Bose Ps1 L1 Schematic

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

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 amplifier 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.

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.

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.

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.

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.

Disassembly Procedures

Line Array Procedures

Note: The line arrays are divided into a

lower line array, which plugs directly into the power stand, and an upper line array, which uses a bayonet arrangement to align the upper array to the lower array for connection. All electrical connections are automatically made when the arrays are mounted into the power stand and the upper array is mounted to the lower array.

Note: Refer to Figure 7 for the following procedures.

1. Grille Removal

1.1 Using a Phillips-head screwdriver,

remove the six screws that secure the end cap to the line array enclosure. Lift off the end cap. Unplug the molex connector from the speaker harness.

1.2 Grasp the edge of the grille and gently lift it away from the enclosure.

2. Nameplate Removal

2.1 Perform procedure 1.

2.2 On the back of the grille, unbend the

legs of the logo. Lift off the nameplate.

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 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.

4. Upper Line Array Top End Cap Removal

4.1 Using a Phillips-head screwdriver,

remove the seven screws that secure the end cap to the line array enclosure. Lift off the end cap.

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

5. Upper Line Array Bottom End Cap Removal

5.1 Using a Phillips-head screwdriver,

remove the seven screws that secure the end cap to the line array enclosure. Lift the 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.

6. Lower Line Array Top End Cap Removal

6.1 Using a Phillips-head screwdriver,

remove the six screws that secure the end cap to the line array enclosure. Lift off the 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 airtight seal.

7. Lower Line Array Bottom End Cap Removal

7.1 Using a Phillips-head screwdriver,

remove the seven screws that secure the end cap to the line array enclosure. Lift the 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.

Disassembly Procedures

8. Front Cap Removal

8.1 Using a Phillips-head screwdriver,

remove the four screws that secure the front cap to the bottom front of the line array enclosure. Lift the end cap away from the enclosure.

Bass Module Procedures

Note: Refer to Figure 8 for the following

procedures.

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.

4. Input Panel Removal

4.1 Using a Phillips-head screwdriver,

remove the four screws that secure the input panel to the bass module enclosure.

4.2 Lift the input panel away from the bass module enclosure.

4.3 Make a note of the wiring configuration and un-solder the speaker harness wires from the input panel.

Figure 10. PS1 Power Stand Block Diagram

BLOCK DIAGRAM - Signal Processing + Routing

Rev:

0 1

Input-LINE

1 2

Input-MIC

INA163

+8 to +50 dB

Trim

PHANTOM

+24

Off

+24v

A/D

CS5361

D/A

CS4392

PHANTOM

Ch1

Digital

Volume

Control

2-Ch.

A/D

Ch1 Insert

Ch2 Insert

High

Remote

Level

Mid

Low

Ch1 Ch2

Ring = Send

Tip = Return

µC

432

678

All-Amps

D/A

Ch1 Line Out

Ch2 Line Out

Master

Amp In 1

Amp In 3

Amp In 2

Power

Amp

Amp1

Power

Amp

Amp2

Power

Amp

Amp3

Hi/Full Range

Bass

LineSource Top

Master Vol Ctrl

0 1

PRESET

Ch1 Ch2

8/4 ohm Sense

LineSource Bottom

Sig/OL

Sig/OLSig/OL

BASS SPEAKER SENSING:

R=Open: Amp1&2 Wider-Band EQ

R=10K: 40-150Hz X-Over on Bass, >150Hz-Hi

R=5K: X-Over on Bass Ch, -6dB Hi Range

R<5K: Debug Mode: All outs flat, Limiter Off

Data In

Data-Out

SPDIF

Rcvr

Ring = Send

Tip = Return

DSP

CS8416

A/D

CS5361

+20dB

A/D

Ch 3 IN

Ch 4 IN

20K 15A

Level

+20dB

20K 15A

DSP Processing Block Diag

-1

Ch1/2 Preset

Remote

Ch1 In

Ch2 In

Ch 3 In

Ch 4 In

Hi Out

Bass Out

Sys. EQ+X-Over, Hi

S-DATA Out

Limiter

S3PC8475

TCA9459F

User EQ Preset EQNoiseGate

(to SPDIF)

(SPDIF)

ADS21065L

+1dBV (1.1V) for

250W@4 Ohms

+29dB

Clip @ +30dBV

Master Vol. Range: -80 to +22dB (+10 @ 12:00)

Sys. EQ+X-Over, Lo Limiter

(250W 4ohms)

5K 10C

Nom.: 0dBV

Clip@+18dBV

Max. Gain = 0dB

Nom. Gain = -10dB (12:00)

Min. Gain = -40dB

Red=Clip=+6dBV

Green=Signal= -30dBV

Knee=+1.5dBV

Clip= -4dBV into A/D

Signal= -40dBV into A/D

Max. Level = +40dBV+

Nom. Level = -13dBV (pot @ ctr)

Min. Level = -30dBV for full output

Nom. -10dBV

Clip@+6dBV

Nom. -10dBV

Clip@+6dBV

Nom. -10dBV

Clip@+6dBV

Max. Level = +18dBV [input buffer clips]

Nom. Level = -1dBV

Min. Level = -46dBV for full output

(Ch1 Vol+Master @ Max)

Max. Level = +10dBV

Nom. Level = -21dBV(Trim ctr)

Min. Level = -66dBV for full output

(Trim, Ch1 Vol+Master @ Max)

+21dB @ ctr

Persistence = 100msec

0dB

Nom.: +6dBV (Balanced)

Clip@+24dBV "

0dB

-1.5dB

Nom.: +6dBV (Balanced)

Clip@+24dBV "

432

678

Bass Send

Input

Bass Slave Sense

SPDIF

Xmiter

CS8406

Power / Protect / Diagnostic

0dB

-1 +1

LPF

-1

-20dB

Mic (XLR) input

-12 to +30 dB

+1dB @ ctr

Line (1/4") input

Input-LINE

1 2

Input-MIC

INA163

+8 to +50 dB

Trim

Ch2

Sig/OL

5K 10C

+21dB @ ctr

-20dB

Mic (XLR) input

-12 to +30 dB

+1dB @ ctr

Line (1/4") input

+24

Off

+24v

+2.6dB @ 12:00

Test Procedures

PS1 Power Stand Tests

Equipment Required

• dB Meter

• Digital Multi-meter

• Audio Signal Generator

• Distortion Meter

• 3 - 4 Ohm, 250 Watt Load Resistors

• Test cables, see Appendix

Overall PS1 System Tests

Notes:

1. Do not connect the R1 remote control for

the following tests, unless specified. Powering up the PS1 power stand without the remote has the same effect as setting all of the controls on the remote to the midpoint.

2. On the front panel of the PS1, set the Channel 1 and Channel 2 Preset Select switches to 00. Short out the 2+ and 2connections on the Amp 3 out connector using the test cable described in section 1 of the appendix of this manual. This will put the PS1 into debug mode for the following tests. In this mode the crossover, the compressor and the EQ are disabled. The DSP will pass a flat response. The level controls and the clip indicators still operate in this mode.

3. Refer to Figure 10, PS1 Block Diagram, for the following procedures.

1. Channel 1 and 2 Mic Input Gain Tests

1.1 Place a 1/4! mono shorting plug into the

Amp 2 IN and Amp 3 IN jacks on the right hand side of the input/output panel. This will disable the channel 2 and 3 amplifiers while testing the channel 1 amplifier.

1.2 On the left hand side of the input/output panel, set the channel 1 Mic Trim control to the 6 setting. Ensure that the Phantom Power push button is not pushed in.

1.3 Using a balanced XLR male input cable, apply a 1 kHz, -30dBV signal to the channel 1 input.

1.4 Reference a dB meter to the input level. Measure the gain output at the Amp 1 OUT jack. It should be +48.5 dB

+ 3 dB.

1.5 Move the shorting plug from the Amp 2 IN jack to the Amp 1 IN jack and repeat steps 1.1 to 1.4 for the channel 2 Mic input.

2. Channel 1 and 2 Mic Input Frequency Reponse and Distortion Tests

2.1 Place a 1/4! mono shorting plug into the

Amp 2 IN and Amp 3 IN jacks on the right hand side of the input/output panel. This will disable the channel 2 and 3 amplifiers while testing the channel 1 amplifier.

2.2 On the left hand side of the input/output panel, set the channel 1 Mic Trim control to the 6 setting. Ensure that the Phantom Power push button is not pushed in.

2.3 Using a balanced XLR male input cable, apply a 1 kHz, -30 dBV signal to the channel 1 input.

2.4 Use an 80kHz low-pass filter on your measuring equipment. Reference a dB meter to the input level. Measure the frequency response at the Amp 1 OUT jack. It should be 0 dB

+ 3 dB from 30 Hz to 15 kHz.

2.5 Measure the Total Harmonic Distortion (THD) level at the Amp 1 OUT jack. It should be 0.25% max at 1 kHz and 1.5% max at 15 kHz.

2.6 Move the shorting plug from the Amp 2 IN jack to the Amp 1 IN jack and repeat steps 2.1 to 2.5 for the channel 2 Mic input.

Test Procedures

3. Channel 1 and 2 Mic Input Signal to Noise Ratio (Dynamic Range) Tests

3.1 Place a 1/4• mono shorting plug into the

Amp 2 IN and Amp 3 IN jacks on the right hand side of the input/output panel. This will disable the channel 2 and 3 amplifiers while testing the channel 1 amplifier.

3.2 On the left hand side of the input/output panel, set the channel 1 Mic Trim control to the 6 setting. Ensure that the Phantom Power push button is not pushed in.

3.3 Using a balanced XLR male input cable, apply a 1 kHz, -30 dBV signal to the channel 1 input.

3.4 Reference a dB meter to the output level at the Amp 1 OUT jack. Remove the input signal and measure the A-Weighted output level. It should be -80 dB minimum.

3.5 Move the shorting plug from the Amp 2 IN jack to the Amp 1 IN jack and repeat steps 3.1 to 3.4 for the channel 2 Mic input.

4. Channel 1 and 2 Mic Input Phantom Power Test

4.1 Plug an XLR connector into the channel

1 Mic input. Do not connect any cables to the channel 1 or channel 2 Mic inputs. Power on the unit.

4.2 Press the channel 1 phantom power switch. Verify that the LED lights. Using a DMM, measure the DC voltage level across pins 1 and 2 of the XLR connector. Verify that the DC level is +24Vdc

+ 1Vdc relative

to pin 1.

4.3 Measure the DC voltage level across pins 1 and 3 of the XLR connector. Verify that the DC level is +24Vdc + 1Vdc relative to pin 1.

4.4 Repeat steps 4.1 to 4.3 for channel 2.

5. Channel 1 and 2 Line Input Gain Tests

5.1 Place a 1/4• mono shorting plug into the

Amp 2 IN and Amp 3 IN jacks on the right hand side of the input/output panel. This will disable the channel 2 and 3 amplifiers while testing the channel 1 amplifier.

5.2 On the left hand side of the input/output panel, set the channel 1 Mic Trim control to the 6 setting. Ensure that the Phantom Power push button is not pushed in.

5.3 Using an unbalanced 1/4• phono jack input cable, apply a 1 kHz, -10 dBV signal to the channel 1 input.

5.4 Reference a dB meter to the input level. Measure the gain output at the Amp 1 OUT jack. It should be +28.5 dB

+ 4 dB.

5.5 On the signal generator, turn the input level all the way down. Verify that the channel 1 Signal/OL LED is off. Increase the signal generator level. Verify that the LED lights green. Increase the signal level again and verify that the LED lights red. Note: You may have to increase the Mic Trim level on the PS1 channel 1 input as well to get the LED to light red.

5.5 Move the shorting plug from the Amp 2 IN jack to the Amp 1 IN jack and repeat steps 5.1 to 5.5 for the channel 2 Line input.

6. Channel 1 and 2 Line Input Frequency Reponse and Distortion Tests

6.1 Place a 1/4• mono shorting plug into the

Amp 2 IN and Amp 3 IN jacks on the right hand side of the input/output panel. This will disable the channel 2 and 3 amplifiers while testing the channel 1 amplifier.

6.2 On the left hand side of the input/output panel, set the channel 1 Mic Trim control to the 6 setting. Ensure that the Phantom Power push button is not pushed in.

6.3 Using an unbalanced 1/4! phono jack input cable, apply a 1 kHz, -10 dBV signal to the channel 1 input.

6.4 Use an 80 kHz low-pass filter on your measuring equipment. Reference a dB meter to the input level. Measure the frequency response at the Amp 1 OUT jack. It should be 0 dB

+ 3 dB from 30 Hz to

15 kHz.

6.5 Measure the Total Harmonic Distortion (THD) level at the Amp 1 OUT jack. It should be 0.25% max at 1 kHz and 1.5% max at 15 kHz.

6.6 Move the shorting plug from the Amp 2 IN jack to the Amp 1 IN jack and repeat steps 6.1 to 6.5 for the channel 2 Line input.

7. Channel 1 and 2 Line Input Signal to Noise Ratio (Dynamic Range) Tests

7.1 Place a 1/4! mono shorting plug into the

Amp 2 IN and Amp 3 IN jacks on the right hand side of the input/output panel. This will disable the channel 2 and 3 amplifiers while testing the channel 1 amplifier.

7.2 On the left hand side of the input/output panel, set the channel 1 Mic Trim control to the 6 setting. Ensure that the Phantom Power push button is not pushed in.

7.3 Using an unbalanced 1/4! phono jack input cable, apply a 1 kHz, -10 dBV signal to the channel 1 input.

7.4 Reference a dB meter to the output level at the Amp 1 OUT jack. Remove the input signal and measure the A-Weighted output level. It should be -80 dB minimum.

7.5 Move the shorting plug from the Amp 2 IN jack to the Amp 1 IN jack and repeat steps 7.1 to 7.4 for the channel 2 Line input.

Test Procedures

8. Channel 3 and 4 Line Input Gain Tests

8.1 Place a 1/4! mono shorting plug into the

Amp 1 IN and Amp 2 IN jacks on the right hand side of the input/output panel. This will disable the channel 1 and 2 amplifiers while testing the channel 3 amplifier.

8.2 On the left hand side of the input/output panel, set the channel 3 Level control to the 6 setting.

8.3 Using an unbalanced 1/4! phono jack input cable, apply a 1 kHz, -20 dBV signal to the channel 1 input.

8.4 Reference a dB meter to the input level. Measure the gain output at the Bass/Amp 3 OUT jack. It should be +40.1 dB

+ 3 dB.

8.5 Repeat steps 8.1 to 8.4 for the channel 4 Line input.

9. Channel 3 and 4 Line Input Frequency Reponse and Distortion Tests

9.1 Place a 1/4! mono shorting plug into the

Amp 1 IN and Amp 2 IN jacks on the right hand side of the input/output panel. This will disable the channel 1 and 2 amplifiers while testing the channel 3 amplifier.

9.2 On the left hand side of the input/output panel, set the channel 4 Mic Trim control to the 6 setting.

9.3 Using an unbalanced 1/4! phono jack input cable, apply a 1 kHz, -20 dBV signal to the channel 1 input.

9.4 Use an 80 kHz low-pass filter on your measuring equipment. Reference a dB meter to the input level. Measure the frequency response at the Amp 1 OUT jack. It should be 0 dB + 3 dB from 30 Hz to 15 kHz.

9.5 Measure the Total Harmonic Distortion (THD) level at the Amp 1 OUT jack. It should be 0.25% max at 1 kHz and 1.5% max at 15 kHz.

9.6 Repeat steps 9.1 to 9.5 for the channel 4 Line input.

10. Channel 3 and 4 Line Input Signal to Noise Ratio (Dynamic Range) Tests

10.1 Place a 1/4! mono shorting plug into

the Amp 1 IN and Amp 2 IN jacks on the right hand side of the input/output panel. This will disable the channel 1 and 2 amplifiers while testing the channel 3 amplifier.

10.2 On the left hand side of the input/ output panel, set the channel 3 Level control to the 6 setting.

10.3 Using an unbalanced 1/4! phono jack input cable, apply a 1 kHz, -10 dBV signal to the channel 1 input.

10.4 Reference a dB meter to the output level at the Bass/Amp 3 OUT jack. Remove the input signal and measure the AWeighted output level. It should be -80 dB minimum.

10.5 Repeat steps 10.1 to 10.4 for the channel 4 Line input.

11. Channel 1 and 2 Remote Control, Preset Switch and Insert Function Tests

11.1 Connect the PS1 power stand to a

known good L1 line array. Set the channel 1 preset switch to 00. Connect the remote control to the unit using the remote control MIDI cable supplied with the PS1.

11.2 Connect an analog audio source to the Channel 1 line input 1/4 inch jack. This source can be a CD player with a music disc.

11.3 Adjust the trim level so that the LED is lit mostly green. The audio should sound normal.

Test Procedures

11.4 With the audio playing, change the

channel 1 preset to 97 and back to 00. The channel should mute gracefully when the preset switch is operated. The audio should fade back in again about a second after the switch has stopped operating. Note: Preset 97 is a 1 kHz band pass (telephone-type sound). Preset 00 should sound normal.

11.5 Operate all channel 1 controls on the remote (high, mid, low, volume and master volume). All tone controls should have a clearly audible effect and operate smoothly. Channel volume may display a little "zipper! noise, which is normal.

Note: Channel volume all the way down does not mute the channel, but the output level should be very low. There is a small, but noticeable time delay between operating the control and the audible effect. This is normal. The master volume control should operate smoothly without any artifacts.

11.6 Insert a 1/4 inch phono jack all the way into the channel 1 Insert jack. The audio should sound normal.

11.7 Insert a 1/4 inch phono jack into the channel 3 Line IN jack and operate the volume control on the power stand. The audio should sound normal.

11.8 Repeat steps 11.1 to 11.7 for the channel 2 input.

12. Channel 1 Send, Line Output and Digital Output Tests

Note: For these tests you will need an

external device that can accept both 1/4 inch and XLR inputs. A small mixer, such as a Mackie or Behringer with headphones connected works well for this. The master volume control on the PS1#s remote control should be set all the way down to mute all sound coming from the unit under test.

Test Procedures

12.1 Connect the PS1 power stand to a

known good L1 line array. Set the channel 1 preset switch to 00. Connect the remote control to the unit using the remote control MIDI cable supplied with the PS1.

12.2 Connect an analog audio source to the Channel 1 Line IN 1/4 inch jack. This source can be a CD player with a music disc.

12.3 Adjust the trim level so that the LED is lit mostly green. The audio should sound normal.

12.4 Insert a 1/4 inch plug halfway into the channel 1 Insert jack. The audio should sound normal.

12.5 Connect the PS1 channel 1 XLR Line OUT jack to the XLR input of the mixer. The audio should sound normal.

Note: The PS1 puts out a “professional” +4dBu level. You may have to turn the the input trim control on the mixer all the way down to prevent overloading the signal and distorting it.

12.6 Connect the Data Out jack of the PS1 to a device that accepts a 48 kHz S/PDIF data stream. The audio should sound normal.

13. Power Amplifier Tests

13.1 Connect the PS1 power stand to a

known good L1 line array. Set the channel 1 preset switch to 00. Connect the remote control to the unit using the remote control MIDI cable supplied with the PS1.

13.2 Connect an analog audio source to the Amp 1 IN 1/4 inch phono jack. This source can be a CD player with a music disc.

13.3 Verify that the audio comes from the upper section of the L1 line array. The audio should sound clean and undistorted.

13.4 Connect the audio source to the Amp 2 IN 1/4 inch phono jack. Verify that the audio comes from the lower section of the L1 line array. The audio should sound clean and undistorted.

13.5 Connect a B1 bass module to the PS1 power stand at the Bass/Amp 3 OUT jack. Connect the audio source to the Amp 3 IN 1/4 inch phono jack. Sound should come from the bass module only and be clean and undistorted.

13.6 Connect the audio source to the All Amps IN 1/4 inch phono jack. Sound should come from both of the L1 line array sections and the bass module simultaneously. The audio should be clear and undistorted.

14. High SPL System Sweep Test

CAUTION: This test will be extremely loud.

Hearing protection is advised.

14.1 Connect a R1 remote control to the PS1 power stand under test. Set the channel 1 controls to mid-level. Set the master volume control on the remote to the 1 o’clock position. Set the channel 1 Mic Trim control on the PS1 to 6. Connect a L1 line array to the PS1. Connect a B1 bass module to the PS1.

14.2 Connect a signal generator to the channel 1 input on the PS1. Adjust the signal generator and/or trim control so that the Signal/OL LED is just below red.

14.3 Sweep the input frequency from 40 Hz to 14 kHz. Listen for any unusual noises and excessive distortion or drop-outs.

15. Bass Module Auto-EQ Test

15.1 Connect a L1 line array to the PS1

power stand. Connect an R1 remote control to the power stand. Connect a B1 bass module to the Bass/Amp 3 OUT jack on the power stand. Connect an audio source to the channel 1 and 2 inputs of the power stand.

Test Procedures

15.2 Set the channel 1 and 2 level controls

to identical settings so that both LEDs are mainly green.

15.3 While the audio is playing, disconnect the B1 bass module from the power stand. The system should mute and un-mute and audio should resume. The audio should sound normal, but not punchy (no deep bass).

15.4 Plug a dummy 1/4 inch phono jack into the Bass Line Out jack. The system should mute and un-mute again, but the audio should sound thinner than before.

15.5 Remove the dummy plug. The system should mute and un-mute and the audio should sound normal again.

15.6 Re-connect the B1 bass module to the power stand. The audio should mute and unmute again and sound normal.

15.7 Connect a second B1 bass module to the first one. The audio should mute and unmute. The audio will sound very similar to having only one bass module attached. Disconnect the second bass module. The system should mute and un-mute and the audio should sound normal again.

L1 Line Array Tests

Set up the unit under test as shown below.

1. Air Leak Test

1.1 Apply a 100 Hz, 10 Vrms sine wave to

the unit under test.

1.2 Listen carefully for air leaks from around the end cap, the transducers and the grille. Air leaks will be heard as a hissing or sputtering sound. All repairs must be hidden. Test duration should be 5 seconds minimum.

2. Transducer Rub and Tick Test

2.1 Remove the transducer you wish to test

using the disassembly procedures in this manual. Do not unplug the wires at the transducer assembly terminals.

2.2 Connect a signal generator directly to the terminals of the transducer assembly under test.

2.3 Apply a 20 Hz, 5 Vrms signal to the transducer assembly.

2.4 Listen carefully for any extraneous noises such as rubbing, scraping or ticking.

Note: To distinguish between normal suspension noise and rubs or ticks, displace the cone slightly with your fingers. If the noise stays the same, it is normal suspension noise and the driver is good. Suspension noise will not be heard with program material.

3. Transducer Phase Test

3.1 Apply a DC voltage of 10V, positive

applied to the positive tab of the dual banana jack on the line array test cable and negative applied to negative (gnd) tab.

3.2 All of the driver cones should move outward when the DC voltage is applied.

3.3 Rewire any incorrectly connected transducers.

Power Amplifier

INPUT OUTPUT

Audio Signal

Generator

Upper or Lower L1 Line Array

Upper or Lower L1 Line Array Test Cable

Test Procedures

Power Amplifier

INPUT OUTPUT

Audio Signal Generator

B1 Bass Module Test Cable

B1 Bass Module

4. L1 Line Array Sweep Test

4.1 Set up the upper or lower line array

section as shown in the figure on the previous page.

4.2 Apply a 100 Hz, 10 Vrms sine wave to the input.

4.3 While listening to the output of the system, sweep the input frequency slowly from 100 Hz to 15 kHz.

4.4 Listen carefully for any extraneous noises such as buzzing and ticking.

B1 Bass Module Tests

Set up the unit under test as shown below.

1. Air Leak Test

1.1 Apply a 100 Hz, 20 Vrms sine wave to

the unit under test.

2. Transducer Rub and Tick Test

2.1 Remove the transducer you wish to test

using the disassembly procedures in this manual. Do not unplug the wires at the transducer assembly terminals.

2.2 Connect a signal generator directly to the terminals of the transducer assembly under test.

2.3 Apply a 10 Hz, 10 Vrms signal to the transducer assembly.

2.4 Listen carefully for any extraneous noises such as rubbing, scraping or ticking.

3. Transducer Phase Test

3.1 Apply a DC voltage of 20V, positive

applied to the positive tab of the dual banana jack on the bass module test cable and negative applied to negative (gnd) tab.

3.2 Notice carefully that all driver cones should move outward when the DC voltage is applied.

3.3 Rewire any incorrectly connected transducers.

4. System Sweep Test

4.1 Set up the system as shown in the

figure at left.

4.2 Apply a 10 Hz, 20 Vrms sine wave to the input.

4.3 While listening to the output of the system, sweep the input frequency slowly from 10 Hz to 400 Hz.

4.4 Listen carefully for any extraneous noises such as buzzing and ticking.

1 2

321

L603

3.8mH

L604

1mH

C601

1uF 300V

C602

1uF 300V

C604

1n5

C603

1n5

R601

220K 3W

DB601

MB354S

R603

100K 1/2W

R604

100K 1/2W

ACGND

F601

15A 125VAC

C607

2200uF 200V

C608

2200uF 200V

SW601

20A 125V

C606

1n5

C605

1n5

CN601

IEC

1 2

TH601

SCK2R515

V+

EGND

( Earth GND)

1 2

TH602

SCK2R515

(16A)

L602

3.8mH

(16A)

VDR601

14D271K

L601

CN602

DT-4-3P

(CN603,605,607,609)

(CN604,606,608,610)

ACGND

(TO AUX PS AND +/-27V PS)

70uH 6Ts

PS1 Power Stand

FCC Filter PCB, Rev. F

P/N:

275436

Sheet 1 of 1

120V Version 1.0 Systems

1 2 3 4

321

L603

3.8mH

L604

1mH

C601

1uF 300V

C602

1uF 300V

C604

1nF

C603

1nF

R601

220K 3W

DB601

GL3506

R603

100K 1/2W

R604

100K 1/2W

ACGND

F601

10A 250VAC

C607

2200uF 200V

C608

2200uF 200V

SW601

15A 250V

C606

1nF

C605

1nF

CN601

IEC

TH601

SCK0512

V+

EGND

( Earth GND)

TH602

SCK0512

(16A)

L602

3.8mH

(16A)

VDR601

14D471K

L601

CN602

DT-4-3P

(CN603,605,607,609)

(CN604,606,608,610)

ACGND

(TO AUX PS AND +/-27V PS)

70uH,6Ts

PS1 Power Stand

FCC Filter PCB, Rev. F

P/N: 283370

Sheet 1 of 1

120V Version 1.1 Systems

+ 39 hidden pages