Sony KV-21FK120 Service Manual ▷ View online
10
KV-21FK120
KV-21FK120
1 Depress the PC Board clips to release
KR Board.
2 Disconnect the CN515 cable
3 Press on catch tab to release A Board
and gently pull away from the set.
1-3. SERVICE POSITION
CV Board
A Board
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KV-21FK120
KV-21FK120
1. Discharge the anode of the CRT and remove the anode cap.
2. Unplug all interconnecting leads from the defl ection yoke, neck
assembly, degaussing coils and CRT grounding strap.
3. Remove the CV Board from the CRT.
4. Remove the chassis assembly.
5. Loosen the neck assembly fi xing screw and remove.
6. Loosen the defl ection yoke fi xing 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 tension devices.
10. Unscrew the four CRT fi xing screws [located on each CRT
corner] and remove the CRT
[Take care not to handle the CRT by the neck].
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.
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
ANODE CAP REMOVAL PROCEDURE
WARNING: 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 coated earth ground strap of CRT.
NOTE: After removing the anode cap, 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.
remove the anode cap. Short between anode and coated earth ground strap of CRT.
NOTE: After removing the anode cap, 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
HOW TO HANDLE AN ANODE CAP
1. Do not use sharp objects which may cause damage to the surface of the anode
cap.
2. To avoid damaging the anode cap, do not squeeze the rubber covering too
hard. A material fi tting called a shatter-hook terminal is built into the rubber.
3. Do not force turn the foot of the rubber cover. This may cause the shatter-hook
terminal to protrude and damage the rubber.
Turn up one side of the rubber cap in
the direction indicated by arrow a .
the direction indicated by arrow a .
Use your thumb to pull the rubber
cap fi rmly in the direction indicated
by arrow b .
cap fi rmly in the direction indicated
by arrow b .
When one side of the rubber cap separates from
the anode button, the anode cap can be removed
by turning the rubber cap and pulling it in the
direction of arrow c .
the anode button, the anode cap can be removed
by turning the rubber cap and pulling it in the
direction of arrow c .
a
b
Anode Button
c
1-4. PICTURE TUBE REMOVAL
10
5
4
3
1
2
8
7
9
6
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KV-21FK120
KV-21FK120
WIRE
DRESSINGS
- Fix RGB harness (A/CN301~CV/CN1752) to rotation
coil using a 9mm purse lock (3-703-982-02).
- Dress heaters harness (A/CN586~CV/CN1751) over
rotation coil's lead wire as shown in picture.
- Install rotation coil lead wire connection under DY clip
coil using a 9mm purse lock (3-703-982-02).
- Dress heaters harness (A/CN586~CV/CN1751) over
rotation coil's lead wire as shown in picture.
- Install rotation coil lead wire connection under DY clip
Under clip
Dress DY's lead wire using a DGC purse lock (4-
081-411-02).
Make a loop as shown in picture.
NOTE: Use CRT carbon paint as a reference
081-411-02).
Make a loop as shown in picture.
NOTE: Use CRT carbon paint as a reference
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KV-21FK120
KV-21FK120
Twist G2 wire without stressing it
Dress focus lead and HV cable together using 5mm purse lock
(3-703-981-02), install purse lock 100mm from HV cable's cap.
Dress focus lead through CV board's hook.
(3-703-981-02), install purse lock 100mm from HV cable's cap.
Dress focus lead through CV board's hook.
100mm
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