Sharp 21YF30, Руководство по обслуживанию

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2-1 2-2
21YF30
2
SPECIFICATIONS
Convergence ................................................................. Self Convergence System
Focus ............................................................ Electrostatic Focus High Bi-Potential
Sweep Deflection ...................................................................................... Magnetic
Intermediate Frequencies
Picture IF Carrier .................................................................................. 38.9MHz
Sound IF Carrier Frequency
5.74MHz .......................................................................................... 33.16MHz
5.5MHz .............................................................................................. 33.4MHz
Colour Sub-Carrier Frequency ........................................................... 34.47MHz
Power Input ..................................................................... AC110 ~ 240V, 50/60 Hz
Power Consumption ........................................................................................ 99W
Audio Power Output Rating ............................................................... 4.0W(rms)X2
Speaker
Size .................................................................................... 5 x 9 cm Eliptic (2pc)
Voice Coil Impedance ........................................................... 16 ohms at 400 Hz
Aerial Input Impedance
VHF/UHF .......................................................................... 75 ohms Unbalanced
Receiving Channels (PAL B/G)
VHF-Channels ....................................... E2(48.25MHz) thru E12(224.25MHz)
UHF-Channels ................................... E21(471.25MHz) thru E69(855.25MHz)
Receiving Frequency
VHF-Channels .............................................................. 48.25 thru 463.25MHz
UHF-Channels ............................................................ 471.25 thru 863.25MHz
Dimensions ..................................................................................... Width: 502 mm
Height: 486 mm
Depth: 482 mm
Weight(approx): 22 kg
Cabinet material .................................................................................... All Plastics
Specifications are subject to change without prior notice.
IMPORTANT SERVICE NOTES
Maintenance and repair of this receiver should be done by qualified
service personnel only.
SERVICE OF HIGH VOLTAGE SYSTEM AND PIC-
TURE TUBE
When servicing the high voltage system, remove static charge from it by
Connecting a 10K ohm Resistor in series with an insulated wire(such as a
test probe) between picture tube dag and 2nd anode lead. (AC line cord
should be disconnected from AC outlet.)
1. Picture tube in this receiver employs integral implosion protection.
2. Replace with tube of the same type number for continued safety.
3. Do not lift picture tube by the neck.
4. Handle the picture tube only when wearing shatterproof goggles and after discharging
the high voltage completely.
X-RAY
This receiver is designed so that any X-Ray radiation is kept to an absolute
Minimum. Since certain malfunctions or servicing may produce potentially
hazardous radiation with prolonged exposure at close range, the following
precautions should be observed:
1. When repairing the circuit, be sure not to increase the high voltage to more than 28.6kV
(at beam 0
µ
A) for the set.
2. To keep the set in a normal operation , be sure to make it function on 27.0kV
±
1.5kV (at
beam 1,100
µ
A) in the case of the set. The set has been factory - Adjusted to the above-
mentioned high voltage.
∴ ∴ ∴ ∴ ∴
If there is a possibility that the high voltage fluctuates as a result of the repairs,
never forget to check for such high voltage after the work.
3. Do not substitute a picture tube with unauthorizerd types and/or brands which may
cause excess X-ray radiation.
BEFORE RETURNING THE RECEIVER
Before returning the receiver to the user, perform the following safety Checks.
1. Inspect all lead dress to make certain that leads are not pinched or that hardware is not
lodged between the chassis and other metal parts in the receiver.
2. Inspect all protective devices such as non-metallic control knobs, insulating fishpapers,
cabinet backs, adjustment and compartment covers or shields, isolation resistor- ca-
pacity networks, mechanical insulators etc.