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-k SAFETY INSTRUCTIONS
PRECAUTIONS DURING SERVICING
1. Parts identiļ¬ed by the A (*l symbol are critical for
salety. Replace them onlywith the parts number specified.
2. In addition to safety, other parts and assemblies are
speciļ¬ed tor conformance with such regulations as
those applying to spurious radiation. These must also
be replaced only with the specified replacements.
Examples: RF converters. tuner units, antenna selector
switches, RFcabIes, noise blocking capacitors,
noise blocking filters, etc.
3, Use specified internal wiring. Note especially:
1) Wires covered Wllh PVC tubing
2} Double insulated wires
3) High voltage leads
A Use specified insulating materials for hazardous live
t) Insulation Tape
2) PVC tubing
3) Spacers (insulating barriers)
4) Insulation sheets for transistors
5) Plastic screws for ļ¬xing micro switches
5. When replactng AC primary side components
(transformers, power cords, noise blocking capacitors,
etc). wrap the ends of the wires securely around the
terminals before soldering.
6. Make sure that wires do not contact heat producing
parts (heat sinks, oxide metal Iilm resistors. lusihle
7t Check that replaced wires do not contact sharp edged
or pointed parts.
. Also check areas surrounding repaired locations.
9- Make sure that foreign objects (screws, solderdroplets,
etc) do not remain inside the set.
SAFETY CHECK AFTER SERVICING
Alter servicing, make measurements of leakage-current
or resistance in order to determine that exposed parts
are acceptably insulated Item the supply circuit.
The leakage-current measurement should be done be-
tween accessible metal parts (such as chassis, ground
terminal, microphone iacks, signal tnpUI/omput connectors,
etc.) and the earth ground through a resistor of 1500
ohms paralleled with a 0.15 uF capacitor, under the unit's
normal working conditions. The leakage-current should
be less than 0.5 mA rms AC.
The resistance measurement should be done between
accessible exposed metal parts and power cord plug
prongs with the power switch (it included) -ON". The
resistance should be more than 2.2 M ohmsr
SYMBOLS FOR PRIMARY DESTINATION
Unit destinations are indicated with letters as shown below,
Symbols Principal Destinations
-E9 Europe (except U.K)