Sony CMT-NEZ50 / HCD-NEZ50 Service Manual ▷ View online
13
HCD-NEZ50
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.
so that outputs match within 1dB of peak.
3. Mode: Playback
4. After the adjustments, apply suitable locking compound to
the pats adjusted.
Adjustment Location: Record/Playback/Erase Head
1. Demagnetize the record/playback head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
TEST TAPE
Tape
Signal
Used for
P-4-A063
6.3 kHz, -10 dB
Azimuth Adjustment
RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT
Note:
Remove the cassette lid assy before this adjustment.
Procedure:
1. Mode: Playback
0 dB=0.775 V
DECK SECTION
set
HEAD PHONE board
PHONES jack
(J500)
PHONES jack
(J500)
+
–
–
level meter
test tape
P-4-A063
(6.3 kHz, –10 dB)
P-4-A063
(6.3 kHz, –10 dB)
set
test tape
P-4-A063
(6.3 kHz, –10 dB)
P-4-A063
(6.3 kHz, –10 dB)
oscilloscope
V
H
waveform of oscilloscope
in phase 45
°
90
°
135
°
180
°
good
wrong
HEAD PHONE board
PHONES jack
(J500)
PHONES jack
(J500)
Screw
position
position
L-CH
peak
peak
within
1dB
1dB
Output
level
level
L-CH
peak
peak
R-CH
peak
peak
within
1dB
1dB
Screw
position
position
R-CH
peak
peak
SECTION 6
ELECTRICAL ADJUSTMENTS
14
HCD-NEZ50
CD SECTION
Note:
1.
CD Block is basically constructed to operate without adjustment.
2.
Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3.
Use an oscilloscope with more than 10 M
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.
Check the focus bias check when optical pick-up block is replaced.
FOCUS BIAS CHECK
Procedure :
1. Connect oscilloscope to TP (RFACI) and TP (VC) on the CD
board.
2. Press the
I/
1 button to turn the power ON.
3. Set disc (YEDS-18) on the tray and press the
CD
u button
to playback.
4. Confirm that oscilloscope waveform is as shown in the figure
below. (eye pattern)
A good eye pattern means that the diamond shape (
◊
) in the
center of the waveform can be clearly distinguished.
Checking Location:
+
–
–
CD board
TP (RFACI)
TP (VC)
TP (VC)
oscilloscope
(DC range)
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
TIME/DIV: 500 ns
level:
0.9
0.9
±
0.4 Vp-p
TP
(VC)
TP
(RFACI)
IC201
– CD Board (Conductor Side) –
HCD-NEZ50
15
15
HCD-NEZ50
SECTION 7
DIAGRAMS
7-1. BLOCK DIAGRAM – CD SERVO Section –
OPTICAL
PICK-UP BLOCK
(KSM-213CDP)
CH2OUTF
CH2FIN
FOCUS/TRACKING COIL DRIVER,
SLED/SPINDLE MOTOR DRIVER
IC402
12
6
CH2OUTR
11
CH1OUTR
13
CH1OUTF
14
CH3OUTF
17
CH3OUTR
18
SL–
SL+
TRK–
TRK+
FCS–
FCS+
2-AXIS
DEVICE
PD
LD
B
A
D
C
F
E
M402
(SLED)
M
CH4OUTF
16
CH4OUTR
15
CH2RIN 7
CH1RIN 5
CH1FIN 4
CH3FIN 23
CH3RIN 22
OPIN+ 3
CH4IN 24
OPOUT 27
FFDR
45
PD
67
F
51
E
50
D
60
C
59
B
58
A
57
LD
66
FRDR
46
TRDR
44
TFDR
43
SFDR
41
SRDR
42
MDP
38
SP–
SP+
M401
(SPINDLE)
M
CD DSP
IC201
SYSTEM CONTROLLER
IC801 (1/2)
XTAI 109
XTAO 108
SSTP 39
X201
16.9344MHz
S201
(LIMIT)
D +3.3V
CD
RFACO
AOUT1 112
AOUT2 117
70
RFACI
71
XRST
8
MUTE
20
XTACN 7
SSTB-MP3 85
ACK-MP3 15
I-MP3-ACK
50
A
AUTOMATIC
POWER CONTROL
Q321
O-MP3-SSTB
11
O-CD-XTACN
34
O-CD-XRST
3
O-MP3-SSTB
11
IREQ-MP3 10
REQ-MP3 14
XLAT-MP3 13
CLK2 90
O-MP3-CLK
6
O-MP3-XLAT
10
O-MP3-REQ
12
I-MP3-REQ
49
DATA2 12
SCOR 26
I-CD-SCOR
43
O-MP3-DATA
5
I-MP3-DATA
7
SENS 20
XLAT 16
CLOK 11
DATA 89
O-CD-DATA
31
O-CD-CLK
30
O-CD-XLAT
8
I-CD-SENS
29
R-CH
• SIGNAL PATH
: CD PLAY
• R-ch is omitted due to same as L-ch.
(Page 16)
HCD-NEZ50
16
16
HCD-NEZ50
7-2. BLOCK DIAGRAM – MAIN Section –
AC
DETECT
Q333, 338
R-CH
+
18
INPUT SELECT,
ELECTRICAL VOLUME
IC302
19
28
RECO-L
18
OUT-L
13
CONT
21 CD-L
23 ST-L
2 TC-L
19 AUX-L
REC/PB
SWITCH
Q326 – 329,
Q332, 334, 335
R-CH
CD
A
• SIGNAL PATH
: CD PLAY
: TAPE PLAY
: REC
• R-ch is omitted due to same as L-ch.
: TUNER
J251
AUDIO IN
: AUX IN
J500
PHONES
SPEAKER
+
–
–
–
+
R
L
J302
TUNER (FM/AM)
L-OUT
R-OUT
CE
CE
R-CH
ST (TUNED)
TUNED
DI
DO
DO
DI
CLK
CLK
CE
TUNED
DO
DI
CLK
RDS DATA
RDS DATA
RDS CLK
RDS CLK
BIAS OSC
T301
REC BIAS
SWITCH
Q347, 348
M +10V
BIAS OSC
Q344
ERASE
HRPE301
(REC/PB/ERASE)
TAPE MECHANISM
DECK BLOCK
L-CH
R-CH
R-CH
DC
DETECT
Q342, 343
DC
DETECT
Q318 – 320
+
POWER
AMP
IC501
33
I-TU-DO
56
O-TU-CLK
55
O-TU-CE
24
I-TU-SD (TUNED)
57
O-TU-DI
RDS DATA
27
I-TU-RDS-DATA
RDS CLK
45
I-TU-RDS-CLK
O-TC-REC/PLAY
O-TC-BIAS
36
I-P-MONI
4
O-FUNCTION
IC-DATA
2
STK-ON
CAPSTAN/REEL
MOTOR DRIVE
Q804, 805
PLUNGER
DRIVE
Q802, 803
M M
(CAPSTAN/REEL)
(DECK-A)
SOL
10V
MOTOR
10V
PACK
REC
END SW
I-TC-END SW
38
21
I-TC-REC/PLAY SW
22 O-TC-SOL
23 O-TC-MOTOR
I-RMC (SIRCS)
9
SYSTEM CONTROLLER
IC801 (2/2)
D307
D320
(AC IN)
SUB POWER
TRANSFORMER
T901
MAIN POWER
TRANSFORMER
T902
SYS +3.3V
RECT
D911 – 914
D809
D303, 304
D922, 923
D920, 936
AMP B+
TO
POWER AMP
AMP B–
+3.3V
REGULATOR
IC901
+9V
REGULATOR
IC303
+10V
REGULATOR
IC900
D +3.3V
+4V
REGULATOR
IC903
RECT
D916, 917
RECT
D918, 919
RECT
D907 – 910
AM
ANTENNA
FM ANT
AM ANT
ANT GND
ANT GND
FM 75
Ω
COAXIAL
VOLTAGE
DETECT
IC803
MAIN POWER
RELAY DRIVE
RELAY DRIVE
Q315
D +3.3V
A +9V
M +10V
M +7V
46
O-POWER
42
I-AC-CUT
54
RESET
REMOTE CONTROL
RECEIVER
IC802
LED DRIVE
Q808
D804, 805
(LCD BACK LIGHT)
O-LED-STBY
17
BACK LIGHT
25
D806
X801
32.768kHz
14
13
X1A
X0A
93
92
X802
4.19MHz
XO
XI
LCD801
LIQUID
CRYSTAL
DISPLAY
48 I-RE-VOL
28 I-SW_CD-LID
ROTARY
ENCODER
RV801
VOLUME
STANDBY
S801 – 814
(FRONT PANEL KEYS)
S820
(CD LID OPEN/CLOSE DETECT)
I-KEY0/WAKE-UP,
I-KEY_1
I-KEY_1
41, 37
COM0 – COM1
59 – 62
SEG0 – SEG32
63, 64, 67 – 89, 94 – 100, 1
RESET
SWITCH
Q801
AC DETECT
Q807
RY901
CD +1.8V
+1.8V
REGULATOR
IC203
(AEP, UK, MX, AR, KR)
(AEP, UK, MX, AR, KR)
(E, E51)
VOLTAGE
SELECTOR
S901
• Abbreviation
AR
: Argentina model
E51
: Chilean and Peruvian models
KR
: Korean model
MX
: Mexican model
M301
(FAN)
(FAN)
FAN MOTOR
DRIVE
Q316, 317
M
M
D313
(AEP, UK)
(AEP, UK)
(Page 15)
Ver. 1.3
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