Hitachi VT-FX685A, Service Manual, Page: 21 / 67

SCHEMATIC DIAGRAMS / CBA’S AND TEST POINTS
Standard Notes
Warning
Many electrical and mechanical parts in this chassis
have special characteristics. These characteristics
often pass unnoticed and the protection afforded by
them cannot necessarily be obtained by using replace-
ment components rated for higher voltage, wattage, etc.
Replacement parts that have these special safety char-
acteristics are identified in this manual and its supple-
ments; electrical components having such features are
identified by the mark "
#
" in the schematic diagram
and the parts list. Before replacing any of these compo-
nents, read the parts list in this manual carefully. The
use of substitute replacement parts that do not have the
same safety characteristics as specified in the parts list
may create shock, fire, or other hazards.
Capacitor Temperature Markings
Mark
Capacity
change rate
Standard
temperature
Temperature
range
(B)
±
10% 20°C -25~+85°C
(F) +30 -80% 20°C -25~+85°C
(SR)
±
15% 20°C -25~+85°C
(Z) +30 -80% 20°C -10~+70°C
Capacitors and transistors are represented by the fol-
lowing symbols.
Note:
1. Do not use the part number shown on these draw-
ings for ordering. The correct part number is shown
in the parts list, and may be slightly different or
amended since these drawings were prepared.
2. All voltages are DC voltages unless otherwise speci-
fied.
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 Indication
Value
No indication...........................
Ω
K............................................k
Ω
M..........................................M
Ω
Power
capacitance
No indication............1/4W,1/6W
All capacitances other than the
above are indicated in schematic
diagrams.
[ Capacitors ]
Item Indication
Value
No indication...........................
µ
F
P..............................................pF
Dielectric
strength
No indication...........................50V
All dielectric strengths other than
50V are indicated in schematic
diagrams.
[ Coils ]
Item Indication
Value
µ
...............................................
µ
H
m.............................................mH
(Top View) (Bottom View)
(Bottom View)
Electrolytic Capacitor
+
Transistor or Digital Transistor
NPN
Transistor PNP
Transistor
NPN Digital
Transistor PNP Digital
Transistor
(Top View)
(Top View)
E C B
E C B
Digital Transistor
CBA Symbols
Schematic Diagram Symbols
E C B
(Top View)
(Top View)
E C B
E C B
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