Pioneer CX-3250 Service Manual page 79

5
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-.
IC1501
DVD-LSI
<Check Method>
1.USB Memory: Play a song from USB memory and check D+ and D- with the DGND standards.
2.iPod: Connect iPod and check CP_RESET, SDA and SCL with the DGND standards until the pioneer log appears.
Play a song from iPod and check D+/D- with the DGND 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. Standard value 1
Checking spot (stylus)
1 CP_RESET
2 SDATA VCC33*0.7or more
VCC33*0.7or more
3 SCLOCK
4 D+ VCC33*0.7or more
VCC33*0.7or more
5 D-
Standard value 2
Standard value 1
Fig. 14.2: USB Circuit Communication Wave
5
6
CP_RESE
I2C_SDA
I2C_SCL
D+
D-
DGND
Fig. 14-1: USB Circuit
Standard value 2
VCC33*0.7or more
VCC33*0.2 or less
VCC33*0.2 or less
VCC33*0.3 or less
VCC33*0.3 or less
AVIC-X930BT/XNUC
6
7
CN1901
HOST I/F
*Until the pioneer log appears after connecting the iPod
*Until the pioneer log appears after connecting the iPod
7
8
A
B
C
D
E
F
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