Sony HCD-M333 Service Manual page 39

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5. Using the Continuously Recorded Disc
* This disc is used in focus bias adjustment and error rate check.
The following describes how to create a continuous recording
disc.
1. Insert a disc (blank disc) commercially available.
2. Press the . "R" or
2MODE" (C37).
3. Press the ENTER/YES "R" button again to display "CREC 2
MID".
Display "CREC 2(0300)" and start to recording.
4. Complete recording within 5 minutes.
5. Press the MENU/NO "R" button and stop recording .
Press the Z (MD) button and remove the disc.
6.
The above has been how to create a continuous recorded data for
the focus bias adjustment and error rate check.
Note: Be careful not to apply vibration during continuous recording.
6. Checks Prior to Repairs
These checks are performed before replacing parts according to
"approximate specifications" to determine the faulty locations. For
details, refer to "Checks Prior to Parts Replacement and Adjustments
in MD" (see page 13).
6-1. Temperature Compensation Offset Check
When performing adjustments, set the internal temperature and room
temperature to 22º C to 28º C .
Procedure:
1. Press the
.
CHECK" (C12).
2. Press the ENTER/YES "R" button.
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3. "T=@@(##) [OK]" should be displayed. If "T=@@ (##) [NG]"
L 13942296513
is displayed, it means that the results are bad.
(@@ indicates the current value set, and ## indicates the value
written in the non-volatile memory.)
6-2. Laser Power Check
Before checking, check the Iop value of the optical pick-up.
Refer to 8. Recording and Displaying the Iop Information (see page
42).
Connection:
Optical pick-up
objective lens
BD (MD) board
CN105 pin 1 (I+3V)
CN105 pin 2 (Iop)
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"R" or "R" button to display "TEMP
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laser
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digital voltmeter
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Procedure:
1. Set the laser power meter on the objective lens of the optical
pick-up. (When it cannot be set properly, press the m but-
ton or M button to move the optical pick-up.)
Connect the digital volt meter to CN105 pin 1 (I+3V) and
CN105 pin 2 (Iop).
2. Then, press the
"LDPWR CHECK" (C13).
3. Press the ENTER/YES "R" button once and display "L
0.93mW$
becomes specified value.
Specified Value:
KMS-262A
KMS-262E
4. Press the ENTER/YES "R" button once more and display " L
8.65mW$
and digital volt meter satisfy the specified value.
Note : Never allow the laser emission at 8.65mW for 15 seconds or longer.
Specified Value:
Laser power meter reading :
KMS-262A
KMS-262E
Digital voltmeter reading : Optical pick-up displayed value ± 10%
(Optical pick-up label)
KMS262E
20101
B0576
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lop=57.6 mA in this case
lop (mA) = Digital voltmeter reading (mV)/1 ( Ω )
5. Press the MENU/NO "R" button and display "LDPWR
CHECK" (C13) and stop the laser emission.
(The MENU/NO "R" button is effective at all times to stop
the laser emission.)
Note: After step 4, each time the ENTER/YES "R" button is pressed,
the display will be switched to "L 0.73mW$
7.70mW$
performed here.
Checking Location: BD (MD) board (see page 46)
6-3. Iop Compare
The current Iop value at laser power 8.65mW (KMS-262E) or
8.4mW (KMS-262A) output and reference Iop value (set at
shipment) written in the nonvolatile memory are compared, and the
rate of increase/decrease will be displayed in percentage.
Note: Perform this function with the optical pick-up set at room tempera-
ture.
Procedure:
1. Press the
(C27).
2. Press the ENTER/YES "R" button and start measurements.
3. When measurements complete, the display changes to "± xx%
yy".
xx is the percentage of increase/decrease, and OK or NG is
displayed at yy to indicate whether the percentage of increase/
decrease is within the allowable range.
u163 4. Press the MENU/NO "R" button to end.
.
2 9 9 4 2 8
"R" or "R" button and display
. >
". Check that the reading of the laser power meter
0.84 to 0.92mW
0.90 to 0.96mW
". Check that the reading the laser power meter
8.10 to 8.70mW
8.40 to 8.90mW
For details of the method for
checking this value, refer to
"8. Recording and Displaying
the Iop Information"
1 5 0 5 8 2 9 9 4
" "L WP $ ". Nothing needs to be
. "R" or > "R" button to display "Iop Compare"
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HCD-M333
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