SECTION 3
CHARTS AND DIAGRAMS
NOTES OF SCHEMATIC DIAGRAM
Safety precautions
The Components identified by the symbol are
critical for safety. For continued safety, replace safety
critical components only with manufacturer's recom-
mended parts.
1. Units of components on the schematic diagram
Unless otherwise specified.
1) All resistance values are in ohm, 1/6 W, 1/8 W (refer to
parts list).
Chip resistors are 1/16 W.
K: K
Ω
(1000
Ω
), M: M
Ω
(1000K
Ω
)
2) All capacitance values are in
µ
F, (P: PF).
3) All inductance values are in
µ
H, (m: mH).
4) All diodes are 1SS133, MA165 or 1N4148M (refer to parts
list).
2. Indications of control voltage
AUX : Active at high
AUX or AUX(L) : Active at low
4. Voltage measurement
1) Video circuits
Voltage are DC-measured (reference to ground) with a volt-
meter by suppling the color bar signal during print screen
mode.
—
: Unmeasurable or unnecessary to measure
2) Indication on schematic diagram
Voltage indications on the schematic diagram are as shown
below.
1
2
3
2.5
1.8
Note: If the voltages are not indicated on the schematic
diagram, refer to the voltage charts.
5. Waveform measurement
1) Video circuits
Waveforms are measured (reference to ground) with a color
bar signal during print screen mode.
2) Indication on schematic diagram
Waveform indications on the schematic diagram are as
shown below.
24
C331
11/10
22
20
18
16
WF25
C329
0.1/50
C330
0.1/50
R344
47K
R343
18K
R345
10K
R346
15K
Measurement point
Waveform number
3) Waveform indications
Waveform number
WF25
1.2 Vp-p
50 mV/2 msec/DIV
Waveform name or
measurement point
Level : 1.2 Vp-p
ALC OUT
Oscilloscope Volts and Time/Division, Probe 10 : 1
3. Interpreting Connector indications
1
2
3
1
2
3
1
2
3
1
4
2
3
Removable connector
Wire soldered directly on board
Non-removable Board connector
Board to Board
Connected pattern on board
The arrows indicate signal path
3-1
