Aiwa XR-MDK109 Service Manual page 38

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7) Checking the focus search and spindle kick
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• The focus search and the spindle kick can be checked by pressing the
inserting a disc. During checking, the message "FOCUS SEARCH" is displayed.
After checking these operations, press the 9 button to return the display to "ALL SV OFF".
•
8) Checking the focus servo
• Insert a test disc.
• Move the pickup to the center track using the
• Press the "MD MODE" button until the following servo mode is selected in accordance with the inserted disc.
MO disc (MO) .................... Display "SELECT GRV". ("TIME MARK" lights.)
PIT disc (CD) ...................... Display "SELECT PIT". ("AUTO MARK" lights.)
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• Press the button. If the focus servo is operating normally, the message "FOCUS ON!" is displayed after "FOCUS
SEARCH".
After the checking is completed, press the 9 button to return the display to "ALL SV OFF".
•
9) Checking that all servo loops are turned on
• The tracking servo and the sled servo are turned on and all servo loops work when the "ENTER" button is pressed in the
"FOCUS ON!" state.
• If all servo loops are normal, "ALL SV OFF" is displayed.
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After the checking is completed, press the 9 button to return the display to "ALL SV OFF".
•
3. Adjustment Mode
3-1. Temperature Compensation Adjustment
Test point: Check the test point on the display.
Tool: Thermometer
Adjustment procedure:
1) After the MD test mode has started up, press the 9 button to display "ALL SV OFF".
2) Press the "DISPLAY" button to display "TMP = $⁄⁄".
3) Press the ; button to display "TMP + **C: + 00".
4) Put the thermometer near the MD mechanism to measure the room temperature.
5) Adjust the indication value ** using the
the adjustment is complete, press the "ENTER" button.
6) Then, press the 9 button to return the display to "ALL SV OFF".
7) After the above setting, reduce or add the value indicated by the sharp sign (##) of "TMP + **C: + ##" from or to the value
indicated by the asterisk (**) of "TMP + **C: + ##". The calculated value must be the room temperature.
Note: Normally, do not perform the temperature compensation adjustment.
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