Repair tips
Hum in loudspeaker when no music is played
The Power Link cable must be of type MK III or higher.
The ground connection in Power Link cable lower than MK III may be insufficient
for optimum sound performance.
Power Link
MK III
Check loudspeaker units
The loudspeaker units can be checked by an ohm-meter.
OK values for tweeter and woofer are approx. 6
W
.
How to check the Switch Mode Power Supply
- Take off the baffle.
- Connect an audio signal (set the input switch corresponding to the applied signal).
- Connect mains, 100 - 240V.
- Confirm 12V standby on PCB02, SMPS P2 pin 6, GND pin 3 (if not OK, replace
PCB02, SMPS).
- Confirm 12V HT_ON, on PCB02, SMPS P2 pin 8 (if not OK replace PCB03, Main
PCB).
- Confirm ±12V on PCB02, SMPS P2 +12V pin 1, 2 and -12V pin 4, 5 (GND pin 3).
If not OK replace PCB02, SMPS.
Repair tips 4.1
Summary of Contents for Beolab 4000 MKII 6642
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Page 11: ...5 BeoLab 4000 MKII in service position Remove cables for speaker units ...
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Page 26: ...Bang Olufsen DK 7600 Struer Denmark Phone 45 96 84 11 22 Fax 45 97 85 39 11 3538061 03 07 ...