Sony CMT-PX333 / HCD-PX333 Service Manual ▷ View online
46
HCD-PX333
14. ERROR RATE CHECK
14-1. CD Error Rate Check
Procedure:
1. Load the check disc (TDYS-1).
2. Press the
1. Load the check disc (TDYS-1).
2. Press the
.
“R”
or
>
“R”
button and display “CPLAY2
MODE” (C36).
3. Press the
ENTER/YES “R”
button twice and display “CPLAY2
MID”.
4. The display changes to “C =
AD =
)”.
5. Check that the C1 error rate is below 20.
6. Press the
6. Press the
MENU/NO “R”
button to stop playback, then press the
Z (MD) button and take out the check disc.
14-2. MO Error Rate Check
Procedure:
1. Load the continuously-recorded disc. (Refer to “5. USING
1. Load the continuously-recorded disc. (Refer to “5. USING
THE CONTINUOUSLY RECORDED DISC” (See page 40))
2. Press the
.
“R”
or
>
“R”
button to display “CPLAY2
MODE” (C36).
3. Press the
ENTER/YES “R”
button to display “CPLAY2MID”.
4. The display changes to “C1 =
AD =
)”.
5. If the C1 error rate is below 20, check that ADER is 00.
6. Press the
6. Press the
MENU/NO “R”
button to stop playback, then press the
Z (MD) button and take out the disc.
15. FOCUS BIAS CHECK
Change the focus bias and check the focus tolerance amount.
Procedure:
1. Load the continuously-recorded disc. (Refer to “5. USING
1. Load the continuously-recorded disc. (Refer to “5. USING
THE CONTINUOUSLY RECORDED DISC” (See page 40))
2. Press the
.
“R”
or
>
“R”
button to display “CPLAY2
MODE” (C36).
3. Press the
ENTER/YES “R”
button twice to display “CPLAY2
MID”.
4. Press the
MENU/NO “R”
button when “C1 =
AD =
)”
is displayed.
5. Press the
.
“R”
or
>
“R”
button to display “FBIAS
CHECK” (C16).
6. Press the
ENTER/YES “R”
button to display “
/
c =
”.
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 20 and ADER is below 2.
after “/ ” indicate ADER, and the 2 digits after “c =” indicate
the focus bias value.
Check that the C1 error is below 20 and ADER is below 2.
7. Press the
ENTER/YES “R”
button and display “
/
b =
”.
Check that the C1 error is below 100 and ADER is below 2.
8. Press the
ENTER/YES “R”
button and display “
/
a =
”.
Check that the C1 error is below 100 and ADER is below 2
9. Press the
MENU/NO “R”
button, then press the Z (MD) button
and take out the disc.
Note:
If the C1 error and ADER are above other than the specified
value at points a (step 8. in the above) or b (step 7. in the above),
the focus bias adjustment may not have been carried out prop-
erly. Adjust perform the beginning again.
value at points a (step 8. in the above) or b (step 7. in the above),
the focus bias adjustment may not have been carried out prop-
erly. Adjust perform the beginning again.
16. AUTO GAIN CONTROL OUTPUT LEVEL
ADJUSTMENT
Be sure to perform this adjustment when the optical pick-up is
replaced.
If the adjustment results becomes “Adjust NG!”, the optical pick-
up may be faulty or the servo system circuits may be abnormal.
replaced.
If the adjustment results becomes “Adjust NG!”, the optical pick-
up may be faulty or the servo system circuits may be abnormal.
16-1. CD Auto Gain Control Output Level Adjustment
Procedure:
1. Load the check disc (TDYS-1).
2. Press the
1. Load the check disc (TDYS-1).
2. Press the
. m
“R”
or
M >
“R”
button to display “AG
Set (CD)” (C11).
3. When the
ENTER/YES “R”
button is pressed, the adjustment
will be performed automatically.
“Complete!” will then be displayed momentarily when the value
is recorded in the non-volatile memory, after which the display
changes to “AG Set (CD)” (C11).
“Complete!” will then be displayed momentarily when the value
is recorded in the non-volatile memory, after which the display
changes to “AG Set (CD)” (C11).
4. Press the Z (MD) button and take out the check disc.
16-2. MO Auto Gain Control Output Level Adjustment
Procedure:
1. Load the test disc (MDW-74/GA-1).
2. Press the
1. Load the test disc (MDW-74/GA-1).
2. Press the
.
“R”
or
>
“R”
button to display “AG Set (MO)”
(C10).
3. When the
ENTER/YES “R”
button is pressed, the adjustment
will be performed automatically.
“Complete!” will then be displayed momentarily when the value
is recorded in the non-volatile memory, after which the display
changes to “AG Set (MO)” (C10).
“Complete!” will then be displayed momentarily when the value
is recorded in the non-volatile memory, after which the display
changes to “AG Set (MO)” (C10).
4. Press the Z (MD) button and take out the test disc.
47
HCD-PX333
Adjustment and checking Loacation:
Note:
It is useful to use the jig for checking the waveform. (Refer to Ser-
vicing Notes on page 9)
vicing Notes on page 9)
D101
CN101
IC101
CN105
IC151
IC190
1
7
1. I+3V
2. IOP
3. GND
4. TE
5. FE
6. VC
7. RF
2. IOP
3. GND
4. TE
5. FE
6. VC
7. RF
– BD (MD) BOARD (Component Side) –
– BD (MD) BOARD (Conductor Side) –
48
HCD-PX333
CD SECTION
Note:
1. CD Block is basically designed to operate without adjustment. There-
fore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10M
3. Use an oscilloscope with more than 10M
Ω impedance.
4. Clean the object lens by an applicator with neutral detergent when the
signal level is low than specified value with the following checks.
5. Level doesn’t change whichever with normal speed or with four times
speed.
6. Use the following jig.
• Extension jig (21 core) (Part No. J-2501-075-A)
CN101 on the BD (CD) board to CN1002 on the MD DIGITAL board
S Curve Check
Connection:
Procedure:
1. Connect an oscilloscope to test point TP (FE) and TP (VC) on
1. Connect an oscilloscope to test point TP (FE) and TP (VC) on
the BD (CD) board.
2. Turn the power on.
3. Put the disc (YEDS-18) in and turned power switch on again
3. Put the disc (YEDS-18) in and turned power switch on again
and actuate the focus search. (actuate the focus search when disc
table is moving in and out)
table is moving in and out)
4. Check the oscilloscope waveform (S-curve) is symmetrical
between A and B. And confirm peak to peak level within 3.6 ±
0.5 Vp-p.
0.5 Vp-p.
S-curve waveform
Note:
• Try to measure several times to make sure than the ratio of A : B
or B : A is more than 10 : 7.
• Take sweep time as long as possible and light up the
brightness to obtain best waveform.
Checking Location: BD (CD) board
RF Level Check
Connection:
Procedure:
1. Connect an oscilloscope to test point TP (RF) and TP (VC) on
1. Connect an oscilloscope to test point TP (RF) and TP (VC) on
the BD (CD) board.
2. Turn the power on.
3. Put the disc (YEDS-18) in to playback the number five track.
4. Confirm that oscilloscope waveform is clear and check RF sig-
3. Put the disc (YEDS-18) in to playback the number five track.
4. Confirm that oscilloscope waveform is clear and check RF sig-
nal level is correct or not.
+
–
–
BD (CD) board
TP (FE)
TP (VC)
oscilloscope
(DC range)
A
B
symmetry
within 3.6
±
0.5 Vp-p
+
–
–
BD (CD) board
TP (RF)
TP (VC)
oscilloscope
(AC range)
Note:
A clear RF signal waveform means that the shape “
◊” can be clearly
distinguished at the center of the waveform.
RF signal waveform
Checking Location: BD (CD) board
E-F Balance Check
Connection:
Procedure:
1. Connect an oscilloscpe to test point TP (TE) and TP (VC) on the
1. Connect an oscilloscpe to test point TP (TE) and TP (VC) on the
BD (CD) board.
2. Turn the power on.
3. Put the disc (YEDS-18) in to playback the number five track.
4. Press the
3. Put the disc (YEDS-18) in to playback the number five track.
4. Press the
[REPEAT STEREO/MONO]
button. (The tracking
servo and the sledding servo are turned OFF)
5. Check the level B of the oscilliscope's waveform and the A (DC
voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ± 22%
Confirm the following :
A/B x 100 = less than ± 22%
Traverse Waveform
6. Press the
[REPEAT STEREO/MONO]
button. (The tracking
servo and sledding servo are turned ON)
Confirm the C (DC voltage) is almost equal to the A (DC volt-
age) is step 5.
Confirm the C (DC voltage) is almost equal to the A (DC volt-
age) is step 5.
Traverse Waveform
Checking Location: BD (CD) board
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
TIME/DIV: 500 ns
(normal speed)
level: 1.2
±
0.2 Vp-p
+
–
–
BD (CD) board
TP (TE)
TP (VC)
oscilloscope
(DC range)
0V
B
level: 1.3
±
0.6 Vp-p
Center of
the waveform
the waveform
A (DC
voltage)
0V
Tracking servo
Sled servo
ON
C (DC
voltage)
voltage)
Tracking servo
Sled servo
OFF
49
HCD-PX333
Checking Location:
IC171
IC101
TP
(VC)
TP
(FE)
TP (TE)
TP (RF)
– BD (CD) BOARD (Conductor Side) –
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