Pioneer PRO-950HD Service Manual page 32

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QQ
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A
< Fundamental operation failure >
"Home Media Gallery" does not work
at all!
Doesn't "Home Media Gallery" on
"HOME MENU" become selectable
after power-on?
B
There may be something defective in
the product.
Check each wire connection with the
MAIN ass'y.
[HN1]CN7851<=>[M35]CN4002
[HN2]CN7901<=>[M31]CN4111
Isn't there any failure?
Check the power supply for HNM ass'y.
C
Is there +5V voltage on 1st and 2nd pin
in CN7901 of HNM side and on 1st and
2nd pin in CN4111 of MAIN side?
To make analysis, remove the wire
TE
L 13942296513
ass'y between CN7901 and CN4111.
Then, check the voltage in MAIN side
again.
Is +5V still not there?
There may be something defective in
MAIN ass'y.
D
Check the switching regulator circuit in
MAIN ass'y for HNM power supply.
That is IC4309, Q4304 and the parts
around it.
E
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Note:
It takes a short while to start "Home
Media Gallery" function.
Please wait for about 40 seconds until
No
"Home Media Gallery" turns selectable.
No
Check the UART communication
between HNM ass'y and MAIN ass'y.
Almost 35 seconds after power-on, is
yes
any pulse signal observed on 2nd pin
in CN7851: RXD_HNM?
No
yes
No
There may be something defective in
HNM ass'y.
Replace the HNM ass'y with another
one.
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PRO-950HD
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8
Note:
After completing the self-initializing,
HNM ass'y notice it to MAIN ass'y by
using RXD_HNM.
No yes
Q Q
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There may be something defective in
MAIN ass'y.
Check the UART path in MAIN ass'y.
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