Sharp DX-AT50H (serv.man12) Service Manual ▷ View online
DX-AT50H
– 34 –
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 replacement components
rated for higher voltage, wattage, etc. Replacement parts that
have these special safety characteristics are identified in this
manual and its supplements; electrical components having
such features are identified by the mark "
special characteristics. These characteristics often pass
unnoticed and the protection afforded by them cannot
necessarily be obtained by using replacement components
rated for higher voltage, wattage, etc. Replacement parts that
have these special safety characteristics are identified in this
manual and its supplements; electrical components having
such features are identified by the mark "
1
" in the schematic
diagram and the parts list. Before replacing any of these
components, 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.
components, 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)
(F)
±
10%
+30 - 80%
±
15%
+30 - 80%
20
°
C
20
°
C
20
°
C
20
°
C
-25~+85
°
C
-25~+85
°
C
-25~+85
°
C
-10~+70
°
C
(SR)
(Z)
Capacitors and transistors are represented by the following
symbols.
symbols.
(Top View) (Bottom View)
(Bottom View)
Electrolytic Capacitor
+
Transistor or Digital Transistor
NPN Transistor
PNP Transistor
NPN Digital Transistor
PNP Digital
Transistor
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
SCHEMATIC DIAGRAMS / CBA’S AND TEST POINTS
Notes:
1. Do not use the part number shown on these drawings for
1. Do not use the part number shown on these drawings for
ordering. The correct part number is shown in the parts list,
and may be slightly different or amended since these
drawings were prepared.
and may be slightly different or amended since these
drawings were prepared.
2. All resistance values are indicated in ohms (K=10
3
, M=10
6
).
3. Resistor wattages are 1/4W or 1/6W unless otherwise specified.
4. All capacitance values are indicated in mF (P=10
4. All capacitance values are indicated in mF (P=10
-6
mF).
5. All voltages are DC voltages unless otherwise specified.
6. Electrical parts such as capacitors, connectors, diodes,
6. Electrical parts such as capacitors, connectors, diodes,
IC's, transistors, resistors, switches, and fuses are identified
by four digits. The first two digits are not shown for each
component. In each block of the diagram, there is a note
such as shown below to indicate these abbreviated two
digits.
by four digits. The first two digits are not shown for each
component. In each block of the diagram, there is a note
such as shown below to indicate these abbreviated two
digits.
– 35 –
DX-AT50H
LIST OF CAUTION, NOTES, AND SYMBOLS USED IN THE SCHEMATIC DIAGRAMS ON THE
FOLLOWING PAGES:
FOLLOWING PAGES:
1. CAUTION:
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH THE SAME TYPE FUSE.
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH THE SAME TYPE FUSE.
2. CAUTION:
Fixed Voltage (or Auto voltage selectable) power supply circuit is used in this unit.
If Main Fuse (F1001) is blown, first check to see that all components in the power supply circuit are not defective before you connect
the AC plug to the AC power supply. Otherwise it may cause some components in the power supply circuit to fail.
Fixed Voltage (or Auto voltage selectable) power supply circuit is used in this unit.
If Main Fuse (F1001) is blown, first check to see that all components in the power supply circuit are not defective before you connect
the AC plug to the AC power supply. Otherwise it may cause some components in the power supply circuit to fail.
3. Note:
a. Do not use the part number shown on the drawings for ordering. The correct part number is shown in the parts list, and may
a. Do not use the part number shown on the drawings for ordering. The correct part number is shown in the parts list, and may
be slightly different or amended since the drawings were prepared.
b. To maintain original function and reliability of repaired units, use only original replacement parts which are listed with their part
numbers in the parts list section of the service manual.
4. Wire Connectors
a. Prefix symbol “CN” means “connector” (can disconnect and reconnect).
b. Prefix symbol “CL” means “wire-solder holes of the PCB” (wire is soldered directly).
a. Prefix symbol “CN” means “connector” (can disconnect and reconnect).
b. Prefix symbol “CL” means “wire-solder holes of the PCB” (wire is soldered directly).
5. Voltage indications for PLAY mode on the schematics are as shown below:
2
3
1
5.0
PLAY mode
5.0
Unit: Volts
Indicates that the voltage
is not consistent here.
is not consistent here.
6. How to read converged lines
1-D3
Distinction
Area
Line
Number
(1 to 3 digits)
Examples:
1. "1-D3" means that line number "1" goes to area "D3".
2. "1-B1" means that line number "1" goes to area "B1".
2. "1-B1" means that line number "1" goes to area "B1".
3
2
1
A
B
C
D
1-B1
1-D3
AREA D3
AREA B1
7. Test Point Information
: Indicates a test point with a jumper wire across a hole in the PCB.
: Used to indicate a test point with a component lead on foil side.
: Used to indicate a test point with no test pin.
: Used to indicate a test point with a test pin.
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