Sony HCD-MD373, Service Manual, Page: 36 / 98

36
KMS 260A
27X40
B0825
N
Iop = 82.5 mA in this case
Iop (mA) = Digital voltmeter reading (mV)/1 (
Ω
)
5. Then “LD 7.0 mW $ ” will be displayed.
6. Press the
=0
/MD/CD/TUNING – button or
)+
/
MD/CD/ button so that the reading of the laser power
meter becomes 6.9 to 7.1 mW, press the ENTER/YES “R” but-
ton and save it.
Note : Do not perform the emission with 7.0 mW more than 15
seconds continuously.
7. Then, Press the
=0
/MD/CD/TUNING – button or
)+
/MD/CD/ button and display “LDPWR
CHECK”.
8. Press the ENTER/YES “R” button once and display “LD 0.9
mW $ ”. Check that the reading of the laser power meter be-
come 0.85 to 0.91 mW.
9. Press the ENTER/YES “R” button once more and display “LD
7.0 mW $ ”. Check that the reading the laser power meter and
digital volt meter satisfy the specified value.
Note down the digital voltmeter reading value.
Specified Value :
Laser power meter reading : 7.0 ± 0.1 mW
Digital voltmeter reading : Optical pick-up displayed value ± 10%
(Optical pick-up label)
10. Press the MENU/NO “R” button and display “LDPWR
CHECK” and stop the laser emission.
(The MENU/NO “R” button is effective at all times to stop the
laser emission.)
11. Press the
=0
/MD/CD/TUNING – button or
)+
/
MD/CD/ button to display “Iop.Write”.
12. Press the ENTER/YES “R” button. When the display becomes
Ref=@@@.@ (@ is an arbitrary number), press the ENTER/
YES “R” button to display “Measu=@@@.@” (@ is an arbi-
trary number).
13. The numbers which can be changed will blink. Input the Iop
value noted down at step 9.
To select the number : Press the
=0
/MD/CD/TUNING –
button or
)+
/MD/CD/ button.
To select the digit : Press the SYNC REC button.
14. When the ENTER/YES “R” button is pressed, “Complete!”
will be displayed momentarily. The value will be recorded in
the non-volatile memory and the display will become “Iop
Write”.
Note 1: After step 4, each time the ENTER/YES “R” button is
pressed, the display will be switched between “LD 0.7 mW
$
”, “LD 6.2 mW $ ”, and “LD Wp $ ”.
Nothing needs to be performed here.
(For details of the method for checking
this value, refer to “5-8. Recording and
Displaying IOP Information”.)
5-11. TRAVERSE ADJUSTMENT
Connection :
Adjusting Procedure :
1. Connect an oscilloscope to CN110 pin
3
(TE) and CN110 pin
1
(VC) of the BD board.
2. Load a disc (any available on the market). (Refer to Note 1.)
3. Press the
)+ /MD/CD/ button continuously
and move the optical pick-up outside the pit.
4. Press the
=0
/MD/CD/TUNING – button or
)+
/
MD/CD/ button and display “EF MO ADJUST”.
5. Press the ENTER/YES “R” button and display “EFB = MO-
R”.
(Laser power READ power/Focus servo ON/tracking servo OFF/
spindle (S) servo ON)
6. Press the
=0
/MD/CD/TUNING – button or
)+
/
MD/CD/ button so that the waveform of the oscillo-
scope becomes the specified value.
(When the
=0
/MD/CD/TUNING – button or
)+
/
MD/CD/ button is pressed, the of “EFB= ”
changes and the waveform changes.) In this adjustment, wave-
form varies at intervals of approx. 2%. Adjust the waveform so
that the specified value is satisfied as much as possible.
(Read power traverse adjustment)
(Traverse Waveform)
7. Press the ENTER/YES “R” button and save the result of ad-
justment to the non-volatile memory (“EFB = SAVE” will be
displayed for a moment. Then “EFB = MO-W” will be dis-
played).
8. Press the
=0
/MD/CD/TUNING – button or
)+
/
MD/CD/ button so that the waveform of the oscillo-
scope becomes the specified value.
(When the
=0 /MD/CD/TUNING – button or )+ /
MD/CD/ button is pressed, the of “EFB- ”
changes and the waveform changes.) In this adjustment, wave-
form varies at intervals of approx. 2%. Adjust the waveform so
that the specified value is satisfied as much as possible.
(Write power traverse adjustment)
(Traverse Waveform)
V : 0.5 V/div
H : 10 ms/div
Input : DC mode
Oscilloscope
BD (MD) board
CN110 pin
3
(TE)
CN110 pin
1
(VC)
VC
A
B
Specification A = B
VC
A
B
Specification A = B