Electrical Adjustment - Toshiba W-707 Service Manual

2. ELECTRICAL ADJUSTMENT

< Test equipment required >
Adjustment will be performed with the following test
equipment.
1. Color TV (Monitor)
2. Oscilloscope, 2 CHs, 15 MHz or higher with delay
system
3. Frequency counter (7 digits or higher)
4. Millivoltmeter
5. Digital voltmeter
6. Tester (20 kΩ/V)
7. Audio generator
8. Audio attenuator
9. Alignment tapes
Part code: ST-N1: 70909202
ST-NF: 70909203
ST-N5: 70909401
10. Alignment screw driver (jig)
11. Color pattern generator
12. Video sweep generator
< Color bar signal >
Color bar signals of 75% recorded on the alignment
tapes are shown in Fig. 2-1.
White(100%)
White(75%)
Burst
signal
0.7V
1V (p-p)
0.3V
l
H Sync signa
Color bar pattern
75%
Q
Color bar pattern
Burst
signal
Q I
I Black
Fig. 2-1
< Specified input output levels, and impedance >
Video input:
Video output:
Audio input:
Audio output:
< Alignment sequence >
Proceed the alignments in the sequence as shown in
Fig. 2-2.
Remote
Control
System
0.3V
Negative sync, standard composite
video signal 1 V(p-p), 75 Ω
Same as the video input,
1 V(p-p), 75 Ω
308mV(rms), more than 47 kΩ
308mV(rms), less than 4.7 kΩ
PIF System
Servo System
Video
Signal
System
Fig. 2-2
Audio
System