Safety Precaution for Repair > Notes When Using Service Manual

1-5 Notes When Using Service Manual

(1) Value units used in parts list

Certain symbols are indicated as shown below for value units of resistors, capacitors and coils in parts list. When you read them, note the following regular indications:

Parts

Indication in list

Regular indication

 

 

 

Resistor

KOHM

k

Capacitor

UF

µF

 

PF ................................................ pF

Coil

UH

µH

 

MH

mH

(2) 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. Certain symbols are indicated for value units: When you read them note the regular indications in tables below:

[Resistors]

Item

 

Indication

 

 

 

Value

No indication

..............................

 

K .................................................. k

 

M

M

Tolerance

No indication

.............................. ±5%

 

(All tolerances other than ±5% are

 

indicated in schematic diagrams)

Power

No indication

.............................. 1/8W

capacitance

(1/16 W for leadless resistors with no

 

indication)

 

 

All capacitances other than the above

 

are indicated in schematic diagrams.

[Capacitors]

Item

Indication

 

 

 

 

Value

No indication

µF

 

P .................................................. pF

Dielectric

No indication

50V

strength

(All dielectric strengths other than

 

50 V are indicated in schematic

 

 

diagrams)

 

[Coils]

 

 

 

 

 

Item

Indication

 

 

 

 

Value

µ

µH

 

m

mH

(3)Identifications of sides A/B in circuit board diagrams

1)Board with 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 with 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.

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Hitachi service manual Value units used in parts list, Values in schematic diagrams

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