Led Indicator Is Flashing Quickly Orange - Bang & Olufsen BeoLab 18 Service Manual

2.8 Fault flow chart
Fault symptom:

LED indicator is flashing quickly orange

(The product is in protection mode)
Possible causes:
Defective PCB30, Digital Sound Engine
Defective PCB35, Amplifier
Defective PCB48, NTC Tweeter
Defective PCB48, NTC Woofer
Defective speaker unit
Disconnect product
from mains, wait 2
minutes and
reconnect to mains
OK?
Tip
Use ServiceTool to read out
Error Log.
Replace the suspected module
related to the Error Log
**
Board temperature - PCB30, Digital Sound Engine
Power Supply temperature - PCB04, Power Supply
Amplifier temperature - PCB35, Amplifier
Connect ServiceTool
and read out product ID.
Confirm all product ID data
is correct.
OK?
Read out the Replace the
temperature ** suspected module
related to the high
Seems normal? temperature
Read out the
resistance of the tweeter
temperature of the
(wires disconnected):
tweeter
Tweeter = 6.3Ω ± 0.6Ω
Seems normal?
Read out the
resistance of the woofer
temperature of the
(wires disconnected):
woofer
Woofer = 11.2Ω ± 1.2Ω
Seems normal?
Replace PCB35,
Use ServiceTool to
calibrate the new
Perform an
autocalibration.
Make an
ID Restore.
Type in all product
ID data from the
product label
Measure the DC
Replace defective
Use ServiceTool to
calibrate the new
OK?
Measure the DC Replace defective
Use ServiceTool to
calibrate the new
OK?
Amplifier
module
Disconnect the product
Disconnect PCB48, P1 on tweeter
and woofer and confirm 470kΩ at
OK?
PCB48, NTC P1 pin 1-2
Replace PCB30,
Digital Sound
Engine
Yes
tweeter
speaker unit
Replace PCB35,
woofer Amplifier
Use ServiceTool to
calibrate the new
speaker unit module
from mains.
OK?
Survey of plugs and pins - see page 2.13
No
Replace defective
PCB48, NTC