SECTION 4 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 recommended 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 or k: k (1000 ), M: M (1000k ) 2) All capacitance values are in µF, (P: PF). 3) All inductance values are in µH, (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 3. Interpreting Connector indications
1 2 3 1 2 3
4) Indication on schematic diagram Voltage Indications for REC and PB mode on the schematic diagram are as shown below.
1 REC mode 2.5 (5.0) PB mode 1.8
2
3
PB and REC modes (Voltage of PB and REC modes are the same)
Note: If the voltages are not indicated on the schematic diagram, refer to the voltage charts. 5. Waveform measurement 1) Video circuits REC : Colour bar signal in SP mode, normal VHS mode PB : Alignment tape, colour bar SP mode, normal VHS mode 2) Audio circuits REC : 1KHz, �8 dBs sine wave signal in SP mode, normal VHS mode PB : REC then playback it 3) Movie Camera circuits Measured using a correctly illuminated gray scale or colour bar test chatrs in the E-E mode 4) Indication on schematic diagram Waveform indications on the schematic diagram are as shown below.
Measurement point
Removable connector
Wire soldered directly on board
16 18 20 22 24
1 2 3
R344 47K
Waveform number
Non-removable Board connector
C329 C330 0.1/50 0.1/50 C331 11/10
WF25
1 2 3 4
Board to Board
R343 18K
R345 10K
R346 15K
Connected pattern on board The arrows indicate signal path
5) Waveform indications
Waveform number Waveform name or measurement point ALC OUT
4. Voltage measurement 1) Video circuits REC : Colour bar signal in SP mode, normal VHS mode PB : Alignment tape, colour bar SP mode, normal VHS mode � : Unmeasurable or unnecessary to measure 2) Audio circuits REC : 1KHz, �8 dBs sine wave signal in SP mode, Normal VHS mode PB : REC then playback it 3) Movie Camera circuits Measured using a correctly illuminated gray scale or colour bar test charts in the E-E mode
WF25
REC/PB 1.2 Vp-p 50 mV/2 msec/DIV
Level : 1.2 Vp-p
Oscilloscope Volts and Time/Division, Probe 10 : 1 Mode : REC or PB modes
