Section Vii - Video Monitor - Radio Shack TRS-80 III Service Manual

4. To remove the Disk Drive in the bottom position, you
must first remove the Disk Drive Power Supply.
5. After removing the Power Supply, remove the FDC
inter-connect cable from the rear of the Drive.
6. Remove the four screws and washers (two on each side)
which connect the Drive to the Disk Mounting Bracket.
7. Disconnect the power supply connector from the bot-
tom of the top board in the Disk Drive and also remove
the ground wire from the rear of the Drive.
VIDEO MONITOR (CRT) AND VIDEO BOARD
1. Disconnect the four color coded wires with spade lugs
from the CRT yoke. (Be sure to note their positions.)
2. Disconnect the connector on the rear of the CRT neck.
WARNING
There may be a high voltage charge on the high voltage
anode. To discharge, connect one end of a wire to a
known good ground and connect the other end of the
wire to the blade of a common screwdriver. Insert the
screwdriver blade under the suction cup and touch it
to the clip holding the wire to the CRT.
8
3. Insert a common screwdriver under the suction cup on
the high-voltage anode wire on the side of the CRT. Use
the screwdriver to compress the clip holding the wire to
the tube and pull the wire free.
4. Remove the ground wire fastened directly to the Video
Board.
5. Remove the upper right and It>wer left nuts and washers
which hold the CRT in place.
CAUTION
If dropped, the CRT may implode. To avoid this kind of
accident, support the CRT while performing the next
step.
6. Remove the remaining
I~wer
right and upper left nuts,
and washers and carefully remove the CRT.
7. Disconnect the CPU cable connector from the Video
Board.
8. Remove the two screws fastening the Video Board to the
Case Top and carefully lift out Board.