Sony HCD-MD555, Service Manual

Page: 46 / 124

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Focus Bias Check
Change the focus bias and check the focus tolerance amount.
Checking Method :
1.
Load a test disc (MDW-74/AU-1).
2. Rotate the MULTI JOG knob and display “CPLAY MODE”
(S:30).
3. Press the ENTER/YES button twice and display “CPLAY
MID”.
4. Press the MENU/NO button when “C = AD = ” is
displayed.
5. Rotate the MULTI JOG knob and display “FBIAS
CHECK”(05).
6. Press the ENTER/YES button and display “ / c
= ”.
The first four digits indicate the C1 error rate, the two digits
after [/] indicate ADER, and the 2 digits after [c =] indicate the
focus bias value.
Check that the C1 error is below 220 and ADER is 2.
7. Press the ENTER/YES button and display “ / b
= ”.
Check that the C1 error is not below 220 and ADER is 2.
8. Press the ENTER/YES button and display “ / a
= ”.
Check that the C1 error is not below 220 and ADER is 2.
9. Press the MENU/NO button, next press the MD
§
button,
and remove the disc.
C PLAY Check
MO Error Rate Check
Checking Method :
1.
Load a test disc (MDW-74/AU-1).
2. Rotate the MULTI JOG knob and display “CPLAY
MODE”(S:30).
3. Press the ENTER/YES button twice and display “CPLAY
MID”.
4. “C = AD = ” is displayed.
5. Check that C1 error rate is below 80 and ADER is 2.
6. Press the MENU/NO button, stop playback, press the MD §
button, and remove the test disc.
CD Error Rate Check
Checking Method :
1.
Load a test disc (MD) TDYS-1.
2. Rotate the MULTI JOG knob and display “CPLAY MODE”
(S:30).
3. Press the ENTER/YES button twice and display “CPLAY
MID”.
4. “C = AD = ” is displayed.
5. Check that the C1 error rate is below 50.
6. Press the MENU/NO button, stop playback, press the MD
§
button, and remove the check disc (MD).
Self-Record/Playback Check
The set that is being repaired, creates a continuous record/playback
disc by itself and checks the error rate.
Checking Method :
1. Insert a disc (blank disc) to which data is allowed to be recorded.
2. Rotate the MULTI JOG knob and let the display “CREC
MID” (S: 31) appear.
3. Press the ENTER/YES button and let the display “CREC
MID” appear.
4. As recording is started, the message
REC
appears and then
the message changes to “CREC” (@@@@” (@@@@ means
address) indicating that recording is started.
5. About one minute later, press the MENU/NO button to stop
the continuos recording.
6. Rotate the MULTI JOG knob and let the display “CPLAY
MID” (S: 30) appear.
7. Press the ENTER/YES button and let the display “CPLAY
MID” appear.
8. “C = AD = ” appear.
9. Check that C1 error is 80 or less and AD error is 2 or less.
10. Press the MENU/NO button to stop playing back. Press the
MD
§
button and remove the disc.
Initial Setting of Adjustment Value
Note :
This is the mode which sets and returns the adjustment result value
that is recorded in the non-volatile memory, to the initial setting
value. However, the resultant value of the temperature compensation
offset adjustment is not set or not returned to the initial setting value.
If the initial setting is executed, all adjustment steps must be
performed again from the beginning excluding temperature
compensation offset adjustment.
For this initial setting, refer to “Precaution for Adjustment” (Page
43). Perform the initial setting before starting adjustments as
necessitated.
Setting Method :
1. Rotate the MULTI JOG knob and let the display “ADJ
CLEAR” (24) ) appear.
2. When the ENTER/YES button is pressed, “Complete!”
appears for a moment and the initial setting is executed. Then
“ADJ CLEAR” appears.