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1
Safety Precaution for Repair
1-1 Cautions
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts have special safety-related characteristics. These are often not
evident from visual inspection nor can the protection afforded by them necessarily be obtained by using
replacement components rated for a higher voltage, wattage, etc. Replacement parts which have these
special safety characteristics are identified in this Service Manual. Electrical components having such
features are identified by marking with a
The use of a substitute replacement component which does not have the same safety characteristics as
the HITACHI recommended replacement one, shown in the parts list in this Service Manual, may create
shock, fire, or other hazards. Product safety is continuously under review and new instructions are issued
from time to time. For the latest information, always consult the current HITACHI Service Manual. A
subscription to, or additional copies for, HITACHI Service Manual may be obtained at a nominal charge
from HITACHI SALES CORPORATION.
1-2 Notes When Using Service Manual
The following shows the contents to be noted when using service manual:
1-2-1 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
1-2-2 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.
on the schematics and the parts list in this Service Manual.
Regular indication
Indication
1 - 1
[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
Indication
Indication
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