Panasonic DoubleFeature PV-D4734S, Service Manual

Page: 138 / 170

1. Important safety notice
Components identified by the sign have special
characteristics important for safety. When replacing any
of these components. Use only the specified parts.
2. Do not use the part number shown on this drawing for
ordering.
The correct part number and part value is shown in the
parts list, and may be slightly different or amended since
this drawing was prepared.
3. Use only original replacement parts:
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. Parts different in shape or size may be used.
However, only interchangeable parts will be supplied as
service replacement parts.
5. Test point information
: Test point with a jumper wire across a hole in P.C.B.
: Test point with no test pin.
:Test point with a component lead on the foil side.
Schematic Diagram Notes
1. Indication for Zener Voltage of Zener Diodes
The Zener Voltage of Zener Diodes are indicated as such
on Schematic Diagrams.
Example:
(6.2V)......Zener Voltage
2. How to identify Connectors
Each connector is labeled with a Connector No. and Pin
No. Indicating what it is connected to,
in other words, its counter part.
Use the interconnection schematic diagram to find the
connection between associated connectors.
Example:
The connections between C.B.A.s are shown below.
3. Parts marked "PT" are not used in any models included
in this service model.
4. Jumper wires are used for WA10, WA5 etc and these are
not supplied as replacement parts.
Signal Waveform Note
How to read Signal Waveform
Circuit Board Layout Note
Circuit Board Layout shows components installed for
various models.
For proper parts content for the model you are servicing,
Voltage Chart Note
Voltage Measurement
a. Color bar signal in SP mode.
b, ---: Unmeasurable or not necessary to measure.
please refer to the schematic diagram and parts list.
NOTE:
Circuit Board Layout includes components which are not
used.
Model No. Identification Mark
Note : Refer to item 3 of Schematic Diagram Notes for mark "PT".
SCHEMATIC DIAGRAM AND CIRCUIT BOARD LAYOUT NOTES
PV-D4734S/PV-D4744/PV-D4744S/PV-D4754S/PV-D4734S-K/PV-D4744S-K/PV-D4754S-K
0.5 V 20 µs
V1 1.0 Vp-p
Volts/Div
Time/Div
V1:Peak to Peak
1
2
3
1 2
3
PV-D4734S
PV-D4744
PV-D4744S
PV-D4754S
PV-D4734S-K
PV-D4744S-K A
B
C
D
E
F
PV-D4754S-K
Not Used G
PT
MODEL MARK