Sony CMT-M373NT / HCD-M373 Service Manual ▷ View online
45
HCD-M373
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 and display “CPLAY2
MID”.
4. The display changes to “C =
AD =
)”.
5. Check that the C 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 39))
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 “C =
AD =
)”.
5. If the C 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
Procedure:
1. Load the continuously-recorded disc. (Refer to “5. USING
THE CONTINUOUSLY RECORDED DISC” (See page 39))
2. Press the
.
“R” or
>
“R” button to display “CPLAY2
MODE” (C36).
3. Press the ENTER/YES “R”
button to display “CPLAY2 MID”.
4. Press the
MENU/NO “R”
button when “C =
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 C error rate, the two digits after
“/ ” indicate ADER, and the 2 digits after “c =” indicate the
focus bias value.
“/ ” indicate ADER, and the 2 digits after “c =” indicate the
focus bias value.
7. Press the ENTER/YES “R”
button and display “
/
b
=
”.
Check that the C error is below 220 and ADER is below 2.
8. Press the ENTER/YES “R”
button and display “
/
a
=
”.
Check that the C error is below 220 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 C 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 properly.
Adjust perform the beginning again.
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 properly.
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
>
“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.
46
HCD-M373
Adjustment and checking Loacation:
— BD (MD) BOARD (Side A) —
— BD (MD) BOARD (Side A) —
D101
CN101
CN103
CN102
CN105
IC201
IC701
IC101
IC195
IC933
1
1
1
7
21
1
27
17
Note:
If is useful to use the jig for checking the waveform.
(Refer to Servicing Notes on page 12).
(Refer to Servicing Notes on page 12).
47
47
HCD-M373
• Waveforms
1
IC103
qg
(RFAC)
(PLAY mode)
2
IC101
us
(XTAO)
1.2 Vp-p
200mV/DIV, 400ns/DIV
29.5 ns
4.4 Vp-p
1V/DIV, 10ns/DIV
3
IC101
ek
(RF)
(PLAY mode)
1.4 Vp-p
500 mV/DIV, 200 ns
4
IC101
ef
(FE)
(PLAY mode)
approx.
460 mVp-p
460 mVp-p
200 mV/DIV, 20 ms/DIV
5
IC101
wh
(TE)
(PLAY mode)
200 mV/DIV, 20 ms/DIV
approx.
620 mVp-p
620 mVp-p
88.6 ns
4.3 Vp-p
6
IC803
8
(XOUT)
1 V/DIV, 40 ns/DIV
5.5 ns
3.3 Vp-p
7
IC803
5
(CLKA)
1V/DIV, 4 ns/DIV
8
IC101
qa
(XCOUT)
9
IC101
qd
(XOUT)
3.6 Vp-p
1 V/DIV, 10
µ
s/DIV
62.6 ns
2.8 Vp-p
1 V/DIV, 20 ns/DIV
30.5
µ
s
q;
IC702
9
(XCOUT)
qa
IC702
qa
(XOUT)
3.7 Vp-p
1V/DIV, 10
µ
s/DIV
100 ns
3.7 Vp-p
1 V/DIV, 40 ns/DIV
30.5
µ
s
qs
IC752
5
qd
IC703
wd
(XI)
4.5 Vp-p
1V/DIV, 40ns/DIV
167 ns
4.8 Vp-p
1V/DIV, 100ns/DIV
83ns
qf
IC704
ws
(XO)
3.5 Vp-p
1V/DIV, 40ns/DIV
100ns
12
µ
s
12.5 Vp-p
5 V/DIV, 4
µ
s/DIV
qg
Q642 collector (TAPE REC)
6-1. CIRCUIT BOARDS LOCATION
MAIN BOARD
PANEL BOARD
TC BOARD
BD(MD) BOARD
LOADING BOARD
BD(CD) BOARD
DIGITAL BOARD
HP BOARD
LED BOARD
REG BOARD
POWER BOARD
AMP BOARD
TRANS BOARD
SECTION 6
DIAGRAMS
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed
in each block.)
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed
in each block.)
For schematic diagrams.
Note:
• All capacitors are in µF unless otherwise noted. pF: µµF
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
f
: internal component.
•
5
: fusible resistor.
•
C
: panel designation.
For printed wiring boards.
Note:
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
•
a
: Through hole.
•
: Pattern from the side which enables seeing.
•
A
: B+ Line.
•
B
: B– Line.
•
H
: adjustment for repair.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
BD (CD) board
no mark : CD stop
tion tolerances.
BD (CD) board
no mark : CD stop
*
: Imposible to measure
BD (MD) board
no mark : MD stop
( ) : MD playback
no mark : MD stop
( ) : MD playback
*
: Imposible to measure
TC board
no mark : FM
( ) : TAPE record
no mark : FM
( ) : TAPE record
*
: Imposible to measure
Other boards
no mark : FM
< > : CD stop
no mark : FM
< > : CD stop
*
: Imposible to measure
• Indication of transistor
Caution:
Pattern face side:
Pattern face side:
Parts on the pattern face side seen from
(SIDE B)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(SIDE A)
the parts face are indicated.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
J
: CD
c
: DIGITAL IN
d
: PB (TAPE)
G
: REC (TAPE)
E
: PB (MD)
k
: REC (MD)
N
: USB
B
These are omitted.
C
E
B
These are omitted.
C
E
C
B
These are omitted.
E
Q
BD (CD) Board
BD (MD) Board
DIGITAL Board
MAIN Board
TC Board
The components identified by
mark
mark
0
or dotted line with mark
0
are critical for safety.
Replace only with part number
specified.
specified.
Les composants identifiés par
une marque
une marque
0
sont critiques
pour la sécurité.
Ne les remplacer que par une
pièce portant le numéro spécifié.
Ne les remplacer que par une
pièce portant le numéro spécifié.
48
48
HCD-M373
6-2. BLOCK DIAGRAMS
–
CD SECTION
–
: CD
• Signal Path
SYSTEM CONTROL
IC101 (1/2)
(A-MAX.3)
OPTICAL PICK-UP
BLOCK
PD1
PD2
I5-10
I1-6
LD
VC
+5V
GND
PD
VR
LD
DRIVE
FOCUS
COIL
TRACKING
COIL
Q101
RF AMP
IC103
VC
27
A
6
B
7
C
8
D
9
E
10
F
11
LD
1
PD
2
IC102
MOTOR/COIL DRIVE
VO1+
47
VO1-
52
VO2+
55
VO2-
56
F-
F+
T-
T+
35
IN1+
34
IN1-
32
IN2+
31
IN2-
27
IN3+
26
IN3-
24
IN4R
19
SW
MDP
25
SRDR
30
SFDR
29
TRDR
32
TFDR
31
FRDR
34
FFDR
33
8
STBY
DIGITAL SIGNAL PROC.
IC101
DIGITAL SERVO
64
DOUT
RFDC
43
17
FEI
28
RFDCO
16
FE
18
TE
29
RFDCI
12
SW
FE
39
TE
41
SE
40
5
XLAT
77
SQCK
8
SCLK
15
SCOR
76
SQSO
26
SSTP
71
XTAI
72
XTAO
2
XRST
LIMIT SW
X201
33.8688MHz
33.8688MHz
CD-XLT
36
CD-1-2
61
CD-1-4
35
CD-SCOR
19
CD-SQSO
32
CD-XRST
60
CD-LDON
54
7
SENS
DIN-CD
CD-SENS
56
RFAC
50
15
RFAC
26
RFC
CD-PWM1
28
CD-PWM2
26
CD-PWM3
24
23
IN4
2
4
IC105
69
XTSL
CTRL1(1-2)
1-4
CD-SQCLK
3
4
DATA
CD-DATA
35
CD-CLK
37
6
CLOK
12
3
14
15
11
13
1
5
2
4
10
9
A
B
IC104
SELECTOR
+5V
VO4+
M
VO4-
M901
(SPINDLE)
VO3+
M
VO3-
M902
(SLED)
5
10
1
2
+3.3V
REG
IC201
+3.3V
+5V
Q230, 231
SWITCH
Q236, 237
SWITCH
Q232-235
BUFFER
3
1
MOTOR DRIVE
IC220
4
9
7
2
69
CD-OUTSW
70
CD-INSW
67
CD-LOAD-OUT
68
CD-LOAD-IN
(OPEN/CLOSE)
M
M201
(LOADING)
S1
USB
SECTION
A
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