JVC XV-1000BK, Service Manual

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2. Power Supply Volume
With all the wiring removed, check unit power board (ENS-002-4).
(1) Remove all flat wires and wire assemblies which are connected to CN902 to CN906.
(2) Short-circuit CN905‡G (POWER ON) and ‡F (B5V). (Set each regulator to ON.)
(3) Short-circuit CN903‡D (A.GND) and ‡G (D.GND).
(4) Connect to the outlet and check the voltage at each part.
(For the voltage specification, see the wiring diagram.)
Then restore the connection of CN902 to CN906 and check voltage.
(1) Remove the wire short-circuiting CN905‡G and ‡F.
(2) Remove the wire short-circuiting CN903‡D and ‡G.
(3) Restore the connection of CN902 to CN906.
(4) Connect to the outlet.
(5) Turn the POWER switch on and check the voltage at each part.
If voltage abnormally drops when CN902 to CN906 are connected (load is connected) though the voltage was at
the normal level when CN902 to CN906 were disconnected, or if the protective element (fuse, etc.) is opened,
the load which is supplied power may be defective or the wiring may be short-circuited.
3. Open/Close Operation
Press OPEN/CLOSE key
Does the tray
smoothly open?
Voltage
of IC401"35"
at 0V?
of
the remote control
box functions
normally?
Any
voltage applied
between CN102"4"
and "5"?
Check the
connection
between CN102
and mechanical
unit. Check the
mechanical unit.
Check IC251 and
the periphery.
To Microcomputer
Volume.
Check S831 (OPEN/
CLOSE) and the
wiring to IC601.
YES
NO
Press in by hand
when fully opened.
Does the tray
retreat?
Voltage
between CN102"4"
and "5" at 0V when
tray ends
retreating?
Voltage of
CN102"3" at 0V when
tray closing
ends?
OPEN/CLOSE
operation is OK.
Check the connection between
CN102 and mechanical unit.
Check the mechanical unit.
Voltage of
CN102"1" at 0V when
tray opening operation
ends?
Check the connection between
CN102 and mechanical unit.
Check the mechanical unit.
Ejected
Voltage of
IC401"34" at 0V when
tray opening operation
ends?
Replace IC401.
Check the
connection of
CN102"3" and
IC401"33".
Check the
connection
of CN102"1"
and
IC401"34".
Voltage of
IC401"33" at 0V when
tray closing
ends?
Replace IC401.
NO
NO
NO
YES
YES
YES
YES
YES
NO
NO
NO
NO YES
YES
YES YES NO