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Figure 9. PS1 Power Stand Electronics Module with Top Cover Removed
77
Disassembly Procedures
Power Stand Procedures

Note: Refer to Figure 9 for the following
procedures.

1. Lower Housing Removal

1.1 Place the power stand on a soft surface
so that the line array opening faces down.

1.2 Using a Phillips-head screwdriver,
remove the 19 screws that secure the lower
housing to the upper housing. Lift off the
lower housing.

2. Amplifier Housing Removal

2.1 Perform procedure 1.

2.2 Make a note of the wiring, and discon-
nect the wiring harnesses and connectors
that run to the amplifier housing. The ampli-
fier housing is the large metal box with the
four fans.

2.3 Using a Phillips-head screwdriver,
remove the four screws that secure the
power stand base plate to the bottom of the
line array cavity. Lift it off of the cavity. Be
careful not to damage any wires.

2.4 Once all of the wiring is disconnected,
use a Phillips-head screwdriver to remove
the 16 screws that secure the amplifier
housing to the power stand upper housing.
Carefully lift the amplifier housing out of the
power stand upper housing.

3. Line Array Cavity Removal

3.1 Perform procedure 2.

3.2 Using a Phillips-head screwdriver,
remove the three screws that secure the line
array cavity to the upper housing. Lift the line
array cavity off of the upper housing. The
power stand foot pedal will disengage from
the shaft.

78
Disassembly Procedures
4. Amplifier PCB Removal

4.1 Perform procedure 2.

4.2 Make a note of the wiring and disconnect
all of the wiring harnesses that connect the
power supply box to the DSP PCB and to the
microprocessor PCB.

4.3 Using a Phillips-head screwdriver,
remove the 24 screws that secure the power
supply box top cover in place. Lift off the top
cover.

4.4 Once you have the top cover off, make a
note of the wiring configuration and unplug
the wiring harnesses that connect to the
amplifier PCB.

4.5 Using a Phillips-head screwdriver,
remove the 6 screws that secure amplifier
PCB in place. Lift the amplifier PCB out of
the chassis.

5. Switching DC Power Supply Removal

5.1 Perform procedure 2.

5.2 Make a note of the wiring and disconnect
all of the wiring harnesses that connect the
power supply box to the DSP PCB and to the
microprocessor PCB.

5.3 Using a Phillips-head screwdriver,
remove the 24 screws that secure the power
supply box top cover in place. Lift off the top
cover.

5.4 Once you have the top cover off, make a
note of the wiring configuration and unplug
the wiring harnesses that connect to the
switching DC power supply PCB you wish to
remove.

5.5 Using a Phillips-head screwdriver,
remove the 4 screws that secure power
supply PCB in place. Lift the power supply
PCB out of the chassis.

79
Disassembly Procedures
6. Auxiliary Power Supply Removal

6.1 Perform procedure 2.

6.2 Make a note of the wiring and disconnect
all of the wiring harnesses that connect the
power supply box to the DSP PCB and to the
microprocessor PCB.

6.3 Using a Phillips-head screwdriver,
remove the 24 screws that secure the power
supply box top cover in place. Lift off the top
cover.

6.4 Once you have the top cover off, make a
note of the wiring configuration and unplug
the wiring harnesses that connect to the
switching DC power supply PCB you wish to
remove.

6.5 Using a Phillips-head screwdriver,
remove the 4 screws that secure power
supply PCB in place. Lift the power supply
PCB out of the chassis.

7. EMI Filter PCB Removal

7.1 Perform procedure 2.

7.2 Make a note of the wiring and disconnect
all of the wiring harnesses that connect the
power supply box to the DSP PCB and to the
microprocessor PCB.

7.3 Using a Phillips-head screwdriver,
remove the 24 screws that secure the power
supply box top cover in place. Lift off the top
cover.

7.4 Once you have the top cover off, make a
note of the wiring configuration and unplug
the wiring harnesses that connect to the EMI
Filter PCB.

7.5 Using a Phillips-head screwdriver,
remove the 4 screws that secure the EMI
Filter PCB in place. Lift the EMI Filter PCB
out of the chassis.

80
Disassembly Procedures
8. Chassis Fan Removal

8.1 Perform procedure 2.

8.2 Using a Phillips-head screwdriver,
remove the 24 screws that secure the power
supply box top cover in place. Lift off the top
cover.

8.3 Using a Phillips-head screwdriver,
remove the 4 screws that secure the fan to
the chassis.

8.4 Follow the wire harness for the fan you
are removing to the auxiliary power supply
PCB and unplug it. Lift the fan out of the
chassis.

Re-assembly note: When installing the new
fan, be sure to match the orientation of the
fan next to it so that it will move air in the
proper direction when in use.

9. Microprocessor PCB Removal

9.1 Perform procedure 1.

9.2 Make a note of the wiring configuration
and unplug the six wire harnesses from the
connectors on the board.

9.3 Lift the microprocessor PCB off of the
connectors that engage it on the bottom of
the board and the pins that connect to the
preset switches.

Re-assembly note: When re-installing this
PCB, be sure that all of the pins from the
preset switches are straight and properly
engage the connectors on the bottom of the
microprocessor PCB.

81
Disassembly Procedures
10. DSP PCB Removal

10.1 Perform procedure 1.

10.2 Make a note of the wiring configuration
and unplug the six wire harnesses from the
connectors on the board.

10.3 Using a pair of needle-nose pliers,
compress the bottoms of the plastic standoff
posts used to attach the DSP PCB to the
Input/Output PCB. Lift the DSP PCB off of
the I/O PCB.

11. Input/Output PCB Removal

11.1 Perform procedures 9 and 10.

11.2 On the front panel of the power stand,
remove the four knobs for the mic trim and
level controls.

11.3 Using a nut driver, remove the nine nuts
and washers for the 1/4 inch phono jacks.

11.4 Using a Phillips-head screwdriver,
remove the 16 screws that secure the XLR,
Data in/out and Neutrik connectors to the
front panel.

11.5 Lift the I/O PCB off of the input panel.

82
Disassembly Procedures
Line Array Procedures 4. Upper Line Array Top End Cap Removal

Note: The line arrays are divided into a 4.1 Using a Phillips-head screwdriver,
lower line array, which plugs directly into the remove the seven screws that secure the
power stand, and an upper line array, which end cap to the line array enclosure. Lift off
uses a bayonet arrangement to align the the end cap.
upper array to the lower array for connec-
tion. All electrical connections are automati- Re-assembly note: Make sure that the end
cally made when the arrays are mounted cap gasket is properly aligned to achieve an
into the power stand and the upper array is airtight seal.
mounted to the lower array.
5. Upper Line Array Bottom End Cap
Note: Refer to Figure 7 for the following Removal
procedures.
5.1 Using a Phillips-head screwdriver,
1. Grille Removal remove the seven screws that secure the
end cap to the line array enclosure. Lift the
1.1 Using a Phillips-head screwdriver, end cap away from the enclosure. Unplug
remove the six screws that secure the end the molex connector from the speaker
cap to the line array enclosure. Lift off the harness.
end cap. Unplug the molex connector from
the speaker harness. Re-assembly note: Make sure that the end
cap gasket is properly aligned to achieve an
1.2 Grasp the edge of the grille and gently airtight seal.
lift it away from the enclosure.
6. Lower Line Array Top End Cap Removal
2. Nameplate Removal
6.1 Using a Phillips-head screwdriver,
2.1 Perform procedure 1. remove the six screws that secure the end
cap to the line array enclosure. Lift off the
2.2 On the back of the grille, unbend the end cap. Unplug the molex connector from
legs of the logo. Lift off the nameplate. the speaker harness.

3. Driver Removal Re-assembly note: Make sure that the end
cap gasket is properly aligned to achieve an
3.1 Perform procedure 1. airtight seal.

3.2 Using a Phillips-head screwdriver, 7. Lower Line Array Bottom End Cap
remove the four screws that secure the Removal
driver to the enclosure.
7.1 Using a Phillips-head screwdriver,
3.3 Lift the driver out of the enclosure. Note remove the seven screws that secure the
the wiring configuration and cut the wires as end cap to the line array enclosure. Lift the
close to the driver terminals as possible. end cap away from the enclosure. Unplug
the molex connector from the speaker
harness.

Re-assembly note: Make sure that the end
cap gasket is properly aligned to achieve an
airtight seal.

83
Disassembly Procedures
8. Front Cap Removal 4. Input Panel Removal

8.1 Using a Phillips-head screwdriver, 4.1 Using a Phillips-head screwdriver,
remove the four screws that secure the front remove the four screws that secure the
cap to the bottom front of the line array input panel to the bass module enclosure.
enclosure. Lift the end cap away from the
enclosure. 4.2 Lift the input panel away from the bass
module enclosure.
Bass Module Procedures
4.3 Make a note of the wiring configuration
Note: Refer to Figure 8 for the following and un-solder the speaker harness wires
procedures. from the input panel.

1. Grille Removal

1.1 Using an allen wrench, remove
the four screws that secure the grille to the
upper and lower speaker end caps.

1.2 Lift off the grille.

2. Nameplate Removal

2.1 Perform procedure 1.

2.2 On the back of the grille, remove the
retaining nut and spring from the post of the
nameplate. Lift the nameplate off of the
grille.

3. Driver Removal

3.1 Perform procedure 1.

3.2 Using a Phillips-head screwdriver,
remove the four screws that secure the
driver to the bass module enclosure.

3.3 Lift the driver out of the enclosure. Note
the wiring configuration and cut the wires as
close to the driver terminals as possible.

Re-assembly notes:
- When soldering the speaker harness wires
to the new driver, be sure to observe polarity
of the driver harness wires.
- Be sure to properly align the gasket behind
the new driver to ensure an airtight fit.

84
BLOCK DIAGRAM - Signal Processing + Routing
Max. Level = +18dBV [input buffer clips] Level
Nom. Level = -1dBV Ch1 Line Out Nom.: +6dBV (Balanced) +20dB 20K 15A
Min. Level = -46dBV for full output Clip@+24dBV "
(Ch1 Vol+Master @ Max) +1
2 1 Ch 3 IN
+2.6dB @ 12:00
Input-LINE
Max. Level = +40dBV+
3

+1 -12 to +30 dB Nom. -10dBV Level Nom. Level = -13dBV (pot @ ctr)
-1
+1dB @ ctr Clip@+6dBV +20dB 20K 15A Min. Level = -30dBV for full output
Line (1/4") input
Ch1 Insert CS5361 ADS21065L Ch 4 IN
Sig/OL
-20dB
Red=Clip=+6dBV
+8 to +50 dB
Trim Green=Signal= -30dBV A/D
CS4392
Figure 10. PS1 Power Stand Block Diagram

Ch1 +21dB @ ctr
Mic (XLR) input
Ring = Send
-1.5dB
1 2 5K 10C A/D D/A LPF
Tip = Return
-1.5dB
INA163 Nom.: 0dBV TCA9459F Nom. -10dBV
DSP D/A
3

Clip@+18dBV Clip@+6dBV CS5361 LPF
0dB
Input-MIC 2-Ch. +1 0dB
-1 +1 1
2
+1 A/D 3
Max. Level = +10dBV
Nom. Level = -21dBV(Trim ctr)
+24 Digital Max. Gain = 0dB
Nom. Gain = -10dB (12:00)
Bass Send 1 8 0dB
2 4
Min. Level = -66dBV for full output +24v Volume Min. Gain = -40dB 0dB 3 7
+1
(Trim, Ch1 Vol+Master @ Max) +1 A/D 8 6
PHANTOM
Off Control +1
Nom. -10dBV 4 5
0dB
Clip@+6dBV 7 9
SPDIF 6
Input-LINE Ch2 Insert Data In Rcvr 5 All-Amps Hi/Full Range
(SPDIF) Master Vol Ctrl 9
+1 -12 to +30 dB CS8416 Amp1
+1dB @ ctr Input

85
Line (1/4") input
Data-Out
SPDIF Bass LineSource Top
Xmiter 0dB
Sig/OL
-20dB (SPDIF) Power / Protect / Diagnostic +5 Power
Ring = Send CS8406 +1
Amp
Trim

1+
+8 to +50 dB Tip = Return S3PC8475 Amp In 1
Ch2 +21dB @ ctr
Mic (XLR) input
Bass Slave Sense +29dB 1- 2-
1 2 5K 10C