Philips L9.2A, Руководство по обслуживанию

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Safety instructions, maintenance instruction, warnings and Notes
GB 3 L9.2A 2.
1.4 PCB location drawing
2. Safety instructions, maintenance instruction, warnings and Notes
2.1 Safety instructions for repairs
h? ? ? ? ? ? ? ? ? h? ? ? ? ? ? ? ? ? h? ? ? ? ? ? ? ? ? h? ? ? ? ? ? ? ? ?
1. Safety regulations require that during a repair:
–
The set should be connected to the mains via an
isolating transformer;
– Safety components, indicated by the symbol
h
,
should be replaced by components identical to the
original ones;
– When replacing the CRT, safety goggles must be
worn.
2. Safety regulations require that after a repair the set must
be returned in its original condition. In particular attention
should be paid to the following points.
–
As a strict precaution, we advise you to resolder the
solder joints through which the horizontal deflection
current is flowing, in particular ('general repair
instruction'):
•
All pins of the line output transformer (LOT);
• Fly-back capacitor(s);
• S-correction capacitor(s);
• Line output transistor;
• Pins of the connector with wires to the deflection
coil;
• Other components through which the deflection
current flows.
• Note:
• This resoldering is advised to prevent bad
connections due to metal fatigue in solder joints
and is therefore only necessary for television sets
older than 2 years.
– The wire trees and EHT cable should be routed
correctly and fixed with the mounted cable clamps.
– The insulation of the mains lead should be checked for
external damage.
– The mains lead strain relief should be checked for its
function in order to avoid touching the CRT, hot
components or heat sinks.
– The electrical DC resistance between the mains plug
and the secondary side should be checked (only for
sets which have a mains isolated power supply). This
check can be done as follows:
•
Unplug the mains cord and connect a wire
between the two pins of the mains plug;
• Set the mains switch to the "on" position (keep the
mains cord unplugged!);
• Measure the resistance value between the pins of
the mains plug and the metal shielding of the tuner
or the aerial connection on the set. The reading
should be between 4.5 M
Ω
and 12 M
Ω
• Switch off the TV and remove the wire between the
two pins of the mains plug.
– The cabinet should be checked for defects to avoid
touching of any inner parts by the customer.
2.2 Maintenance instruction
It is recommended to have a maintenance inspection carried
out by a qualified service employee. The interval depends on
the usage conditions:
–
When the set is used under normal circumstances, for
example in a living room, the recommended interval is 3 to
5 years.
– When the set is used in circumstances with higher dust,
grease or moisture levels, for example in a kitchen, the
recommended interval is 1 year.
– The maintenance inspection contains the following actions:
•
Execute the above mentioned 'general repair
instruction'.
A1
D1
D2
E
A2
SIDE AV PANEL
POWER SUPPLY
LINE DEFLECTION
FRAME DEFLECTION
SYNCHRONISATION
TUNER VIDEO IF
VIDEO PROCESSING
CONTROL
FRONT CONTROL
SMART SOUND +
MONO SOUND AMPLIFIER
FRONT CINCH +
HEADPHONE
REAR I/O CINCHES
A3
A4
A5
A6
A7
A8
A10
A11
A12
CRT PANEL
B
AUDIO PANEL
MAIN
CL 96532047_014.eps
270599
ITT AUDIO DECODING
ITT AUDIO AMPLIFIER
C1
C2
BTSC DECODER
AUDIO AMPLIFIER
OR