Rotel RDV-985, Техническое руководство

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2. Power Supply Volume
With all the wiring removed, check unit power board.
(1) Remove all flat wires and wire assemblies which are connected to CN801, CN805, CN806.
(2) Short -circuit CN805"4" (POWER ON:B168) and "5" (B5V:B167). (Set each regulator to ON.)
(3)
(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 CN801, CN805, CN806 and check voltage.
(1) Remove the wire short -circuiting CN805"4" and "5".
(2) Remove the load resistance.
(3) Restore the connection of CN801, CN805, CN806.
(4) Connect to the outlet.
(5) Turn the POWER switch on and check the voltage at each part.
If voltage abnormally drops when CN801, CN805, CN806 are connected (load is connected) though the voltage
was at the normal level when CN801, CN805, CN806 were disconnected(load is connected), 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.
The load resistance is connected between CN805"5"(B5V:B167) and "8,9"(D.GND:B164).
* If the load resistance is not connected, the voltage is not output to "B167".
3. Open/Close Operation
Press OPEN/CLOSE key
Does the tray
smoothly open?
Voltage
of IC401"52"
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 S835 (OPEN/
CLOSE) and the
wiring to IC714.
YES
NO
Press in by hand
when fully opened.
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?
Ejected
Voltage of
IC401"52" at 0V when
tray opening operation
ends?
Replace IC401.
Check the
connection of
CN102"3" and
IC401"51".
Voltage of
IC401"51" at 0V when
tray closing
ends?
NO
NO
NO
YES
YES
YES
YES
YES
NO
NO
NO
NO
YES
YES
YES YES
NO
Does the tray
retreat?
Check the connection between
CN102 and mechanical unit.
Check the mechanical unit.
Check the
connection
of CN102"1"
and
IC401"52"
Replace IC401
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