Hitachi DV-W1U - Manual (Page 3)

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