Toshiba V-854G Serviceanleitung Seite 54

5-2. Precautions for Part Replacement
« Inthe schematic diagram, parts marked & (ex. &
F801) are critical part to meet the safety regulations,
so always use the parts bearing specified part codes
(SN) when replacing them.
« Using the parts other than those specified shal} violate
the regulations, and may cause troubles such as
operation failures, fire etc.
5-3. Solid Resistor Indication
Rated Wattage
Type NOC ceseneeeee
i Ss F Soli
voceeew Metal fil
.. Fusible
described in the Circuit Diagram.
Rated Wattage Type Tolerance
.. Electrolytic, Spiel electrolytic
Non polarity electrolytic
Ceramic, plastic
BAR
Temperature Rated Tolerance
response voltage
For other than 50V and electrolytic capacitors,
Rated voltage
(1) Ceramic, plastic, and film ape of which
10.1%
D
F
G
capacitance are 10 pF or less.
(3) Electrolytic, Trimmer
(Ceramic capacitor) For others, temperature characteristics are
Tolerance
capacitance are more than 10 pF.
Bs !
Cc
..more than +5% pF
B
Tolerance ts not described.
described. (For capacitors of 0.01 yF and
None ..£5% or more
(2) Ceramic, plastic, and film capacitors of which
None
10.1 pF
Cc
Temperature characteristic None re
no indications are described as F.)
5-5. Inductor Indication
Type Tolerance
Peaking
For other, model name is described.
5-6. Waveform and Voltage Measurement
¢ Measurement of waveform and voltage at each section
in the color circuits was conducted with sufficient
service color bar signal being received and reproduced
in normal conditions.
= If it is difficult to remove the part, temporarily stop the
desoldering job and wait until temperature of the part
lowers.
Then, repeat steps 1 and 2.
. Waveforms and voltage values for the remaining . 4
circuit were measured with a broadcasting signal
normally received, so they may vary slightly accord-
ing to the programs being received. Use them as a
measure for servicing.
. Form leads of the replacement part (general part
equivalent to the chip part) as shown in the figures and
solder place. (Fig. 10)
zi =F
—2 ee d 5 3~4mm
x °
5mm + i
3~4mm
All voltage values except the waveforms are expressed
in DC and measured by a digital voltmeter.
5-7. Chip Part Replacement
(Use spare part with wire leads connected.)
Fig. 10
5. Mount the replacement part so that it does not touch
1. Hold a Chip part to be removed with tweezers and any other parts. (Fig. 11)
apply heat to the solder at one end of the part with a
soldering iron. (Fig. 9)
pias i'
Baasss
C25)
C25)
; 8
[a
Fig. 9
Fig. 11
2. Apply heat to the solder at the other end of the part
and remove it.
The heating time should be as short as possible so the
excessive heat is not applied to foil patterns and the
PC Board.
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