- LOCKED LOOP
TECHNICAL MANUAL
4.3 PIO BOARD
6.5.4 Removing and Instaling The Main PC Board
Refer to Figure 6-16 for the positions of the components referenced iri this procedure.
MAIN PC BOARD
Cable Connections
FAN POWER PANEL
Figure 6-16
A. To remove the Main PC Board, proceed as follows:
1) Open the ADVANTAGE cabinet as described in Section 6.5.2.
2) Remove the keyboard as described in Section 6.5.3.
3) Disconnect the video cable from J7 on the Main PC Board (see Figure 6-16). To remove the cable, pull straight up on the cable connector.
4) If any 1/0 Boards are installed in the Main PC Board, record their slot positions. When they are reinstalled, they must be returned to these same positions.
5) Remove the 1/0 Boards. For each board, remove the retaining screw (if any). Gently pull board toward the front of the system and upward, removing it from its connector.
6) Remove the Main PC Board mounting screws. Unscrew the retaining screws located along the front edge of the main PC board (see Figure 6-15).
7} Lift up the front edge of the Main PC Board as shown in Figure 6-l7a, and pull forward until the rear edge of the PC board is free of the base plate. (The cables along the right-hand edge of the PB board are still connected at this time.)
8) Maneuver the Main PC Board into the posi tion shown in Figure 6-l7b.
9) Remove the connectors from J8 through Jll by pulling them straight up. Do not pull on the wires.
10) The Main PC Board can now be lifted out of the base plate.
B. To install the Main PC Board, proceed as follows:
1) Place the Main PC Board in the position shown in Figure 6-l7a.
2) Clear away any cables or connectors that may be under the PC board.
3) Slide the rear edge of the Main PC Board under the three tabs at the rear of the base plate.
ADVANTAGE 6-34 TECHNICAL MANUAL
A
B
MAIN PC BOARD
MAIN PC BOARD
Main PC Board Removal
BASE ASSEMBLY
BASE ASSEMBLY
Figure 6-17
4) Lower the PC board to the horizontal position.
5) Install the cables in J7 through Jll as shown in Figure 6-16.
6) Install the two Main PC Board mounting screws at the locations shown in Figure 6-15, and tighten the screws.
7) Reinstall the IIO Boards (if any). Insert them into their connectors at the left rear corner of the Main PC Board. These boards must be returned to the same connectors from which they were removed. Reinstall the retaining screws (if any) associated with any of these boards.
8) Install the keyboard as described in Section 6.5.3.
9) Close the ADVANTAGE cabinet as described in Section 6.5.2.
Disk Drive Shield Removal
Figure 6-18
ADVANTAGE 6-36
DISK --DRIVE
ASSEMBLY
TECHNICAL MANUAL
6.5.5 Removing and Installing a Disk Drive
The following steps cover the removal of the upper disk drive. To remove the lower disk drive apply these instructions to the corresponding parts of the lower drive.
1) Open the ADVANTAGE cabinet as described in Section 6.5.2.
2) Remove the two screws securing the Disk Drive Shield, and remove' the shield (see Figure 6-18).
Avoid dropping the screws into the base plate, as they may roll under the Main PC Board and be difficult to retrieve.
DRIVE PC BOARD
Disk Drive Cabling
DRIVE MOUNTING BRACKET RIBBON
CABLE CONNECTOR
Figure 6-19
POWER CONNECTOR
3) Disconnect the power connector shown in Figure 6-19.
Hold onto the edge of the Drive PC. Board while pulling down on this connector.
6.5.6
5) Remove the drive mounting screws. There are four screws, two at each side, holding the drive to the drive mounting bracket.
6) Remove the upper drive by sliding it forward as shown in Figure 6-20.
Disk Drive 1 Removed
DRIVE ___ - - MOUNTING
BRACKET
Figure 6-20
Th~ installation procedure for either disk drive is essentially the reverse of the procedure given for its removal, except that the position of the drive may have to be adjusted, so that the front panel of the drive mates properly with the front of the cabinet.
Removing and Installing the Power Supply Components This section explains how to remove and install the diode bridge and capacitor located behind and below the disk drives (see Figure 6-21). To remove either of these components proceed as follows:
1) Open the ADVANTAGE cabinet as described in Section 6.5.2.
ADVANTAGE 6-38 TECHNICAL MANUAL
2) Remove both disk drives following the procedure described in Section 6.5.5. The drives must be removed to gain access to the mounting bracket for the power supply components.
3) From the top of the chassis, remove the two screws which secure the power supply mounting bracket shown in Figure 6-21.
4) Remove the wires from the desired component (either the diode br idge or the capaci tor) , carefully marking their location so that they may be re-connected later.
5) Remove the component from its mounting bracket.
To install either of the power supply components, reverse the above procedure. When installing the diode bridge, insure that the (+) and (-) corners of the bridge are positioned as shown in Figure 6-21.
POWER SUPPLY MOUNTING BRACKET
Power Supply Components
DIODE BRIDGE
TO MAIN PC BOARD
~ FROM POWER TRANSFORMER
Figure 6-21
DISK DRIVE MOUNTING BRACKET
6.5.7 Removing and Installing the CRT and Video PC Board
If either the CRT or the Video PC board needs to be replaced, then both of these assemblies should be replaced. The CRT and Video PC Board are factory aligned and stocked as matched pairs. Replacing just one assembly may result in a misaligned video display.
WARNING
THIS PROCEDURE SHOULD BE PERFORMED ONLY BY QUALIFIED PERSONNEL.
WEAR SAFETY GLASSES OR EQUIVALENT EYE PROTECTION WHEN PERFORMING THIS PROCEDURE.
BE EXTREMELY CAREFUL NOT TO STRIKE ANY OBJECT AGAINST THE CRT, OR TO PUT PRESSURE ON THE NECK OF THE CRT.
IF THE CRT IS BROKEN IT MAY IMPLODE AND CREATE A HAZARD BECAUSE OF FLYING GLASS.
A. To remove these assemblies proceed as follows:
1) Open the ADVANTAGE cabinet as described in Section 6.4.2. The video components described in this section are shown in Figures 6-22, 6-23 and 6-24.
2) Disconnect the two wires from the fan by grasping the wire terminals and pulling them off as shown in Figure 6-23.
ADVANTAGE 6-40 TECHNICAL MANUAL