Yamaha DRX-1 Service Manual page 40

DRX-1
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.
NUCLEUS 907: VIDEO VBI USER DEALER LOOP
ANALOGUE BOARD
1954
connector
1601
connector
DIGITAL BOARD
7500
VIP
VIP_ICLK: 27MHz
40
7507
STV6410
1954
connector
1601
connector
7200
STI 5508
7100
7403
VSM
EMPRESS
Fig. 16
5.9 Nucleus 908: System Audio Loop Scart (Europe)
Nucleus for testing the components on the audio signal
path:
• The hostdecoder
• The analogue board
• The audio encoder
• The VSM
On the analogue board, audio is passed to the SCART
connector, where a SCART cable needs to be used to loop
back the audio signal to the digital board.
NUCLEUS 908: SYSTEM AUDIO LOOP SCART
SCART AUX
ANALOGUE BOARD
STV6410
7004
ADC
1900
connector
1602
connector
DIGITAL BOARD
7500
VIP
VIP_ICLK: 27MHz
EMPRESS
Fig. 17
SCART TV
7507
7002
7100
DAC
1900
connector
1602
connector
7200
STI 5508
7403
7100
VSM