- 8 -
Disassembly for Service
Back Cover
Remove all the screws marked with an arrow(
)
from the back of the Receiver (Fig. 3).
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.
•
1 screw by the A/V jacks.
•
1 screw by the Flyback assembly.
•
1 screw by the Digital input. (some models)
A-Board - Main Chassis
(Fig. 6)
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
Plugs into the socket on the CRT neck.
DI-Board (some models)
Plugged onto A-Board, behind A/V jacks. Has also
a screw to Back Cover.
Z-Board (some models)
Plugged onto Main panel.
Speakers
Each speaker is secured to the front of cabinet with
4 screws.
Keyboard Push Button Assembly
Fastened to the inside of the cabinet front with up
to 3 screws.
Disassembly for CRT Replacement
1.
Discharge the CRT as instructed in the Safety
Precautions (page 2).
2.
Disconnect the yoke (DY) plug, degaussing coil
(DEG) plug and the CRT 2nd anode button from
the main board.
3.
Remove the C-Board from the CRT base and
unplug the black wire (CRT dag ground) C10.
4.
Disconnect the A11, A12, and Speakers plugs from
the A-Board.
5.
Lift the Main Chassis (A-Board) and all mounted
boards completely out with the CRT Board attached.
CRT Replacement
1.
Insure that the CRT H.V. Anode button is
discharged before handling the CRT. Read the
Safety Precautions (page 2) on handling the
picture tube.
2.
Remove the components from the CRT neck and
place the cabinet face down on a soft pad.
3.
Note the original order for the CRT mounting
hardware as they are remove from the CRT
mounting brackets at each corner of the CRT.
4.
Remove the CRT with the degaussing coil and the
dag ground braid attached.
5.
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.
6.
Mount the dag ground braid on the replacement
CRT. Position the degaussing coil with new ties.
Dress coil as was on the original CRT.
7.
Replace the components on CRT neck and
reinstall into cabinet. Verify that all ground wires
and circuit board plugs get connected.
