Crown PSA-2 Service Manual

crown
N. Power Supply Capacitor Replacement
(C101, C201, C102, C202)
Warning
Before attempting any repair work in this area, be sure to
discharge these four large capacitors by connecting a 50
ohm resistor (not less than 10 watt rating) across the
terminals of each capacitor.
1. Remove the bottom cover (101) and front
panel as described earlier (Section A and L).
2. Remove four phillips head screws (39) from the
front panel side, loosening capacitor assembly.
3. With an 11/32” nut driver, loosen and remove
the center bracket shaft nut (56).
4. With a firm hold on all four power capacitors,
pull back gently and position the assembly for best
access to the capacitor terminal screw lugs.
5. Remove desired terminal screws from
capacitor with a flat-head screwdriver (large head,
small shaft works best).
O. Fan Removal
Note: There are actually two versions of fan filters
incorporated in the PSA-2/SA2. Earlier versions used a
hand removable, white filter frame. The latest models use
a black framed filter that is removable only by loosening
four screws (89).
1. Remove the bottom cover (101).
Remove the four-corner phillips head screw-bolt
combination (88).
3. Disconnect the motor and frame by removing the
cori connectors on the Relay Module.
P. Front Panel Controls Removal (Input Level and On
Off Controls
1. Remove the front panel as described earlier
(Section L).
2. Remove knob (15) with proper size allen
wrench.
3. Remove mounting nut and washer (18,17) from
the respective control.
7.7 Reassembly
Reassembly is essentially the reverse of disassembly. If in
doubt about types and sizes of attaching parts, refer to
the appropriate illustration in Section 6.
7.8 Repair Instructions
Repair of the unit includes replacement of component
parts (both on and off the removable modules), damaged
wiring and replacement of any structural parts such as
panels and brackets. All replaceable parts are listed in the
board layout parts lists or in the exploded view drawings
in Section 6.
Fig. 7.19 shows all amplifier wiring connections
including color code, should it become necessary for wire
replacement.
Consumable materials (except wire) required in repairing
the amplifier are listed in Fig. 7.20. The use of these
materials is explained in the last column entitled “Use”.
Soldering techniques and common circuit board repair
procedures are listed in Section 7.3.
7-12

Crown PSA-2 Specifications

General

Brand	Crown
Model	PSA-2
Category	Amplifier
Language	English