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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; various models are covered
in
this
manual.
reassembling the receiver.
•
3 screws at the top edge of the receiver.
•
1 screw at each lower corner of the receiver.
•
1 screw by the AC cord assembly.
•
1 screw by the A/V jacks.
•
1 screw by the flyback assembly.
A-Board -- Main chassis
1. Slide the chassis completely out of the guide rails.
2. Stand the receiver on its edge. The underside of
the board is completely accessible for component
replacement.
Note: Some tie-wraps that secure the wire dressings
may need to be unfastened for chassis
removal.
C-Board -- CRT output
The board plugs onto the socket on the CRT neck.
To release the Focus wire, use a dull object to
release the tab on the socket (near the wire
opening) and carefully pull on the wire. To connect
the focus wire, press on the tab to lock it then insert
the wire in the opening and press on it until it is fully
inserted and locked in place.
Z-Board -- (some models)
Plugged onto A-Board
DI-Board -- (some models)
Plugged onto A-Board, behind back A/V jacks
Speakers
Each speaker is secured to the cabinet's front with
2 screws.
Keyboard push button assembly
Fastened with screws to the inside of the cabinet
front.
Disassembly for service
Reuse
hardware
when
Disassembly for CRT replacement
1. Discharge the CRT as instructed in the safety
)
precautions (see page 2).
2. Disconnect the yoke (DY) plug, degaussing coil
(DEG) plug from the main board.
3. Unplug the CRT 2nd anode button from the main
board.
4. Remove the C-Board from the CRT base and
unplug the black wire (CRT dag ground) C10.
5. Disconnect the A11, A12, and Speakers plugs from
the A-Board.
6. Lift the Main Chassis (A-Board) and all mounted
boards completely out with the CRT Board attached.
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 re-mount 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 re-mount 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.
- 9 -
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