Panasonic RF-B20L - Circuit Board and Wiring Connection Diagram; Replacing Chip Parts (Removal)

TELESCOPIC
ANTENNA
ECB
Q17, 18
CIRCUIT
BOARD
AND
WIRING
CONNECTION
DIAGRAM
2 3
4
5
MAIN CIRCUIT BOARD
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BATTERY 45v
(UM- 3x3)
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@ Replacing Chip Parts
(Removal)
Ca
Cathode Cathode Anode Cathode
Anode
ya
Ser
Anode
Anode
Al
Anode
node
HY
cathodel
Cathode
aoe Cathode
D1 D2, 9, 10, 11 Ds
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Hold the chips with tweezers as shown in Fig. 1, and
alternately touch the soldering iron (for less than
three seconds) to the soldered part on either side of
the chip. Gradually lift the chip up and remove it.
Caution: Removing the chips all at once will break the
plating on the circuit board.
(Attachment)
Carefully
solder
the
replacement
parts
to
the
same
location (do not permit the parts to shift).
Note: If allowed to shift, the part may interfere with
the mechanism.
*Use only one millimeter at the end of the
soldering iron
9
ry 3 [[SPEAKER
+ —~S5em 82
Soldering iron
G20 Q2! 23
This printed circuit board is shown from the back side of
chip parts.
Notes:
1. The circuit shown in (
indicates printed circuit
printed circuit board.
2. The circuit shown in ( (me) on the conductor
indicates printed circuit on the front side of the
printed circuit board.
3. The symbols (@) shown in the circuit board indicate
connection points between conductors on the front
side and back side of the circuit board.
)) on the conductor
he back side of the
eThis circuit board diagram may be modified at
any time with the development of new tech-
nology.
General - Dede
Be ||
Cathode
Anode Cathode
ie)
pe