Sony HCD-MD555, Руководство по обслуживанию

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Creating 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 an MO disc (blank disc) commercially available.
2. Rotate the MULTI JOG knob and display “CREC MODE”
(31).
3. Press the ENTER/YES button to display “CREC MID”.
“CREC (0300)” is displayed for a moment and recording starts.
4. Complete recording within 5 minutes.
5. Press the MENU/NO button and stop recording .
6. Press the MD
§
button and remove the MO disc.
The above procedure shows how to create a continuous recording
data for the focus bias adjustment and error rate check.
Note :
• Be careful not to apply vibration during continuous recording.
Check Before Repairing
This is an approximate check to locate the source of trouble before
starting to replace the parts. Refer to “Parts Replacement- Check
Before Adjustment” of Service Note (page 11) for more detailed.
Temperature Compensation Offset Adjustment
Adjust both the room temperature and the internal temperature of
this set to 22 to 28
°
C before starting the adjustment.
Adjusting Method :
1. Rotate the MULTI JOG knob and let the display “TEMP
CHECK”.
2. Press the ENTER/YES button.
3. When “T = @@(##) (OK” appears, the temperature check is
normal. If “T = @@(##) (NG” is displayed, the temperature
check is not good. (@@ is the present value of this set. ## is
the value that is written in the non-volatile memory.)
Laser Power Check
Before starting the laser power check :
Check the IOP value of the optical pickup before starting the laser
power check. (Refer to section “Recording and Display of IOP
Information” (Page 47).)
Connection :
Adjusting Method :
1. Set the laser power meter on top of the objective lens of the
optical pickup. (When it cannot be set properly, press the
0
button or
)
button to move the optical pickup so that the
laser power meter can be set.)
Connect the digital voltmeter to TP170 (I + 3 V) and TP169
(IOP).
2. Rotate the MULTI JOG knob and let the display “LDPWR
CHECK” (C: 2) appear.
3. Press the ENTER/YES button once and let the display “LD
0.9 mW $ ” appear.
Check that the laser power meter reading is in the range of 0.84
to 0.92 mW.
4. Repress the ENTER/YES button again and let the display
“LD 7.0mW $ ” appear.
Check that the laser power meter and digital voltmeter readings
satisfy the specified value.
Specification :
Laser power meter reading : 7.0 ± 0.2 mW
Digital voltmeter reading : The value that is indicated on the label
of the optical pickup ±10 %
5. Press the MENU/NO button and let display “LDPWR
CHECK” appear that stops laser emission.
(The MENU/NO button can be accepted at all times to stop
the laser emission.)
Note 1:
Every time when the ENTER/YES button is pressed
after step 4, the display changes in the order starting from
“LD 0.7m W$
”, “LD 6.2m W$ ”, “LD
WP
ホセイ
$ ”. This is just a display and any
operations are not necessary.
Optical pickup
objective lens
Laser power meter
TP170 (I+3V)
TP169 (IOP)
BD board
Digital voltmeter
KMS
260A
27X40
B0825
(Label of optical pickup)
For the procedure to check this value,
refer to section “Recording and
Display of IOP Information”.
Iop = 82.5 mA in this example
Iop (mA) = Digital voltmeter reading (mV) / 1(
Ω
)
6) Use the jig disc that is free from finger print because it can
adversely affect the adjustment result.
Note:
Using the new MD laser power meter 8010S (J-2501-145-A) instead
of conventional laser power meter is convenient for check laser
power and adjustment during the electrical adjustment. The
procedure to set the laser power meter sensor to the objective lens
of pickup is significantly improved.