Notes When Using Service Manual - Hitachi VK-S454R Service Manual

Safety Precaution for Repair > Lead-Free Solder / Notes When Using Service Manual
(5) Cautions when using lead based solder
It is recommended that you use lead-free solder when servicing, but it is also possible to service
using lead based solder. However, if lead based solder is used for servicing, take care with the
following:
1) Before using lead based solder, remove the lead-free solder completely from the point to be
soldered.
2) For additional soldering for repair, set the soldering iron tip temperature for lead-free solder, mix
lead based solder and lead-free solder sufficiently. Do not perform any repair using the bare
soldering iron tip without adding solder, since it will cause secondary failure due to lack of
strength.

1-4 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
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.
Certain symbols are indicated for value units: When you read them note the regular indications in
tables below:
[Resistors]
Item
No indication ..............................
Value
K .................................................. k
M ................................................. M
No indication .............................. ±5%
Tolerance
(All tolerances other than ±5% are
indicated in schematic diagrams)
No indication .............................. 1/8W
Power
capacitance (1/16 W for leadless resistors with no
indication)
All capacitances other than the above
are indicated in schematic diagrams.
Regular indication
Indication
1 - 3
[Capacitors]
Item
No indication .............................. µF
Value
P .................................................. pF
No indication .............................. 50V
Dielectric
strength (All dielectric strengths other than
50 V are indicated in schematic
diagrams)
[Coils]
Item
µ ................................................... µH
Value
m .................................................. mH
Indication
Indication