Leakage Test - Sony HCD-GNX60 Service Manual

HCD-GNX60/GNX70/GX9900
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Tape deck section
Recording system
Frequency response
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:
Other models:
Antenna
Antenna terminals
Intermediate frequency
General
Power requirements
North American model:
Australian model:
Argentina model:
Other models:
Power consumption
MHC-GX9900
MHC-GNX70
MHC-GNX60
TE
L 13942296513
Dimensions (w/h/d) (Approx.)
Mass (Approx.)
HCD-GNX70
HCD-GX9900
HCD-GNX60
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 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.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous
radiation exposure.
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SAFETY-RELATED COMPONENT WARNING!!
.
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH
MARK 0 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.
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4-track 2-channel stereo
50 – 13,000 Hz (±3 dB),
using Sony TYPE I tape
87.5 – 108.0 MHz
FM lead antenna
75 ohm unbalanced
10.7 MHz
530 – 1,710 kHz
(with the interval set at 10 kHz)
531 – 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
120 V AC, 60Hz
230 – 240 V AC, 50/60 Hz
220 V AC, 50/60 Hz
120 V, 220 V or 230 – 240 V AC, 50/60 Hz
Adjustable with voltage selector
250 watts
225 watts
200 watts
280 × 360 × 398.5 mm
12.1 kg
11.8 kg
11.3 kg
This appliance is classified as
a CLASS 1 LASER product.
This label is located on the rear
exterior.
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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)
To Exposed Metal
Parts on Set
Q Q
3 6 7 1 3
0.15 µF
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.)
: 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!
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• 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.
2 9 9 4 2 8
1 5 0 5 8 2 9 9 4
AC
Voltmeter
1.5 kΩ
(0.75 V)
Earth Ground
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