JVC XV-1000BK, Service Manual

Page: 60 / 80

[ Servo Volume 1 ]
Troubleshooting when error code is displayed in TEST mode
Single-layer DVD Automatic adjustment
(Basically the same with double-layer DVD)
Remove the top cover.
NO
While pressing both the "ON
SCREEN" key and "DVD
MENU" key, connect the AC
cord to the outlet.
"TEST"
displayed
on FL?
YES
OK
Press the "POWER" key.
Some
component
other than
servo may be
defective.
NO
Tray opened?
YES
IC251 (4CH driver)
R261
IC401
(main microcomputer)
Insert single-layer
DVD and press the
"OPEN/CLOSE" key.
(Automatic adjustment
is executed)
NO
"CHECK OK"
displayed
on FL?
YES
Check points for each error
(1) Spindle start error
* Defective spindle motor
•EWith the power turned off, measure the resistance between CN101"33", "34" and "35" pins.
(Must be approx. 11ohms.)
•EHall element: Is a sine wave output between CN101"25" and "27", between "28" and "29",
•@and between "30" and "31" during rotation?
In either case, replace the mechanical unit.
* Defective spindle driver (IC252)
•EIs a driving wave output from CN101"33", "34" and "35"?
During
rotation
Is IC252"1" at "H" level (START)?
* Servo IC Is control signal sent to the motor driver?
TP256: Duty is 50% during stop, but varies during rotation (greatly varies at start).
If not sent, pattern or servo IC (IC301) is defective.
W004: Approx. 2.5V during stop, but varies during rotation (greatly varies at start).
If not sent, pattern or servo IC (IC301) is defective.
* Is FG input to servo IC?
Observe FG wave from IC301"45". If not output, pattern, IC252 or IC301 is defective.
Check for errors
corresponding to the
error code displayed
on FL by the self-
diagnosis function
as follows.
Press
"OPEN/CLOSE" key.