JVC DR-MV2SEU, Service Manual

Page: 49 / 99

SCHEMATIC DIAGRAMS / CBA' S AND TEST POINTS
Standard Notes
WARNING
Notes:
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 " " 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.
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.
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 uF (P=10
-6
uF).
5. All voltages are DC voltages unless otherwise specified.
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.
LIST OF CAUTION, NOTES, AND SYMBOLS USED IN THE SCHEMATIC
DIAGRAMS ON THE FOLLOWING PAGES:
1. CAUTION:
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.
3. Note:
1. 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.
2. 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. Voltage indications for PLAY and REC mode on the schematics are as shown below:
5. How to read converged lines
6. Test Point Information
1-D3
Distinction Area
Line Number
(1 to 3 digits)
Examples:
1. "1-D3" means that line number "1" goes to the line number
"1" of the area "D3".
2. "1-B1" means that line number "1" goes to the line number
"1" of the area "B1".
3
2
1
A B C D
1-B1
1-D3
AREA D3
AREA B1
: 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.
2 3 1
5.0
(2.5)
PLAY mode
STOP mode
5.0
The same voltage for
both PLAY & STOP modes Indicates that the voltage
is not consistent here.
< DVD Section >
2 3 1
5.0
(2.5)
< >
PLAY mode
REC mode
DVD mode
5.0
The same voltage for
both PLAY, REC & DVD
modes
Indicates that the voltage
is not consistent here.
< VCR Section >
Unit: Volts
2-1 2-2