Sony HCD-ZT4 / LBT-ZT4 Service Manual ▷ View online
HCD-ZT4
21
SECTION 6
ELECTRICAL ADJUSTMENTS
1. Demagnetize the record/playback head with a head demagne-
tizer.
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
Procedure:
1. Mode:
1. Mode:
Playback
set
MIC board
PHONES jack
(J702)
PHONES jack
(J702)
+
–
level meter
test tape
P-4-A063
(6.3 kHz,
P-4-A063
(6.3 kHz,
−10 dB)
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
set
test tape
P-4-A063
(6.3 kHz,
−10 dB)
oscilloscope
V
H
waveform of oscilloscope
in phase 45
°
90
° 135° 180°
good
wrong
MIC board
PHONES jack
(J702)
PHONES jack
(J702)
4. After the adjustments, apply suitable locking compound to the
pats adjusted.
Screw
position
L-CH
peak
within
1 dB
Output
level
L-CH
peak
R-CH
peak
within
1 dB
Screw
position
R-CH
peak
DECK SECTION
0 dB = 0.775V
Adjustment Location: Record/Playback/Erase Head
CD SECTION
Note:
1. CD Block is basically designed to operate without adjustment. There-
1. CD Block is basically designed to operate without adjustment. There-
fore, check each item in order given.
2. Use YEDS-18 (PART No. 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 specifi ed value with the following checks.
TEST DISC LIST
Use the following test disc on electrical checks.
YEDS-18 (PART No. 3-702-101-01) or
PATD-012 (PART No. 4-225-203-01)
Use the following test disc on electrical checks.
YEDS-18 (PART No. 3-702-101-01) or
PATD-012 (PART No. 4-225-203-01)
S-CURVE CHECK
+
–
–
CD board
oscilloscope
(DC range)
TP106 (FE)
TP124 (VC)
Procedure:
1. Connect an oscilloscope to TP106 (FE) and TP124 (VC).
2. Turn the power ON.
3. Load a disc (YEDS-18) and actuate the focus search. (In con-
1. Connect an oscilloscope to TP106 (FE) and TP124 (VC).
2. Turn the power ON.
3. Load a disc (YEDS-18) and actuate the focus search. (In con-
sequence of open and close the disc tray, actuate the focus
search)
search)
4. Confi rm that the oscilloscope waveform (S-curve) is symmet-
rical between A and B. And confi rm peak to peak level within
1.8 ± 0.5 Vp-p.
1.8 ± 0.5 Vp-p.
Note:
•
•
Try to measure several times to make sure than the ratio of A : B or B
: A is more than 10 : 7.
: A is more than 10 : 7.
• Take sweep time as long as possible and light up the brightness to
obtain best waveform.
symmetry
S-curve waveform
within 1.8 ± 0.5 Vp-p
A
B
HCD-ZT4
22
RF LEVEL CHECK
Procedure:
1. Connect an oscilloscope to TP123 (RFO) and TP124 (VC).
2. Turn the power ON.
3. Load a disc (YEDS-18) and playback.
4. Confi rm that oscilloscope waveform is clear and check if RF
1. Connect an oscilloscope to TP123 (RFO) and TP124 (VC).
2. Turn the power ON.
3. Load a disc (YEDS-18) and playback.
4. Confi rm that oscilloscope waveform is clear and check if RF
signal level is correct or not.
Note: Clear RF signal waveform means that the shape “◊” can be clearly
distinguished at the center of the waveform.
Connecting Location: CD board
TP123 (RFO)
CD board
oscilloscope
TP124 (VC)
RF signal waveform
VOLT/DIV : 200 mV
TIME/DIV : 500 ns
TIME/DIV : 500 ns
level : 1.3 ± 0.3 Vp-p
FM TUNE LEVEL CHECK
signal
generator
set
Procedure:
1. Turn on the set.
2. Input the following signal from signal generator to FM antenna
1. Turn on the set.
2. Input the following signal from signal generator to FM antenna
input directly.
Carrier frequency : A = 87.5 MHz, B = 98 MHz, C = 108 MHz
Deviation
Deviation
: 75 kHz
Modulation
: 1 kHz
ANT input
: 35 dBu (EMF)
Note: Use 75 ohm coaxial cable to connect signal generator and the set.
You cannot use video cable for checking.
Use signal generator whose output impedance is 75 ohm.
3. Set to FM tuner function and tune A, B and C signals.
4. Confi rm “TUNED” is lit on the display for A, B and C sig-
nals.
When the selected station signal is received in good condition,
“TUNED” is displayed.
TUNER SECTION
TP106 (FE)
IC101
TP123 (RFO)
TP124 (VC)
– CD Board (Conductor Side) –
HCD-ZT4
HCD-ZT4
23
23
SECTION 7
DIAGRAMS
7-1. BLOCK DIAGRAM - CD SERVO, USB Section -
SYSTEM CONTROLLER
IC401 (1/4)
CD-MP3 PROCESSOR
IC101
MUTE
2-AXIS
DEVICE
(TRACKING)
(FOCUS)
95
89
A
+3.3V
DETECTOR
FNi1 (A)
RFo
97 FPi1 (B)
88
2
AGCi
3
RFRP
RFZi
7
6
TEi
TEZi
83
RFEQo
81 RFi
82 RFRPi
82 RFRPi
30
LO
27
RO
46
AoUT3 (PO4)
50
PIO2
65
AIN (PI4)
66
BCKi (PI5)
BCK
A-IN
BUS1-U
BUS0-U
BUS2-U
BUS3-U
BUCK-U
67
LRCKi (PI6)
LRCK
51
PIO3
GATE
49
PIO1
ST-REQ
38
BUS0
R-CH
94 FNi2 (C)
96 FPi2 (D)
100 TNi (E)
98 TPi (F)
91 LDo
92
MDi
2 VO1+
1 VO1–
13 DMo
LD
PD
LASER DIODE
OPTICAL PICK-UP
BLOCK
(KSM-213DCP)
B
C
D
E
F
12 FMo
10 TRo
9 FOo
20 IO0 (/HSO)
I-V AMP
M401
(SPINDLE)
M402
(SLED)
12 VO2–
11 VO2+
18 VO3+
17 VO3–
26 VO4+
27
7
IN4’ 24
IN3’ 20
IN2’ 9
IN1 3
BIAS 23
84 VRo
VO4–
M
M
FOCUS/TRACKING COIL DRIVE,
SLED/SPINDLE MOTOR DRIVE
IC401
S201
(LIMIT)
+3.3V
24 XO
23 XI
X102
16.9344MHz
47 CD-MMUTE
CD-L
R-CH
USB_REC-L
: CD PLAY
SIGNAL PATH
R-ch is omitted due to same as L-ch.
: TUNER (FM/AM)
: USB
VCC
A
B
C
D
E
F
LD
PD
SP+
VC
SP–
SL+
SL–
T+
T–
F+
F–
47
AoUT2 (PO5)
63
BCK (PO8)
CLK
DATA
2
1
41 CD BUS0
13
39
BUS1
3
4
42 CD BUS1
5
40
BUS2 (SO)
9
8
43 CD BUS2
45 CD CLK
6
41
BUS3 (SI)
10
11
44 CD BUS3
12
BUS SWITCH
IC670
2
1
13
3
4
5
5
9
8
6
6
10
11
12
12
BUS SWITCH
IC672
Q671
DATA SELECTOR
IC673
SELECT
42
BUCK (CLK)
4
2
3
CCE-U
46 CD CCE
43
XCCE
54
SBSY
48
PIO0
7
40 MP3 IREQ
37 USB SEL-SW
19 SBSY
19 SBSY
37
XRST
48 CD-XRST
5
REQ-U
6
12
14
13
9
10
11
1
CLK
DATA
LB
I/O0 – I/O15
D0 – D15
S-RAM
IC921
39
UB
40
OE
41
WE
17
CE
6
79
D+
80
D–
77
USBOC
USB CONTROLLER
IC901
CN1000
(USB)
3
2
1
D+
D–
78
USBPON
70
CS2
64
RD
65
WR
66
SRLLB
67
SRLUB
VBUS
VBUS POWER
ON/OFF SWITCH
IC915
5
1
4
OUT
EN
3
FLG
IN
VBUS
+5V
93 DATA
92 BCK
92 BCK
85 DATA
86 CLOCK
86 CLOCK
71 LRCK
94 GATE
97 ST-REQ
94 GATE
97 ST-REQ
55 BUS0
56 BUS1
56 BUS1
88 RXD1
87 TXD1
87 TXD1
2 DI
84 DO
1 /RESET
57 BUS2
58 BUS3
59 /BUCK
60 /CCE
96 REQ
58 BUS3
59 /BUCK
60 /CCE
96 REQ
7 – 10, 13 – 16,
29 – 32, 35 – 38
18 – 25, 28 – 35
A0 –
A15
A1 –
A16
44 – 42, 27 – 24,
21 – 18, 5 – 1
37 – 43, 46 – 54
73 X2
75 X1
X901
9MHz
AUTOMATIC
POWER
CONTROL
Q301
BCK
A-IN
LRCK
GATE
ST-REQ
GATE
ST-REQ
BUS1-U
BUS0-U
BUS2-U
BUS3-U
BUCK-U
CCE-U
REQ-U
BUS3-U
BUCK-U
CCE-U
REQ-U
35
USB TXD0
36
USB RXD0
38
USB RTS0
34
USB CTS0
33
USB RESET
A/D CONVERTER
IC501
STDO
SCLK
SCLK
AINL 2
AINR 1
9
12
LRCK
MCLK
MCLK
10
11
11
PDN
13
DATA SELECTOR
IC502
3Y
3B 10
SELECT 1
3A 11
1B 3
1A 2
2B 6
2A 5
9
1Y
4
2Y
7
A
B
CD MECHANISM
DECK
M1-
M2+
M2-
M2+
M2-
M1+
M1+ 21
M1- 18
M2+ 7
M2- 6
MOTOR
DRIVE
Q640, 641,
Q643 - 648
Q643 - 648
SW3
SW2
SW7-CHACK
SW2
SW7-CHACK
SW1
SW1 23
SW3 22
SW2 25
SW3 22
SW2 25
SW-CHUCK 24
SW5-STOCK
SW8-OPEN
SW6-CLOSE
SW-STOCK 27
SW-CLOSE 26
SW-CLOSE 26
SW-OPEN 28
(Page 24)
(Page 24)
HCD-ZT4
HCD-ZT4
24
24
7-2. BLOCK DIAGRAM - MAIN Section -
R-CH
L501
BIAS OSC
S501
(REC/PB)
PB
REC
REC AMP
IC502
PB AMP
IC501
OSC
Q501, 502
TUNER (FM/AM)
TAPE MECHANISM
DECK
AM
FM ANT
AM ANT
ST-L
ST-R
ST-DOUT
R-CH
LCH
RCH
EH
R-CH
ST-DIN
ST-CLK
ST-CE
FM75
Ω
COAXIAL
ANTENNA
AUDIO INPUT
L
R
J703
R-CH
Rch+
Lch+
TXD
DET
DET
RXD
DMPORT
CN1302
TUNED
61 ST-TUNED
45 TAPE-L
43 ST-L
21
DA
TA
22
CLK
42
30
AUX-L
46 MIC
29 VOLINL
TONEOUTL
26
OUTL
44 CD-L
41 DMPORT-L
DMPOR
T DET
TC-T
APE ST
ATE
67 ST-DOUT
66 ST-CLK
63 ST-CE
63 ST-CE
57
MC RXD
32
MC TXD
31
82
13
14
5
6
7
6
7
R2A15216FP-DA
TA
60
9
SA2
POWER ILLUMINET
OR
68
VACS IN
89
R2A15216FP-CLK
59
MIC/HP
DET
71
23
SWOUT
28
BB1L
36
RECBL
37
RECAL
BAND-PASS
FILTER
Q115, 116
R-CH
27
BB2L
BASS AGC
Q128
D630
D201
INPUT SELECTOR,
ELECTRICAL VOLUME
IC407
SYSTEM CONTROLLER
IC401 (2/4)
: TUNER (FM/AM)
: CD PLAY
SIGNAL PATH
R-ch is omitted due to same as L-ch.
: TAPE PLAY
: TAPE REC
: AUDIO IN
: MIC
: DMPORT
J700
MIC
RV700
MIC LEVEL
MIC AMP
IC700 (1/2)
LINE AMP
IC1300
MIC AMP
IC700 (2/2)
SW
C
HP IN
A
CD-L
B
USB_REC-L
E
SW OUT
F
BASS AGC
D
OUT
LINE AMP
IC251
65 ST-DIN
(Page 25)
(Page 23)
(Page 23)
(Page 25)
(Page 25)
(Page 25)
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