Yamaha DRX-1 Service Manual page 38

DRX-1
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.
NUCLEUS 903: DIGITAL VIDEO VBI LOOP
ANALOGUE BOARD
DIGITAL BOARD
7500
VIP
VIP_ICLK: 27MHz
38
7507
STV6410
7200
STI 5508
7403 7100
VSM
EMPRESS
Fig. 12
5.5 Nucleus 904: System Video 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 will be routed to
the SCART (EUROPE) or CINCH (NAFTA). There it will
be looped back externally by means of the proper cable.
NUCLEUS 904: SYSTEM VIDEO LOOP
SCART AUX
ANALOGUE BOARD
STV6410
1954
connector
1601
connector
7500
DIGITAL BOARD
VIP
VIP_ICLK: 27MHz
7403
EMPRESS
Fig. 13
SCART TV
7507
1954
connector
1601
connector
7200
STI 5508
7100
VSM