Picture Tube Removal - Sony TRINITRON KV-20FS12 Service Manual

KV-20FS12/20FV12/21FE12/A/C/21FM12/21FV12/C

2-4. PICTURE TUBE REMOVAL

WARNING:
BEFORE REMOVING
THE ANODE CAP
High voltage remains in the CRT
even after the power is disconnected.
To avoid electric shock, discharge
CRT before attempting to remove the
anode cap. Short between anode and
CRT coated earth ground strap.
Coated
Earth
Ground
Strap
1. Discharge the anode of the CRT and remove the anode cap.
2. Unplug all interconnecting leads from the deflection yoke, neck
assembly, degaussing coils and CRT grounding strap.
3. Remove the CB Board from the CRT.
4. Remove the chassis assembly.
5. Loosen the neck assembly fixing screw and remove.
WARNING: High voltage remains in the CRT even after the power is disconnected. To avoid electrical shock, discharge the CRT before
attempting to remove the anode cap. Short between anode and coated earth ground strap of CRT.
NOTE: After removing the anode, short circuit the anode of the picture tube and the anode cap to either the metal chassis, CRT shield,
or carbon painted on the CRT.
REMOVAL PROCEDURES
a
Turn up one side of the rubber cap in
1
the direction indicated by arrow
HOW TO HANDLE AN ANODE CAP
1 Do not use sharp objects which may cause damage to the
surface of the anode cap.
To avoid damaging the anode cap, do not squeeze the rubber
2
covering too hard. A material fitting called a shatter-hook terminal
is built into the rubber.
Do not force turn the foot of the rubber cover. This may cause
3
the shatter-hook terminal to protrude and damage the rubber.
10
9
8
7
6
5
ANODE CAP REMOVAL
b
Use your thumb to pull the rubber
2
. cap firmly in the direction indicated
a
by arrow .
b
— 14 —
4
6. Loosen the deflection yoke fixing screw and remove.
7. Place the set with the CRT face down on a cushion and remove
the degaussing coil holders.
8. Remove the degaussing coils.
9. Remove the CRT grounding strap and spring tentioners.
10. Unscrew the four CRT fixing screws [located on each CRT
corner] and remove the CRT [Take care not to handle the
CRT by the neck].
When one side of the rubber cap
3
separates from the anode button,
the anode cap can be removed by
turning the rubber cap and pulling
it in the direction of arrow
1
2
3
c
Anode Button
.
c