3-1
SECTION 3
DIAGRAMS AND CIRCUIT BOARDS
SCHEMATIC DIAGRAM NOTES
• Schematic safety precaution
!
Parts are safety related parts.
When replacing them, be sure to use the specified parts.
• Voltage and waveform measurements
Voltage:
Measured with digital voltmeter in DC range;
lens closed.
Waveform: Gray scale illuminated at more than 4000 lux at
3200K lighting.
• Unit of value
Unless otherwise specified
1)
Resistance is in
Ω
(1/6 W)
2)
Capacitance is in
µ
F
3)
Inductance is in
µ
H
REPLACING SURFACE MOUNT “CHIP” COMPONENTS
• Some resistors, shorting jumpers (0
Ω
resistance), ceramic
capacitors, transistors, and diodes are chip parts. These chip
parts cannot be reused after they are once removed.
• Chip resistors used in some circuits are of high precision
type having little error in resistance.
To demonstrate the full capacity of this set, place an order
for proper parts referring to the diagrams and parts lists in
the section 5.
• Soldering cautions:
1) Do not apply heat for more than 3 seconds.
2) Avoid using a rubbing stroke when soldering.
3) Discard removed chips; do not reuse them.
4) Supplementary cementing is not required.
5) Use care not to scratch or otherwise damage the chips.
[3] Chip diodes
CHIP PARTS PIN ARRANGEMENT
[1] Digital transistors
R1
R2
C
B
E
R1
R2
C
B
E
DTC 1
1
2 3
DTB 1
DTA 1
1
2 3
(Top view)
(Top view)
1
Two digits show resistance of R1 in abbreviation.
43 : 4.7 k
Ω
14 : 10 k
Ω
24 : 22 k
Ω
44 : 47 k
Ω
2
Roman letter show the resistive ratio between R1 and R2
in abbreviation.
E
: R2/R1 = 1/1
Y
: R2/R1 = 5/1
W : R2/R1 = 2/1
X
: R2/R1 = 1/2
T
: R2 is opened.
3
Symbol the shape of resistor in abbreviation.
[2] Chip transistors and chip F.E.T.s
(Top view)
(Top view)
(Top view)
(Top view)
MA143A/MA742
MA142WA
MA142A
(Top view)
(Top view)
(Top view)
C
B
E
G
S
D
C
B
E
2SD
2SC
2SB
2SJ
2SK
2SA
G
S
D
Summary of Contents for TK-C553E
Page 30: ......
