* [ 26 ]
CHANNEL / [ 25 ]
CH RTN* [ 26 ]
VOLUME / [ 25 ]
MENU [ 18 ]
POP CH * [ 40 ]
///[ 18 ]
FAN * [ 46 ]
EXIT * [ ON ]
Owner's Manual page
(For " TV " and " CABLE " positions)
POP functions* [40]
Note: [No] Owner's Manual page.
CH SEARCH
STILL SWAP
TOSHIBA
* These function do not have
duplicate locations on the TV.
They can be controlled only by
the Remote Control.
Fig. 1-4
9
7. CHASSIS LAYOUT
330
242
6pcs
CHIP SINGLE FACED
:AUDIO LIVE
14
(chip)
242
: DIGITAL
10
139
242
2pcs
CONVER
CHIP DOUBLE FACED
160
:SIARSIGHT
15
:DUAL
11
1pcs
2pcs
CHIP DOUBLE FACED
126
CHIP DOUBLE FACED
139
: STARSIGHT
15
- 1: NEW OSD
2pcs
242
:DOLBY PRO
16
TW56F80 ONLY
CHIP DOUBLE FACED
:WAC
13
7
113
: AUTOLIVE
: MAIN
1
242
:3D Y/C
12
2pcs
CHIP DOUBLE FACED
155
189
4pcs
:MAC
13
FACED
CHIP DOUBLE
139
14
- 6
: DUAL
11
YCS
12
16
SURR
FRO.
-2:
PRO
DOLBY
7
- 1 : A/V
4
- 2 : SPEAKER
4
STARSIGHT
N.OSD
FDS
3DYC
COHB
F.SUR
DSP
DOLBY
2
TUNER
3DYC
4CH
PRO
2
PC BOARD
249
249
330
2pcs
-1: NEW OSD7-2: FRONT SURROUND
: NEW OSD/
FRONT SURROUND
7
7
165
1pcs
-1: A.V4-2: SPEAKER
: AV.EXT SPK
4
4
165
1pc
: MAIN
1
294
- 4 : FRONT-LED
5
TW56F80 ONLY
249
330
330
: SW DVD
8
CRT-1pcs
:
5
4pcs
165
-5: FRONT CON5-6: SVH
5
ÐD( R )
ÐD( G )
ÐD( B )
D/FRONT/SHV
-1: CRT
-2: CRT
-3: CRT
-4: FRONT LED
5
5
5
5
249
1pc
: DEFELECTION
2
294
- 5 : FRONT-CON
5
249
: POWER S.S
9
249
: POWER 1
6
330
: CONV / POWER2
3
FOCUS PACK
- 6 : SVM
5
2pcs
TW56F80 ONLY
249
: DEFLECTION
2
REAR ANP
(TW56F80 ONLY)
1pc
: SW DVD
8
CENTER AMP
(TW56F80 ONLY)
To CRT
4
- 3 : DPC
J-BOX
Fig. 1-5
F.B.T
165
1pc
: CONVERTER/POWER 2
PACK
To FOCUS
: POWER 1
6
3
294
CRT-D(B)
:
-3
5
: DIGITAL
CONVER
10
CRT-D(G)
:
-2
5
(TW56F80 ONLY)
POWER STARSIGHT
9
CRT-D(R)
:
-1
5
MODE1
TW40F80
TW56F80
10
8. CONSTRUCTION OF CHASSIS
A
4
502
PMM 4x16
pcs
A512
BIDT2
4x12 6pcs
A902
A110B
2pcs
K601
BRT TBS 4x16
A201
A520
PP 5x18
4pcs
A521
2pcs
Z410
A110A
A110
A101
A505
BIDT2
4x12 2pcs
A517
PBI 4X16
8pcs
A126
B202
A351
A127
A401
A353
A522
BIDT2
4X12 18pcs
A128
A517
A205
A516
PMS 3.8x28
3pcs
A202
A511
PP4x14
4pcs
A510
BRBTB
5x16
4pcs
PMM 4x16
2pcs
A506
BRB TBS
4x16 4pcs
A515
PMM 4X16
4pcs
A102
K103
V901R
V902G
V903B
A501
BTA 4x16 16pcs
W661~
W664
A106
A508
BIDT2
4x12 2pcs
A523
PMM 4x16
2pcs
A509
BTA 4x16 4pcs
L462~
L464
L472~
L474
A503
PMM
4x16
8pcs
A105
A107
A104
A105
A104
K511
A519
BIDT2
4x12
5pcs
A508
BIDT2
4x12
4pcs
A513
BIDT2
4x12
Fig. 1-6
11
A108
SECTION II: TUNER, IF/MTS/S. PRO MODULE
1. CIRCUIT BLOCK
IF/MTS/S.PRO Module MVUS34S
EL466L
Tuner
RF AGC
1-1. Outline
(1) RF signals sent from an antenna are converted into in-
termediate frequency band signals (video: 45.75 MHz,
audio: 41.25 MHz) in the tuner. (Hereafter, these signals are called IF signals.)
(2) The IF signals are band-limited in passing through a
SAW filter.
(3) The IF signals band-limited are detected in the VIF
circuit to develop video and AFT signals.
(4) The band-limited IF signals are detected in the SIF cir-
cuit and the detected output is demodulated by the audio multiplexer, developing R and L channel outputs.
These outputs are fed to the A/V switch circuit.
(5) A sound processor (S.PRO.) is provided.
SAW
Filter
AFT output
Fig. 2-1 Block diagram
VIF/SIF
Circuit
TP12
Video output
SIF
output
To A/V switch circuit
Sound
Multiplex
Circuit
TV
R-OUTTVL-OUT
C-IN
S.PRO Circuit
R-IN L-IN
R-OUT
L-OUT
C-OUT
(L+R)
-OUT
(5) VIF/SIF circuit uses PLL sync detection system to
improve performances shown below:
• Telop buzz in video over modulation
• DP, DG characteristics (video high-fidelity reproduction)
• Cross color characteristic (coloring phenomenon
at color less high frequency signal objects)
(6) HIC SBX1637A-22 is used in the audio multiplexer
circuit to minimize the size with increased performance.
(7) As a sound control processor, TA1217N is used. I2C-
bus data control the DAC inside the IC to perform
switching of the audio multiplexer modes.
1-2. Major Features
(1) The VIF/SIF circuit is fabricated into a small module
by using chip parts considerably.
(2) As the tuner, EL466L that which contains an inte grated
PLL circuit is employed.
(3) Wide band double SAW filter F1802R used.
(4) FS (frequency synthesizer) type channel selection sys-
tem employed.
12
1-3. Audio Multiplex Demodulation Circuit
The sound multiplex composite signal FM-detected in the
PIF circuit enters pin 12 of HIC (hybrid IC) in passing
through the separation adjustment VR RV2 and amplified.
After the amplification, the signal is split into two: one enters a de-emphasis circuit, and only the main signal with the
L-R signal and a SAP signal removed enters the matrix circuit. At the same time, the other passes through various filters and trap circuits, and the L-R signal is AM-demodulated, and the SAP is FM-demodulated.
MVUS34S
Then, both are fed to the matrix circuit. At the same time,
each of the stereo pilot signal fH and the SAP pilot signal
5fH is also demodulated to obtain an identification volta ge.
With the identification voltage thus obtained and the user
control voltage are used to control the matrix.
The audio signals obtained by demodulating the sound multiplex signal develop at pin 10 and 11 of HIC and develop
the terminals of 12 and 14 of the module.
MPX
Out
9
Monitor the input
pin for multiplex
sound IC
Table 2-1 Matrix for broadcasting conditions and
reception mode
Broad- Switching
casted mode
Stereo STE R L
SAP R L
MONO L+R L+R
Mono STE L+R L+R – –
SAP L+R L+R – –
MONO L+R L+R – –
Stereo STE R L
+ SAP SAP SAP
SAP MONO L+R L+R
Mono STE L+R L+R –
+ SAP SAP SAP –
SAP MONO L+R L+R –
Output OSD display
12 pin 14 pin
(R) (L)
10
Stereo 0V
Other 5V
Fig. 2-2 Block diagram of MVUS34S
Stereo SAP
•
•
•
••
••
••
11
SAP 0V
Other 5V
–
–
–
•
•
•
TV
R-Out
TV waveform detection
output (R)
: Available, – : Not available
•
DAC-out1
(SURR ON/OFF)
12 13 14
OFF 0V
ON 9V
To AV select circuit
Note:
Of the mode selection voltages, switching voltages for STE,
SAP, MONO do not output outside the module.
They are used inside the module to control the BUS.
TV
L-Out
TV waveform detection
output (L)
DAC-out2
(RFSW)
15
RF1 0V
RF2 9V
13
1-4. A.PRO Section (Audio Processor)
The S.PRO section has following functions.
(1) Woofer processing (L+R output)
(2) High band, low band, balance control
(3) Sound volume control, cyclone level control
(4) Cyclone ON/OFF
TA1217N
All these processing are carried out according to the BUS
signals sent from a microcomputer.
Fig. 2-3 shows a block diagram of the A.PRO IC.
Lin
Rin
Cin
Win
SDA
SCL
56
36
I C
Center
LEVEL
Woofer
LEVEL
2
7
31 24
D/A
CONV
VOLUME
23
30 9
BALANCE
22 19
I/O
28
8
L out
26
R out
25
C out
18
W out
10
17
16
15
14
13
12
11
SAP Ident.
STE Ident.
1272922 32
34
30
2
3
20
21
TONE CONTROL
LPF
4
R-in C-in L-in
From From From
A/V Dolby A/V
SCL SDA W-out O-out L-out
to Q670 to Q640 to Q670 to Q670
Via QS101
Fig. 2-3 A.PRO block diagram
14
Configuration of the audio circuit and signal flow are given
in Fig. 2-4
A/V PCB
VIF+MTS+S.PRO
MODULE
R
L
12
EQ
14
ER
ICV01
R
6
MOTHER
TV
L
7
CHILD
29
L
R
31
TV
FOR POP
IF MODULE
AUDIO
VIDEO 1
VIDEO 2
OR
DVD
VIDEO 3
(FRONT INPUT)
R L
R L
R L
2
L
L
11
VIDEO 1
13
R
3
L
VIDEO 2
9
R
L
15
VIDEO 3
17
R
PIP
OUTPUT
VARIABLE
AUDIO OUTPUT
TERMINAL
1
R
VIDEO
OUTPUT
TERMINAL
35
R
37
L
L
R
AS
AR
AI
AJ
L
PIP OUT
(AUDIO)
R
FRONT
SURROUND
UNIT
(TW40F80 NOT USE)
VIF+MTS+A.PRO
MODULE
R OUT
16
R
W OUT
18
L
L OUT
Q601
25
22
24
R
2511
+
L
+
7
R
L
Fig. 2-4
15
2. POP TUNER
Label
Name
Lot No.
1
15
TUNER
SECTION
RF AGC
SAW
FILTER
AFT
OUTPUT
VIF/SIF
CIRCUIT
VIDEO
OUTPUT
AUDIO
OUTPUT
Fig. 2-5
2-1. Outline
The POP tuner (EL922L) consists of a tuner and an IF block
integrated into one unit. The tuner receives RF signals induced on an antenna and develops an AFT output, video
output, and audio output.
The tuner has receive channels of 181 as in the tuner for the
main screen and it is also controlled through the I2C-bus.
As the IC for the IF, a PLL complete sync detection plus
audio inter carrier system are employed.
Terminal No. Name
1NC
2 32V
3 S-CLOCK
4 S-DATA
5NC
6 ADDRESS
75V
8 RF AGC
99V
10 AUDIO
11 GND
12 AFT
13 NC
14 GND
15 VIDEO
Fig. 2-6 Tuner terminal layout
16
SECTION III: CHANNEL SELECTION CIRCUIT
1. OUTLINE OF CHANNEL SELECTION CIRCUIT SYSTEM
The channel selection circuit in the N5SS chassis employs
a bus system which performs a central control by connecting a channel selection microcomputer to a control IC in
each circuit block through control lines called a bus. In the
bus system which controls each IC, the I2C bus system (two
line bus system) developed by Philips Co. Ltd. in the Netherlands has been employed.
The ICs controlled by the I2C bus system are: IC for V/C/D
signal processing (Q501), IC for A/V switching (QV01), IC f or
non volatile memory (QA02), Main and sub U/V tuners (H001,
HY01), IC for deflection distortion correction (Q302), IC for
POP and Double Window signal pr ocessing (QY03), IC for
closed caption control (QM01), IC for WAC control (QX01),
IC for 3D-YCS (QZ01), IC for AUTOLIVE (QK06).
Differences from N5SS chassis are as follows;
1. On-screen function inside microcomputer is used. Separate IC is not used for on-screen.
2. The microcomputer does not have the closed caption
function, but controls separate IC for closed caption.
3. The system uses two channels of I2C bus. One is only
for non-volatile memory.
2. OPERATION OF CHANNEL SELECTION CIRCUIT
T oshiba made 8 bit microcomputer TLCS-870 series for TV
receiver, TMP87CS38N-3320 is employed for QA01.
With this microcomputer, each IC and circuit shown below
are controlled.
(1) CONTROL OF VIDEO/CHROMA/DEF SIGNAL
PROCESS IC (Q501 Toshiba TA1222AN)
• Adjustments for uni-color, brightness, tint, color
gain, sharpness and PIP uni-color
• Setting of adjustment memory values for subbrightness, sub-color and sub-tint, etc.
• Setting of memory values for video parameters such
as white balance (RGB cutoff, GB drive) and
gcorrection, etc.
• Setting of video parameters of video modes (Standard, Movie, Memory)
(2) CONTROL OF A/V SWITCH IC (QV01 Toshiba
TA1218N)
• Performs source switching for main screen and sub
screen
• Performs source switching for TV and three video
inputs
(3) CONTROL OF NON-VOLATILE MEMORY IC
(QA02 Microchip 24LC08BI/P)
• Memorizes data for video and audio signal adjustment values, volume and woofer adjustment values, external input status, etc.
• Memorizes adjustment data for white balance (RGB
cutoff, GB drive), sub-brightness, sub color, sub
tint, etc.
• Memorizes deflection distortion correction value
data adjusted for each unit.
(4) CONTROL OF U/V TUNER UNIT (H001 Toshiba
ELA12L, HY01 Toshiba EL922L)
• A desired channel can be tuned by transferring a
channel selection frequency data (divided ratio data)
to the I2C bus type frequency synthesizer equipped
in the tuner, and by setting a band switch data which
selects the UHF or VHF band.
(5) CONTROL OF DEFLECTION DISTORTION COR-
RECTION IC (Q302 Toshiba TA8859P)
• Sets adjustment memory value for vertical amplitude, linearity, horizontal amplitude, parabola, corner, trapezoid distortion.
(6) CONTROL OF POP & Double W indow SIGN AL PRO-
CESS IC (QY03 Toshiba TC9092AF, QY91 Sony
CXP85116B-514Q)
• Controls ON/OFF and 9 pictures serch of POP.
(7) CONTROL OF CLOSED CAPTION/EDS (QM01
Motorola XC144144P)
• Controls Closed Caption/EDS.
(8) CONTROL OF WAC (QX01 Toshiba TC9097F)
• Controls Wide Aspect.
(9) CONTROL OF 3D-YCS (QZ01 Toshiba TC9086F)
• Controls ON/OFF of 3 Dimension Y/C separator.
(10) CONTROL OF VERTICAL AMPLITUDE (QK06
Toshiba TMP87CM36N)
• Controls Wide Mode.
(11) CONTROL OF OSD (Do not I2C BUS) (QR60 Fujitsu
MB90091)
• Controls of OSD Menu.
17
3. MICROCOMPUTER
Microcomputer TMP87CS38N-3320 has 60k byte of ROM
capacity and equipped with OSD function inside.
The specification is as follow.
• Type name : TMP87CS38N-3320
• ROM : 60k byte
• RAM : 2k byte
• Processing speed : 0.5m s (at 8MHz with Shortest command)
• Package : 42 pin shrink DIP
•I2C-BUS : two channels
• PWM : 14 bit x 1, 7 bit x 9
• ADC : 8 bit x 6 (Successive comparison system, Conver sion time 20ms)
IIC device controls through I2C bus. (Timing chart : See Fig.
3-1)
• LED uses big current port for output only.
• For clock oscillation, 8MHz ceramic oscillator is used.
•I2C has two channels. One is for EPROM only.
• Self diagnosis function which utilizes ACK function of
I2C is equipped
• Function indication is added to service mode.
• Remote control operation is equipped, and the control
by set no touch is possible. (Bus connector in the conventional bus chassis is deleted.)
• Substantial self diagnosis function
(1) B/W composite video signal generating function
(micom inside, green crossbar added)
(2) Generating function of audio signal equivalent to
1kHz (micom inside)
(3) Detecting function of power protection circuit opera-
tion
(4) Detecting function of abnormality in IIC bus line
(5) Functions of LED blink indication and OSD indica-
tion
(6) Block diagnosis function which uses new VCD and
AV SW
SDA
SCL
Start
condition
1 - 7
Address
8
R/W
Approx.180µS
9
Ack Data
1 - 7
Fig. 3-1
18
9
8
Ack
1 - 7
Some device may have no data,
or may have data with several
bytes continuing.
8
DATA Ack
9
Stop
condition
4. MICROCOMPUTER TERMINAL FUNCTION
S
TMP87CS38N3320 (QA01)
IIC
-BUS
GND
BAL
REM OUT
MUTE
SP MUTE
NC
POWER
LED
SSRST
DVD CONT
SCL0
SDA0
SYNC VCD
PIPRST
AFT2
AFT1
KEY-A
KEY-B
SGV
SGA
GND
10
11
12
13
14
15
16
17
18
19
20
21
1
2
3
4
5
6
7
8
9
GND
I
P40 (PWM0)
O
P41 (PWM1)
O
P42 (PWM2)
O
P43 (PWM3)
O
P44 (PWM4)
O
P45 (PWM5)
O
P46 (PWM6)
O
P47 (PWM7)
I
P50 (PWM8/TC2)
O
P51 (SCL1)
IO
P52 (SDA1)
I
P53 (AINO/TC1)
0
P54 (AIN1)
I
P55 (AIN2)
I
P56 (AIN3)
I
P60 (AIN4)
I
P61 (AIN5)
O
P62
O
P63
VSS
VDD
P57
P32
P57
SDA0
SCL0
(TC3)P31
(RXIN)P30
P20
RESET
XOUT
XIN
TEST
0SC2
0SC1
VD
OSD RESET
DATA
BUSY
CS
CLK
I
I
I
IO
O
I
I
I
I
O
I
I
O
I
I
0
O
I
O
O
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
VDD
ACP
SS VD
2
I C STOP
SDA1
SCL1
SYNC AV1
RMT IN
EXT SP
RESET
XOUT
XIN
GND
0SC1
0SC2
VSYNC
OSD RESET
DATA
BUSY
CS
CLK
IIC BU
Fig. 3-2
19
<< MICROCOMPUTER TERMINAL NAME AND OPERATION LOGIC >>
No. Terminal Name Function In/Out Logic Remarks
1 GND 0V
2 BAL INPUT BALANCE Out PWM out
3 REM OUT REMOTE CONTROL Out Remote control output
SIGNAL OUT
4 MUTE SOUND MUTE OUT Out Sound mute output
5 SP MUTE SPEAKER MUTE Out In muting = H
6 DEF POW Out
7 POWER POWER ON/OFF OUT Out Power control In ON = H
8 LED POWER LED OUTPUT Out Power LED on-control
LED lighting = L
9 SS RST STARSIGHT RESET Out Reset = L 0V
10 DVD CONT DVD CONTROL Out DVD = L, Other = H 0V
11 SCL0 IIC BUS CLOCK OUT Out IIC bus clock output 0
12 SDA0 IIC BUS DATA IN/OUT In/Out IIC bus data input/output 0
13 SYNC VCD H SYNC INPUT In Main picture H. sync signal input
14 PIP RST PIP RESET Out Reset = L
15 AFT2 IN In Sub tuner AFT S-curve input
16 AFT1 UV MAIN S-CURVE In Main tuner AFT S-curve
SIGNAL signal input
17 KEY A LOCAL KEY INPUT In Local key detection: 0 to 5V
18 KEY B LOCAL KEY INPUT In Local key detection: 0 to 5V
19 SGV TEST SIGNAL OUT Out Test signal output In normal = L 0V
20 SGA TEST AUDIO OUT Out Test audio output In normal = L 0V
21 VSS POWER GROUNDING — 0V: Gounding voltage 0V
22 CLK CLOCK OSD Out At display on: Pulse
23 CS CHIP SELECT Out At display on: Pulse
24 BUSY BUSY OSD In At display on: Pulse
25 DATA DATA OSD Out At display on: Pulse
26 OSD RESET RESET OSD Out Reset = L
27 VSYNC In VSYNC Pulse
28 OSC1 DISPLAY CLOCK Out 4.5MHz Pulse
29 OSC2 DISPLAY CLOCK In Pulse
30 TEST TEST MODE In GND fixed 0V
31 XIN SYSTEM CLOCK In System clock input 8MHz pulse
32 XOUT SYSTEM CLOCK Out System clock output 8MHz 8MHz pulse
33 RESET SYSTEM RESET In System reset input (In reset = L) 5V
34 EXT SP EXTERNAL SPEAKER In EXTERNAL = L, INT = H
35 RMT IN REMOTE CONTROL In In remote control pulse input = L In reception of
SIGNAL INPUT remote pulse
36 SYNC AV1 HSYNC INPUT In External H. sync signal input Pulse
37 SCL1 IIC BUS CLOCK OUT Out IIC bus clock output 1 Pulse
38 SDA1 IIC BUS DATA IN/OUT In/Out IIC bus data input/output 1 Pulse
39 I2C STP IIC BUS STOP In STOP = L
40 SS VD STARSIGHT VD In VSYNC for Starsight Pulse
41 ACP NSYNC INPUT In AC pulse input
42 VDD POWER — 5V 5V
20
5. EEPROM (QA02)
EEPROM (Non vola tile memory) has function which, in spite
of power-off, memor izes the such condition as channel selecting data, last memory status, user control and digital processor data. The capacity of EEPROM is 8k bits.
EEPROM(QA02)
A0
1
Device adress
GND
A1
A2
Vss
2
3
4
6. ON SCREEN FUNCTION
The OSD system of TW40F80 employs the external OSD
IC (QR60, MB90091) to obtain high quality OSD.
Type name is 24LC08BI/P or ST24C08CB6, and those are
the same in pin allocation and function, and are exchangeable each other. This IC controls through I2C bus. The po wer
supply of EEPROM and MICOM is common. Pin function
of EEPROM is shown in Fig. 3-3.
Vcc + 5V
8
NC
7
SCL
6
SDA
5
I2C-BUS line
Fig. 3-3
QR60 is controlled by the microprocessor QA01 with the
exclusive control signals of CLK, DATA, CS, BUSY, RESET.
CLK
CS
BUSY
DATA
OSD RESET
22
23
24
25
26
VIDEO
(YM)
Fig. 3-4
54
56
58
55
16
64
SCLK
SCS
TRE
SIN
RESET
VOB2
QR60 MB90091QA01 Microprocessor
R OUT
G OUT
B OUT
59
60
61
21
7. SYSTEM BLOCK DIAGRAM
QA01
TMP87CS38N-XXXX
QA02
Memory
24LC08BI/P
SDA SCL
5
V.sync
pulse
Remote
controller
output
Audio mute
Speaker
mute
QR60
OSD
MB90091
CLK
54
6
DATA
55
SCL 0
11
SDA 0
12
INT4
40
VSYNC
27
RMT OUT
3
MUTE
4
SP MUTE
5
DATA
25
CLK
22
CS
23
BUSY
24
RESET
26
CS BUSY
5856
SDA 1
SCL 1
RMT
KEY-A
KEY-B
RST
VDD
GND
VSS
POWER
ACP
LED
XIN
XOUT
SGV
SGA
SYNC-AV1
AFT1 IN
SYNC-AV2
AFT2 IN
QH30
C/C,EDS
XC144144P
SDA SCL
14
38
17
32
20
16
15
37
35
18
33
42
1
21
7
41
8
31
19
Main screen
36
Sub screen
13
2
Remote
controller
light
receiving
unit
Key
switch
Power
supply
circuit
8MHz
Clock
Signal
output
Sync det.
AFT det.
Sync det.
AFT det.
SDA SCL
SDA SCL
SDA SCL
2827
SDA SCL
2021
SDA SCL
25
24
SDA SCL
1920
SDA SCL
HO01
HY01
Q501
HO02
QV01
QZ01
QY91
Main U/V tuner
ELA12L
Sub U/V tuner
EL922L
VCD
TA1222AN
IF/MPX/A.PRO
MVUS5345
AV SW
TA1218N
DPC unit
DATA CLK
YCS
TC9086F
DUAL microprocessor
POP
TC9092F
QY03
QX01
WAC
TC9097F
SDA SCL
60
59
Q701
CONVER
T7K64
SDA SCL
44
43
Fig. 3-5
22
AUTO LIVE
SDA SCL
39
40
QK06
8. LOCAL KEY DETECTION METHOD
17
SA08
SA06
SA05
SA07
18
SA01
SA02
SA03
SA04
Local key detection in the N5SS chassis is carried out by
using analog like method which detects a voltage appears at
local key input terminals (pins 17 and 18) of the microcomputer when a key is pushed. With this method using two
local key input terminals (pins 17 and 18), key detection up
to maximum 14 keys will be carried out.
The circuit diagram shown left is the local key circuit. As
can be seen from the diagram, when one of keys among SA01 to SA-08 is pressed, each of two input terminals (pins 17
and 18) developes a voltage VIN corresponding to the key
pressed. (The voltage measurement and key identification
are carried out by an A/D con v erter inside the microprocessor and the software.
Fig. 3-6 Local key assignment
Key No. Function Key No. Function
SA-02 POWER SA-01
SA-03 CH UP
SA-04 CH DN
SA-05 VOL UP
SA-06 VOL DN
SA-07 ANT/VIDEO, ADV
SA-08 MENU
Table 3-1 Local key assignment
DEMO START/STOP
23
9. REMOTE CONTROL CODE ASSIGNMENT
Custom codes are 40-BFH (TV set for North U.S.A.)
Code
00H 0 Channel
01H 1 Channel
02H 2 Channel
03H 3 Channel
04H 4 Channel
05H 5 Channel
06H 6 Channel
07H 6 Channel
08H 8 Channel
09H 8 Channel
0AH 100 Channel
0BH ANT 1/2
0CH RESET
0DH AUDIO
0EH PICTURE/FUNC
0FH TV/VIDEO
10H MUTE
11H CHANNEL SEARCH
12H POWER
13H MTS
14H ADD/ERASE
15H TIMER/CLOCK
16H AUTO PROGRAM
17H CHANNEL RETURN
18H DSP/SUR (TV/CATV)
19H CONTROL UP
1AH VOLUME UP
1BH CHANNEL UP
1CH RECALL
1DH CONTROL DOWN
1EH VOLUME DOWN
1FH CHANNEL DOWN
40H PIP LOCATE
41H PIP LOCATE
42H PIP LOCATE
43H PIP LOCATE
44H CARVER
45H SURROUND UP
46H SURROUND DOWN
47H VOCAL ZOOM
48H CHANNEL LOCK
49H
4AH PIP CHANNEL UP
4BH PIP CHANNEL DOWN
4CH PIP STILL/RELEASE
PIP ZOOM, ZOOM SIZE
4DH
4EH PIP LOCATE (CH SEARCH)
4FH PIP SOURCE
Function to remote
Applicable
control
Applicable Conti-
to TV set nuity
Custom codes are 40-BFH (TV set for North U.S.A.)
Code
Function to remote
Applicable
control
50H PIP STILL
51H PIP ON/OFF
52H Do not use. Old type core power ON
53H PIP SWAP
54H PIC SIZE
55H DSP F/R
56H WIDE/SCROLL
57H CAPTION
58H EXIT
59H CYCLONE, SBS
5AH SET UP
5BH OPTION
5CH SUB WOOFER UP
SUB WOOFER DOWN
5DH
5EH
5FH
80H MENU
81H EDS
82H ADV UP
83H ADV DWN
84H
85H GUIDE
86H THEME
87H LIST
88H PIP CONTROL
89H ENTER/TUNE
8AH PAGE UP
8BH DATA UP
8CH PAGE DN
8DH DATA DN
8EH CANCEL
8FH REC
90H
91H
92H Do not use. Old type core power ON
93H
94H
95H
96H
97H NOISE CLEAN
98H
99H
9AH PIP VOLUME UP
9BH
9CH PIP CONTROL
9DH
9EH PIP VOLUME DOWN
9FH
Applicable Conti-
to TV set nu ity
24
Custom codes are 40-BFH (TV set for North U.S.A.)
Custom codes are 40-BFH (TV set for North U.S.A.)
Code Applicable Conti-
A0H SUB-BRIGHT ADJUSTMENT
A1H G. DRIVE ADJUSTMENT
A2H B. DRIVE ADJUSTMENT
A3H
CUTOFF DRIVE 40H INITIALIZING,
A4H
HORIZONTAL ONE LINE
A5H R. CUTOFF ADJUSTMENT
A6H G. CUTOFF ADJUSTMENT
A7H B. CUTOFF ADJUSTMENT
A8H
MEMORY ALL AREA INITIALIZE
A9H PIP BRIGHT ADJUSTMENT
AAH SUB CONTRAST ADJUSTMENT
ABH
HOR, VER PICTURE POSITON ADJUSTMENT
ACH SUB COLOR ADJUSTMENT
ADH SUB TINT ADJUSTMNET
AEH ADJUSTMENT-UP
AFH ADJUSTMENT-DOWN
B0H
HORIZONTAL ONE LINE: SERVICE
B1H DSP ON/OFF
B2H TEXT-1
B3H
TV/PIP VIDEO CHANGE-OVER
B4H CAPTION-1
B5H
B6H
B7H TV/CABLE CHANGE-OVER IN
SAME TIME ON MAN AND SUB
B8H HOTEL SETTING MENU
B9H DATA 4 TIMES SPEED UP
BAH DATA 4 TIMES SPEED DOWN
CHANGE-OVER OF HOTEL/NORMAL
BBH
BCH PIP CENTER
BDH M MODE
BEH CAPTON OFF
BFH ALL CHANNEL PRESET
C0H
C1H DIRECT WIDE 1
C2H DIRECT FULL
C3H
C4H
C5H
C6H
C7H
C8H
C9H
CAH
CBH
CCH
CDH
CEH
CFH
Function
to TV set nuty
Code Applicable Conti-
D0H
D1H
D2H Do not use. Old type core power ON
D3H
D4H
D5H
D6H
D7H PIP VIDEO ADJ.
D8H STILL, FRAME ADVANCE
D9H
DAH SPEED
DBH
DCH ZOOM
DDH
DEH
DFH
E0H
E1H
E2H
E3H
E4H
E5H
E6H
E7H
E8H
E9H
EAH
EBH
ECH TEST TONE
EDH DOLBY
EEH
EFH DPC
E0H
E1H
F2H SCROOL
F3H
F4H
F5H
F6H
F7H
F8H
F9H
FAH
FBH
FCH
FDH
FEH
FFH
Function
PINCUTION/EW CORER (PARA/CNR)
VERTICAL S-CUVE CORRECTION/
VERTICAL M-CURVE
CORRECTION (VSC/FVC)
HORIZONTAL WIDTH (WID/PARA)
TRAPEZOIDE CORRECTION (TRAP)
3 DIMENTIONAL Y/C SEPARATION
STANDARD (HEIGHT LINEARITY) (VLIN/HIT)
WIDE (HEIGHT ® LINEARITY) (VLIN)
WIDE 1, 2, 3
to TV set nuty
25
9-1. Optional Setting for Each Model
OPT0 OPT1
MODELS
D7
D6
D5
D4
D3
D2
D1
D0
HEX
D7
D6
D5
D4
D3
D2
D1
D0
HEX
CN35F90
CN35F95
CX35F70
TW56F80
TW40F80
TP61F90
TP61F80
TP55F80
TP55F81
TP50F90
TP50F60
TP50F61
0
*
0
*
1
*
0
*
1
*
0
*
0
*
0
*
0
*
0
*
1
*
1
*
DSP0/SRD1
NOT USED
0
0
0
0
0
0
0
0
0
0
0
0
PP0/MP1
0
*
0
*
1
*
0
*
1
*
0
*
1
*
1
*
1
*
0
*
1
*
1
*
SS/0 NONSS/1
NOT USED
0
0
0
0
0
0
0
0
0
0
0
0
Normal 0/f0 STOP 1
0
*
0
*
1
*
1
*
1
*
1
*
1
*
1
*
1
*
1
*
1
*
1
*
CYC0/SBS1
NOT USED
00H
00H
02H
02H
92H
02H
12H
12H
12H
02H
92H
92H
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
MODE:
Fixed
Normal00
STD: 01
HRC:10
1RC: 11
Normal 0/Free run 1
0
0
0
0
0
0
1
1
1
1
1
1
1
0
1
0
1
0
1
0
1
0
1
0
NON0/CONV1
NON0/3DYC
0
0
0
1
0
1
0
0
0
1
0
0
NON0/DOLBY1
*
*
*
*
*
*
*
*
*
*
*
*
NOT USED
*
*
*
*
*
*
*
*
*
*
*
*
00H
00H
00H
1CH
18H
1CH
18H
10H
10H
14H
10H
10H
NOT USED
• When the character generation is changed from
MB90091-107 TO MB90091-108, D5 bit of OPT0 in
the design data should be set to “1”.
26
10. ENTERING TO SERVICE MODE
12. SERVICE ADJUSTMENT
1. PROCEDURE
(1) Press once MUTE key of remote hand unit to indicate
MUTE on screen.
(2) Press again MUTE key of remote hand unit to keep
pressing until the next procedure.
(3) In the status of above (2), wait for disappearing of in-
dication on screen.
(4) In the status of above (3), press MENU (Channel set-
ting) key on TV set.
2. Service mode is not memorized as the last-memory.
3. During service mode, indication S is displayed at upper
right corner on screen.
11. TEST SIGNAL SELECTION
1. In OFF state of test signal, SGA terminal (Pin 20) and
SGV terminal (Pin 21) are kept “L” condition.
2. The function of VIDEO test signal selection is cyclically
changed with VIDEO key (remote unit).
Table 3-2
1. ADJUSTMENT MENU INDICATION ON/OFF :
MENU key (on TV set)
2. During display of adjustment men u, the followings are
effective.
a) Selection of adjustment item :
POS UP/DN key (on TV/remote unit)
b) Adjustment of each item :
VOL UP/ DN key (on TV / remote unit)
c) Direct selection of adjustment item
R CUTOFF : 1 POS (remote unit)
G CUTOFF : 2 POS (remote unit)
B CUTOFF : 3 POS (remote unit)
d) Data setting for PC unit adjustment
SUB CONTRAST : 4 POS (remote unit)
SUB COLOR : 5 POS (remote unit)
SUB TINT : 6 POS (remote unit)
e) Horizontal line ON/OFF : VIDEO (on TV set)
f) Test signal selection : VIDEO (remote unit)
* In service mode, serviceable items are limited.
Test Signal No.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Name of Pattern
Signal OFF
All black signal + R single color (OSD)
All black signal + G single color (OSD)
All black signal + B single color (OSD)
All black signal
All white signal
W/B
Black cross bar
White cross bar
Black cross hatch
White cross hatch
White cross dot
Black cross dot
H signal (bright area)
H signal (dark area)
Black cross + G signal color
3. Test audio signal ON / OFF: 8 POS (remote unit)
* Test audio signal : 1 kHz
4. Self check display : 9 POS (remote unit)
* Cyclic display (including ON/OFF)
5. Initialization of memory :
CALL (remote unit) + POS UP (on TV set)
6. Initialization of self check data :
CALL (remote unit) + POS DN (on TV set)
7. BUS OFF :
CALL (remote unit) + VOL UP (on TV set)
(3) SGA (audio test signal) output should be square wave
of 1 kHz.
27
13. FAILURE DIAGNOSIS PROCEDURE
Model of N5SS chassis is equipped with self diagnosis function inside for trouble shooting.
13-1. Contents to be Confirmed by Customer
Table 3-3
Contents of self diagnosis
A. DISPLAY OF FAILURE INFORMATION IN NO
PICTURE (Condition of display)
1. When power protection circuit operates;
2
2. When I
C-BUS line is shorted;
Power indicator lamp blinks and picture does not come.
1. Power indicator red lamp blinks. (0.5 seconds interval)
2. Power indicator red lamp blinks. (1 seconds interval)
If these indication appears, repairing work is required.
Display items and actual operation
13-2. Contents to be Confirmed in Service Work (Check in self diagnosis mode)
Table 3-4
Contents of self diagnosis
Contents of self diagnosis
< Countermeasure in case that phonomenon always arises >
B. Detection of shortage in BUS line.
C. Check of comunication status in BUS line.
D. Check of signal line by sync signal detection.
E. Indication of part code of microcomputer (QA01).
F. Number of operation of power protection circuit.
Display items and actual operation
NO. 239XXXX
POWER: 000000
BUS LINE: OK
BUS CONT: OK
BLOCK: UV V1 V2
QV01, QV01S
Display items and actual operation
(Example of screen display)
SELF CHECK
Part coce of QA01
Number of operation of
power protection circuit
Short check of bus line
Communication check of
busline
E
F
B
C
D
13-3. Executing Self Diagnosis Function
[CAUTION]
(1) When executing block diagnosis, get the desired input
mode (U/V BS VIDEO1, 2, 3) screen, and then enter
the self diagnosis mode.
(2) When diagnos other input mode, do again diagnosis
operation.
13-3-1. Procedure
(1) Set to service mode.
(2) Pressing “9” key on remote unit displays self diagno-
sis result on screen.
Every pressing changes mode as below.
SERVICE mode SELF DIAGNOSIS mode
(3) To exit from service mode, turn power off.
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13-4. Understanding Self Diagnosis Indication
In case that phenomenon always arises. See Fig. 3-7 .
(Example of screen display)
SELF CHECK
NO. 239XXXX
POWER: 000000
BUS LINE: OK
BUS CONT: OK
BLOCK: UV V1 V2
QV01, QV01S
Part coce of QA01
Number of operation of
power protection circuit
Short check of bus line
Communication check of
busline
Fig. 3-7
E
F
B
C
D
Item
BUS LINE
BUS CONT
BLOCK: UV1
UV2
V1
V2
Table 3-5
Contents
Detection of bus line short
Communication state of bus line
The sync signal part in each video signal
supplied from each block is detected.
Then by checking the existence or non of sync
part, the result of self diagnosis is displayed
on screen. Besides, when “9” key on remote
unit is pressed, diagnosis operation is first
executed once.
Instruction of results
Indication of OK for normal result, NG for abnormal
Indication of OK for normal result
Indication of failure place in abnormality
(Failure place to be indicated)
QA02 NG, H001 NG, Q501 NG, H002 NG, QV01 NG, Q302
NG, QY02 NG, HY01 NG, QD04 NG, QM01 NG, Q701 NG
Note:
The indication of failure place is only one place though
failure places are plural. When repair of a failure place
finishes, the next failure place is indicated. (The order of
priority of indication is left side.)
*Indication by color
• Normal block : Green
• Non diagnosis block : Cyan
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13-4-1. Clearing method of self diagnosis result
In the error count state of screen, press “CHANNEL DOWN”
button on TV set pressing “DISPLAY” button on remote unit.
CAUTION:
All ways keep the following caution, in the state of service
mode screen.
• Do not press “CHANNEL UP” button. This will cause
initialization of memory IC. (Replacement of memory
IC is required.)
• Do not initialize self diagnosis result. This will change
user adjusting contents to factory setting value. (Adjustment is required.)
13-4-2. Method utilizing inner signal
(VIDEO INPUT 1 terminal should be open.)
(1) With service mode screen, press VIDEO button on re-
mote unit. If inner video signal can be received, QV01
and after are normal.
(2) With service mode screen, press “8” button on remote
unit. If sound of 1 kHz can be heard, QV01 and after
are normal.
* By utilizing signal of VIDEO input terminal, each circuit
can be checked. (Composite video signal, audio signal)
White
Yellow
Cyan
Green
Magenta
Red
Blue
(COLOR BAR SIGNAL)
Color elements are positioned in sequence of
high brightness.
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