Pioneer VSX-819H-K Service Manual page 31

5
iPod Troubleshooting
Step 0: Preliminary confirmation
Confirm the following items before checking.
Do screws of
COAX jack securely
tighten ?
Yes
To STEP 1
Step 1: Power supply
CN807 (pins 1, 3)
5 V input
Is
No
the voltage
5 V ?
Yes
REG2 (pin 3)
(to chassis)
Is
No
the voltage of
5 V input?
Yes
REG2 (pin 2) 3.3 V output (to chassis)
Is
No
the voltage
3.3 V output?
Yes
The output and GND may be
short-circuited. Check the path
between them.
5 V input
REG1 (pin 3)
Is
No
the voltage
5 V ?
Yes
5
6
No
Tighten screws securely.
Is there any
No
loose connection
CP105 of MAIN
Assy?
Check the MAIN
Yes
Assy.
To STEP 1
Check the patterns in
the path.
Is REG2
No
abnormally
hot?
Replace REG2.
Yes
Check the patterns in
the path.
VSX-819H-K
6
7
REG1 (pin 2) 1.8 V output
Is
Is REG1
No
the voltage
abnormally
1.8 V output?
Yes
The output and GND may be
short-circuited. Check the path
between them.
IC805 (pin 5)
5 V input
Is
Is pin 4
No
the voltage
(EN) of IC805
5 V input?
Low?
Yes
Replace IC805.
IC805 (pin 1)
USB Bus power
Is
No Check the parts and patterns
the voltage
in the path of CN801.
5 V output?
Yes
To STEP 2
7
8
A
No
hot?
B
Replace REG1.
Yes
No
C
Yes
No
Is pin 3
(OC) of IC805
high?
Yes
Check the parts and
D
patterns in the path
(CN801).
E
F
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