Hitachi VM-E230E - Page 49

CHAPTER 6 SCHEMATIC AND CIRCUIT BOARD DIAGRAMS
Cautions when using schematic diagrams
Caution for safety
The parts marked /\ 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.
Resistors
Item Indication
Value No indication «+> cvrreceereeee veeeee oe QO
We ete tiaocae arses sarees ee kQ
TW canes sta itantenaeeesint exten MQ
Tolerance No indication ..... ..ssccsceeseeeeeeees tt 5%
(All tolerances other than + 5% are
indicated in the schematic diagrams)
Power No indiCation .........cccsscsscseseeeees V8W
capacitance (1/16W for leadless resistors without
indication) All capacitances other
than the above are indicated in the
schematic diagrams.
indication
Value «—s | Noo indication ............ssceceseseeeees uF
No indication ...........cccsceee cones
(All dielectric strengths other than
50V are indicated in the schematic
diagrams.)
Dielectric
strength
Coils
ltem indication
Value Pb: ihedadenctins ingen eerste wH
TY e sese ci aeaecate veces tandesssveutwiesstweades mH
2. Markings in schematic diagrams
1) Parts marked "i" with circuit numbers in the
schematic diagrams are discrete parts.
2) Parts marked " @" with circuit numbers in the
schematic diagrams are leadless parts.
Cautions when using circuit board diagrams
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
No. Location
Circuit No.
Sort of parts
Zone "A" on board diagram
Zone "2" on board diagram
2) In case of side A/B indication board
Symbol | Part
No. Location
Circuit No.
Sort of parts
Zone "A" on board diagram
Zone "2" on board diagram
A: Shows side A
B: Shows side B