Crown PSA-2 - Page 78

E. Relay Board Module Removal
1. Remove the bottom cover (101) as described in
Section A. Locate the Relay Board Module (See Fig.
7.18).
2. Remove the three pozidrive head screw(s) that
mount the board support bracket. These screws are
easily accessible from the outside of the rear panel
(89).
3. After the entire assembly is loose, it is then pos-
sible to remove the board itself by pushing the four
retaining clips outward and gently lifting the board
out of its support bracket.
4. Allconnections to this board (except T3 primary)
are made through removable clips/ plugs. If their
removal is necessary, note their location for future
reconnection. (See Fig. 7.19).
F. Mother Board Removal
Because there are no active component parts on this
board, replacement or need for removal is highly
unlikely. In addition, special tools and procedures are
needed in order to perform this operation successfully.
Therefore, factory service replacement is highly
recommended.
Should questions or problems arise, contact the Crown
Technical Service Department.
G. Output Terminal Board Removal
1. Remove the bottom cover (101) as described in
Section A.
2. Remove both power transformers (23,24) as
described in Section M.
3. Remove power supply capacitor assembly (25)
as described in Section N.
4. Remove the four board mount screws and nuts
(not shown on exploded view drawings).
5. Gently pull the board away from the unit to
allow the pin-socket combination to disconnect.
H. Muting Module Removal (earlier units only)
1. Remove the bottom cover (101) as described in
Section A. Locate the Muting Board Module (See
Fig.7.18).
2. Push the two retaining clips outward and gently
lift and remove the board.
3. Unsolder the seven colored wires and note their
location for future reconnection.
1. PSA-2 Input Connector Module Removal
1. Remove the bottom cover (101) as described in
Section A. Locate the input connector module (See
Fig. 7.18).
2. Disconnect each of the two-five pin cable connec-
tors. Note their location and pin read-outs for
future reconnection (See Fig.7.19).
3. Remove the six pozidrive head switch mounting
screws (89) as well as the phone jack nuts (74),
For complete removal, it will be necessary to
disconnect the multi-cable plug located at the
Mother Board Module.
J. SA2 Input Connector Module Removal
1. Remove the bottom cover (101) as described in
Section A. Locate the Input Connector Module (See
Fig.7.18).
2. Disconnect each of the two-five pin cable connec-
tors. Note their location and pin read-outs for
future reconnection (also see Fig.7.19).
3. Remove the six pozidrive head, switch mounting
screws (89) as well as the two 3/16” input jack
screws. For complete removal, it will be necessary to
disconnect the multi-cable plug located at the
Mother Board Module.
K. PSA-2 Balanced Input Module Removal
To remove the balanced input module, simply remove the
four pozidrive head mounting screws (105) located two
on the top row and two on the bottom row.
L. PSA-2/SA2 Display Module Removal (includes
front panel removal)
1. Remove the four phillips head front panel mount-
ing screws (108) along with their respective star
washers (two screws per side).
2. Remove the six (3 on top; 3 on bottom) pozidrive
head cover/front panel mounting screws (107).
3. Loosen the four (two per side) pozidrive head top
and bottom front panel extrusion screws (100).
4. Slide the front panel away from the unit as far as
the cables will allow.
5. Disconnect the multi-cable connector located
at the display board.
6. Remove the four mounting nuts and washers
(3,2,1).
M. Power Transformer Removal
1. Remove the bottom cover (101) and front panel
as described earlier (See Section A and L).
2. Remove the six “push-on"terminal wires located
on the voltage terminal strip, adjacent the transformer,
3. Disconnect all other wires that would inhibit
transformer removal. Note their location for future
reconnection (See Fig. 7.19).
4. Remove all six (SA2, five) transformer phillips
head mounting screws (31); four (SA2, four) are
located on the side of the unit and two (SA2, one) are
located behind the front panel. Note when remounting
the transformer, be sure to include all mounting
hardware and place it in the proper position (See
Fig. 6.31).