Bang & Olufsen BeoPlay V1-40, Service Manual

Page: 27 / 74

Fault flow chart 3.11
No
Yes
Confirm voltages:
on PCB35
(left), P1
pin 4+5 = +12V
pin 6+7 = GND
pin 8+9 = -12V
or similar test points
on PCB04, P3
pin 1+2 = +12V
pin 3+4 = GND
pin 5+6 = -12V
All OK?
Replace cable or
re-establish
connection
Sound OK?
Check cables
between
PCB35
(left), P1 and
PCB04, P4
OK?
Replace PCB04,
Power Supply Unit
** Acceptable ohmic
speaker values:
Full range: 3.6 Ω ±0.5Ω
Woofer: 6.4 Ω ±1Ω
Warning:
Be very careful when measuring on the output to a loudspeaker, as there is
approx. 35 VDC on both terminals.
Make sure to use a differential probe, or that the oscilloscope and the product
are not connected to earth/ground.
Disconnect cable from PCB35, P1.
Confirm voltages on: PCB04, P3
pin 1+2 = +12V
pin 3+4 = GND
pin 5+6 = -12V
OK?
Hint:
Measurement
plugs, pins and test
points;
see page 3.17
Check cable
between
PCB01, P130 and
PCB35, P1
(left)
OK?
Confirm voltage:
DSE_OUTPUT1_N
on PCB01, P130
pin 7 = +12V
OK?
Confirm voltage on
PCB01, P130 pin 1 SPK_IN_1P approx. = +5V
(tweeter) and
PCB01, P130 pin 4 SPK_IN_2P approx. = +5V
(left woofer)
OK?
Replace PCB01,
Video Engine
Replace PCB35,
ICEpower Amplifier.
Sound OK?
Replace the
left speaker
**
Replace PCB35,
ICEpower Amplifier
left
Sound OK?
Replace cable or
re-establish
connection
Disconnect cable
from PCB01, P130.
Confirm voltage on
PCB35 P1 pin 3
Monitor out ch1/
Disable = 12V
OK?
From page
3.11