Sony hcd gnx 70 service manual

Page 2

HCD-GNX60/G NX70/GX9900

Tape deck section
Recording system
Frequency response

4-track 2-channe1 stereo
50 -13,000 Hz (:3 dB),
using Sony TYPE I tape

Tuner section

FM stereo, FM/AM superheterodyne tuner
FM tuner section

Tuning range

Antenna

Antenna terminals

Intermediate frequency

AM tuner section

Tuning range

North and Latin American models:
530 - 1,710 kHz

(with the interval set at 10 kHz)
53 1 - 1,710 kHz

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

(with the interval set at 9 kHz)
530 - 1,710 kHz

(with the interval set at 10 kHz)
AM loop antenna

External antenna terminal

450 kHz

87.5 - 108.0 MHz
FM lead antenna
75 ohm unbalanced
10.7 MHz

Other models:

Antenna
Antenna terminals
Intermediate frequency

General

Power requirements
North American model:
Australian model:
Argentina model:
Other models:

120 V AC, 60Hz

230 - 240 V AC, 50/60 Hz

220 V AC, 50/60 Hz

120V, 220V or 230- 24OVAC, 50/60Hz
Adjustable with voltage selector
Power consumption

MHC-GX9900 250 watts
MHC-GNX70 225 watts
MHC-GNX60 200 watts

Dimensions (w/h/d) (Approx) 280 x 360 x 398.5 mm
Mass (Approx)

HCD-GNX70 12.1 kg
HCD-GX9900 11.8 kg

HCD-GNX6O 11.3 kg

Design and specifications are subject to change without notice.

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 soldering iron around 270C
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.

This appliance is classified as
a CLASS 1 LASER product.
This label is located on the rear
exterior.

CLASS 1 LASER PRODUCT
LUOKAN I LASERLAITE

KLASS 1 LASERAPFARAT

SAFETY-RELATED COMPONENT WARNINGII

COMPONENTS IDENTIFIED BY MARK A OR DOTTED LINEWITH
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
PUBLISHED BY SONY.

2

SAFETY CHECK-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 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)

Ta Exposed Metal
Parts on Set

AC

Voltmeter
1.5m 9] (W

5 Earth Ground

Fig. A. Using an AC voltmeter to check AC leakage.

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.)

1'- : 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 viscous (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.