Bose Companion 3 Series II Panduan Servis - Halaman 32

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Halaman Cetak

Bose Companion 3 Series II Panduan Servis

Product

No Audio

Companion 3

series II

No Bass

Companion 3

series II

Intermittent Audio

from Left or Right

Speakers

Companion 3

series II

No Audio or Dead

Unit

Companion 3

series II

Troubleshooting Tips, continued

Symptom

Make sure the unit isn't

stuck in standby

Check U3

Check J307

Check the Control Pod

Check

At IC U301, place your positive

probe on pin 22 and the negative

probe on ground. Toggle the

control pod between mute and

standby by touching the top of the

control pod. When the LED is

green, the voltmeter should read

11Vdc. When the LED is yellow,

the voltmeter should read 0Vdc.

Insert a 200 mVrms, 200Hz signal

into J302. Check U3, pin 10 for a

signal going into the IC and check

pin 14 for the signal coming out. If

there is a signal going in but nothing

coming out, replace U3 using the

part number in the Service Manual.

With the speakers connected and

an audio source playing, wiggle the

speaker connections and listen to

see if the audio cuts out or

becomes intermittent. Before

determining the connectors as a

failure, be sure to inspect the

speaker cable for broken or

intermittent connections. J302 is

non-repairable; Replace the module

assembly.

Check the pins inside the din

connector at the end of the control

pod cable to see if any pins a

misshaped, bent or broken. Also,

inspect J308 to make sure none of

the pins has broken off. If the

control pod connector is defective,

replace it.

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