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HCD-C7NT
CHECKS PRIOR TO PARTS REPLACEMENT AND ADJUSTMENTS IN MD
Before performing repairs, perform the following checks to determine the faulty locations up to a certain extent.
Details of the procedures are described in "5 Electrical Adjustments".
Criteria for Determination
(Unsatisfactory if specified value is not satisfied)
Laser power check
• 0.9 mW power
(6-2 : See page 37)
• 8.4 mW power
• Labeled on the optical pick-up
Auto check
• Unsatisfactory if displayed as "NG: XXXX"
(6-4 : See page 38)
Temperature
• Unsatisfactory if displayed as "T=@@ (##) [NG]"
compensation
offset check
(6-1 : See page 37)
Note:
The criteria for determination above is intended merely to determine if satisfactory or not, and does not serve as the specified value for adjust-
ments.
When performing adjustments, use the specified values for adjustments.
Figure1:
KMS-262A
SPECIFIED VALUE
KMS-262E
Figure2:
KMS-262A
SPECIFIED VALUE
KMS-262E
RETRY CAUSE DISPLAY MODE IN MD
• In this test mode, the causes for retry of the unit during recording can be displayed on the fluorescent indicator tube. During
playback, the "track mode" for obtaining track information will be set.
This is useful for locating the faulty part of the unit.
• The following will be displayed.
During recording and stop : Retry cause, number of retries, and number of retry errors.
During playback
: Information such as type of disc played, part played, copyright.
These are displayed in hexadecimal.
Precedure:
1. Load a recordable disc whose contents can be erased into the unit.
2. Press the MENU/NO "R" button. When "Edit Menu" is displayed on the fluorescent indicator tube, press the
. "R" or > "R" button to display "All Erase?".
3. Press the ENTER/YES "R" button.
4. When "All Erase??" is displayed on the fluorescent indicator tube.
5. Press the ENTER/YES "R" button to display "Complete!".
6. Press the REC/REC IT button to start recording. Then press the u button and start recording. If recording cannot be performed,
press the FUNCTION z button and set a different function.
7. Press three buttons of VOL - , u and CD SYNC HIGH simultaneously to enter the retry cause display mode.
8. To check the "track mode", press the u button to start playback.
9. To release this mode, press the ?/1 button to turn the power off. When "TOC" goes off, disconnect the power plug from the
outlet.
If the test mode cannot be released, refer to "Factory Preset" on page 24.
30
Specified value : figure1
Specified value : figure2
Iop (at 8.4mW)
Iop value ± 10mA
(X is an arbitrary number)
(@@, ## are both arbitrary numbers)
0.84 to 0.92 mW
0.90 to 0.96 mW
8.1 to 8.7 mW
8.4 to 8.9 mW
Measure if unsatisfactory
• Clean the optical pick-up
• Adjust again
• Replace the optical pick-up
• Replace the optical pick-up
• Replace the optical pick-up
• Check for disconnection of the circuits around D101
(BD (MD) board)
• Check the signals around IC101, IC151, CN102, CN103
(BD (MD) board)
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