Panasonic Omnivision VHS PV-C2780, Service Manual

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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 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.
AUDIO CONTROL
HEAD UNIT
MAIN C.B.A.
The Number of pins of the Connector.
Connector No. on Main C.B.A.
P4092 P4091
P4091 (4 Pins)
Ref. No. of the connection parts such as lead cable,
flexible cable which is supplied as a replacement parts.
3. Parts enclosed in dashed lines marked "Z" are not used in any models included in this service manual.
Example:
R3002
10K
Z
C3010
0.01
4. The part number shown on this drawing is only main part number,
except for safety parts. Be sure to make your orders of replacement parts according to the parts list.
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