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CHAPTER
6
SCHEMATIC, CIRCUIT BOARD AND BLOCK DIAGRAMS/
MICROPROCESSOR PIN FUNCTION TABLES
Cautions when using schematic diagrams
]
[Cautions when using circuit board diagrams
Caution for safety
The parts marked A are critical for safety. Be sure to
use the specified parts to ensure safety when replacing
them.
1. Values in schematic diagrams
The values, dielectric strength (power capacitance) and
tolerances of the resistors (excluding variable resistors)
and capacitors are indicated in the schematic diagrams
using abbreviations.
Ri
tors)
item
Indication
Value
No indication .
K...
Mo.
Tolerance
No indication -
+5%
(All tolerances other than = 5% are
Indicated in the schematic diagrams)
Power
No indication
oe BW
capacitance
(1/46W for leadiess resistors without
indication)
All capacitances other than the above
are indicated in the schematic
diagrams.
[Capacitors]
item
Indication
Value
No indication .
pF
Pos.
pF
Dielectric
No indication .
50V
strength
(All dielectric strengths other than 50V
are indicated in the schematic
diagrams.)
[Coils]
Item
Indication
Value
1. Identifications of sides A/B in circuit board diagrams
1) Board having a pattern on one side and parts on
both sides,
Side A:
Shows discrete parts, viewed from the
pattern side,
Side B:
Shows leadless parts, viewed from the
pattern side.
2) Board having patterns on both sides and parts on
both sides,
Side A:
Shows parts and patterns which can be
seen when the case is opened,
Side B:
Shows parts and the pattern on the back of
side A.
2. Table for indexing locations of parts
This table shows locations of each part on the circuit
board diagrams.
The locations are indicated using the
guide scales on the external lines of diagrams.
1) In case of one-layer board
[Symbol | Part
No.
Location
| ¢ —————_/———-.
Sort of parts
102101
2
A
in board diagram
Circuit No.
Zone
"2" on board diagram
2) In case of side A/B indication board
Symbo!|
Part
No.
Location
Q
Sort of parts
Q1201
A-ZA
Zone "A" on board diagram
Circuit No.
Zone
"2" on board diagram
A: Shows side A
B: Shows side B
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