Harman Kardon HD7725 - Page 12

HD7725
When a problem occurres, first check the pick-up lens for dirt and each connector for tight and secure connection.
If the problem persists after checking both of these items, use the following check procedures.
NO NO
Does the tray open and close? -—» Is input from the OPEN/CLOSE | OPEN /CLOSE button defective
button narmal? IC401, pin 37
t YES
Is there an output at the motor LNO 10401 defective
drive terminal of IC401?
1C401, pins 9 and 10
Y YES
Is there an output from pin 9 of LNO !C203 defective
the motor drive 1IC203?
YES NO
Loading motor and its lead wire
defective, or loading mechanism
defective
(3) When initial read cannot be executed.
The following checks can be done without a disc loaded.
NO ®
NO
Does the disc motor run?
Is a laser beam emitted?
Isa tracking signal 1C101 defective
output at TP101? Poor connection between DC mechanism and connector
Is the eye pattern output
at TP202?
10101 defective
NO
Does a drop-out occure in the -—>| Defect due to scatch or other damage in the initial read
EFM signa! of TP2027
y YES
Defective disc
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