HCD-GN660, HCD-GN770, HCD-GX9000, MHC-GN660, MHC-GN770, MHC-GX9000 - Sony Audio Service Manual (repair manual). Page 2

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FRONT SPEAKER:

Use only the supplied speaker
SS-GN880

SURROUND SPEAKER:

Use only the supplied

(MHC-GN770/ GX9000 only) speaker SS-RS880

System

Compact disc and digital audio system

Laser

Semiconductor laser
(

λ

=780 nm)

Emission duration: continuous

Laser Output

Max. 44.6 

µ

W*

*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.

Frequency response

2 Hz – 20 kHz (

±

0.5 dB)

Wave length

780 – 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 connector jack, rear panel)
Wave length

660 nm

Output Level

–18 dBm

Recording system

4-track 2-channel stereo

Frequency response

50 – 13,000 Hz (

±

3 dB), using Sony

TYPE I tape

FM stereo, FM/AM superheterodyne tuner

FM tuner section

Tuning range

87.5 – 108.0 MHz

Antenna

FM lead antenna

Antenna terminals

75 ohm unbalanced

Intermediate frequency

10.7 MHz

AM tuner section

Tuning range
North and Latin American models:

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

Middle Eastern models:

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

Other models:

531 – 1,602 kHz (with the interval
set at 9 kHz)
530 – 1,710 kHz (with the interval
set at 10 kHz)

Antenna

AM loop antenna

Antenna terminals

External antenna terminal

Intermediate frequency

450 kHz

Power requirements
North American models:

120 V AC, 60 Hz

Australian model:

230 – 240 V AC, 50/60 Hz

Mexican model:

127 V AC, 60 Hz

Argentina models:

220 V AC, 50/60 Hz

Other models:

120 V, 220 V or 230 – 240 V AC, 50/
60 Hz
Adjustable with voltage selector

Power consumption
MHC-GN770

215 watts

MHC-GX9000

235 watts

MHC-GN660

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.

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.

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 2V AC range are suitable. (See
Fig. A)

µ

Ω