Pioneer AVH-P7950DVD/RC Service Manual page 52

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Check 9: Is DACCLK normal?
<Outline> DACCLK for Audio-DAC is created by IC1501 using the 27 MHz master crystal oscillator (X1501).
A
X1501
27 MHz
crystal
B
<Check method>
DVD: DVD-REF-A1 TITLE 1
CD: Playback a normal CDDA.
Common to all DVD-V compatible modules.
Check with DGND being the reference.
In case of NG, check the applicable line, the periphery of IC1501, soldering of the peripheral components and
defective components.
NO. Check point 1 (stylus)
1 DACCK
2 DACCK
Specification
C
value 1
GND
Side A
D
E
F
Fig 9.3: 27 MHz, DACCLK check point
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1
2
IC1501
DVD-LSI
VCC33 VCC12
Fig 9.1: Clock configuration
Media Specification value 1 Specification value 2
DVD 2.0 V~VCC33V
CD 2.0 V~VCC33V
Specification
Specification
value 2
value 3
Fig 9.2: Clock specification value
Check point 2 (IC1501 172 pin)
Check point 1 (stylus)
AVH-P7950DVD/RC
2
3
IC1801
Audio-DAC
DACCLK
DGND~0.8 V
DGND~0.8 V
3
4
Specification value 3
36.864 0 MHz ± 300 ppm
33.868 8 MHz ± 300 ppm
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