Sony hcd gn 770 service manual

Page 2

HCD-GN660/ G N770/GX9000

FRONT SPEAKER:

SURROUND SPEAKER:
(MHCAGN770/ GX9000 only)

Disc player section
System
Laser

Laser Output

Frequency response

Use only the supplied speaker
SSAGN880

Use only the supplied

speaker SS-RSSSO

Compact disc and digital audio system

Semiconductor laser

(2:780 nm)

Emission duration: continuous

Max. 44.6 pW*

*This output is the value measured
at a distance of 200 mm from the
objective lens surface on the Optical
Pick-up Block with 7 mm aperture.

2 Hz 7 20 kHz (10.5 dB)

Wave length 780 7 790 nm
Signal-to-noise ratio More than 90 dB
Dynamic range More than 90 dB
OPTICAL CD DIGITAL OUT

(MHC-GN770/GN660 only)

(Square optical connectorjack, rear panel)

Wave length
Output Level

Tape deck section
Recording system
Frequency response

Tuner section

660 nm
718 dBm

47track 2~channel stereo
50 7 13,000 Hz (:3 dB), using Sony
TYPE I tape

FM stereo, FM/AM superheterodyne tuner

FM tuner section
Tuning range

Antenna

Antenna terminals
Intermediate frequency
AM tuner section
Tuning range

87.5 7108.0 MHz
FM lead antenna
75 ohm unbalanced
10.7 MHz

North and Latin American models:

Middle Eastern models:

Other models:

Antenna
Antenna terminals
Intermediate frequency

General
Power requirements

North American models:

Australian model:
Mexican model:
Argentina models:
Other models:

Power consumption
MHC»GN770
MHCAGX9000
MHC-GN660

530 71,710 kHz

(with the interval set at 10 kHz)
531 7 1,710 kHz

(with the interval set at 9 kHz)
5317 1,602 kHz (with the interval set
at 9 kHz)

531 7 1,602 kHz (with the interval
set at 9 kHz)

530 7 1,710 kHz (with the interval
set at 10 kHz)

AM loop antenna

External antenna terminal

450 kHz

120 V AC, 60 Hz

230 7 240 V AC, 50/60 Hz

127 V AC, 60 Hz

220 V AC, 50/60 Hz

120 V, 220 V or 230 7 240 V AC, 50/
60 Hz

Adjustable with voltage selector

215 watts
235 watts
175 watts

Dimensions (w/h/d) (Approx.)
HCD-GN770/GX9000/GN660 280 x 360 x 394.5 mm

Mass (Approx.)

HCD-GN770 12.4 kg
HCD-GX9000 12.0 kg
HCD»GN660 11.5 kg

Supplied accessories: Remote Commander (1)
Batteries (2)

AM loop antenna (1)

FM lead antenna ( 1)

Front speaker pads (8)
Surround speaker pads (8)
(MHC-GN770/GX9000 only)

Design and specifications are subject to change without notice.

SAFETY CH ECK-OUT

After correcting the original service problem, perform the following
safety checks 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

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 ch s, must not exceed 0.5 mA (500 microamperes).
Leakage current can be measured by any one of three methods.

1. Acommercial 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 2V AC range are suitable. (See

Fig. A)
To Exposed Metal
Parts on Set
AC
0. 15 F :: Vol/meter
11 1.5 m (a 75 V)
5 Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.