Erisson 21F4 Schematics

SERVICE MANUAL

21P8MDY5-A02 21T8MDY5-A01

I. Safety Instructions.........................................................................................................................2

II. Specifications..............................................................................................................................4

III. Level List of Equipments & Instruments Required for Production.................................................6

IV.Wiring Diagram...........................................................................................................................7

V. Block Diagram............................................................................................................................8

VI.Disassembly...............................................................................................................................9

VII. Input Signals & Equipments List for Alignment...........................................................................9

VIII. EEPROM Setting....................................................................................................................10

IX. Electrical Adjustment...............................................................................................................17

X. Transistor and IC Identification..................................................................................................18

XI. Schematic Diagram.................................................................................................................19

XII. Component Diagrams.............................................................................................................20

XIII. Exploded View Diagram.........................................................................................................24

This manual is the latest at the time of printing, and does not include the modification which may be made after the printing, by the constant improvement of product.

I. Safety Instructions

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.

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

PRECAUTIONS DURING SERVICING

1. In addition to safety, other parts and assemblies are specified for conformance with such regulations as those applying to spurious radiation. These must also be replaced only with specified replacements. Examples: RF converters, tuner units, antenna selection switches, RF cables, noise-blocking capacitors, noise-blocking filters, etc.

2. Use specified internal Wiring. Note especially:

1) Wires covered with PVC tubing

2) Double insulated wires

3) High voltage leads

3. Use specified insulating materials for hazardous live parts. Note especially:

1) Insulating Tape

2) PVC tubing

3) Spacers (insulating barriers)

4) Insulating sheets for transistors

5) Plastic screws for fixing micro switches

4. When replacing AC primary side components (transformers, power cords, noise blocking capacitors, etc.), wrap ends of wires securely about the terminals before soldering.

5. Make sure that wires do not contact heat generating parts (heat sinks, oxide metal film resistors, fusible resistors, etc.)

6. Check if replaced wires do not contact sharply edged or pointed parts.

7. Make sure that foreign objects (screws, solder droplets, etc.) do not remain inside the set.

MAKE YOUR CONTRIBUTION TO PROTECT THE ENVIRONMENT

Used batteries with the ISO symbol for recycling as well as small accumulators (rechargeable batteries), mini-batteries (cells) and starter batteries should not be thrown into the garbage can. Please leave them at an appropriate depot.

The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.

WARNING:

Before servicing this TV receiver, read the X-RAY RADIATION PRECAUTION, SAFETY INSTRUCTION and PRODUCT SAFETY NOTICE.

X-RAY RADIATION PRECAUTION

1. Excessively high can produce potentially hazardous X-RAY RADIATION. To avoid such hazards, the high voltage must not exceed the specified limit. The normal value of the high voltage of this TV receiver is 27 KV at zero bean current (minimum brightness). The high voltage must not exceed 30 KV under any circumstances. Each time when a receiver requires servicing, the high voltage should be checked. The reading of the high voltage is recommended to be recorded as a part of the service record, It is important to use an accurate and reliable high voltage meter.

2. The only source of X-RAY RADIATION in this TV receiver is the picture tube. For continued X-RAY RADIATION protection, the replacement tube must be exactly the same type as specified in the parts list.

3. Some parts in this TV receiver have special safety related characteristics for X-RADIATION protection. For continued safety, the parts replacement should be under taken only after referring the PRODUCT SAFETY NOTICE.

SAFETY INSTRUCTION

The service should not be attempted by anyone unfamiliar with the necessary instructions on this TV receiver. The following are the necessary instructions to be observed before servicing.

1. An isolation transformer should be connected in the power line between the receiver and the AC line when a service is performed on the primary of the converter transformer of the set.

2. Comply with all caution and safety related provided on the back of the cabinet, inside the cabinet, on the chassis or picture tube.

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3. To avoid a shock hazard, always discharge the picture tube's anode to the chassis ground before removing the anode cap.

4. Completely discharge the high potential voltage of the picture tube before handling. The picture tube is a vacuum and if broken, the glass will explode.

5. When replacing a MAIN PCB in the cabinet, always be certain that all protective are installed properly such as control knobs, adjustment covers or shields, barriers, isolation resistor networks etc.

6. When servicing is required, observe the original lead dressing. Extra precaution should be given to assure correct lead dressing in the high voltage area.

7. Keep wires away from high voltage or high tempera ture components.

8. Before returning the set to the customer, always perform an AC leakage current check on the exposed metallic parts of the cabinet, such as antennas, terminals, screwheads, metal overlay, control shafts, etc., to be sure the set is safe to operate without danger of electrical shock. Plug the AC line cord directly to the AC outlet (do not use a line isolation transformer during this check). Use an AC voltmeter having 5K ohms volt sensitivity or more in the following manner. Connect a 1.5K ohm 10 watt resistor paralleled by a

0.15µF AC type capacitor, between a good earth ground (water pipe, conductor etc.,) and the exposed metallic parts, one at a time. Measure the AC voltage across the combination of the 1.5K ohm resistor and 0.15 uF capacitor. Reverse the AC plug at the AC outlet and repeat the AC voltage measurements for each exposed metallic part. The measured voltage must not exceed 0.3V RMS. This corresponds to 0.5mA AC. Any value exceeding this limit constitutes a potential shock hazard and must be corrected immediately. The resistance measurement should be done between accessible exposed metal parts and power cord plug prongs with the power switch "ON". The resistance should be more than 6M ohms.

PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this TV receiver have special safety-related characteristics. These characteristics are offer passed unnoticed by visual spection and the protection afforded by them cannot necessarily be obtained by using replacement components rates for a higher voltage, wattage, etc. The replacement parts which have these special safety characteristics are identified by marks on the schematic diagram and on the parts list. Before replacing any of these components, read the parts list in this manual carefully. The use of substitute replacement parts which do not have the same safety characteristics as specified in the parts list may create shock, fire, X-RAY RADIATION or other hazards.

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

AC Leakage Current Check

AC VOLTMETER

Place this probe on each exposed metallic part

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II. Specifications

1. Power supply TV: AC 220-240V, 50/60Hz

Remote control battery: 3V (UM-4X2)

2. TV system RF input: PAL BG/DK/I, SECAM BG/DK, NTSC M /N

Video input: PAL/NTSC 3.58/NTSC 4.43/SECAM

3. Receiving channels 48.25MHz~588.25MHz

4. Intermediate frequencies Picture: 38.9MHz

5. Scanning Horizontal (Hz): 15625/15750

Vertical (Hz) : 50/60

6. Color picture tube : 21" 90 degree N(3) hemisphere Bv=0.5G(+0.1G/-0.15G)

7. Operating temperature Fulfil all specifications: 15°C ~ 35°C

Accept picture/tone reproduction: 5°C ~ 45°C

8. Operating relative humidity Fulfil all specifications: 45% ~ 75%

Accept picture/tone reproduction: 15% ~ 90%

9. Electrical & Optical Specification:

No. Items Instruction Typical Limit Unit

1 Video sensitivity For 30dB S/N ≤45 ≤51 dBuV 2 FM sound sensitivity For 30dB S/N 30 ≤35 dBuV 3 Synchronizing sensitivity For RF transmission 30 ≤35 dBuV 4 Color sensitivity For RF transmission 32 ≤40 dBuV 5 Teletext sensitivity TV screen refreshes 40 times N/A N/A dBu

number of mistakes ≤8

6 Minimum NICAM threshold Without crackline noise N/A N/A dBu 7 AGC static characteristic Accept. Picture/tone repr. 103 ≥100 dBu 8 Selectivity Adjacent sound carrier 35 ≥30

Below adjacent sound carrier 35 ≥30 dB Adjacent picture carrier 50 ≥40

Up adjacent picture carrier 45 ≥30 9 IF rejection 55 ≥50 dB 10 Image rejection VHF 55 ≥50 dB

UHF 50 ≥45 11 AFT pull-in range M/N ±1.0 ≥|±0.5| MHz

DK/I/BG +1.5 ≥|±1.0|

-1.0 ≥|±-0.75| 12 Chroma sync pull-in range ±500 ≥|±200| Hz 13 Color killer function -25 ≤-16 dB 14 DC restoration 3 ≤10 % 15 Resolution Horizontal PAL/SECAM 320 ≥300

NTSC 270 ≥250

Vertical PAL/SECAM 410 ≥400 lines

NTSC 320 ≥300

16 Overscan Cross hatch signal 93 91~97 % 17 Linearity Horizontal 7 ≤10 %

Vertical 6 ≤8 % 18 Pattern distortion 1.5 ≤3 % 19 Picture position In all direction ±3 ≤|±6| mm 20 Raster rotation In all direction 4 ≤6 mm 21 Convergence error 0.4 ≤0.6 %

22 White balance (8700°K) X 0.288 0.288±0.015

Y 0.298 0.298±0.015 / 23 Maximum full white At picture tube center 140 ≥100 cd/m 24 H sync pull-in range ±500 ≥|±200| Hz 25 V sync pull-in range 7 ≥6 Hz 26 Anode voltage 26.5 ≤27.5 KV

27 Audio frequence response ±3dB ref. to 1KHz 0.1~8.2 0.18~7.1 KHz

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No. Items Instruction Typical Limit Unit

28 Audio output power 1KHz 10% THD N/A N/A W

50KHz DEV. (BG/DK/I)

25KHz DEV. (M/N) 29 THD Po=0.5W 1KHz 1 ≤3 % 30 Signal to buzz ratio TV/AV 42 ≥40 dB 31 Minimum volume hum 6 ≤10 mVrms 32 Maximum woofer output power N/A N/A W

33 Woofer audio freqency response ±3dB ref. to 80Hz AV mode N/A N/A Hz 34 Bass control range 100Hz ref. to 1KHz AV mode N/A N/A dB

35 Treble control range 10KHz ref. to 1KHz AV mode N/A N/A dB 36 Balance Center 0 ≥|±2| dB

Max. 3 >2 dB

Min. -35 <−30 dB 37 Video input level 1.0 1±0.2 Vpp

38 Audio input level 0.5 0.5±0.3 Vrms

39 Video output level 1.0 1±0.2 Vpp 40 Audio output level 0.5 0.5±0.3 Vrms 41 Power consumpution Operating 75 ≤80 W

Stand by 6 ≤10 W 42 IR receiving distance ±30° 6 ≥4 m 43 X-ray radiation <0.1 ≤0.5 mR/h 44 Dielectric strength AC 3KVrms 1min. 3 ≤5 mArms

45 Y input level N/A N/A Vpp 46 Cr input level N/A N/A Vpp

47 Cb input level N/A N/A Vpp 48 White uniformity L edge or angle/L center 47 ≥45 %

49 Cross modulation Receiving Kawa central No visible interference at 80dBuv

interference system signals

50 The vibration noise from The distance between the No obvious vibration noise can be heard

electromagnetic devices in tester and the TV set is four TV set times as many as the screen height

Test Condition

1 Picture Modulation 87.5%

2 Sound Modulation 27KHz Dev. For DK/I/BG

15KHz Dev. For M/N

3 Picture to Sound Ration 10dB

4 Sound Artificial Load Resistor 16 ohm 5 Video signal White and black

(three white & two black) 6 Audio signal 1KHz sine wave 0.5Vrms Convergence error test point on screen

7 Conditions of the TV setting:

A.Switch TV on and let it warm up for more than 30 minutes.

B.Connect RMS volt meter to speaker terminals and adjust theTV volume to get 500mW RMS power at each terminal. C.Place the MINOLTA CA-100 test probe to white part of the screen,adjust the contrast until a reading of 80cd/m

D.Place the MINOLTA CA-100 test probe to black part of the screen,adjust the brightness until a reading of 2cd/m E.Repeat step C & D until the exact luminance values is obtained or the nearest possible values you can get.then record the

luminance values & R.G.B gun voltage values at the same time. and take the largest values for measurement referenct.

F.Input standard color bar(100/0/75/0),then adjust the colour.until the waveforms at the blue gun of same level is obtained.

+P8 P5+

+P1

+P4 P2++P0

+P7 P6+

+P3

1/9H

1/9W

is obtained.

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III. Level List of Equipments & Instruments Required for Production

No. Designation Requirement Reference Model Remark

1 Pattern Generator System of output signal: PHILIPS

PAL DK/I., NTSC 3.58/4.43 PM5518-TN/ PM5418-TN 2 Digital voltmeter Input Resistance 10M FLUKE 45 3 Withstanding Withstanding Voltage:AC 1.5KV, KIKUSUI TOS 8650 For Irresistible Voltage

Voltage Tester 5KV/0-5KV±3% measurement

Cut-off current:AC 0-2mA,20mA/

Continuously Adjustable 4 Insulation Tester Test voltage:1000V. 500V KIKUSUI TOS 7100L 5 Oscilloscope Max Frequency of input signal:

20MHz or above 6 CRT Color MINOLTA CA-100 For White Balance

Analyzer Adjustment

7 Oscillator Frequency range of output KENWOOD AG-203A For generating Audio Signal

signal: 20Hz-20kHz 8 HV Probe FLUKE For screen voltage

adjustment

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IV. Wiring Diagram

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V. Block Diagram

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