Audio Problems - InFocus LP340B Service Manual

Audio Problems

on the controller ECA. See the Controller Voltage Diagram.
If speaker sounds bad
it may be a bad speaker cone.
Substitute good speaker.
Sound
good?
No
Replace
controller ECA.
LP340/340B/350 Service Manual
No audio or sound is scratchy or distorted.
Turn projector off.
Check speaker resistance across J-500
it measure
Yes
12 to 14
ohms?
Does
No
Replace speaker
A shorted speaker can damage the
audio amp on the controller ECA.
Run the projector with audio for 30 minutes.
If the problem returns, replace both the
controller ECA and the speaker if the resistance
across J-500 no longer measures 8 ohms.
Measure
Replace
less than
No
speaker.
6 ohms?
Yes
But note
101