Pioneer AVIC-X940BT, Руководство по обслуживанию

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AVIC-X940BT/XNUC
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5 6 7 8
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C
D
F
A
B
E
Check 14: Is USB Circuit OK?
<Outline>
The data is transmitted through D+, D- and SDA of HOST I/F while playing USB/IPOD.
USB memory uses only D+ and D-, but IPOD uses SDA (DATA) and SCL (CLOCK) in addition to D+ and D-.
CN1952
HOST I/F
Fig. 14-1: USB Circuit
<Check Method>
1. USB Memory: Play a song from USB memory and check D+ and D- with the DGND1 standards.
2. iPod: Connect iPod and check CP_RESET, SDATA and SCLOCK with the DGND1 standards until the Pioneer log
appears. When iPod Touch or iPhone is connected, the logo is not displayed but only a check mark is displayed.
Play a song from iPod and check D+/D- with the DGND1 standards.
When it does not conform to the standards, check appropriate line, main parts shown in the above figure,soldering of
peripheral parts and malfunctions in parts.
No. Checking spot (stylus) Standard value 2
1 CP_RESET
2
SDATA
VCC33*0.7 or more VCC33*0.2 or less *Until the pioneer log appears after connecting the iPod
3 SCLOCK VCC33*0.7 or more VCC33*0.2 or less
*Until the pioneer log appears after connecting the iPod
4 D+ VCC33*0.7 or more VCC33*0.3 or less
5 D- VCC33*0.7 or more VCC33*0.3 or less
Fig.14.2: USB Circuit Communication Wave
Side A
VCC33*0.7 or more
IC1501
DVD-LSI
D-
D+
I2C_SCL
I2C_SDA
CP_RESET
Standard
value 1
Standard
value 2
DGND
SCLOCK
SDATA
D-
CP_RESET
D+ DGND1
Standard value 1