Philips FR975 Service Manual page 46

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MULTI-CHANNEL DECODING MODULE - Troubleshooting
To start service test
program hold
Bass & Treble depressed
while switching
the mains on
Connect CD player to Optical 1 In
Play track 15 of
*Audio SignalsTest Disc 1
Can sound be heard on ALL
Press Virt. Mode
Connect CD player to Optical 2 In
Play track 15 of
*Audio SignalsTest Disc 1
Can sound be heard on ALL
PCS 102 496
Virt. Mode
Button pressed?
Yes
Does the MDM SW-version
appear in the screen?
Yes
Virt. Mode
Button pressed?
Yes
Connect CD player to Coax 1
Play track 15 of
*Audio SignalsTest Disc 1
Yes
Can sound be heard on ALL
Channels ?
Yes
Virt. Mode
Button pressed?
Yes
Connect CD player to Coax 2
Play track 15 of
*Audio SignalsTest Disc 1
Yes
Can sound be heard on ALL
Channels ?
Yes
Press Virt. Mode
Button
Yes
Use a CD-player with
an optical digital out
Yes
No
Replace MDM
Channels ?
Yes
Button
Yes
Use a CD-player with
an optical digital out
Yes
No
Replace MDM
Channels ?
Yes
07/08/2012
8-2
MDM
TEST
No
Is 6V5 present on pin 6 conn. 1802?
No
Is +12V present on pin 11 conn. 1802?
Is -12V present on pin 12 conn. 1802?
At this moment the MDM module
is set to "Service mode"
Use a CD-player with
a coaxial digital out
No
Replace MDM
module
No
Replace MDM
module
module
Can sound be heard on ALL
Does a valid SPDIF -signal,
containing a sine-wave of 1kHz
module
World of Free Manuals
Check the relevant
No
components of the
missing voltage on
the monoboard
Yes Replace MDM
module
SPDIF - Sony Philips Digital Inter Face
*Audio Signals Test Disc 1 = SBC429
4822 397 30184
Press Virt. Mode
Button
Yes
Yes
Connect CD player to the
Analog CD-input
Play track 15 of
*Audio SignalsTest Disc 1
Yes
No
Channels ?
Yes
No
appear on the coax out?
Yes
MDM is working properly
Replace MDM
module
Replace MDM
module