Sony HCD-C7NT Service Manual page 41

6. Press the . "R" or > "R" button so that the reading
of the laser power meter becomes the specified value, press the
ENTER/YES "R" button to save it.
KMS-262A
SPECIFIED VALUE
KMS-262E
Note: Do not perform the emission with 8.4 mW more than 15 seconds
continuously.
7. Then, press the . "R" or > "R" button to display
"LDPWR CHECK" (C13).
8. Press the ENTER/YES "R" button once to display "L0.90mW$
". Check that the reading of the laser power meter matches
with the specified value as described in the following table.
KMS-262A
SPECIFIED VALUE
KMS-262E
9. Press the ENTER/YES "R" button once more to display
"L8.40mW$ ". Check that the reading the laser power meter
and digital voltmeter satisfy the specified value.
Note down the digital voltmeter reading value.
Specified Value:
Laser power meter reading :
KMS-262A
SPECIFIED VALUE
KMS-262E
Digital voltmeter reading : Value on the optical pick-up label ±10%
(Optical pick-up label)
KMS262A
20101
B0825
Iop = 82.5 mA in this case
Iop (mA) = Digital voltmeter reading (mV)/1 ( Ω )
10. Press the MENU/NO "R" button to display "LDPWR CHECK"
(C13) and stop the laser emission.
(The MENU/NO "R" button is effective at all times to stop the
laser emission)
11. Press the . "R" or > "R" button to display "Iop Write"
(C05).
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 arbitrary 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 . "R" or > "R" button.
To select the digit :Press two buttons of VOL - and
CD Z simultaneously.
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" (C05).
Note: After step 9, each time the ENTER/YES "R" button is pressed, the
display will be switched to "L0.70mW$
"LWP $ " Nothing needs to be performed here.
8.2 to 8.6 mW
8.5 to 8.8 mW
0.84 to 0.92 mW
0.90 to 0.96 mW
8.1 to 8.7 mW
8.4 to 8.9 mW
For details of the method for
checking this value, refer to
"8. Recording and Displaying
the Iop Information"
", "L7.50mW$ " and
The method of identifying the optical pick-up
(KMS-262A/262E)
Pink : KMS-262A
UV adhesive agent =
White : KMS-262E
UV adhesive agent
11.Iop NV SAVE
Write the reference values in the nonvolatile memory to perform
"Iop compare". As this involves rewriting the reference values, do
not perform this procedure except when adjusting the laser power
during replacement of the optical pick-up and when replacing the
IC102. Otherwise the optical pick-up check may deteriorate.
Note: Perform this function with the optical pick-up set at room temperature.
Procedure:
1. Press the . "R" or > "R" button to display "Iop NV Save"
(C06).
2. Press the ENTER/YES "R" button and display "Iop [stop]".
3. After the display changes to "Iop =xxsave?", press the
ENTER/YES "R" button.
4. After "Complete!" is displayed momentarily, the display changes
to "Iop [8.4 mW]".
5. After the display changes to "Iop=yysave?", press the
ENTER/YES "R" button.
6. When "Complete!" is displayed, it means that Iop NV saving
has been completed.
12. TRAVERSE ADJUSTMENT
Note 1: Data will be erased during MO reading if a recorded disc is
used in this adjustment.
Note 2: If the traverse waveform is not clear, connect the oscilloscope
as shown in the following figure so that it can be seen more
clearly.
BD (MD) board
330 k Ω
CN105 pin 4 (TE)
CN105 pin 6 (VC)
Connection:
BD (MD) board
CN105 pin 4 (TE)
CN105 pin 6 (VC)
HCD-C7NT
Optical pick-up
(KMS-262A/262E)
oscilloscope
(DC range)
+
–
10 pF
oscilloscope
(DC range)
+
V: 0.1 V/div
–
H: 10 ms/div
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