Philips DVDR880/001 Service Manual page 76

EN 78 5. DVDR880-890 /0X1
5.5.7 Nucleus 906: Video User Dealer Loop
Nucleus for testing the components on the video signal system
path:
• The VIP
• The video encoder
• The VSM
• The host decoder
• The analogue board
On the analogue board, the video signal is internally routed
back to the digital board.
ANALOGUE BOARD
connector
1947
connector
1601
DIGITAL BOARD
7500
VIP
VIP_ICLK: 27MHz
Figure 5-15
Diagnostic Software
NUCLEUS 906: VIDEO USER DEALER LOOP
7408
STV6618
connector
1947
connector
1601
7200
STI 5508
7403 7100
EMPRESS VSM
TR 01014_001
5.5.8 Nucleus 907: Video VBI User Dealer Loop
This nucleus tests the components on the video VBI signal
path:
• The VIP
• The VSM
• The Host Decoder
The signal is routed back internally on the analogue board
Remark: this test is only successful if nucleus 121 is carried out
first.
080502
NUCLEUS 907: VIDEO VBI USER DEALER LOOP
ANALOGUE BOARD
7408
STV6618
connector
1947
connector
1601
DIGITAL BOARD
7500
VIP
VIP_ICLK: 27MHz
7403
EMPRESS
Figure 5-16
connector
1947
connector
1601
7200
STI 5508
7100
VSM
TR 01015_001
080502