Sharp 14EM4RU, Service Manual

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2
2-1
2-2
14EM4RU
21EM4RU
SPECIFICA
TIONS
Convergence
.................................................................
Self Convergence System
Focus
......................................................................
Quadra-Potential Electrostatic
Sweep Deflection
......................................................................................
Magnetic
Intermediate Frequencies Picture IF Carrier
..................................................................................
38.9MHz
Sound IF Carrier Frequency 6.5MHz
..............................................................................................
32.4MHz
6.0MHz
..............................................................................................
32.9MHz
5.5MHz
..............................................................................................
33.4MHz
Colour Sub-Carrier Frequency
............................................................
34.47MHz
Power Input
.....................................................................
220 ~ 240V
AC 50/60 Hz
Power Consumption 14EM4RU
....................................................................................................
58W
21EM4RU
....................................................................................................
75W
Audio Power Output Rating
..............................................................
3.0W(at Max.)
Speaker Size
................................................................................
5 x 9 cm Elliptic (1 pcs)
V
oice Coil Impedance
...........................................................
16 ohms at 400 Hz
Aerial Input Impedance VHF/UHF
..........................................................................
75
ohms
Unbalanced
Receiving
System
....................................................
CCIR SECAM/P
AL
B, G,D,K,I
T
uner Ranges
VHF-Channels
..........................................
E2(48.25MHz)
thru
E12(224.25MHz)
C1(49.75MHz) thru C12(216.25 MHz)
S1(105.25MHz) thru S36(423.25HMz)
UHF-Channels
......................................
E21(471.25MHz) thru E69(855.25MHz)
C13(471.25MHz) thru C57(863.25MHz)
S37(431.25MHz) thru S41(463.25MHz)
Dimensions 14EM4RU
.................................................................................
Width: 351.0mm
Height: 361.0mm
Depth: 359.0mm
W
eight(approx): 9.2 kg
21EM4RU
.................................................................................
Width: 506.0mm
Height: 476.0mm
Depth: 479.0mm
W
eight(approx): 20.1 kg
Cabinet material
....................................................................................
All Plastics
Specifications are subject to change without prior notice.
IMPORT
ANT SER
VICE NOTES
Maintenance and repairing of this receiver should be done by quali- fied service personnel only
.
SER
VICE OF HIGH VOL
T
AGE 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-RA
Y
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.
14EM4RU:
When repairing the circuit, be sure not to increase the high voltage to more than 25.5kV(at beam 0
µ
A) for the set.
21EM4RU:
When repairing the circuit, be sure not to increase the high voltage to more than 28.0kV(at beam 0
µ
A) for the set.
2.
14EM4RU:
T
o
keep the set in a normal operation , be sure to make it function on
22.5kV
±
1.5kV(at beam 800
µ
A) in the case of the set. The set has been fac-
tory -
Adjusted to the above-mentioned high voltage.
21EM4RU:
T
o
keep the set in a normal operation , be sure to make it function on
24.98kV
±
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 repairing, 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.