Sony HCD-MD555, Service Manual

Page: 47 / 124

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Recording and Display of IOP Information
The IOP data can be recorded in the non-volatile memory. The two
types of IOP data can be recorded in the non-volatile memory. One
is the unique IOP value of the optical pickup that is indicated on the
label of the optical pickup. The other is the IOP value after
completion of adjustment. When you want to check the unique
IOP value of the optical pickup, you need not to turn around the set
to look at the label since the IOP information is recorded in the non-
volatile memory.
Recording Method :
1. Rotate MULTI JOG and let the display “[Service]” appear.
Press the ENTER/YES button.
2. Rotate the MULTI JOG knob and let the display “Iop Write”
(28) appear. Press the ENTER/YES button.
3. The display changes to “Ref=@@@@” (@ is an arbitrary
number). The numbers that can be modified, flash.
4. Enter the IOP value that is indicated on the label of the optical
pickup.
To select number: Rotate MULTI JOG .
To select the digit : Press the MD WALKMAN SYNC .
5. Press the ENTER/YES button and the display changes to
“Measu=@@@.@” (@ is an arbitrary number).
6. The resultant value of adjustment is saved in the non-volatile
memory by simply pressing the ENTER/YES button in this
step 6. Therefore, press the ENTER/YES button without
changing the value on display.
7. The message “Complete!” appears for a moment. The values
are saved in the non-volatile memory. The display changes to
“lop Write”.
How to Display the IOP Values:
1. Rotate MULTI JOG and let the display “lop Read” (27) appear.
2. “@@.@/##.#” appears and the saved contents are displayed as
follows:
@@.@ : Iop value that is indicated on the label of the optical
pickup
##.# : Iop value that is the resultant value of adjustment
3. Press the MENU/NO button to end the display and to show
the message “Iop Read”.
Temperature Compensation Offset Adjustment
Save the temperature data at that time in the non-volatile memory
as 25 ˚C reference data.
Note :
1. Usually, do not perform this adjustment.
2. Perform this adjustment in an ambient temperature of 22 ˚C to
28 ˚C. Perform it immediately after the power is turned on when
the internal temperature of the unit is the same as the ambient
temperature.
3. When D101 has been replaced, perform this adjustment after
the temperature of this part has become the ambient temperature.
Adjusting Method :
1.
Rotate the MULTI JOG knob and display “TEMP ADJUST”.
2. Press the ENTER/YES button and select the “TEMP
ADJUST” mode.
3. “TEMP = ” and the current temperature data will be
displayed.
4. To save the data, press the ENTER/YES button.
When not saving the data, press the MENU/NO button.
5. When the ENTER/YES button is pressed, “TEMP =
SAV” will be displayed for some time, followed by “TEMP
ADJUST”.
When the MENU/NO button is pressed, “TEMP ADJUST”
will be displayed.
Specifications :
The “TEMP = ” should be within “E0 - EF”, “F0 - FF”, “00 -
0F”, “10 - 1F” and “20 - 2F”.
Laser Power Adjustment
Before starting the adjustment:
Check the IOP value of the optical pickup beforehand. (Refer to
section “ Recording and Display of IOP Information”.)
Connection :
Adjusting Method :
1. Set the laser power meter on the objective lens of the optical
pick-up. (When it cannot be set properly, press the
0
button
or
)
button and move the optical pick-up.)
Connect the digital volt meter to TP (IOP) and TP (I+5V).
2. Rotate the MULTI JOG knob and display “LDPWR
ADJUST”.
(Laser power : For adjustment)
3. Press the ENTER/YES button once and let the display “LD
0.9 mW $ ” appear.
4. Rotate MULTI JOG until the laser power meter reading is in
the range of 0.85 to 0.91 mW. Select the 10 mW range of the
laser power meter and press the ENTER/YES button to save
the resultant value of adjustment in the non-volatile memory.
(The message “LD SAVE $
” appears for a moment.)
Optical pickup
objective lens
Laser power meter
TP170 (I+3V)
TP169 (IOP)
BD board
Digital voltmeter