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bose-ps1-l1-rev1-schematics


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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
                                                                                                                                                                                                                    



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