NEC DTE-29U1TH User manual

Nov. 2003

NEC Corporation

Service manual

68 Cm STEREO Color Television

MODEL : DTE-29U1TH

PF-68T32

CHASSIS : CP-785F

S/M No. : TCP785FEF0

Contents

1 - Main features 2

1-1 Specifications 2

1-2 External Terminals 2

1-3 Channel table 4

2 - Safety instruction 7

3 - Alignment instructions 8

3-1 Microcontroller configuration : Service mode 8

3-2 Microcnotroller configuration : Option 8

3-3 TV set Alignment 10

4 - IC description 12

4-1 TDA936x TV signal processor - TXT with embedded -Controller 12

4-2 MSP341x Multistandard Sound Processor 19

4-3 TDA894x J Stereo Audio Amplifier 23

4-4 TDA835x J Vertical Amplifier 24

4-5 TDA6107JF 26

4-6 24C08 8 K bit EEPROM 27

4-7 STR-F665X 28

5 - Circuit description 30

5-1 Block diagram 30

5-2 IF 34

5-3 Source switching 35

5-4 -Controller I/O pin configuration and function 35

5-5 Sound processing 36

5-6 Sound amplification 37

5-7 Vertical deflection 38

5-8 Power supply (STR-F665X) 39

5-9 TV start-up, TV normal run and stand by mode operations 43

6 - Service parts list 50

6-1 Part List 50

6-2 All Electrical Parts List 51

6-3 Control Assembly Parts Lists 64

6-4 Compaitible Components List 65

7 - Exploded view 66

8 - PCB Layout 67

8-1 Main PCB 67

8-2 AV PCB 68

9 - Circuit Diagram 69

-1--1-

-2-

Service Manual CP-785F

1-1 Specifications

1 - Main Features

1-2 External Teminals

1-2-1 Input 1 : (The Rear Side) RCA

TV standard PAL, - B/G, , NTSC(AV Only)

Sound system NICAM B/G

FM 2Carrier B/G

Power consumption 116W approx.

Sound Output Power 5W x 5W (at 60% mod, 10% T D)

Speaker 7W 8 ohm x 2

Teletext system 10 pages memory FASTEXT (FLOF or TOP) : Option

Aerial input 75 ohm unbalanced

Channel coverage Off-air channels, S-cable channels and hyperband

Tuning system frequency synthesiser tuning system

Visual screen size 68 Cm

Channel indicatio On Screen Display

Program Selection 100 programmes

Aux. terminal INPUT1(RCA) : Audio / Video In.

INPUT2(RCA) : Audio / Video In

OUTPUT(RCA) : MONITOR OUT

DVD:Y/Cr/Cb/Audio in

eadphone jack (3.5 mm) on the right front of cabinet

Remote Control Unit R-44N08(RD-D90) for with Teletext

Pin Signal Matching value

1(Yellow) Video Input 1.0 Vpp+/- 3dB, Impedance 75 ohm

2(White) Audio Input Left 0.5 Vrms, Impedance > 10k ohm

3(Red) Audio Input Right 0.5 Vrms, Impedance > 10k ohm

1-2-2 Input2 : (The right Side) RCA

Pin Signal Matching value

1(Yellow) Video Input 1.0 Vpp+/- 3dB, Impedance 75 ohm

2(White) Audio Input Left 0.5 Vrms, Impedance > 10k ohm

3(Red) Audio Input Right 0.5 Vrms, Impedance > 10k ohm

-2-

-3-

Service Manual CP-785F

1-2-3 MONITOR OUTPUT & DVD INPUT(THE REAR SIDE)

Pin Signal Matching value

2 DVD Cb-in 0.7Vpp +/- 3dB, Impedence 75ohm

3 DVD Cr-in 0.7Vpp +/- 3dB, Impedence 75ohm

4 DVD Y-in 1Vpp +/- 3dB, Impedence 75ohm

5 DVD Audio Left 0.5 Vrms, Impedance > 10 kohm

6 DVD Audio Right 0.5 Vrms, Impedance > 10 kohm

7 Monitor Video-out 1Vpp +/- 3dB, Impedence 75ohm

8 Monitor Audio Left-out 0.5Vrms at RF sound FM 54% Mod(27Khz dev)

9 Monitor Audio Right-out 0.5Vrms at RF sound FM 54% Mod(27Khz dev)

VIDEO

DVD-Y

(MONO)

OUT DVD IN

OCr

-4-

Service Manual CP-785F

1-3 Channel table

FREQUENCY TABLE CP-785F

CH AUSTRALIA N/Z land

C00 46.25

C01 57.25

C02 64.25

C03 86.25

C04 95.25

C05 102.25

C5A 138.25

C06 175.25

C07 182.25

C08 189.25

C09 196.25

C10 209.25

C11 216.75

N01 - 45.25

N02 - 55.25

N03 - 62.25

N08 - 203.25

N09 - 210.25

N10 - 217.25

-- -

C21 471.25

C22 479.25

C23 487.25

C24 495.25

C25 503.25

C26 511.25

C27 519.25

C28 527.25

C29 534.25

C30 541.25

C31 548.25

C32 555.25

C33 562.25

C34 569.25

C35 576.25

C36 583.25

C37 590.25

C38 597.25

C39 603.25

C40 610.25

C41 617.25

C42 624.25

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Service Manual CP-785F

CH AUSTRALIA N/Z land

C43 631.25

C44 638.25

C45 645.25

C46 652.25

C47 659.25

C48 666.25

C49 673.25

C50 680.25

C51 687.25

C52 694.25

C53 701.25

C54 708.25

C55 715.25

C56 722.25

C57 729.25

C58 736.25

C59 743.25

C60 750.25

C61 757.25

C62 764.25

C63 771.25

C64 779.25

C65 786.25

C66 793.25

C67 800.25

C68 807.25

C69 814.25

C70 -

C71 -

C72 -

C73 -

C74 -

C75 -

C76 -

C77 -

S01 105.25

S02 112.25

S03 119.25

S04 126.25

S05 133.25

S06 140.25

S07 147.25

S08 154.25

S09 161.25

S10 168.25

S11 231.25

-6-

Service Manual CP-785F

CH AUSTRALIA N/Z land

S12 238.25

S13 245.25

S14 252.25

S15 259.25

S16 266.25

S17 273.25

S18 280.25

S19 287.25

S20 294.25

S21 303.25

S22 311.25

S23 319.25

S24 327.25

S25 335.25

S26 343.25

S27 351.25

S28 359.25

S29 367.25

S30 375.25

S31 383.25

S32 391.25

S33 399.25

S34 407.25

S35 415.25

S36 423.25

S37 431.25

S38 439.25

S39 447.25

S40 455.25

S41 463.25

-7-

Service Manual CP-785F

2 - Safety instruction

WARNING: Only competent service personnel may carry out work involving the testing or repair

of this equipment.

X-RAY RADIATION PRECAUTION

1. Excessive high voltage can produce potentially hazardous X-RAY RADIATION. To avoid

such hazards, the high voltage must not exceed the specified limit. The nominal value of the

high voltage of this receiver is 28~30 KV at max beam current. The high voltage must not

under any circumstances, exceed 32 KV. Each time a receiver requires servicing, the high

voltage should be checked. It is important to use an accurate and reliable high voltage meter.

2.The only source of X-ray Radiation in this TV receiver is the picture tube. For continued X-ray

RADIATION protection, the replacement tube must be exactly the same type tube as

specified in the parts list.

SAFETY PRECAUTION

1. Potentials of high voltage are present when this receiver is operating. Operation of the

receiver outside the cabinet or with the back board removed involves a shock hazard from the

receiver.

1) Servicing should not be attempted by anyone who is not thoroughly familiar with the

precautions necessary when working on high voltage equipment.

2) Discharge the high potential of the picture tube before handling the tube. The picture tube is

highly evacuated and if broken, glass fragments will be violently expelled.

2. If any Fuse in this TV receiver is blown, replace it with the FUSE specified in the

Replacement Parts List.

3. When replacing a high wattage resistor (oxide metal film resistor) in circuit board, keep the

resistor 10 mm away from circuit board.

4. Keep wires away from high voltage or high temperature components.

5. This receiver must operate under AC 240 volts, 5O Hz. NEVER connect to DC supply or any

other power or frequency.

PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this equipment have special safety-related

characteristics. These characteristics are often passed unnoticed by a visual inspection and the

X-ray Radiation protection afforded by them cannot necessarily be obtained by using

replacement components rated for higher voltage, wattage, etc. Replacement parts which have

these special safety characteristics are identified in this manual and its supplements, electrical

components having such features are identified by designated symbol on the parts list. Before

replacing any of these components, read the parts list in this manual carefully. The use of

substitutes replacement parts which do not have the same safety characteristics as specified in

the parts list may create X-ray Radiation.

-8-

Service Manual CP-785F

3 - Alignment instructions

3-1 Microcontroller configuration : Service mode

To switch the TV set into service mode please see instruction below.

1 - Select pr. number 91

2 - Adjust sharpness to minimum value and exit all menu.

3 - Quickly press the key sequence : RED - GREEN - menu

To exit SERVICE menu press menu key or Operate(Std By) key.

In Service Mode press OK to stop the microcontroller i.e. the I2C bus is free and the set can be

controlled by external equipment. Press OK again to allow the microcontroller to control the set again.

Section ITEMS BARE DTE-29U1TH REMARK

DATA (PF-68T32)

For AGC 32 23 Variable

Adjustment BIAS R/G 31/31 31/31 Variable/Variable

(Variable) DRIVE R/G/B 32/32/32 32/32/32 Variable/Variable/FIX

H-PARALLEL 31 26 FIX

H-BOW 42 34 FIX

H-SHIFT 25 33 Variable

V-SLOPE 32 31 Variable

V-Amplitude 39 20 Variable

V. S-Correction 13 29 FIX

V SHIFT 32 30 Variable

H-WIDTH 32 42 Variable

EW Parabola 32 23 Variable

Up-Conner 32 32 Variable

Dn-Conner 32 32 Variable

EW Trapezium 32 29 Variable

For Option 04 04 FIX (Tuner option Code)

Function (HOTEL)CH LOCK OFF Off

Change (HOTEL) Max Vol 15 43

(OPTION) Clock Pr. 01 07

SVHS ON 0FF

AV START OFF OFF

KEY LOCK OFF OFF

SCREEN 24 30

DVD IN OFF ON

AUTO OFF OFF ON

3-2 Microcontroller configuration : Option

-9-

Service Manual CP-785A

Option Function

* Note : These Function is changed only Service Mode not Factory mode. So you must use the user s remote controller

- Change the PR. No. to 91 ==> change the sharpness to 00(min) in Picture control Menu ==> Exit the User control Menu ==> Press the

[RED],[GREEN],[MENU] quickly

- Then the Service Menu is appeared.

FUNCTION Description Remark

Option - This is the tuner option code. 0,1,2,3 :For D/W Remote controller

4,5,6,7 :For NEC Remote controller

CH LOCK ON/OFF - Channel Setting : Impossible/possible

- When this function is active, It is impossible to change

the channel data(can not enter the INSTALL menu)

Max Vol 00~43(max) - this is the limited Volume function.

- it is variable to 43(max) from 00(min).

Clock Pr. - it change the reference channel for Automatic clock setting.

SVHS ON/OFF - When SVHS is active, The AV mode is changed to SVHS mode. CP-785F can t operate the S-VHS.

It operate to the CP-785A(DTE-29/25G5TH)

AV START ON/OFF - When AV start is active, the set always start in av1 mode

(main AC switch on/off & remote controller on/off)

- In case if virgin EEPROM, the default setting is OFF.

KEY LOCK ON/OFF - When active the local keyboard can t be used.

- In case if virgin EEPROM, the default setting is OFF.

SCREEN - It is adjust screen point.

- It requires for screen adjustment at the manufacture.

DVD IN ON/OFF - When DVD IN is active, The AV mode is changed to DVD mode.

AUTO OFF ON/OFF - When AUTO OFF is active, If broadcasting signal is not present.

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