Sony cx bk 1 service manual

Page 1

CX-BK1

SERVICE MANUAL

Ver 1.1 2004.02

I CX-BK1 is the amplifier, CD player, tape deck
and tuner section in BMZ-K1.
- Tape deck is not loaded in US model.

US Model
AEP Model
UK Model
E Model

Licensed by BBE Sound Inc. under USP463825B. 5510752
and 5736597

TUNER

FM tuning range

FM usable sensitivity (iHF)
FM antenna terminal

AM tuning range

87.5 MHZ to 108 MHZ

13.2 URI

75 £2 (unbalanced)

530 kHz to 1710 kHz (10 kHz step)
531 kHz to 1710 kHz (9 Km step)

AM usable sensitivity 350 lem

AM antenna Loop antenna

AMPLIFIER

Powei output

US model: 110W+110W(40 H1720 kHz.

THD less than 1%. 6 9.)
140W + 140W (40 H1720 kHz.
THU 10%. 6 £2)

Chilean, Peruvian and Mexican models:
140W + 140W (1 kHz. THU
less than 1%, 6 Q.)

Model Name Using Similar Mechanism NEW
CD Mechanism Type CDM69BV-3OCBD64NS
CD Section .
Base Unit Name BU-3OCBD64NS
Optical Pick-up Name A-MAX.3
TAPE Section Model Name Using Similar Mechanism NEW
(EXCEPI US model) Tape Transport Mechanism Type CMAL1ZZ4OA
SPECIFICATIONS
CD PLAYER Power consumption
Laser Semiconductor iasei (A = 800 nm) US model: 120 W
Emission duration: continuous Chilean and PeruVian models:
D/A converter 1 bit dual 155 W
Signairtornoise ratio 85 dB (1 kHz, 0 dB) Mexican model: 160 W
Wow and liutter Unmeasuraoie Power consumption in standby mode

US model:

CASSETTE DECK (Except US model)

Tiack lormat
Frequency response
Recording system
Heads

GENERAL

Power requirements
US model.

Mexican model:

4 tiacksa 2 channels stereo
100 HZ , 10000 HZ (: 3GB)
AC Dias

Recording/playback >< 1. erase ><1 Dimensions (W/li/d)

with ECO mode on. 0.25 W
with ECO mode oil 20 W

Chilean and Mexican models:

With ECO mode on. 0.25 W
with ECO mode oil 28 W
Approx 211x 379 >< 419 mm
(B 3/3 X 15 ><16 5/3 in.)

Approx 8.6 kg (19 lbs)

Mass

US model:
120 v 60 Hz Chilean and PeruVian models:
127 V. 60 HZ

Appiox. 9.9 kg

Chilean and Peruvian models:

Total harmonic distortion
Input

Outputs

9-877-426-02
2004B05-1
© 2004.02

180W + 180W (1 kHz. THU
10%, 6 n)

008 u/u(90W.1kHZ.6 S2)
LiNE iN VIDEO, 1.0 Vprp (75 :2)
LINE IN AUDIO 11V

Aux (M0) iN 1.1V

MiC: 2.5mv (Chilean, Peruvian
and Mexican models)
SPEAKERS: 6 9. or more
PHONES: 32 $2 or more

Aux (MD) our: 500 mV
VIDEO 001:1 o Vprp (75 a)

Sony Corporation
Home Audio Company
Published by Sony Engineering Corporation

120 V/220 7230 V/240 V AC
(switchable), 50/60 Hz

Specifications and external appearance are subject to change
Without notice

COMPACT DISC RECEIVER

US model

COMPACT DISC DECK RECEIVER

AEP, UK, Chilean, Peruvian and Mexican models

Page 2

CX-BK1

Notes on chip component replacement

I Never reuse a disconnected chip component.

I Notice that the minus side ofa tantalum capacitor may be dame
aged by heat.

Flexible Circuit Board Repairing

I Keep the temperature of the soldering iron around 270 C dur-
ing repairing.

I Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).

I 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 rae
diation exposure.

The following caution label is located inside the unit.

This appliance is classified
CLASStLASER PRODucT as 3 CLASS I LASER

LUOKAN I LASER one product.

KLASS 1 LASER APPARAT

This label is located on the
rear exterior.

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)

s : LEAD FREE MARK

Unleaded solder has the following characteristics.

I 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 solderjoint 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!

I Strong viscosity
Unleaded solder is more viscou-s (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges oc-
cur such as on IC pins, etc.

I Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.

SAFETY CHECK-OUT

After correcting the original service problem, perfomr the follow-
ing 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.

LEAKAGE TEST

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 batteryoperated 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 indicaA
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex-
amples of a p' sive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V AC range are suit
able. (See Fig. A)

To Exposed Metal
Parts on Set

AC
0.15m: :' é 1.5m / voltmeter
(0.75 V)

_T_ Eaflh Ground
Fig. A. Using an AC voltmeter to check AC leakage.

SAFETY-RELATED COMPONENT WARNING I!

COMPONENTS IDENTIFIED BY MARK A OR DOTTED
LINE WITH MARK A 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 PUB-
LISHED BY SONY.