Philips DVDR880/001 Service Manual page 73

5.5.1 Nucleus 900: Digital Audio Loop
This nucleus tests the audio path through the digital board
NUCLEUS 900: AUDIO LOOP DIGITAL
ANALOGUE BOARD
DIGITAL BOARD
7500
VIP
VIP ICLK 27MHz
EMPRESS
GND
Figure 5-9
7200
STI 5508
7403 7100
VSM
TR 01008_001
080502
Diagnostic Software DVDR880-890 /0X1
5.5.2 Nucleus 901: Audio User Dealer Loop
This Nucleus is only possible in NAFTA sets.
A PCM audio sine of 12kHz is generated in the Host Decoder
for a while and sent to the analogue board. The signal coming
from the analogue board is encoded again and sent to the
memory of the host decoder for comparison. This nucleus tests
the components on the audio signal path:
• Host decoder
• Flex connection between connector 1602 (digital board)
and connector 1900 (analogue board)
• DAC
• Op-amp
• Scart switch IC
• ADC
• Audio Encoder
• VIP
• VSM
ANALOGUE BOARD
DIGITAL BOARD
VIP
5.
NUCLEUS 901: AUDIO USER DEALER LOOP
7501 7600
HEF4052 MSP34xx
7002
7004
ADC
connector
1900
connector
1602
I2S
7500
7403
EMPRESS
Figure 5-10
EN 75
7001
DAC
connector
1900
connector
1602
I2S
7200
STI 5508
7100
VSM
TR 01009_001
080502