Philips LX9000R Service Manual page 82

Circuit Diagrams and PWB Layouts
MULTI-CHANNEL DECODING MODULE
MDM 2000 derivation for LX9000R
TABLE OF CONTENT
Trouble shooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81
Assembly drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82
Partslist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82
LX9000R 7. EN 82
MULTI-CHANNEL DECODING MODULE - Troubleshooting
Start Service Test Program.
Hold Open/Close button
depressed while plugging
mains cord in.
Then press
and select
S
MDM
twice
MDM TEST
.
TEST
No
PLAY
Button pressed?
Yes
No
Display shows SW-version
of µP 7711.
Yes
Press PLAY
Button.
Is 5V present on pin 6 conn. 1802?
No
Display shows SW-version
Is +12V present on pin 11 conn. 1802?
of DSP 7705.
Is -12V present on pin 12 conn. 1802?
Yes
At this moment the MDM module
Press PLAY
is set to "Service mode"
Button.
Yes
Display shows Replace MDM
MDM error? module
No
Connect CD player to Line 1
Play track 15 of
*Audio SignalsTest Disc 1
Yes
Yes
Display shows Replace MDM
LIN error? module
No
No Replace MDM
Can sound be heard on ALL
module
Channels ?
Yes
Press PLAY
Button.
Connect CD player to Dig in
Use a CD-player with
Play track 15 of
a coaxial digital out
*Audio SignalsTest Disc 1
Yes
Yes
Display shows Replace MDM
DIG error? module
No
No
Replace MDM
Can sound be heard on ALL
module
Channels ?
Yes
Press PLAY
Button.
Check the relevant
components of the
No
missing voltage on the
Power supply boards
and ASP board.
Yes
Replace MDM
module
SPDIF - Sony Philips Digital Inter Face
*Audio Signals Test Disc 1 = SBC429
4822 397 30184
Connect CD player to
Use a CD-player with
Optical In
Play track 15 of an optical digital out
*Audio SignalsTest Disc 1
Yes
Yes
Display shows Replace MDM
OPT error? module
No
No Replace MDM
Can sound be heard on ALL
module
Channels ?
Yes
Does a valid SPDIF -signal,
No Replace MDM
containing a sine-wave of 1kHz
module
appear on the Dig out?
Yes
MDM is working properly
troubleshootMDM2000, 140603