Safety Instructions, Warnings, and Notes
EN 5
TES1.0E LA
2.
2.
Safety Instructions, Warnings, and Notes
Index of this chapter:
2.1 Safety Instructions
2.2 Warnings
2.3 Notes
2.1
Safety Instructions
Safety regulations require the following during a repair:
•
Connect the set to the Mains/AC Power via an isolation
transformer (> 800 VA).
•
Replace safety components, indicated by the symbol
h
,
only by components identical to the original ones. Any
other component substitution (other than original type) may
increase risk of fire or electrical shock hazard.
Safety regulations require that after a repair, the set must be
returned in its original condition. Pay in particular attention to
the following points:
•
Route the wire trees correctly and fix them with the
mounted cable clamps.
•
Check the insulation of the Mains/AC Power lead for
external damage.
•
Check the strain relief of the Mains/AC Power cord for
proper function.
•
Check the electrical DC resistance between the Mains/AC
Power plug and the secondary side (only for sets that have
a Mains/AC Power isolated power supply):
1.
Unplug the Mains/AC Power cord and connect a wire
between the two pins of the Mains/AC Power plug.
2.
Set the Mains/AC Power switch to the "ON" position
(keep the Mains/AC Power cord unplugged!).
3.
Measure the resistance value between the pins of the
Mains/AC Power plug and the metal shielding of the
tuner or the aerial connection on the set. The reading
should be between 4.5 Mohm and 12 Mohm.
4.
Switch "OFF" the set, and remove the wire between the
two pins of the Mains/AC Power plug.
•
Check the cabinet for defects, to prevent touching of any
inner parts by the customer.
2.2
Warnings
•
All ICs and many other semiconductors are susceptible to
electrostatic discharges (ESD
w
). Careless handling
during repair can reduce life drastically. Make sure that,
during repair, you are connected with the same potential as
the mass of the set by a wristband with resistance. Keep
components and tools also at this same potential. Available
ESD protection equipment:
–
Complete kit ESD3 (small tablemat, wristband,
connection box, extension cable and earth cable) 4822
310 10671.
–
Wristband tester 4822 344 13999.
•
Be careful during measurements in the high voltage
section.
•
Never replace modules or other components while the unit
is switched "ON".
•
When you align the set, use plastic rather than metal tools.
This will prevent any short circuits and the danger of a
circuit becoming unstable.
2.3
Notes
2.3.1
General
•
Measure the voltages and waveforms with regard to the
chassis (= tuner) ground (
H
), or hot ground (
I
), depending
on the tested area of circuitry. The voltages and waveforms
shown in the diagrams are indicative. Measure them in the
Service Default Mode (see chapter 5) with a colour bar
signal and stereo sound (L: 3 kHz, R: 1 kHz unless stated
otherwise) and picture carrier at 475.25 MHz for PAL, or
61.25 MHz for NTSC (channel 3).
•
Where necessary, measure the waveforms and voltages
with (
D
) and without (
E
) aerial signal. Measure the
voltages in the power supply section both in normal
operation (
G
) and in stand-by (
F
). These values are
indicated by means of the appropriate symbols.
•
The semiconductors indicated in the circuit diagram and in
the parts lists, are interchangeable per position with the
semiconductors in the unit, irrespective of the type
indication on these semiconductors.
•
Manufactured under license from Dolby Laboratories.
“Dolby”, “Pro Logic” and the “double-D symbol”, are
trademarks of Dolby Laboratories.
2.3.2
Schematic Notes
•
All resistor values are in ohms, and the value multiplier is
often used to indicate the decimal point location (e.g. 2K2
indicates 2.2 kohm).
•
Resistor values with no multiplier may be indicated with
either an "E" or an "R" (e.g. 220E or 220R indicates 220
ohm).
•
All capacitor values are given in micro-farads (
μ=
x10
-6
),
nano-farads (n= x10
-9
), or pico-farads (p= x10
-12
).
•
Capacitor values may also use the value multiplier as the
decimal point indication (e.g. 2p2 indicates 2.2 pF).
•
An "asterisk" (*) indicates component usage varies. Refer
to the diversity tables for the correct values.
•
The correct component values are listed in the Spare Parts
List. Therefore, always check this list when there is any
doubt.
2.3.3
Lead-free Solder
Philips CE is producing lead-free sets (PBF) from 1.1.2005
onwards.
Identification: The bottom line of a type plate gives a 14-digit
serial number. Digits 5 and 6 refer to the production year, digits
7 and 8 refer to production week (in example below it is 2006
week 17).
Figure 2-1 Serial number example
Regardless of the special lead-free logo (which is not always
indicated), one must treat all sets from this date onwards
according to the rules as described below.
Figure 2-2 Lead-free logo
Due to lead-free technology some rules have to be respected
by the workshop during a repair:
E_06532_024.eps
130606
MODEL :
PROD.NO:
~
S
32PF9968/10
MADE IN BELGIUM
220-240V
50/60Hz
128W
AG 1A0617 000001
VHF+S+H+UHF
BJ3.0E
LA
P
b
