Philips DVP3236/94, Service Manual

Page: 4 / 55

IMPORTANT SAFETY PRECAUTIONS
Product Safety Notice
Some electrical and mechanical parts have
special safety-related characteristics which
are often not evident from visual inspection,
nor can the protection they give necessarily be
obtained by replacing them with components
rated for higher voltage, wattage, etc. Parts
that have special safety characteristics are
identified by a
#
on schematics and in parts
lists. Use of a substitute replacement that
does not have the same safety characteristics
as the recommended replacement part might
create shock, fire, and/or other hazards. The
Product’s Safety is under review continuously
and new instructions are issued whenever
appropriate. Prior to shipment from the factory,
our products are carefully inspected to confirm
with the recognized product safety and
electrical codes of the countries in which they
are to be sold. However, in order to maintain
such compliance, it is equally important to
implement the following precautions when a
set is being serviced.
Precautions during Servicing
A. Parts identified by the
#
symbol are critical
for safety. Replace only with part number
specified.
B.
In addition to safety, other parts and
assemblies are specified for conformance with
regulations applying to spurious radiation.
These must also be replaced only with
specified replacements. Examples: RF
converters, RF cables, noise blocking
capacitors, and noise blocking filters, etc.
C.
Use specified internal wiring. Note
especially:
1) Wires covered with PVC tubing
2) Double insulated wires
3) High voltage leads
D.
Use specified insulating materials for
hazardous live parts. Note especially:
1) PVC tubing
2) Spacers
3) Insulators for transistors
E. When replacing AC primary side
components (transformers, power cord, etc.),
wrap ends of wires securely about the
terminals before soldering.
F.
Observe that the wires do not contact heat
producing parts (heat sinks, oxide metal film
resistors, fusible resistors, etc.).
G. Check that replaced wires do not contact
sharp edges or pointed parts.
H.
When a power cord has been replaced,
check that5 - 6 kg of force in any direction will
not loosen it.
I.
Also check areas surrounding repaired
locations.
J.
Be careful that foreign objects (screws,
solder droplets, etc.) do not remain inside the
set.
K.
Crimp type wire connector
The power transformer uses crimp type
connectors which connect the power cord and
the primary side of the transformer. When
replacing the transformer, follow these steps
carefully and precisely to prevent shock
hazards.
Replacement procedure
1) Remove the old connector by cutting the
wires at a point close to the connector.
Important: Do not re-use a connector.
(Discard it.)
2) Strip about 15 mm of the insulation from the
ends of the wires. If the wires are stranded,
twist the strands to avoid frayed conductors.
3) Align the lengths of the wires to be
connected. Insert the wires fully into the
connector.
4) Use a crimping tool to crimp the metal
sleeve at its center. Be sure to crimp fully to
the complete closure of the tool.
L.
When connecting or disconnecting the
internal connectors, first, disconnect the AC
plug from the AC outlet.
Page 2 of 51