Philips DVDR890 Service Manual page 37

EN 76 5. DVDR880-890 /0X1
5.5.3 Nucleus 902: Digital Video Loop
A colourbar generated in the host decoder is looped through
the VIP, Empire, and VSM and checked again in the host
decoder. The following components are tested on the video
signal path:
• VIP
• Empire
• VSM
• Host decoder
ANALOGUE BOARD
DIGITAL BOARD
7500
VIP
VIP_ICLK: 27MHz
Figure 5-11
Diagnostic Software
NUCLEUS 902: DIGITAL VIDEO LOOP
7408
STV6618
7200
STI 5508
7403 7100
EMPRESS VSM
TR 01010_001
5.5.4 Nucleus 903: Digital Video VBI Loop
Nucleus for testing the components on the video VBI signal
path:
• The VIP
• The VSM
• The Host Decoder
This is done by using the internal test signal source (digital
board only)
Remark: this test is only successful if nucleus 121 is carried out
first.
ANALOGUE BOARD
DIGITAL BOARD
080502
NUCLEUS 903: DIGITAL VIDEO VBI LOOP
7408
STV6618
7500
VIP
VIP_ICLK: 27MHz
7403
EMPRESS
Figure 5-12
7200
STI 5508
7100
VSM
TR 01011_001
080502