2 SCHEMATIC DIAGRAMS
2.1. SCHEMATIC DIAGRAM & 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 no 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
C6014
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.
Model No. Identification Mark
1
Connecting Point
2
Volts/Div
3
Operation Mode of
VCR
4
Time/Div
5
Waveform Point on
Schematic
PIN1 OF IC3001
0.5V
REC
20µs
WF5
1
2
3
4
5
COMPARISON CHART OF MODELS & MARKS
NV-DS30EN
NV-DS30ENT
NV-DS30ENC
NV-DS30A
NV-DS50EN
NV-DS50ENT
NV-DS50A
Not Used
NV-DS29EG
NV-DS20EGM
NV-DS29B
NV-DS29EGE
NV-DS30EG
NV-DS30EGM
NV-DS30B
NV-DS30EGE
A
B
C
D
E
F
G
H
MODEL
MARK
I
J
K
L
M
N
O
PT
MODEL
MARK
Note : Refer to item 3 of Schematic Diagram Notes for mark "PT".
NV-DS29EG/NV-DS29EGM/NV-DS29B/NV-DS29EGE/NV-DS30EG/NV-DS30EGM/NV-DS30B/NV-DS30EGE/
NV-DS30EN/NV-DS30ENT/NV-DS30ENC/NV-DS30A/NV-DS50EN/NV-DS50ENT/NV-DS50A
NV-DS30EG / NV-DS30EGM / NV-DS30B / NV-DS30EGE / NV-DS30EN / NV-DS30ENT / NV-DS30ENC / NV-DS30A
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