Sony CMT-NEZ7DAB / HCD-NEZ7 Service Manual ▷ View online
11
HCD-NEZ7
3-7. MAIN BOARD
3-8. MODULE (DAB) TUNER, TUNER UNIT
4
two connectors
(CN902, CN903)
(CN902, CN903)
7
flexible flat (15 core) cable
(CN319)
(CN319)
5
screw (BVTP 3
×
8)
2
screw (BVTP 3
×
8)
6
1
spacer
3
ground plate
8
MAIN board
3
two screws
(BVTT 3
(BVTT 3
×
6)
3
three screws
(BVTT 3
(BVTT 3
×
6)
1
connector
(CN700)
(CN700)
4
7
two screws
(BVTP 3
(BVTP 3
×
8)
8
6
POWER board section
5
power cord connector
(CN901)
(CN901)
q;
tuner unit
9
wire (flat type) (15 core)
9
wire (flat type) (5 core)
(CN716)
(CN716)
2
module (DAB) tuner
12
HCD-NEZ7
COLD RESET
The cold reset clears all data including preset data stored in the
memory to initial conditions. Execute this mode when returning
the set to the customer.
Procedure:
memory to initial conditions. Execute this mode when returning
the set to the customer.
Procedure:
1. In the standby status, press the
I/
1
button to turn the power
on.
2. While pressing the
x
button, press the
I/
1
button.
3. The set is reset, and become standby status.
SECTION 4
TEST MODE
CD ERROR HISTORY
This mode can be used for CD error history display.
Procedure:
1. Press the
CD
u
button to select CD function.
2. Press two buttons of [DSGX] and
CD
u
for two seconds
simultaneously.
3. CD error history is displayed on the liquid crystal display. Each
time
m
or
M
button on the remote commander is pressed,
CD error history is changed.
PANEL TEST MODE
Enter The Panel Test Mode
Procedure:
1. In the standby status, press two buttons of [DSGX], and
lm
for two seconds simultaneously.
2. When the panel test mode is activated, LEDs and segments of
liquid crystal display are all turned on.
Version Check
Procedure:
1. In the panel test mode (all LEDs and segments of liquid crystal
display are turned on), press the [TUNER / BAND] button.
2. Destination indication and model type indication are displayed
on the liquid crystal display.
3. From this status, each time the [TUNER / BAND] button is
pressed, it changes the version display of each module
cyclically as follows.
cyclically as follows.
Display
Module
MC
Main controller
GC
Display
CD
CD system
CDD
CD device master
CDMA
CDM upper module
CDMB
CDM lower module
BDA
BD upper module
BDB
BD lower module
ST
Tuner
TA
Amplifier
TM
Timer
TC
Tape
4. To date of any module, press the [DSGX] button.
5. To release from this mode, press two buttons of [DSGX]
5. To release from this mode, press two buttons of [DSGX]
and
lm
for two seconds simultaneously.
Key Check
Procedure:
1. In the panel test mode (all segments of liquid crystal display
are turned on), press the [PLAY MODE / TUNING MODE] button.
2. It displays “K 0 V0” on the liquid crystal display.
3. Each time a button is pressed, “K” value increases. However,
3. Each time a button is pressed, “K” value increases. However,
once a button is pressed, it is no longer taken into account.
All keys are pressed, display becomes “K13”.
4. “V” value increases like 0, 2, 4... or 1, 3, 5... if turn the
[VOLUME] knob clockwise, or it decreases like 0, 8, 6... or 1,
9, 7... if turn the knob counterclockwise.
9, 7... if turn the knob counterclockwise.
5. To release from this mode, press two buttons of [DSGX]
and
lm
for two seconds simultaneously.
HCD-NEZ7
13
13
HCD-NEZ7
SECTION 5
MECHANICAL ADJUSTMENTS
SECTION 6
ELECTRICAL ADJUSTMENTS
•
Precaution
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head
pinch roller
erase head
rubber belts
capstan
idlers
2. Demagnetize the record/playback head with a head
demagnetizer. (Do not bring the head magnetizer close to the
erase head.)
erase head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, appiy suitable locking compound to
4. After the adjustments, appiy suitable locking compound to
the parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
•
Torque Measurement
Mode
Torque Meter
Meter Reading
2.95 – 6.86 mN
⋅
m
FWD
CQ-102C
(30 – 70 g
⋅
cm)
(0.42 – 0.97 oz
⋅
inch)
FWD
0.15 – 5.39 mN
⋅
m
Back Tension
CQ-102C
(1.5 – 5.5 g
⋅
cm)
(0.021 – 0.076 oz
⋅
inch)
more than 5.89 mN
⋅
m
FF
CQ-201B
(more than 60 g
⋅
cm)
(more than 0.83 oz
⋅
inch)
more than 5.89 mN
⋅
m
REW
CQ-201B
(more than 60 g
⋅
cm)
(more than 0.83 oz
⋅
inch)
•
Tape Tension Measurement
Mode
Tension Meter
Meter Reading
FWD
CQ-403A
more than 100 g
(more than 3.53 oz)
0 dB=0.775 V
DECK SECTION
Procedure:
1. Mode: Playback
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)
1. Demagnetize the record/playback head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
•
Test Tape
RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT
Note:
Remove the cover (azimuth) before this adjustment.
Tape
Signal
Used for
P-4-A063
6.3 kHz, -10 dB
Azimuth Adjustment
3. Mode: Playback
4. After the adjustments, apply suitable locking compound to
the pats adjusted.
Adjustment Location: Record/Playback/Erase Head
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)
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.
signal level is low than specified value with the following checks.
5.
Check the focus bias check when optical block is replaced.
FOCUS BIAS CHECK
Procedure :
1. Connect the oscilloscope to TP (RFACO) and TP (VC) on the
CD board.
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the
3. Press the
CD
u
button.
4. Confirm that the oscilloscope waveform is as shown in the
figure below. (eye pattern)
A good eye pattern means that the diamond shape (
A good eye pattern means that the diamond shape (
◊
) in the
center of the waveform can be clearly distinguished.
•
RF signal reference waveform (eye pattern)
Checking Location:
TP
(RFACO)
TP (VC)
– CD BOARD (Conductor Side) –
+
–
–
CD board
TP (RFACO)
TP (VC)
TP (VC)
oscilloscope
(DC range)
VOLT/DIV: 0.2 V (with the 10: 1 probe in use.)
TIME/DIV: 500 ns
TIME/DIV: 500 ns
1.1
When observing the eye pattern, set the oscilloscope
for AC range and raise vertical sensitivity.
for AC range and raise vertical sensitivity.
0.2 Vp-p
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.
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
CD SECTION
HCD-NEZ7
14
14
HCD-NEZ7
SECTION 7
DIAGRAMS
7-1. BLOCK DIAGRAM – CD SERVO Section –
MIACK
8
PO11/BUCK/AD14
36
MILP
5
RESET
2
MICS
4
MIDIO
6
MICK
7
MP3 DECODER
IC301
A/D
CONVERTER
CH2OUTF
CH2OUTR
23
24
21
4
5
6
7
17
18
16
15
RFACI
ASYO
ASYI
FILTER
FILO
PCO
CLTV
FILI
DIGITAL PLL
ASYMMETRY
CORRECTOR
EFM
DEMODULATOR
CD DSP
IC101 (1/2)
MDP
DIGITAL
CLV
PROCESSOR
32K
RAM
ERROR
CORRECTOR
INTERNAL BUS
SQCK
SQSO
EXCK
AOUT1
C4M
XTSL
XTAO
XTAI
AOUT2
R-CH
D/A
DIGITAL
INTERFACE
D/A
CONVERTER
SELECTOR
CLOCK
GENERATOR
SUBCODE
PROCESSOR
SCOR
WFCK
XUGF
GFS
EMPH
SENS
DATA
CLOCK
XLAT
SBSO
CD SENS
CD DATA
CD XLT
TEI
FEI
FOCUS/
TRACKING/SLED
SERVO DSP
FOCUS/TRACKING/SLED
PWM GENERATOR
SFDR
CH3FIN
CH4IN
CH3RIN
CH3OUTF
CH3OUTR
CH1FIN
CH1RIN
CH2FIN
CH2RIN
20
MUTE
SRDR
TFDR
TRDR
FFDR
FRDR
SSTP
COUT
MIRR,
DFCT, FOK
DETECTOR
SERVO AUTO
SEQUENCER
SERVO
INTERFACE
CPU INTERFACE
SCLK
TO CPU INTERFACE
FOK
MIRR
DFCT
2
OPIN+
CH4OUTF
CH4OUTR
27
OPOUT
M101
(SPINDLE)
MOTOR
DRIVE
MOTOR
DRIVE
COIL
DRIVE
CH1OUTF
CH1OUTR
COIL
DRIVE
M
M
M102
(SLED)
MOTOR/COIL DRIVE
IC251
2-AXIS
DEVICE
(TRACKING)
(FOCUS)
CD DSP
IC101 (2/2)
•
SIGNAL PATH
: CD PLAY
14
13
11
12
CD SCOR
A
CD
13
11
12
9
10
14
119
108
21 23
3
1
2
7
TO SERVO AUTO
SEQUENCER
42
51 53
XPCK
112
50 52
45
46
6
XRST
100
XRST
50
96 97
81
78
117
93
77
86
98 99
115
107
102 105 104
110 111 113 68
35
CD CLK
37 51
LRCK
BCK
PCMD
LRCKIA
SDI0
63 66 65
16
BCKIA
15
SFSY/LRCKIB
19
SBSY/BCKIB
18
14
LRCKI
BCKI
PCMDI
SDO0
62 60 61
11
36 19
26
27
28
29
24
22
20
19
37
36
E
B
A
D +3.3V
F
DETECTOR
A
B
C
D
RF
SUMMING
AMP
FOCUS
ERROR
AMP
TRACKING
ERROR AMP
RFACO
FEO
TEO
E
F
AUTOMATIC
POWER
CONTROL
Q10
APC LD
AMP
LD
LD
PD
LASER DIODE
OPTICAL PICK-UP
BLOCK
(KSM-213EDP)
PD
I-V AMP
D
C
EQ_
IN
41
35
34
EQ
AC_
SUM
RFAC
VCA
X171
16.9344MHz
SYSTEM CONTROLLER
IC801 (1/3)
S101
(LIMIT)
MP3 DATA IN 6
MP3 DATA OUT 5
MP3 CLK 7
MP3 CS 57
MP3 ACK 56
MP3 REQ 53
MP3 LP 54
MP3 RESET 58
CD XTCN 43
STANDBY
3
MP3 STBY 55
• R-ch is omitted due to same as L-ch.
XTACN
95
(Page 15)
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