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Circuit Board Diagrams - Hitachi VK-S454 Service Manual

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Notes When Using Service Manual
The following shows the contents to be noted when using service manual:
1. Value units used in parts list
Certain symbols are indicated 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
KOHM ........................................... k
Resistor
UF ................................................ µF
Capacitor
PF ................................................ pF
UH ................................................ µH
Coil
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.
[Resistors]
Item
No indication ...................................
K ................................................... k
Value
M .................................................. M
No indication ............................. ±5%
Tolerance
(All tolerances other than ±5% are
indicated in schematic diagrams)
No indication ............................ 1/8W
(1/16W for leadless resistors without
Power
indication)
capacitance
All capacitances other than the above
are indicated in schematic diagrams.
[Capacitors]
Item
No indication ................................. µF
Value
P ................................................... pF
No indication .............................. 50V
Dielectric
(All dielectric strengths other than 50V
strength
are indicated in schematic diagrams)
[Coils]
Item
µ .................................................... µH
Value
m .................................................. mH
Regular indication
Indication
Indication
Indication
3. 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.
4. Table for indexing locations of parts
This table shows locations of each part on circuit board
diagrams. The locations are indicated using the guide
scales on the external lines of diagrams.
1) One diagram indicated for each board
Symbol
Parts
No.
Location
IC
IC1201
2
Circuit No.
2) Two diagrams indicated for each board
Symbol
Parts
No.
Location
IC
IC1201
A - 2
Circuit No.
A: Shows side A
B: Shows side B
Type of part
A
Zone "A" on board diagram
Zone "2" on board diagram
Type of
part
A
Zone "A" on board
diagram
Zone "2" on board
diagram
CAUTION-2

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