Bose Panaray LT MB12 III Servis Kılavuzu - Sayfa 21

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Bose Panaray LT MB12 III Servis Kılavuzu

3. Input Panel Removal

3.1 Using a Phillips-head screwdriver, re-

move the 8 screws that secure the input

panel to the enclosure. Lift the input panel

out of the enclosure.

Test Cables for Model 3202

9402

, 9702

and MB24 III Loudspeakers

You will need to make up a test cable in order

to be able to perform the tests below.

Parts Needed:

1 - Neutrik Speakon NL4FX 4-pole connector

(4402, 9402 and 9702 speakers)

1 - Neutrik Speakon NL8 8-pole connector

(3202 speaker)

1 - Dual banana jack

6 feet of 16-18 AWG twisted pair wire

Connect one lead of the twisted pair wire to

the positive tab of the dual banana jack.

Connect the other lead to the GND tab of the

dual banana jack.

Connect the positive lead of the wire to

the 1+ position of the Neutrik connector.

Connect the negative lead of the wire to the

1- position of the Neutrik connector. Refer

to the appropriate drawing for the speaker

below.

16-18AWG

twisted pair wire

Neutrik Speakon

4 pole connector

(back shown)

Model 4402, 9402, 9702, MB24 and MB12

Series III Speaker Test Cable

Dual banana jack

16-18AWG

twisted pair wire

GND

Model 3202 III Speaker Test Cable

TEST PROCEDURES

, 4402

GND

Dual banana jack

Neutrik Speakon

8 pole connector

(back shown)

Panaray

LT Model 3202

and 9702

Series III Loudspeakers

Note: Ensure that the speaker under test

is in PASSIVE mode for the following tests.

To check the mode the speaker is set up to

operate in, you will need to remove the four

screws that secure the input panel assembly

in place and verify that the jumpered connec-

tor plugged into the crossover PCB is in the

PASSIVE jack. Refer to the disassembly

procedures in this service manual for in-

structions on how to remove the input panel.

1. Rub and Tick Test

1.1 Apply an 8 Vrms, 10 Hz signal to the

input terminals of the speaker.

1.2 No extraneous noise such as rubbing,

scraping or ticking should be heard.

2. Phase Test

2.1 Disconnect the connectors at the VEE-2

terminals. Momentarily apply 8 Vdc + 1 Vdc

to the terminals, observing polarity when

connecting the DC power supply. Both of the

drivers should move outward when the DC

level is applied.

3. Frequency Power Sweep Test

3.1 Apply an 8 Vrms, 10 Hz signal to the

speaker input terminals.

3.2 Sweep the input frequency from 10 Hz

to 2 kHz.

3.3 Lower the applied input to 4 Vrms, and

sweep the input frequency from 2 kHz to 5

kHz.

3.4 Listen for any buzzes, rattles or other

extraneous noises from the loudspeaker.

, 4402

, 9402