ERISSON 21F1 - User Manual

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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 se-

lection switches, RF cables, noise-blocking capaci-

tors, 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 (trans-

formers, power cords, noise blocking capacitors,

etc.), wrap ends of wires securely about the termi-

nals 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

save them at an appropriate depot.

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 26.5 kV at zero beam 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.

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.

I. Safety Instructions

Main Page

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Do you have a question about the ERISSON 21F1 and is the answer not in the manual?

This document provides comprehensive information regarding the servicing, specifications, and maintenance of a TV receiver, likely a CRT-based model given the references to picture tubes and X-ray radiation.

Function Description

The TV receiver is designed for standard television broadcasting reception and display. It supports multiple TV systems including PAL BG/DK, SECAM BG/DK, PAL/SECAM/NTSC 3.58/NTSC 4.43 for video input, and various VHF-L, VHF-H, and UHF receiving channels. It features audio and video input/output capabilities, a headphone output, and a remote control for user interaction. The device incorporates specialized safety features, particularly concerning X-ray radiation, and includes mechanisms for automatic white balance adjustment and various picture controls.

Important Technical Specifications

Power Supply:

TV: AC 240V, 50Hz
Remote controller BATTERY: 3V (UM-3X2)

RF Input:

PAL BG/DK, SECAM BG/DK
Video input: PAL/SECAM/NTSC 3.58/NTSC 4.43

Receiving Channels:

VHF-L: E2-S10
VHF-H: E5-S41
UHF: E21-E69

Intermediate Frequencies:

Picture: 38.9MHz

Scanning:

Horizontal (Hz): 15625/15750
Vertical (Hz): 50/60

Sockets:

Aerial input: 75 ohm unbalanced DIN jack
2AV input/1AV out: RCA sockets
Headphone output: 3.5mm stereo jack

Color Picture Tube:

North(2) hemisphere Bv=+0.2G ± 0.2G

Speaker:

2" 5" 16 ohm 3W, 2 pcs

Operating Temperature:

Fulfil all specifications: 15°C ~ 35°C
Accept picture/sound reproduction: 5°C ~ 45°C

Operating Relative Humidity:

Fulfil all specifications: 45% ~ 75%
Accept picture/sound reproduction: 15% ~ 90%

Electrical & Optical Specifications (Selected):

Video sensitivity (For 30dB S/N): ≤48 dBuV (VL, VH), ≤51 dBuV (U)
FM sound sensitivity (For 30dB S/N): ≤35 dBuV
Synchronizing sensitivity (For RF transmission): ≤30 dBuV
Color sensitivity (For RF transmission): ≤40 dBuV
AGC static characteristic: ≥100 dBuV
Selectivity (Adjacent sound carrier): ≥35 dB
IF rejection: ≥50 dB
Image rejection: ≥50 dB (VHF), ≥45 dB (UHF)
AFT pull-in range: ≥±1.0 MHz
Chroma sync pull-in range: ≥±200 Hz
Color killer function: <-16 dB
Resolution (Horizontal): ≥300 (PAL/SECAM), ≥250 (NTSC)
Resolution (Vertical): ≥400 (PAL/SECAM), ≥300 (NTSC)
Overscan (Cross hatch signal): 90~96 %
Linearity (Horizontal): ≤10 %, (Vertical): ≤8 %
Pattern distortion: ≤3 %
Picture position (In all direction): ≤ ±6 mm
Raster rotation: ≤6 mm
Convergence error: ≤0.6 %
White balance (8700°K): X=0.288±0.015, Y=0.298±0.015
Maximum full white (At picture tube center): ≥100 cd/m²
H sync pull-in range: ≥±200 Hz
V sync pull-in range: ≥6 Hz
Anode voltage: <27.5 KV (Normal 26.5 kV at zero beam current)
Audio frequency response (±3dB ref. to 1KHz): 0.2~8 KHz
Audio output power (1KHz 10% THD): ≥2×1.6 W
Max audio output power (1KHz THD ≥20%): ≥2x2 W
THD (Po=0.5W 1KHz): ≤3 %
Signal to buzz ratio: ≥40 dB
Minimum volume hum: ≤10 mVrms
Video input level: 1±0.2 Vpp
Audio input level: 0.5±0.3 Vrms
Video output level: 1±0.2 Vpp
Audio output level: 0.5±0.2 Vrms
Power consumption (Operating): <95 W, (Stand by): ≤15 W
IR receiving distance (±30°): ≥5 m
X-ray radiation: ≤0.5 mR/h
Dielectric strength (AC 3KVrms 2 sec.): ≤5 mArms

Usage Features

The TV receiver is designed for ease of use with a remote control handset. It includes standard audio and video inputs for connecting external devices. The device supports various picture and sound adjustments through a service menu, allowing for fine-tuning of display and audio characteristics. The X-ray radiation precaution highlights a critical safety aspect, emphasizing that the high voltage must not exceed 30 kV and should be checked during servicing. The replacement picture tube must be of the exact specified type to maintain X-ray radiation protection.

Maintenance Features

Safety Precautions During Servicing:

Replacement parts for safety and spurious radiation conformance must be specified.
Specified internal wiring (PVC tubing, double insulated, high voltage leads) and insulating materials (tape, tubing, spacers, sheets, plastic screws) must be used.
Wire ends for AC primary side components should be securely wrapped before soldering.
Wires must not contact heat-generating or sharply edged parts.
Foreign objects (screws, solder droplets) must not remain inside the set.

X-Ray Radiation Precaution:

High voltage must not exceed 30 kV; normal is 26.5 kV at zero beam current.
High voltage should be checked and recorded during servicing.
Picture tube replacement must be with the exact specified type for continued X-ray radiation protection.
Safety-related parts for X-radiation protection require reference to the PRODUCT SAFETY NOTICE for replacement.

Safety Instruction:

Servicing should only be attempted by individuals familiar with the instructions.
An isolation transformer should be used when servicing the primary of the converter transformer.
All caution and safety labels on the cabinet, chassis, or picture tube must be observed.
The picture tube's anode must be discharged to chassis ground before removing the anode cap.
High potential voltage of the picture tube must be completely discharged before handling to prevent explosion if broken.
When replacing the MAIN PCB, all protective components (knobs, covers, shields, barriers, isolation resistor networks) must be properly installed.
Original lead dressing, especially in high voltage areas, must be observed during servicing.

AC Leakage Current Check:

Before returning the set to the customer, an AC leakage current check must be performed on exposed metallic parts.
Connect a 1.5K ohm 10 watt resistor paralleled by a 0.15µF AC type capacitor between a good earth ground and exposed metallic parts.
Measure AC voltage across this combination; it must not exceed 0.3V RMS (0.5mA AC).
Reverse the AC plug and repeat measurements.
Resistance between accessible exposed metal parts and power cord plug prongs (with power switch "ON") should be more than 6M ohms.

Product Safety Notice:

Many electrical and mechanical parts have special safety-related characteristics, identified by marks on schematic diagrams and parts lists.
Replacement parts must be specified in the parts list to avoid shock, fire, X-RAY RADIATION, or other hazards.

Disassembly:

Removal of the Back Cover: Remove screws, slide out TV chassis, remove anode cap (discharge picture tube), pull out two lead wires, and remove the TV chassis.

Alignment Instructions:

Before Adjustment and Maintenance: Isolation transformer, caution and safety labels, discharge picture tube, proper installation of protective components, original lead dressing.
Equipment for Adjustment: Pattern generator, high voltage meter, demagnetizer, DC regulated power supply, CRT colour analyzer (MINOLTA CA-100), digital voltmeter, sine wave signal generator, personal computer (486), oscilloscope.
Input Signals: PHILIPS pattern, cross hatch, monoscope pattern, color bar, grey scale bar, moving picture with sound.
EEPROM (IC602) Setting: Option code selection for different TV systems, features, and functions. Data setting for initialization of EEPROM parameters. Intelligent picture control (I.P.C) data setting for brightness, contrast, color, sharpness, and tint.
AFT Data Setting: Values for VHFL, VHFH, UHF bands.
Electrical Adjustment:
- +B voltage alignment: Adjust VR901 to achieve +B±0.3V.
- Service Menu Access: Press Volume "+" and "-" simultaneously for over 5S.
- AFC Adjustment: Adjust "AFT ADJ" DATA until meter indicates 2.4±0.1V. Confirm DC voltage across R603 when changing RF output frequency by ±0.1MHz (1.2±0.5V for IF+0.1MHz, 3.3±0.5V for IF-0.1MHz).
- H and V position, V-height, V linearity adjustment using PAL and NTSC pattern signals.
- TV TINT and AV TINT adjustment using NTSC color bar signal.
- SECAM BL adjustment using SECAM dot pattern signal.
- RF AGC adjustment using RF signal.
- Sub-brightness adjustment using MONOSCOPE Pattern.
- FOCUS adjustment using knob on FBT.
- Adjustment with computer using UBM software for white balance and other parameters.
Colour Purity, Convergence Adjustment and +B Voltage Check:
- Colour Purity Adjustment: Place TV facing NORTH or SOUTH, operate for 30 minutes, degauss, adjust static convergence, loosen deflection yoke, set C-R, C-G, C-B to "00", adjust purity magnets, push deflection yoke, tighten clamp screw. Re-adjust white balance.
- Convergence Adjustment: Receive dotted pattern, align red/blue dots, align red/blue with green dots, fix convergence magnets, tilt deflection yoke for overall convergence.
- +B Voltage Check: After production aging, connect digital voltmeter between C919 and GND; read-out should be +B±1V. Adjust VR901 if not satisfactory.

Used Batteries Recycling:

Used batteries with the ISO symbol for recycling, as well as small accumulators, mini-batteries, and starter batteries, should not be thrown in the garbage can. They should be saved and disposed of at an appropriate depot.

ERISSON 21F1 Specifications

General

Brand	ERISSON
Model	21F1
Category	TV
Language	English