Panasonic PV-20DF25-K, Service Manual

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8 SCHEMATIC DIAGRAMS
8.1. SCHEMATIC DIAGRAM AND CIRCUIT BOARD LAYOUT NOTES
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 a component lead on the foil side.
:Test point with no test pin.
:Test point with a test pin.
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.
POWER SUPPLY
C.B.A.
MAIN C.B.A.
The Number of pins of the Connector.
Connector No.
on Main C.B.A.
P1503 P3004
(10 Pins)
Ref. No. of the connection parts such as lead cable,
flexible cable which is supplied as a replacement parts.
244
3. Parts marked "PT" are not used in any models included
in this service model.
Example:
100P
PT
C6011
R6097
PT
PT
C6011
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
Voltage Chart Note
Voltage Measurement
a. Color bar signal in SP mode.
b. ---:Unmeasurable or not necessary to measure.
Circuit Board Layout Note
Circuit Board Layout shows components installed for
various models.
For proper parts content for the model you are servicing,
please refer to the schematic diagram and parts list.
NOTE:
Circuit Board Layout includes components which are not
used.
9
1 2 3 4 5 6 7
WF1
8
+250mVp-p V1
CH1 TP3002
0.1V 5ms 2
REC SP/LP/SLP
CH2 TP6205
5V
1 Connecting Point
2 Volts/Div
3 Volts/Div
4 Connecting Point
5 Time/Div
6 Trigger Channel of
the scope
(1:CH1,2:CH2)
7
Operation Mode of
VCR
8 Waveform Point on
Schematic
9 V1:Peak to Peak
Note : Refer to item 3 of Schematic Diagram Notes for mark "PT".
Model No. Identification Mark
SCHEMATIC DIAGRAM & CIRCUIT BOAD LAYOUT NOTES
PV-20DF25/PV-20DF25-K/PV-27DF25/PV-27DF25-K/PV-27DF5
PV-20DF25
PV-20DF25-K
PV-27DF25
PV-27DF25-K
PV-27DF5
Not Used
A
B
C
D
E
PT
MODEL
MARK
PV-20DF25 / PV-27DF25 / PV-27DF5 / PV-20DF25-K / PV-27DF25- K
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