TOSHIBA CN27E90, CN35E15, CN35E95 TECHNICAL TRAINING MANUAL

NTDCTV05

TECHNICAL TRAINING MANUAL N5SS (TG-1, C) CHASSIS

COLOR TELEVISION

CN27E90, CX32E70 CN32E90, CN35E15 CF35E50, CX35E60 CX35E70, CX35E81 CN35E90, CN35E95

PRINTED IN JAPAN Aug. 1995 So

SECTION I

OUTLINE......................................................................6

1. OUTLINE OF N5SS CHASSIS (CN32E90, CN35E90) .................................................................... 7

2. PC BOARD CONFIGURATION........................................................................................................ 7

3. MAJOR SPECIFICATIONS (NEW FUNCTIONS IN ADDITION TO THOSE OF N5SS)........ 7

4. MODIFICATIONS ON CHASSIS..................................................................................................... 7

5. CONSTRUCTION OF CHASSIS...................................................................................................... 8

6. LOCATION OF CONTROLS............................................................................................................ 9

7. CN32D90 BLOCK DIAGRAM ......................................................................................................... 13

8. [US, CANADA] SPECIFICATION FOR MODEL's 1995 ............................................................ 14

SECTION II

TUNER, IF/MTS/S.PRO MODULE.........................16

1. CIRCUIT BLOCK ............................................................................................................................. 17

2. TUNER ................................................................................................................................................ 18

3. IF/MTS/S.PRO MODULE................................................................................................................. 19

4. PIP TUNER......................................................................................................................................... 23

SECTION III

CHANNEL SELECTION CIRCUIT........................24

1. OUTLINE OF CHANNEL SELECTION CIRCUIT SYSTEM.................................................... 25

2. OPERATION OF CHANNEL SELECTION CIRCUIT ................................................................ 25

3. MICROCOMPUTER......................................................................................................................... 26

4. MICROCOMPUTER TERMINAL FUNCTION ........................................................................... 27

5. EEPROM (QA02) ............................................................................................................................... 29

6. ON SCREEN FUNCTION................................................................................................................. 29

7. SYSTEM BLOCK DIAGRAM .........................................................................................................30

8. LOCAL KEY DETECTION METHOD .......................................................................................... 31

9. REMOTE CONTROL CODE ASSIGNMENT............................................................................... 32

10. ENTERING TO SERVICE MODE................................................................................................ 35

11. TEST SIGNAL SELECTION ......................................................................................................... 35

12. SERVICE ADJUSTMENT.............................................................................................................. 35

13. FAILURE DIAGNOSIS PROCEDURE......................................................................................... 36

14. TROUBLE SHOOTING CHART .................................................................................................. 38

SECTION IV

AUDIO OUTPUT CIRCUIT .....................................41

1. OUTLINE............................................................................................................................................ 42

2. AUDIO OUT IC.................................................................................................................................. 43

SECTION V

A/V SWITCHING CIRCUIT ....................................44

1. OUTLINE............................................................................................................................................ 45

2. IN / OUT TERMINALS..................................................................................................................... 45

3. CIRCUIT OPERATION.................................................................................................................... 45

SECTION VI

VIDEO PROCESSING CIRCUIT............................47

1. OUTLINE............................................................................................................................................ 48

2. SIGNAL FLOW.................................................................................................................................. 48

3. CIRCUIT OPERATION.................................................................................................................... 48

SECTION VII

V/C/D/IC......................................................................52

1. OUTLINE............................................................................................................................................ 53

2. LARGE SCALE EMPLOYMENT OF BUS CONTROL OF PARAMETER FOR PICTURE

CONTROLS...................................................................................................................................... 53

3. EMPLOYMENT OF CONTAINING EACH VIDEO BAND FILTER INSIDE.......................... 53

4. EMPLOYMENT OF CONTAINING EACH FILTER (FOR S/H) INSIDE................................. 53

5. LOW COST OF IC ............................................................................................................................ 53

SECTION VIII

PIP MODULE.............................................................55

SECTION IX SYNC SEPARATION, H-AFC,

H-OSCILLATOR CIRCUITS..............................58

1. SYNC SEPARATION CIRCUIT ......................................................................................................59

2. H AFC (Automatic Frequency Control) CIRCUIT......................................................................... 60

3. H OSCILLATOR CIRCUIT ............................................................................................................. 61

SECTION X

VER TICAL OUTPUT CIRCUIT .............................63

1. OUTLINE............................................................................................................................................ 64

2. V OUTPUT CIRCUIT ....................................................................................................................... 65

SECTION XI

HORIZONTAL DEFLECTION CIRCUIT..............69

1. OUTLINE............................................................................................................................................ 70

2. HORIZONTAL DRIVE CIRCUIT................................................................................................... 70

3. BASIC OPERATION OF HORIZONTAL DRIVE ........................................................................ 71

4. HORIZONTAL OUTPUT CIRCUIT............................................................................................... 74

5. HIGH VOLTAGE GENERATION CIRCUIT................................................................................. 79

6. X-RAY PROTECTION CIRCUIT ................................................................................................... 82

7. OVER CURRENT PROTECTION CIRCUIT................................................................................ 83

8. KINK CORRECTION CIRCUIT..................................................................................................... 84

SECTION XII DEFLECTION DISTORTION CORRECTION

CIRCUIT (Side DPC Circuit)..............................85

1. DEFLECTION DISTORTION CORRECTION IC (TA8859P) .................................................... 86

2. SIDE DPC............................................................................................................................................ 87

3. DIODE MODULATOR CIRCUIT ................................................................................................... 88

4. ACTUAL CIRCUIT........................................................................................................................... 89

SECTION XIII

CLOSED CAPTION/EDS CIRCUIT .......................92

1. OUTLINE............................................................................................................................................ 93

2. DATA TRANSMISSION FORMAT ................................................................................................ 93

3. DISPLAY FORMAT........................................................................................................................... 94

4. CIRCUIT OPERATION.................................................................................................................... 95

SECTION XIV

POWER CIRCUIT.....................................................98

1. OUTLINE............................................................................................................................................ 99

2. RECTIFYING CIRCUIT AND STANDBY POWER SUPPLY................................................... 100

3. MAIN SUPPLY CIRCUIT............................................................................................................... 100

4. OUTLINE OF CURRENT RESONANT TYPE SUPPLY ........................................................... 101

5. FUNDAMENTAL THEORY........................................................................................................... 101

6. ACTUAL CIRCUIT......................................................................................................................... 102

7. OTHER POWER CIRCUIT ........................................................................................................... 105

8. PROTECTOR MODULE (Z801).................................................................................................... 106

SECTION XV

DSP CIRCUIT ..........................................................109

1. ORIGINS OF DOLBY SURROUND ............................................................................................. 110

2. THE DOLBY MP MATRIX............................................................................................................ 110

3. THE DOLBY SURROUND DECODER.........................................................................................111

4. DSP CIRCUIT ...................................................................................................................................111

5. DSP (Digital Surround Processor) IC............................................................................................. 114

6. SURROUND CIRCUIT ................................................................................................................... 116

7. INPUT BALANCE CIRCUIT......................................................................................................... 116

8. MATRIX CIRCUIT ......................................................................................................................... 117

9. FILTER CIRCUIT (ANTI-ALIAS FILTER)................................................................................. 117

10. DSP CIRCUIT (DELAY) ............................................................................................................... 118

11. 7 kHz LOW PASS FILTER ........................................................................................................... 119

12. DOLBY NR CIRCUIT................................................................................................................... 120

13. DSP FRONT ADDITION CIRCUIT............................................................................................ 121

14. BUS CONVERTER........................................................................................................................ 122

15. NEUTRAL BIAS ............................................................................................................................ 122

16. AUDIO OUTPUT AMPLIFIER (For Rear SP) .......................................................................... 123

17. TROUBLESHOOTING CHART ................................................................................................. 124

SECTION XVI

FAILURE DIAGNOSIS PROCEDURES...............125

1. H STARTING CIRCUIT FAILURE DIAGNOSIS PROCEDURES........................................... 126

2. DEFLECTION CIRCUIT FAILURE DIAGNOSIS PROCEDURES......................................... 127

3. LEFT-RIGHT PIN-CUSHION DISTORTION CORRECTION CIRCUIT.............................. 128

4. X-RAY PROTECTION CIRCUIT FAILURE DIAGNOSIS PROCEDURES........................... 129

5. PROTECTION CIRCUIT DIAGNOSIS PROCEDURE ............................................................. 130

6. VIDEO CIRCUIT DIAGNOSIS PROCEDURES......................................................................... 131

SECTION I

OUTLINE

1. OUTLINE OF N5SS CHASSIS (CN32E90, CN35E90)

The N5SS chassis is a complete bus control type chassis where the deflection circuit is controlled by a newly developed I2C-bus line control system.

3. MAJOR SPECIFICATIONS (NEW FUNCTIONS IN ADDITION TO THOSE OF N5SS)

(1) EOS (Extended-Data-Service) (2) Center-Ch-Audio-Input provided

2. PC BOARD CONFIGURATION

(1) Signal unit (2) Power/def unit (3) A/V, CRT-D, SP-TERM (4) CCD, comb (CN32E90)

Digital comb (CN35E90) (5) D.S.P unit (6) C.C, EDS/R.G.B SW

4. MODIFICATIONS ON CHASSIS

(1) Serviceability improved with direct, front access system

employed. (2) One touch cabinet securing (CN32E90) to the chassis. (3) Improved serviceability with the bus control system

employed for the defection circuits. (4) Improved serviceability with the white balance bus

control system employed. (5) Digital comb/CCD miniaturized into a socketable size.

5. CONSTRUCTION OF CHASSIS

REAR AMP circuit

SIGNAL circuit

IF/MTS/A-PRO module

DPC circuit

CCD circuit

PIP circuit

EDS, RGB SW circuit

AUDIO OUT

CRT circuit

Fig. 1-1

POWER/DEF circuit

CONVERTER trans

A/V circuit

RF SW

V. OUT

DPC circuit

H.OUT

H.OUT trans

6. LOCATION OF CONTROLS

6-1. TV Set

For specific use of each control, consult the corresponding page numbers in brackets.

Front View

POWER indicato

POWER

POWER button

Remote sensor

Behind the door

VIDEO/AUDIO IN jacks <VIDEO 3>

DEMO button

MENU button

Press to open the door

CHANNEL

VOLUME

-/+buttons

ANT/VIDEO button ADV button

buttons

Fig. 1-2

Rear view

S-VIDEO IN jack <VIDEO 1>

VARiable AUDIO OUT

ANTenna terminals

EXTernal SPEAKER

erminals

MAIN SPEAKER switch

REAR SPEAKER terminals

jacks

VIDEO AUDIO OUT jacks

PIP AUDIO OUT jacks

VIDEO/AUDIO IN jacks <VIDEO 2>

VIDEO/AUDIO IN jacks <VIDEO 1>

Fig. 1-3

6-2 Location of Controls (Remote Control)

Only the buttons that are used to operate the TV set are described here. For details on the use of each control, refer to pages in brackets.

Aim at the remote sensor on the TV

Learn/Transmit indicator

EDS button

TV/CABLE/VCR/AUX switch

Set to "TV" to control the TV.

TV/VIDEO

Channel Number buttons

PIP function buttons

AUDio button PICture button RESET button

ANT 1/2 button

C.CAPT button CYS/SBS button Learning buttons

You can use these eight buttons only as Learning function buttons. They are not affected by Mode selection (TV/CABLE/ VCR/AUX).

TIMER button

RECALL button

POWER button

MUTE button

CHANNEL buttons

VOLUME buttons

RTN buttons

SET UP button OPTION button EXIT button

-\+ buttons FAV -/+ buttons

DSP/SUR button DSP F/R button

LEAR/USE switch

To operate buttons inside the cover, slide the cover down and toward you.

Fig. 1-4

6-3 Monitor Panel

This TV set is equipped with S-VIDEO INPUT jacks, VIDEO/AUDIO INPUT jacks, VIDEO/AUDIO OUTPUT jacks, VARIABLE AUDIO OUTPUT jacks, PIP AUDIO OUTPUT jacks and EXTERNAL SPEAKER terminals for connecting your desired video/audio equipment.

TV Front

935

TV Rear

11 1 2

Fig. 1-5

, , VIDEO 1/VIDEO 2/VIDEO 3 IN Jacks —

provide for direct connection of video devices (VCR, video disc player, camcorder, etc.) with video/audio outputs.

, S-VIDEO IN Jacks —provide for direct S-video

connection from an VCR or a video disc player. The TV's VIDEO 1/3 audio jacks can also be used to connect the VCR's audio cables.

VIDEO/AUDIO OUT Jacks --- provide fixedlevel audio and video outputs from whatever is displayed on the screen.

VARIABLE AUDIO OUT Jacks --- feed volume-controlled stereo audio out from whatever is displayed on the screen, allows connection of audio amplifier and lets you adjust sound level with TV's remote.

PIP AUDIO OUT Jacks — provide fixed-level audio outputs from whatever is displayed on the PIP window screen.

EXTERNAL SPEAKER Terminals — provide for direct connection of external speakers.

MAIN SPEAKER Switch — lets you turn off TV's built-in speakers so that sound will instead come through speakers connected to EXTERNAL SPEAKER terminals.

REAR SPEAKER Terminals — provide for direct connection of the supplied Surround Speakers.

7. CN32D90 BLOCK DIAGRAM

FOCUS

TA1222N

R370

301

V OUTPUT

YsRG

323534

SCREEN

+27V

TA8427K

SDA SCL

CRT

V H

+200V

GREEN OUTPUT

SPEED MOD

CRT DRIVE PCB

RED OUTPUT

144

143

144

434241

RGB

SYNC

YIO

5838373534

BLUE OUTPUT

145

Q501

HIGH VOLTAGE

T461

Q370

2SA933SQ

Q462 DPC

2SC1740S-Q

Q404

H OTUTPUT

Q402

H DRIVE

Q302

TA8859AP

E/W CORRECTION

27 28 13

2SD2253(FA)

2SC1569FA-5

Bus line

C I

-27V

FBT

D840

TB40

TFB

D371

4132AD

4132BD

HEATER

F801 TB01

T862

D801

SR801

D471

33V

+125V

Z801

PROTECTOR

Q420 9V-1

+24.5V

D883 F470 2A

Q801

D885 F883 5A

TRANS

D847

Q840

L78MR05

+12V

CONVERTER

}

PROTECTOR

STBY 5V

RESET

2SC1B15Y

POWER/DEF UNIT

QE06

STROVER HEAT OVER VOLTAGE VOLTAGE REG.

Q670

AUDIO OUT

R883

Q862

TLP621GR-L

PHOTO-COUPLER

11812

TA8256H

R L W

R L WOOFER

SYNC SIGNAL DET.

SIGNAL UNIT

SCL

TUNER

EL922L

HY01(CHILD)

SDA

U/V

145

S(L)

H002

V/SIF/MTS

TUNER

H001(MOTHER)

PIP

MODULE

S(R)

MVUS34S

SCL

EL466L

11 12

SDA

6 B

DC DD

PB5419

C-BUS LINE

CCD UNIT

V Y C

Q831

Q832

9V-2

Q830

5V-2

5V-3

EDS/C.C

32 31 30 29

SDA SCL STOP SYNC

QA01 MICROCOMPUTER

KEY

CONTROL

V-AV

KEY

VIDEO

CONTROL

SCL

ICA02

MEMORY

SDA

INPUT 3

24LCO4BI/P

ST24C04CB6

TMP87CS38N-3152

434530 RLY

V L R V Y

QV01 SIGNAL SW

VIDEO

Y-COMB

EJEIAJ

TA1218N

INPUT 2

C-COMB

32 C

V SDA SCL C

34 2

24 1

42 25

VIDEO

INPUT 1

VAR-L

VIDEO

OUTPUT

VAR-R

L R

VAR

AUDIO

L R

PIP

AUDIO

A/V PCB

Fig. 1-6

8. [US, CANADA] SPECIFICATION FOR MODEL's 1995

CHASSIS C C C C C

MODEL Nbr CN27E90 CX32E70 CN32E90 CE35E15 CF35E50

SPECIFICATION HITACHI TDD TDD *TDD *TDD

1 Picture Tube *FST-D/T NF-D/T NF-D/T *FST-D/T FST-D/T 2 Channel Capacity 181ch 181ch 181ch 181ch 181ch

3 C. Caption ●●●●●

4 MTS with dbx ●●●●●

E N

5 Bass, Tre, Balance ●●●●●

6 Sub-Audio-Program ●●●●●

7 Remote band unit *A-Univ (42k) *A-Univ (42k) *Intelig+EZ *Unive (36k) *Unive (36k)

8 Picture-in-Picture ● (2TN) ● (2TN) ● (2TN) *● (1TN) ● (1TN)

9 LED Indicators (RED) ● (Power) ● (Power) ● (Power) *● (Power) ● (Power)

10 Local Keys 8key 8key 8key 8key 8key 11 Dolby Surround — — ● ——

12 Dig-Sound Processor — — ● (DSP4ch) — —

13 Front Surround ●●—●●

14 Cyclone ABX ● — ● ——

15 Sub-Bass-System — ● ———

16 Audio Output *10Wx2 & 13W 10Wx2 10Wx2 & 10Wx2 10Wx2

N D

17 Speaker Size & Nbr *80x120x2 70x130x2 80x120x2 70x130x2 70x30x2

18 Comb Filter *● (GLS) ● (CCD) ● (CCD) ● (CCD) ● (GLS)

19 Dy-Quadruple Focus — — — — —

20 Scan Velocity Modu ●●●●●

21 Vert Contour Corre ●●●●●

22 Black Level Expand ●●●●●

23 Flesh Tone Correct *●●●●●

U R

24 Dynamic Noise Reduc *●●●●●

25 Picture Preference ●●●●● 26 Horiz Resolution 650 700 700 800 800

27 Parental-Ch Lock ●●●●●

28 Channel Label (32ch) ●●●●●

29 3-Language Display ●●●●●

30 Clock/Off-Timer *●/●●/●●/●●/●●/●

31 Favorite Channel *● *● *● *● *●

E R

32 Extended-Data-Servi *● *● *● *● *● 33 Star-Sight-decoder — — — — —

34 S-Video In-Term ● (1+1) ● (1+1) ● (1+1) ● (1) ● (1) 35 Audio, Video-In/Out 1+2/— 1+2/1 1+2/1 *3/1 3/1

36 Front AV Jack *●●●——

T E

37 Variable Audio Out ●●●●●

38 2-RF Input ●●●——

39 Ext Speaker Term ●●●●●

40 PIP Audio Out Jack — *— *● —— 41 Center-Ch-Aud-Input — *● *— — —

42 Speaker-Box -- — ● SS-SR94 — —

* AC

43 Others — — — — — *Cabinet NEW CX32D70 CN32D90 *CE35D10 CF35D50 PARTS SUPPLY (ISO) — — — — —

CRT

13W & 5Wx2

& 100R (Hon) 100R & REAR

DERIV

CHASSIS C C C C C

MODEL Nbr CX35E60 CX35E70 CX35E81 CN35E90 CN35E95

SPECIFICATION TDD TDD TDD TDD TDD

1 Picture Tube FST-D/T NF-D/T NF-D/T NF-D/T NF-D/T 2 Channel Capacity 181ch 181ch 181ch 181ch 181ch

3 C. Caption ●●●●●

4 MTS with dbx ●●●●●

E N

5 Bass, Tre, Balance ●●●●●

6 Sub-Audio-Program ●●●●*●

7 Remote band unit *A-Univ (42k) *A-Univ (42k) *A-Univ (42k) *Intelig+EZ *Intelig+EZ

8 Picture-in-Picture ● (2TN) ● (2TN) ● (2TN) ● (2TN) ● (2TN)

9 LED Indicators (RED) ● (Power) ● (Power) ● (Power) ● (Power) ● (Power)

10 Local Keys 8key 8key 8key *8key *8key 11 Dolby Surround — — — ●●

12 Dig-Sound Processor — — — ● (DSP4ch) ● (DSP4ch)

13 Front Surround ●●●——

14 Cyclone ABX — — — ●●

15 Sub-Bass-System ●●●——

16 Audio Output 10Wx2 10Wx2 10Wx2 10Wx2 10Wx2

N D

17 Speaker Size & Nbr 70x130x2 70x130x2 70x130x2 80x120x2 & 80x120x2 &

18 Comb Filter ● (DIG) ● (DIG) ● (DIG) ● (DIG) ● (DIG)

19 Dy-Quadruple Focus ●●●●●

20 Scan Velocity Modu ●●●●●

21 Vert Contour Corre ●●●●●

22 Black Level Expand ●●●●●

23 Flesh Tone Correct ●●●●●

U R

24 Dynamic Noise Reduc ●●●●●

25 Picture Preference ●●●●● 26 Horiz Resolution 800 800 800 800 800

27 Parental-Ch Lock ●●●●●

28 Channel Label (32ch) ●●●●●

29 3-Language Display ●●●●●

30 Clock/Off-Timer ●/●●/●●/●●/●●/●

31 Favorite Channel *● *● *● *● *●

E R

32 Extended-Data-Servi *● *● *● *● *● 33 Star-Sight-decoder — — — — —

34 S-Video In-Term ● (1+1) ● (1+1) ● (1+1) ● (1+1) ● (1+1) 35 Audio, Video-In/Out 1+2/1 1+2/1 1+2/1 1+2/1 1+2/1

36 Front AV Jack ●●●●●

T E

37 Variable Audio Out ●●●●●

38 2-RF Input ●●●●●

39 Ext Speaker Term ●●●●●

40 PIP Audio Out Jack — *— *— *● *● 41 Center-Ch-Aud-Input — *● *● *— *—

42 Speaker-Box — — — ● SS-SR94 ● SS-SR94

* AC

43 Others — *VCR-Storate — *VCR-Stora *Cabinet C35D60 CX35D70 NEW (DAX) CN35D90 NEW (BLK) PARTS SUPPLY (ISO) — — — — —

CRT

CONSOLE CINEMA

& 13W, 5Wx2 & 13W, 5Wx2

*100R, REAR *120R, REAR

SECTION II

TUNER, IF/MTS/S.PRO MODULE

1. CIRCUIT BLOCK

EL466L

Tuner

RF AGC

1-1. Outline

IF/MTS/S.PRO Module MVUS34S

SAW Filter

AFT output

VIF/SIF Circuit

TP12

Video output

Fig. 2-1 Block diagram

SIF

output

To A/V switch circuit

Multiplex

R-OUTTVL-OUT

Sound Circuit

C-IN

S.PRO Circuit

R-IN L-IN

R-OUT

L-OUT

(L+R)

-OUT

C-OU

(1) RF signals sent from an antenna are converted into

intermediate 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

circuit 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.

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 integrated

PLL circuit is employed. (3) Wide band double SAW filter F1802R used. (4) FS (frequency synthesizer) type channel selection system

employed.

(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.

2. TUNER

2-1. Outline

(1) Type name: EL466L (2) Applicable 181CH (3) I2C-bus version (4) PLL-integrated

2-2-2. Terminals (Tuner section)

Name Function

IF OUT IF outputs (P=45.75 MHz, C=42.17 MHz,

S=41.25 MHz)

BM Tuner power supply (9V)

RF AGC Gain control terminal to obtain constant

IF output

VT Control voltage to select channels

PLL Selection

EL466L Tuner Section

1 2 3 4 5 6 7 8 9

Terminal No. Name

1 32V 25V 3 S-CLOCK 4 S-DATA 5 ADDRESS 6 IF OUT 7 BM (9V) 8 RF AGC 9VT

Fig. 2-2 Tuner terminal layout

2-2-3. Tuner VT Voltage (unit: V)

(1) VHF (2) UHF

CH VT voltage (TYP)

2 1.4 6 6.4

A-2 12.8

B 20.0 C 1.4

I 3.5

10 5.6

J 7.6 N 9.7 R 11.8

W 14.2

FF 17.9

LL 24.2

CH VT voltage (TYP)

MM 1.1

QQ 2.2

WW 4.0

14 5.8 20 7.8 26 9.2 32 10.8 38 12.5 44 13.9 50 15.0 56 17.2 62 19.4 69 23.6

* VT voltage not indicated for a channel falls between

those values for channels just upper and lower the channel.

2-2. Operation of the Tuner

2-2-1. Receiver Channels

VHF 2~13CH UHF 14~69CH 181CH in total CATV A-6~, J~W, AA~BBB, 65~92, 100~127CH

3. IF/MTS/S.PRO MODULE

The IF/MTS/S.PRO module (MVUS34S) limits bandwidth of IF signals and detects video and audio signals. The module consists of IF amplifiers, SAW (surface acoustic wave) filter, and PIF IC. The SAW filter has a wideband response to improve picture quality and audio buzz characteristic and, develops separate outputs of video and audio signals. The PIF IC employs a PLL complete sync detection + audio split carrier system.

3-1-2 Video PIF Circuit

A PIF detector switching carrier is oscillating at a frequency adjusted to 45.75 MHz with L051 (VCO CW coil) under no RF signal input. When an RF signal enters, an IF video carrier is fed to APC section from IF AMP inside the IC, and the detector switching carrier is adjusted by the APC, VCO, etc. in the PLL circuit so that its frequency and phase are matched to those of the IF video carrier to perform precise sync detection. Thus processed video output is developed at pin 21.

3-1. IF/MTS/S.PRO Module (MVUS34S) 3-1-1. Module Terminal Layout

Pin No. Name Pin No. Name

1 GND 15 DAC-OUT2 2 IF-IN 16 R-IN 3 NC 17 C-IN 4 +9V 18 L-IN 5 RF AGC 19 GND 6 AFC 20 SCL 7 VIDEO OUT 21 SDA 8 ADR SW 22 W-OUT

9 MPX OUT 23 C-OUT 10 --- 24 L-OUT 11 --- 25 GND 12 TV R-OUT 26 R-OUT 13 DAC-OUT1 27 +9V 14 TV L-OUT

PLL lock speed is automatically controlled by adding the video signal at pin 21 to pin 1. That is, since the video signal is not output at operations of power on, CH switching, etc., the APC filter between pin 16 and GND consists of C022 and C053, and R018, and the filter effect decreases, thus increasing PLL lock speed. Next, when a video out exists, the internal resistance is shortcircuited and the APC filter consists of C022 and C053, internal resistance, and R018. As a result, the filter effect increases and the PLL lock speed decreases. Consequently, under normal signal reception, phase of the detector switching carrier is locked in a stable condition if an IF video carrier is lost for a short time due to over modulation, etc. By combining such a PLL complete sync detection system and a wideband SAW filter shown in Fig. 2-4, a wideband (4.2 MHz) video detection output with less beat interference will be obtained.

3-1-3. Audio PIF Circuit

The IF signal fed through Q003 (Fig. 2-4) enters an audio section of the SAW filter (Z001) which has an IF bandwidth for dedicated audio signals, and only the audio signal of

41.25 MHz is fed to pin 7. The signal is sync-detected with the detection carrier completely synchronized with the IF video carrier and pin 14 develops a 4.5 MHz SIF signal. By using the PLL split carrier system just stated, audio signals with less buzz by the video signal will be reproduced. The 4.5 MHz SIF enters pin 15 through a 4.5 MHz filter, Z003 and pin 9 develops a FM-detected audio signal.

Fig. 2-3 IF/MTS/S.PRO module terminal layout

SIF BANDWIDTH

Z003

4.5MHz SIF SIGNAL

11 12

FM DET. COIL L053

17.

18 23

R151

L051 VCO CW COIL

L502 AFT COIL

TP12

R021

Z002

R022

TO SOUN MPX IC

C106

Q004

Q002

Q003

IF AMP GAIN – 14dB

-15dB

S C P

41.25M 45.75M

Z001 SAW

FILTER

F1802R

-6dB

SIF LIMIT FM DET.

14.

SIF DET

AMP

AGC

13 16 20

RF AGC

R051

R018

C053

APC VCD

VIDEO

DET.

LOCK

CONTROL

C022

VIDEO IF BANDWIDTH

1 2

4 5 6

GND IF-IN N.C +B(9V) RF AGC AFC VIDEO OUT ADR SW

Fig. 2-4 IF/MTS/S. PRO circuit diagram

3-1-4. 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 LR 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.

MVUS32S

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 voltage. 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

Monitor the input

pin for multiplex

sound IC

Stereo 0V Other 0V

Fig. 2-5 Block diagram of MVUS32S

Table 2-1 Matrix for broadcasting conditions and reception mode

Output OSD display

Broad- Switching

casted mode

12 pin 14 pin

(R) (L)

Stereo SAP

Stereo STE R L O X

SAP R L O X MONO L+R L+R O X

Mono STE L+R L+R X X

SAP L+R L+R X X MONO L+R L+R X X

Stereo STE R L O O

+ SAP SAP SAP O O

SAP MONO L+R L+R O O

Mono STE L+R L+R X O

+ SAP SAP SAP X O

SAP MONO L+R L+R X O

DAC-out1 DAC-out2

TV TV

(SURR OFF)

R-Out

SAP 0V

Other 0V

TV waveform detection

12 13 14

OFF 0V

ON 9V

Not used for CN32E90.

output (R)

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.

L-Out

TV waveform detection

output (L)

(RFSW)

RF1 0V

RF1 9V

3-1-5. 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. 2-6 shows a block diagram of the A.PRO IC.

Lin

Rin

Cin

Win

SDA

SGL

1272922 32

TONE CONTROL

LPF

Center LEVEL

Woofer LEVEL

I C

56 73124

D/A

CONV

VOLUME

23 22 19

30 9 8 28

BALANCE

I/O

Lout

Rout

Cout

Wout

17 16 15 14 13 12 11

SAP det. STE det.

R-in C-in L-in

From From From A/V Dolby A/V

18 19 20 21 22

SCL SDA W-out O-out L-out R-out

Q670 Q640 Q670 Q670

Via QS101

26 27

Fig. 2-6 A.PRO block diagram

4. PIP TUNER

Lable Name

Lot No.

TUNER

SECTION

RF AGC

SAW

FILTER

AFT

OUTPUT

VIF/SIF

CIRCUIT

VIDEO

OUTPUT

AUDIO

OUTPUT

Fig. 2-7

4-1. Outline

The PIP 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. 2-8 Tuner terminal layout

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 audio signal processing (QN06), IC for V/C/D signal processing (Q501), IC for A/V switching (QV01), IC for non volatile memory (QA02), Main and sub U/V tuners (H001, HY01), IC for deflection distortion correction (Q302), IC for PIP signal processing (QY04), IC for DSP (QM01), IC for closed caption control (Q701).

Differences from N4SS 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

Toshiba made 8 bit microcomputer TLCS-870 series for TV receiver, TMP87CS38N-3152 is employed for QA01. With this microcomputer, each IC and circuit shown below are controlled.

(1) CONTROL OF AUDIO SIGNAL PROCESS IC (QN06

Toshiba TA1217N)

• Adjustments for volume, treble, bass and balance

• Selection between surround mode and DSP mode, and level adjustment

• Level adjustment of BAZOOKA system

• Audio muting during channel selection or no signal reception.

(2) CONTROL OF VIDEO/CHROMA/DEF SIGNAL

PROCESS IC (Q501 Toshiba TA1222N)

• 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 g correction, etc.

• Setting of video parameters of video modes (Standard, Movie, Memory)

(3) CONTROL OF A/V SWITCH IC (QV01 Toshiba

TA1219N)

• Preforms source switching for main screen and sub screen

• Performs source switching for TV and three video inputs

(4) CONTROL OF NON-VOLATILE MEMORY IC

(QA02 Microchip 24LC04BI/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.

(5) CONTROL OF U/V TUNER UNIT (H001 Matsushita

EL466L, 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.

(6) CONTROL OF DEFLECTION DISTORTION

CORRECTION IC (Q302 Toshiba TA8859P)

• Sets adjustment memory value for vertical amplitude, linearity, horizontal amplitude, parabola, corner, trapezoid distortion.

(7) CONTROL OF PIP SIGNAL PROCESS IC (QY04

Toshiba TC9083F)

• Controls ON/OFF and position shift of PIP.

(8) CONTROL OF DIGITAL SOUND PROCESSOR IC

(QM04 Yamaha YSS238-D)

• Performs mode switching of DSP.

(9) CONTROL OF CLOSED CAPTION/EDS (QM01

Motorola XC144144P)

• Controls Closed Caption/EDS.

3. MICROCOMPUTER

SDA

SCL

1 - 7

9 1 - 7

1 - 7

START

CONDITION

STOP CONDITION

ADDRESS

R/W

Ack DATA

Ack

DATA Ack

Approx.180

Some device may have no data, or may have data with several bytes continuing.

Microcomputer TMP87CS38N-3152 has 60k byte of ROM capacity and equipped with OSD function inside. The specification is as follow.

• Type name : TMP87CS38N-3152

• 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, Conversion time 20ms)

• OSD

Character kinds : 256 Character display : 24 characters x 12 lines Character dot : 14 x 18 dots Character size : 3 kinds (Selected by line) Character color : 8 colors (Selected by character) Display position : Horizontal 128 steps, Vertical

256 steps This microcomputer performs functions of AD converter, reception of U/V TV and OSD display in one chip.

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

operation

(4) Detecting function of abnormality in IIC bus

line

(5) Functions of LED blink indication and OSD

indication

(6) Block diagnosis function which uses new VCD

and AV SW

Fig. 3-1

4. MICROCOMPUTER TERMINAL FUNCTION

TMP87CS38N3152 (QA01)

GND

VDD

IIC

-BUS

BAL

REM OUT

MUTE

SP MUTE

POWER

LED

NC NC

SCL0

SDA0

SYNC VCD

NC AFT2 AFT1

KEY-A KEY-B

SGV SGA

GND

10 11

12 13 14 15 16 17 18 19 20 21

P40 (PWM0)

P41 (PWM1)

P42 (PWM2)

P43 (PWM3)

P44 (PWM4)

P45 (PWM5)

P46 (PWM6)

P47 (PWM7)

P50 (PWM8/TC2)

P51 (SCL1)

P52 (SDA1)

P53 (AINO/TC1)

P54 (AIN1)

P55 (AIN2)

P56 (AIN3)

P60 (AIN4)

P61 (AIN5)

P62

P63 VSS

P57 P32 P57

SDA0

SCL0

(TC3)P31

(RXIN)P30

P20

RESET

XOUT

XIN TEST 0SC2 0SC1

Y/BL

I I I I

I I

I O O

41 40 39 38 37 36 35 34 33

32 31 30 29 28 27 26 25 24 23 22

ACP NC GND SDA1 SCL1 SYNC AV1 RMT IN SW IN RESET

XOUT XIN TEST 0SC1 0SC2 VSYNC HSYNC Ys BOUT GOUT ROUT

IIC BUS

Fig. 3-2

<< 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 POWER LNB Out 0V 10 LNB DET In 0V 11 SCL() IIC BUS CLOCK OUT Out IIC bus clock output 0 12 SDA() 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 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 R R Out At display on:Pulse 23 G G Out At dispaly on:Pulse 24 B B Out At dispaly on:Pulse 25 Y/BL BL Out At dispaly on:Pulse 26 HSYNC In HSYNC for OSD display Pulse 27 VSYNC In VSYNC for OSD display 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 SW IN 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 GND 0V 40 NC 41 ACP NSYNC INPUT In AC pulse input 42 VDD POWER — 5V 5V

5. EEPROM (QA02)

EEPROM (Non volatile memory) has function which, in spite of power-off, memorizes the such condition as channel selecting data, last memory status, user control and digital processor data. The capacity of EEPROM is 8k bits. Type name is 24LC04BI/ P or ST24C04CB6, and those are the same in pin allocation and function, and are exchangeable each other. This IC controls through I2C bus. The power supply of EEPROM and MICOM is common. Pin function of EEPROM is shown in Figure 3-3.

EEPROM(QA02)

Device adress

GND

A0 A1 A2

Vss

2 3 4

Fig. 3-3

8 7 6 5

Vcc + 5V NC SCL SDA

C-BUS line

6. ON SCREEN FUNCTION

ON SCREEN FUNCTION indicates data like channel, volume. Formerly, exclusive use of OSD IC was used, but in N5SS, OSD function is involved in microcomputer. Pin function concerning on-screen is shown in figure 3-4. Oscillation clock of OSD is approx. 4.5MHz. 9MHz which becomes twice in microcomputer is dot clock. For oscillation coil, TRF1160D (LA02) is used.

QA01

OSC2 OSC1

Y/BL

OSC2 OSC OUT

OSC1 OSC IN

VSYNC H. SYNC SIGNAL

HSYNC V. SYNC SIGNAL

Ys/Ym HALF TONE SIGNAL

BOUT

24 23

GOUT COLOR SIGNAL

ROUT

Fig. 3-4

7. SYSTEM BLOCK DIAGRAM

TMP87CS38N-3152

QA01

QA02

MEMORY

24LC04B1/P

SDA SCL

5 6

H. SYNC PULSE VSYNC PULSE

VIDEO SIGNAL PROCESS CIRCUIT

REMOTE CONTROL OUTPUT

SOUND MUTE SPEAKER MUTE

Q701

C/C, EDS

XC144144P

DATA CLK

11 12

26 27

22 23 24 25

4 5

SCL 0 SDA 0

HSYNC VSYNC

R G B YS/TM

RMT OUT

MUTE SP MUTE

SDA 1 SCL 1

RMT

KEY-A KEY-B

RST

VDD

GND

VSS

POWER

ACP

LED

XIN

XOUT

OSCI

OSCO

SGV SGA

38 37

17 18

28 29

19 20

33 42

31 32

REMOTE SENSOR

UNIT

KEY SWITCH

POWER SUPPLY CIRCUIT

8MHz CLOCK

6.1MHz CLOCK

SIGNAL OUTPUT

H001

MAIN U/V TUNER

EL446L

SDA SCL

HY01

SUB U/V TUNER

EL922L

SDA SCL

Q501

VCD

TA1222

SDA SCL

27 28

H002

IF/MPX

MVUS345

SDA SCL

21 20

DPC UNIT

DATA CLK

QY04

PIP CONTROL

DATA CLK

6 5

SYNC-AV1

AFT1 IN

SYCN-AV2

AFT2 IN

36 16

Fig. 3-5

MAIN SCREEN

SUB SCREEN

SYNC DET. AFT DET.

QV01

AV SW

TA1219N

SDA SCL

26 27

QM01

DSP

SDA SCL

+ 109 hidden pages

TOSHIBA CN27E90, CN35E15, CN35E95 TECHNICAL TRAINING MANUAL

Contents

SECTION I

OUTLINE

SECTION II

TUNER, IF/MTS/S.PRO MODULE

SECTION III

CHANNEL SELECTION CIRCUIT