CMT-NEZ7DAB, HCD-NEZ7 — Sony Audio Service Manual (repair manual)

Model
CMT-NEZ7DAB HCD-NEZ7
Pages
50
Size
3.73 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
cmt-nez7dab-hcd-nez7.pdf
Date

View Sony CMT-NEZ7DAB / HCD-NEZ7 Service Manual online

SERVICE MANUAL
COMPACT DISC DECK RECEIVER
HCD-NEZ7
Ver. 1.1  2007.06
SPECIFICATIONS
9-879-767-02
2007F05-1
© 2007.06
Sony Corporation
Personal Audio Division
Published by Sony Techno Create Corporation
– Continued on next page –
AEP Model
UK Model
HCD-NEZ7 is the amplifier, CD player, tape deck and
tuner section in CMT-NEZ7DAB.
Model Name Using Similar Mechanism
HCD-NEZ3
CD Section
Base Unit Name
BU-K7BD81D2
Optical Pick-up Block Name
KSM-213EDP
TAPE Section
Model Name Using Similar Mechanism
HCD-NEZ3
Tape Transport Mechanism Type
CMAL5Z231
Main unit
Amplifier section
DIN power output (rated): 11 + 11 W (6 ohms at 
1 kHz, DIN)
Continuous RMS power output (reference):
15 + 15 W (6 ohms at 
1 kHz, 10% THD)
Music power output (reference):
28 + 28 W
Inputs
AUDIO IN:
Sensitivity 250 mV, 
impedance 47 kilohms
Outputs
PHONES:
Accepts headphones with 
an impedance of 8 ohms or 
more
SPEAKER:
Accepts impedance of 6 to 
16 ohms.
CD player section
Laser Diode Properties
Emission duration: 
continuous
Laser Output: Less than 
44.6 
µ
W
(This output is the value 
measurement at a distance 
of 200 mm from the 
objective lens surface on 
the Optical Pick-up Block 
with 7 mm aperture)
Frequency response
20 Hz – 20 kHz
Tape deck section
Recording system
4-track 2-channel, stereo
Tuner section
DAB tuner section
Frequency range
Band-III:
174.928 (5A) – 
239.200 (13F) MHz
L-Band:
1,452.960 MHz (LA) – 
1,490.624 MHz (LW)
(L-Band is not available 
for the UK model.)
* For details, see “DAB frequency table” below.
Aerial terminal
75 ohms, F female
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range
87.5 – 108.0 MHz
Aerial
FM lead aerial
Aerial terminals
75 ohms unbalanced
Intermediate frequency
10.7 MHz
AM tuner section
Tuning range
531 – 1,602 kHz 
(with the tuning interval 
set at 9 kHz) 
Aerial
AM loop aerial, external 
aerial terminal
Intermediate frequency
450 kHz 
DAB frequency table
Band-III 
Frequency
Label
Frequency
Label
174.928 MHz
5A
209.936 MHz
10A
176.640 MHz
5B
211.648 MHz
10B
178.352 MHz
5C
213.360 MHz
10C
180.064 MHz
5D
215.072 MHz
10D
181.936 MHz
6A
216.928 MHz
11A
183.648 MHz
6B
218.640 MHz
11B
185.360 MHz
6C
220.352 MHz
11C
187.072 MHz
6D
222.064 MHz
11D
188.928 MHz
7A
223.936 MHz
12A
190.640 MHz
7B
225.648 MHz
12B
192.352 MHz
7C
227.360 MHz
12C
194.064 MHz
7D
229.072 MHz
12D
195.936 MHz
8A
230.784 MHz
13A
197.648 MHz
8B
232.496 MHz
13B
199.360 MHz
8C
234.208 MHz
13C
201.072 MHz
8D
235.776 MHz
13D
202.928 MHz
9A
237.488 MHz
13E
204.640 MHz
9B
239.200 MHz
13F
206.352 MHz
9C
208.064 MHz
9D
2
HCD-NEZ7
Notes on chip component replacement
Never reuse a disconnected chip component.
Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing
Keep the temperature of the soldering iron around 270 ˚C
during repairing.
Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
Be careful not to apply force on the conductor when soldering
or unsoldering.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation
exposure.
SAFETY-RELATED  COMPONENT  WARNING!!
COMPONENTS  IDENTIFIED  BY  MARK 
 0
  OR  DOTTED  LINE
WITH  MARK  
0
  ON  THE  SCHEMATIC  DIAGRAMS  AND  IN
THE  PARTS  LIST  ARE  CRITICAL  TO  SAFE  OPERATION.
REPLACE  THESE  COMPONENTS  WITH  SONY  PARTS  WHOSE
PART  NUMBERS  APPEAR  AS  SHOWN  IN  THIS  MANUAL  OR
IN  SUPPLEMENTS  PUBLISHED  BY  SONY.
The following caution label is located inside the unit.
This appliance is 
classified as a CLASS 1 
LASER product. This 
marking is located on the 
rear exterior.
L-Band 
Frequency
Label
1,452.960 MHz
LA
1,454.672 MHz
LB
1,456.384 MHz
LC
1,458.096 MHz
LD
1,459.808 MHz
LE
1,461.520 MHz
LF
1,463.232 MHz
LG
1,464.944 MHz
LH
1,466.656 MHz
LI
1,468.368 MHz
LJ
1,470.080 MHz
LK
1,471.792 MHz
LL
1,473.504 MHz
LM
1,475.216 MHz
LN
1,476.928 MHz
LO
1,478.640 MHz
LP
1,480.352 MHz
LQ
1,482.064 MHz
LR
1,483.776 MHz
LS
1,485.488 MHz
LT
1,487.200 MHz
LU
1,488.912 MHz
LV
1,490.624 MHz
LW
Note
L-Band is not available for the UK model.
General
Power requirements
AC 230 V, 50/60 Hz
Power consumption
50 W
0.3 W (in Power Saving 
Mode)
Dimensions (w/h/d) 
Approx. 164 
×
235 
×
265 mm
Mass  
Approx. 
3.6 
kg
Design and specifications are subject to change 
without notice.
3
HCD-NEZ7
TABLE  OF  CONTENTS
1.
SERVICING  NOTES
...............................................
4
2.
GENERAL
...................................................................
6
3.
DISASSEMBLY
3-1. Disassembly Flow .......................................................... 8
3-2. Cabinet ............................................................................ 8
3-3. Cabinet (Top) Section .................................................... 9
3-4. Base Unit (BU-K7BD81D2) ........................................... 9
3-5. Front Panel Section ........................................................ 1 0
3-6. Mechanical Deck (CMAL5Z231) .................................. 1 0
3-7. MAIN Board .................................................................... 1 1
3-8. Module (DAB) Tuner, Tuner Unit .................................... 1 1
4.
TEST  MODE
.............................................................. 12
5.
MECHANICAL  ADJUSTMENTS
....................... 13
6.
ELECTRICAL  ADJUSTMENTS
......................... 13
7.
DIAGRAMS
7-1.
Block Diagram – CD SERVO Section – ......................... 14
7-2.
Block Diagram – AUDIO Section – ................................ 15
7-3.
Block Diagram – PANEL/POWER SUPPLY Section – . 16
7-4.
Printed Wiring Board – CD Board – ............................... 18
7-5.
Schematic Diagram – CD Board – .................................. 19
7-6.
Printed Wiring Boards – MAIN Section – ...................... 20
7-7.
Schematic Diagram – SELECTOR Board – ................... 21
7-8.
Schematic Diagram – MAIN Section (1/2) – .................. 22
7-9.
Schematic Diagram – MAIN Section (2/2) – .................. 23
7-10. Printed Wiring Board – PANEL Board – ........................ 25
7-11. Schematic Diagram – PANEL Board (1/2) – .................. 26
7-12. Schematic Diagram – PANEL Board (2/2) – .................. 27
7-13. Printed Wiring Board – POWER Board – ....................... 28
7-14. Schematic Diagram – POWER Board – .......................... 29
8.
EXPLODED  VIEWS
8-1.
Cabinet Section ................................................................ 34
8-2.
Mechanical Deck Section ................................................ 35
8-3.
Panel Board Section ........................................................ 36
8-4.
Cabinet (Top) Section ...................................................... 37
8-5.
Chassis Section ................................................................ 38
9.
ELECTRICAL  PARTS  LIST
................................ 39
4
HCD-NEZ7
The laser diode in the optical pick-up block may suffer electrostatic
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
NOTES  ON  HANDLING  THE  OPTICAL  PICK-UP
BLOCK  OR  BASE  UNIT
SECTION  1
SERVICING  NOTES
Fig.1 Method to push the S820
S820
NOTES  ON  LASER  DIODE  EMISSION  CHECK
The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size)
LASER  DIODE  AND  FOCUS  SEARCH  OPERATION
CHECK
During normal operation of the equipment, emission of the laser
diode is prohibited unless the upper lid is closed while turning ON
the S820. (push switch type)
The following checking method for the laser diode is operable.
Method
Emission of the laser diode is visually checked.
1. Open the upper lid.
2. Push the S820 as shown in Fig.1.
Note:
Do not push the detection lever strongly, or it may be bent or damaged.
3. Press the[CD      ]button.
4. Check the object lens for confirming normal emission of the
laser diode. If not emitting, there is a trouble in the automatic
power control circuit or the optical pick-up.
In this operation, the object lens will move up and down 3
times along with inward motion for the focus search.
u
: LEAD FREE MARK
Unleaded solder has the following characteristics.
Unleaded solder melts at a temperature about 40 ˚C higher
than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 ˚C.
Caution: The printed pattern (copper foil) may peel away if
the heated tip is applied for too long, so be careful!
Strong viscosity
Unleaded solder is more viscou-s (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
NOTE  FOR  REPLACING  THE  MODULE  (DAB  TUNER)
Note:
There are two types of MODULE (DAB TUNER) in UK model.
Replace the MODULE (DAB TUNER) after confirming the type of
the MODULE (DAB TUNER) reffering to the following table.
Former Type
New Type
MODULE
(DAB TUNER)
Part No. 1-479-310-21
Part No. 1-479-954-21
COAXIAL (F TYPE)
CONNECTOR
including MODULE (DAB TUNER)
Part No. 1-820-441-11
Ver. 1.1
5
HCD-NEZ7
SERVICE  POSITION
– CD BOARD –
– TAPE MECHANICAL DECK –
CD board
cabinet (top) section
tape mechanical deck

Download Sony CMT-NEZ7DAB / HCD-NEZ7 Service Manual (Repair Manual)

Here you can view online or download Sony CMT-NEZ7DAB / HCD-NEZ7 Service Manual in pdf. This Service Manual can help you recover, restore, fix, disassemble and repair Sony CMT-NEZ7DAB / HCD-NEZ7 Audio. Information contained in Sony CMT-NEZ7DAB / HCD-NEZ7 service manual (repair manual) typically includes:

  • Disassembly, troubleshooting, programming, maintenance, remote, adjustment, installation and setup instructions.
  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).