- 10 -
Disassembly for Service
Back Cover
Remove all the screws marked with an arrow(
)
from the back of the Receiver.
Note: Screw configuration, type, and number of
screws vary depending on the model of the
Receiver serviced and the application; various
models are covered in this Manual. Use same
hardware when reassembling the receiver.
•
3 screws at the top edge of the Receiver.
•
1 screw at each lower corner of the Receiver.
•
2 screws by the A/V bracket top edge.
•
1 screw by the A/V bracket bottom edge.
A-Board - Main Chassis (See Fig. 5)
The Q and H-Board are assembled on the Main
chassis (A-Board). When servicing these boards,
extension cables may be required. Cables kit can be
ordered from Matsushita Services Company, see Parts
List for parts number. The A-Board assembly rest on a
chassis tray along with the G-Board.
Slide chassis tray out. Gently lift, tray and pull out.
Disconnect plug connectors; release wire ties and
holders as required for complete chassis removal.
•
A-Board is secured to the chassis tray with 8
screws.
•
The G-Board is secured to the chassis tray with 5
screws
•
The A-Board is mated to the G-Board with to
flexible connectors: A22 & A23 (G2 and G3 on the
G-Board, respectively). To remove either boards,
unplug the connectors on the A-Board.
Note: Some tie-wraps that secure the wire dressings
may need to be unfastened for chassis
removal.
C-Board - CRT Output
Plugs into the socket on the CRT neck.
To unplug Screen and Focus cables from CRT
socket, lift the tabs on the socket and pull the
cables as shown. To plug cables, close the tabs
then insert the cable.
Figure 4. Focus and Screen cables.
H-Board - A/V Jacks, S-Video Connectors
and Video Switch
Plugs onto the A-Board at the A11 (H11) connector
Q-Board - Horizontal Drive
Plugs onto the A-Board at the A6, A7 and A8
(QC6, QC7 and QC8) connectors. Is secured to
Q551 heat sink by two screws.
Note: Use a small flat head screwdriver to
release the connector locking tabs.
Speaker Dome
Each speaker is secured to the front cabinet with 2
screws. (See Fig. 6)
Disassembly for CRT
Replacement
1.
Discharge the CRT as instructed in the Safety
Precautions (see page 2) and remove 2nd anode
button from the CRT.
2.
Remove Speaker Modules (R & L)
3.
Disconnect:
A-Board = Deflection Yoke (DY), Deg. Coil
G-Board = Speakers (G8),
C-Board = C2 Conv. Yoke, C1 DAG GND.
4.
Remove Convergence and Deflection Yoke from
CRT neck.
5.
Perform complete removal of the Main Chassis,
G-Board and CRT-Board as instructed in
Disassembly for Service.
CRT Replacement
1.
Perform Disassembly for CRT Replacement
procedure.
2.
Insure that the CRT H.V. Anode button is
discharged before handling the CRT. Read the
Safety Precautions (see page 2) on handling the
picture tube.
3.
Remove the components from the CRT neck and
place the cabinet face down on a soft pad.
4.
Note the original order for the CRT mounting
hardware as they are remove from the CRT
mounting brackets at each corner of the CRT.
5.
Remove the CRT with the degaussing coil and the
dag ground braid attached.
6.
Note the original locations and mounting of the
degaussing coil and the dag ground assembly to
insure proper reinstallation on the replacement
CRT.
To remove and remount the degaussing coil:
The degaussing coil is held in place by clampers
fastened to the CRT corner ears. These clampers
must be installed onto the replacement CRT prior
to mounting the degaussing coil.
To remove and remount the dag ground braid:
a.Unhook the coil spring from the bottom corners
of the CRT ears.
b.Release the braid loop from the upper corners of
the CRT ears.
7.
Mount the dag ground braid on the replacement
CRT. Position the degaussing coil with new ties.
Dress coil as was on the original CRT.
8.
Replace the components on CRT neck and
reinstall into cabinet. Verify that all ground wires
and circuit board plugs get connected.
