HCD-GPX33/GPX55/GPX77/GPX88
2
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.
SAFETY CHECK-OUT
After correcting the original service problem, perform the
following 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 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 2 V AC range are suitable. (See
Fig. A)
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.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specifi ed herein may result in hazardous
radiation exposure.
1.5 k
Ÿ
0.15
—
F
AC
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
This appliance is classified as a CLASS 1
LASER product. This marking is located on
the rear exterior.
General
Power requirements
USA
model:
AC 120 V, 60 Hz
Mexican
model:
AC 120 V – 240 V, 60 Hz
Other
models:
AC 120 V – 240 V, 50/60 Hz
Power consumption
MHC-GPX88:
350
W
LBT-GPX77/MHC-GPX77:
265
W
LBT-GPX55/MHC-GPX55:
255
W
MHC-GPX33:
195
W
Dimensions (w/h/d) (excl. speakers) (Approx.)
270 mm × 363 mm × 364 mm
(10
3
⁄
4
in × 14
3
⁄
8
in × 14
3
⁄
8
in)
Mass (excl. speakers) (Approx.)
HCD-GPX88/GPX77/GPX55/GPX33: 5.2 kg
(11 lb 8 oz)
Supplied accessories
Remote control (1)
R6 (Size AA) batteries (2)
FM lead/AM loop antenna (1)
Spacer (MHC-GPX88 only) (2)
Speaker pads (MHC-GPX88 only) (16)
Speaker pads (LBT-GPX77/MHC-GPX77 only) (8)
Design and specifications are subject to change without notice.
