Sony HCD-CL5MD Service Manual page 37

6-5. 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. Move ./> and display "CREC 1MODE"(C35).
3. Press the ENTER/YES button again to display "CREC 1MID".
Display "CREC (0300)" and start to recording.
4. Complete recording within 5 minutes.
5. Press the MENU/NO button and stop recording.
6. Press the Z button and remove the disc.
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.
6-6. CHECKS PRIOR TO REPAIRS
These checks are performed before replacing parts according to
"approximate specifications" to determine the faulty locations.
6-6-1. Temperature Compensation Offset Check
When performing adjustments, set the internal temperature and room
temperature to 22 to 28ºC.
Checks cannot be performed properly if performed after some time
from power ON due to the rise in the temperature of the IC and
diode, etc. So, perform the checks again after waiting some time.
Checking Procedure:
1. Move ./> to display "TEMP CHECK"(C12).
2. Press the ENTER/YES button.
3. "T=@@(##) [OK]" should be displayed. If "T=@@ (##) [NG]"
is displayed, it means that the results are bad.
(@@ indicates the current value set, and ## indicates the value
written in the non-volatile memory.)
6-6-2. Laser Power Check
Before checking, check the Iop value of the optical pick-up.
(Refer to 6-8. Recording and Displaying Iop Information.)
Connection :
Optical pick-up
objective lens
BD (MD) board
CN105 pin 1 (I+3V)
CN105 pin 2 (IOP)
Checking Procedure:
1. Set the laser power meter on the objective lens of the optical
2. Then, move ./> and display "LDPWR CHECK" (C13).
3. Press the ENTER/YES button once and display "LD 0.9 mW $
4. Press the ENTER/YES button once more and display " LD 7.0
Specified Value :
Laser power meter reading : 7.0 ± 0.2 mW
Digital voltmeter reading : Optical pick-up displayed value ± 10%
5. Press the MENU/NO button and display "LDPWR CHECK"
Note 1: After step 4, each time the ENTER/YES button is pressed,
6-6-3. Iop Compare
The current Iop value at laser power 7 mW 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
Laser power
meter
Procedure
1. Move ./> to display "Iop Compare"(C27).
2. Press the ENTER/YES button and start measurements.
3. When measurements complete, the display changes to
Digital volt meter
4. Press the MENU/NO button to end.
pick-up. (If cannot set properly, press the m or M button
and move the optical pick-up.)
Connect the digital volt meter to CN105 pin 1 (I+3V) and
CN105 pin 2 (IOP).
". Check that the reading of the laser power meter become
0.84 to 0.92 mW.
mW $ ". Check that the reading the laser power meter and
digital volt meter satisfy the specified value.
(Optical pick-up label)
(For details of the method for checking
KMS 260B
this value, refer to "6-8. Recording and
20101
Displaying Iop Information".)
H0576
R
Iop = 57.6 mA in this case
Iop (mA) = Digital voltmeter reading (mV)/1 ( Ω )
(C13) and stop the laser emission.
(The MENU/NO button, it is effective at all times to stop the
laser emission.)
the display will be switched between "LD 0.7 mW $
"LD 6.2 mW $ ", and "LD Wp $
be performed here.
temperature.
"±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.
HCD-CL5MD
",
". Nothing needs to
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