HCD-CZ1, NAS-CZ1 - Sony Audio Service Manual (repair manual)

US Model

AEP Model

UK Model

2005H05-1
© 2005.08

Model Name Using Similar Mechanism

NEW

CD Base Unit Name

BU-K7BD81B

Optical Pick-up Block Name

KSM-213EDP

•

HCD-CZ1 is the amplifier, CD player
and tuner section in NAS-CZ1.

POWER OUTPUT AND TOTAL HARMONIC 
DISTORTION:
With 6-ohm loads, both channels driven, from 
120 – 10,000 Hz; rated 10 watts per channel 
minimum RMS power, with no more than 10% 
total harmonic distortion from 250 milli watts to 
rated output.

DIN power output (rated): 7.5 + 7.5 watts

(6 ohms at 1 kHz, DIN)

Continuous RMS power output (reference):

10 + 10 watts 
(6 ohms at 1 kHz, 10% 
THD)

Inputs
ANALOG IN (mini jack): Sensitivity 450 mV, 

impedance 10 kilohms

Outputs
PHONES (mini jack):

accepts headphones with 
an impedance of 8 ohms or 
more

System

Compact disc and digital 
audio system

Laser

Semiconductor laser 
(

λ

=770 – 810 nm)

Emission duration: 
continuous

Frequency response

2 Hz – 20 kHz (

±

0.5 dB)

FM stereo, FM/AM superheterodyne tuner

FM tuner section

Tuning range
U.S.A. model:

87.5 – 108.0 MHz 
(100-kHz step)

European models:

87.5 – 108.0 MHz 
(50-kHz step)

Antenna

FM lead antenna

Antenna terminals

75 ohms unbalanced

Intermediate frequency

10.7 MHz

AM tuner section

Tuning range
U.S.A. model:

530 – 1,710 kHz
(with the tuning interval 
set at 10 kHz)
531 – 1,710 kHz
(with the tuning interval 
set at 9 kHz) 

European model:

531 – 1,602 kHz 
(with the tuning interval 
set at 9 kHz) 

Antenna

AM loop antenna

Antenna terminals

External antenna terminal

Intermediate frequency

450 kHz 

Speaker system

2-way, Acoustic 
Suspension type

Speaker units
Woofer:

9 cm dia., cone type

Tweeter:

2.5 cm dia., balanced-
dome-type

Nominal impedance

6 ohms

Power requirements
U.S.A. model:

120 V AC, 60 Hz

European model:

230 V AC, 50/60 Hz

Power consumption
U.S.A. model:

40 watts

European model:

40 watts 
0.3 watts (in Power Saving 
mode)

Dimensions (w/h/d) incl. projecting parts and controls 

Approx. 460 

×

 175 

×

190 mm

Mass

Approx. 5.3 kg

Supplied accessories

Remote Commander with 
battery (1)
AM loop antenna (1)
FM lead antenna (1)
Network cable (1)
M-crew Server CD-ROM 
(1)

Design and specifications are subject to change 
without notice.

2

•

Never reuse a disconnected chip component.

•

Notice that the minus side of a tantalum capacitor may be

damaged by heat.

•

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.

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation
exposure.

After correcting the original service problem, perform the following
safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage.
Check leakage as described below.

The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes.).
Leakage current can be measured by any one of three methods.

1. A commercial leakage tester, such as the Simpson 229 or RCA

WT-540A. Follow the manufacturers’ instructions to use these
instruments.

2. A battery-operated AC milliammeter. The Data Precision 245

digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a

VOM or battery-operated AC voltmeter. The “limit” indication
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples
of a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2 V AC range are suitable.  (See
Fig. A)

Ω

µ

 0

0

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
bottom exterior.

3

................................................................. 4

.......................................................................... 15

3-1.

Disassembly Flow ............................................................ 17

3-2.

Speaker Grill (F/R) Assy, Top Panel Assy ........................ 18

3-3.

Cover Bottom Assy ........................................................... 18

3-4.

Rear Panel Section ............................................................ 19

3-5.

Front Panel Section .......................................................... 20

3-6.

Top Panel Section ............................................................. 20

3-7.

Base Unit (BU-K7BD81B) .............................................. 21

3-8.

MAIN Board Section ........................................................ 21

3-9.

ETHER Board, MAIN Board ........................................... 22

...................................................................... 23

................................. 26

6-1.

Block Diagram  – SERVO Section – ................................ 27

6-2.

Block Diagram  – Ethernet Section – ............................... 28

6-3.

Block Diagram  – MAIN Section – .................................. 29

6-4.

Printed Wiring  Board  – CD Board – .............................. 31

6-5.

Schematic Diagram  – CD Board – .................................. 32

6-6.

Printed Wiring Board  – ETHER Board – ........................ 33

6-7.

Schematic Diagram  – ETHER Board – ........................... 34

6-8.

Printed Wiring Board
– MAIN Board (Component Side) – ................................ 35

6-9.

Printed Wiring Board
– MAIN Board (Conductor Side) – .................................. 36

6-10. Schematic Diagram  – MAIN Board (1/2) – .................... 37
6-11. Schematic Diagram  – MAIN Board (2/2) – .................... 38
6-12. Printed Wiring Boards  – Power Section – ....................... 39
6-13. Schematic Diagram  – Power Section – ........................... 40
6-14. Printed Wiring Boards  – Panel Section – ........................ 41
6-15. Schematic Diagram  – Panel Section – ............................ 42
6-16. Printed Wiring Board  – FL Board – ................................ 43
6-17. Schematic Diagram  – FL Board – ................................... 44

7-1.

Speaker Grill, Top Panel Section ...................................... 54

7-2.

Front Panel Section .......................................................... 55

7-3.

Rear Panel Section ............................................................ 56

7-4.

CD Panel Section .............................................................. 57

7-5.

PSAMP Board Section ..................................................... 58

7-6.

MAIN Board Section ........................................................ 59

7-7.

Base Unit (BU-K7BD81B) .............................................. 60

......................................... 61

4

MODEL

Power Voltage Incdication

US model

AC: 120 V 60 Hz 25 W

AEP, UK models

AC: 230 V - 50/60 Hz 25 W

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.

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)

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.

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.

During normal operation of the equipment, emission of the laser
diode is prohibited unless the upper lid is closed while turning ON
the S601. (push switch type)
The following checking method for the laser diode is operable.

•

1. Open the upper lid.
2. Push the S601 as shown in Fig.1.

Do not push the detection lever strongly, or it may be bent or damaged.

3. Press the

B

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 2

times along with inward motion for the focus search.