Sony ZS-M30 Service Manual page 21

6. CHECK PRIOR TO REPAIRS
These checks are performed before replacing parts according to
"approximate specifications" to determine the faulty locations. For
details, refer to "Checks Prior to Parts Replacement and Adjust-
ments"(See page 4).
6-1. Laser Power Check
Connection:
Optical pick-up
objective lens
MD BOARD (SIDE B)
C520 C522
36
R518
37
40
C519
R622
45
48
Q502
C508
C506
C611
R633
Checking Procedure:
1. Set the laser power meter on the objective lens of the optical
pick-up. (When it cannot be set properly, press the m but-ton
or M button to move the optical pick-up)
Connect the digital voltmeter to TPO 502 (I+3 V) and TP503 (IOP)
on the MD board.
2. Turm the JOG dial to display "LDPWR CHECK".
3. Press the YES/ENTER button once to display "LD 0.9 mW $
". Check that the reading of the laser power meter become
0.80 to 0.96 mW.
4. Press the YES/ENTER button once more to display "LD 7.0
mW $ ". Check that the reading the laser power meter and
digital voltmeter satisfy the specified value.
Specified Value:
Laser power meter reading : 6.8 - 7.2 mW
Digital voltmeter reading : Value on the optical pick-up label
± 10 %
laser
power meter
digital voltmeter
TP502 (I+3V)
TP503 (IOP)
(TE)
35 30 25 R519
24
C521
20
15
R515
13
5 1012
1
R512
R513
C512
R503
R514
C511
TP502
R511
(I+3V)
TP503
(IOP)
L506
(Optical pick-up label)
KMS260B
27X40
B0825
lOP=82.5 mA in this case
lOP (mA) = Digital voltmeter reading (mV)/3.3 ( Ω )
5. Press the NO/CANCEL button to display "LDPWR CHECK"
and stop the laser emission.
(The NO/CANCEL button is effective at all times to stop the
laser emission)
: After step 4, each time the YES/ENTER button is pressed,
Note 1
the display will be switched "LD 0.7 mW $ ",
"LD 6.2 mW $ ",
and "LD WP $ ". Nothing needs to be performed
here.( = correction)
6-2. Focus Bias Check
Change the focus bias and check the focus tolerance amount.
Checking Procedure:
1. Load the test disc (MDW-74/AU-1).
2. Turn the JOG dial to display "CPLAY MODE".
3. Press the YES/ENTER button twice to display "CPLAY MID".
4. Press the NO/CANCEL button when "C1 =
is displayed.
5. Turn the JOG dial to display "FBIAS CHECK".
6. Press the YES/ENTER button to display "
The first four digits indicate the C1 error rate, the two digits
after (( / )) indicate ADER, and the 2 digits after "c =" indicate
the focus bias value.
Check that the C1 error is below 50 and ADER is below 2.
7. Press the YES/ENTER button to display "
Check that the C1 error is about 200 and ADER is below 2.
8. Press the YES/ENTER button to display "
Check that the C1 error is about 200 and ADER is below 2.
9. Press the NO/CANCEL button, then press the Z (MD)
button and take out the test disc.
6-3. C PLAY Check
MO Error Rate Check
Checking Procedure:
1. Load the test disc (MDW-74/AU-1).
2. Turn the JOG dial to display "CPLAY MODE".
3. Press the YES/ENTER button to display "CPLAY MID".
4. The display changes to "C1 =
5. If the C1 error rate is below 80, check that ADER is below 2.
6. Press the NO/CANCEL button to stop playback, then press
the Z (MD) button and take out the test disc.
CD Error Rate Check
Checking Procedure:
1. Load the check disc (MD) TDYS-1.
2. Turn the JOG dial to display "CPLAY MODE".
3. Press the YES/ENTER button twice to display "CPLAY MID".
4. The display changes to "C1 =
5. Check that the C1 error rate is below 50.
6. Press the NO/CANCEL button to stop playback, then press
the Z (MD) button and take out the check disc.
ZS-M30
AD = "
/ c = ".
/ b = ".
/ a = ".
AD = ".
AD = ".
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