Pioneer VSX-816-S Service Manual - Page 135

Step 3: Operation of USB Media control IC, IC701, IC953 5 V, CN702

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5 6 7 A 12 IC701 (pins 7,24,41,71,77,87,109,119) USB Media control IC Is the voltage 1.8 V ? No Check the parts and patterns in the path. Yes 13 IC771 (pin 1) USB Power SW output 8 A Is the voltage 5 V ? No Is pin 4 No Is pin 14 No Check the (CTL) of IC771 high? (CTL) of CN702 high? MOTHER Assy. B Yes Yes Yes Replace IC771. 14 CN701 (pin 1) USB Bus power Check the parts and patterns in the path. Is the voltage 5 V ? No Check the parts and patterns in the path. C Yes Power supply is OK. To STEP 3 Step 3: Operation of USB Media control IC Note: Please confirm it with the USB memory connected for the content. IC701 (pins 74,75) XIN/XOUT D Does the crystal oscillator No at 12 MHz Is XRST high? No XRST must be high during operation. Check the MOTHER Assy. ? Yes Yes Check the parts and patterns in the path. Replace X701, etc. Fig. 1 USCS/USCLK (Refer to Fig. 1 and 2) IC701 IC953 (5 V → 3 V) CN702 Are USCS and USCLK high? Yes No USCS and USCLK should be high during operation. Check the pattern in the path. Check the MOTHER Assy. Replace IC762, etc. XRST pin 72 pin 3 pins 1,2 pin 5 USCS pin 121 pin 11 pins 12,13 pin 9 E HREQ pin 122 pin 6 pins 4,5 pin 12 USDAI pin 118 pin 8 pins 9,10 pin 10 Fig. 2 IC701 IC951 (3 V → 5 V) CN702 USCLK pin 116 pins 4,5 pin 6 pin 7 B USDAO pin 115 pins 9,10 pin 8 pin 11 TREQ pin 123 pins 12,13 pin 11 pin 13 F VSX-816-K 135 5 6 7 8

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VSX-816-K
135
5
6
7
8
5
6
7
8
C
D
F
A
B
E
Step 3: Operation of USB Media control IC
Does the
crystal oscillator
at 12 MHz
?
Check the
MOTHER Assy.
Note:
Please confirm it with the USB memory connected for the content.
IC701 (pins 7,24,41,71,77,87,109,119)
USB Media control IC
12
Replace IC771.
Yes
Yes
Yes
Is pin 4
(CTL) of IC771
high?
Is
the voltage
5 V ?
No
Yes
Is
the voltage
1.8 V ?
Yes
Is pin 14
(CTL) of CN702
high?
No
No
Check the parts and
patterns in the path.
Check the parts and
patterns in the path.
No
CN701 (pin 1)
USB Bus power
14
Is
the voltage
5 V ?
Check the parts and
patterns in the path.
Power supply is OK.
To STEP 3
No
XRST must be high during operation.
Check the MOTHER Assy.
USCS and USCLK should be
high during operation.
Check the pattern in the path.
Check the MOTHER Assy.
Replace IC762, etc.
Check the parts and patterns in the path.
Replace X701, etc.
No
Fig. 1
IC771 (pin 1)
USB Power SW output
13
Yes
Yes
Is XRST
high?
No
Are
USCS and USCLK
high?
Yes
No
IC701 (pins 74,75)
USCS/USCLK (Refer to Fig. 1 and 2)
XIN/XOUT
A
B
IC701
IC953 (5 V
→
3 V)
CN702
XRST
pin 72
pin 3
pins 1,2
pin 5
USCS
pin 121
pin 11
pins 12,13
pin 9
HREQ
pin 122
pin 6
pins 4,5
pin 12
USDAI
pin 118
pin 8
pins 9,10
pin 10
Fig. 2
IC701
IC951 (3 V
→
5 V)
CN702
USCLK
pin 116
pins 4,5
pin 6
pin 7
USDAO
pin 115
pins 9,10
pin 8
pin 11
TREQ
pin 123
pins 12,13
pin 11
pin 13