E.F. Johnson Company Summit DM 975x, Service Manual

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SERVICING
7-6
Revised January 1995
Part No. 001-9750-003
as follows. For example, “273” indicates a 27k ohm
resistor and “339” indicates a 3.3 ohm resistor.
± 1% Resistors (P.N. 569-0111-xxx)
Some resistors with a
±
1% tolerance are identi-
fied by a four-digit number and others may not have a
marking. When identified with a four-digit number,
the first three digits are the value and the fourth is the
multiplier. For example, “5761” indicates a 5.76k ohm
resistor.
7.6.3 SMD CAPACITOR IDENTIFICATION
Ceramic SMD Capacitors (P.N. 510-36xx-xxx)
Ceramic SMD capacitors are identified using
either an American or Japanese EIA standard. The
American standard uses a single letter or number to
indicate the value, and the color of this letter or
number to indicate the multiplier. The Japanese stan-
dard uses a letter to indicate the value followed by a
number to indicate the multiplier. The values for both
standards are shown in the following table. For
example, if there is a single black “E” on the capacitor,
it uses the American standard and its value is 15 pF.
The same value is identified with the Japanese stan-
dard by “E1”.
The Japanese standard may also utilize a bar to
indicate the temperature coefficient. The following
coefficients are indicated by this bar. For example,
“A2” indicates a 100 pF NPO capacitor.
XX = NPO XX = N150 XX = N220
XX = N330 XX = N470 XX = N750
|XX = X7R
Tantalum SMD Capacitors (P.N. 510-26xx-xxx)
Tantalum SMD capacitor identification varies
with vendor and physical size of the capacitor. The
positive (+) end is usually indicated by a colored band
or beveled edge. The value and voltage may be indi-
cated by printing on the capacitor or by using a special
code.
0 = 0
1 = 10
2 = 100
3 = 1000
4 = 10,000
5 = 100,000
6 = 1,000,000
7 = 10,000,000
8 = .01
9 = .1
Multiplier
Value in ohms
X X X
Table 7-1 Ceramic SMD Capacitor Identification
American EIA Standard Japanese EIA Standard
First Letter/
Number
Value
(pF)
First Letter/
Number
Value
(pF)
A 10 A 1.0
B 11 B 1.1
C 12 C 1.2
D 13 D 1.3
E 15 E 1.5
H 16 F 1.6
I 18 G 1.8
J 20 H 2.0
K 22 J 2.2
L 24 K 2.4
N 27 L 2.7
O 30 M 3.0
R 33 N 3.3
S 36 P 3.6
T 39 Q 3.9
V 43 R 4.3
W 47 S 4.7
X 51 T 5.1
Y 56 U 5.6
Z 62 V 6.2
3 68 W 6.8
4 75 X 7.5
7 82 Y 8.2
9 91 Z 9.1
Color
Multi-
plier
Second
Number
Multi-
plier
Orange 0.1 0 1
Black 1 1 10
Green 10 2 100
Blue 100 3 1000
Violet 1000 4 10,000
Red 10,000 5 100,000