Casio TV-880C Manual page 10

3.Free running frequency adjustment
• Conditions
(1) Signal
No signal (PAL standard signal should be applied only at synchronous check)
(2) Signal level
Input electric field only at synchronous check: 70 dBµ (terminated with 75-ohm resistance),
P/S = 7 dB
(3) Other conditions
UK IF input only at synchronous check (input electric field with 75-ohm termination).
Connect SYF terminal (CP729) and VCC2-7.
Power supply: Vcc1-1 = 5.0 ± 0.05 [V]
Room temperature: 20 ± 10 [°C]
• Adjustment
Monitoring HDB (CP305) with a frequency counter, adjust VR700 so that the frequency is 15.625 ±
0.1 [kHz].
• Caution
(1) Disconnect the wire between SYF terminal and VCC2-7.
Applying IF signal make sure that synchronization is normal on the display.
(2) Use input signal pattern conforming UK standard.
• Block diagram
Signal
generator
VCC1-1
Stabilizer
4.Contrast adjustment
• Conditions
(1) Signal
Broadcasting system: I
Color system: PAL color bar
(2) Signal level
Input electric field: 70 dBµ (terminated with 75-ohm resistance), P/S = 7 dB
(3) Other conditions
UK IF input (input electric field should be terminated with 75-ohm resistance).
Apply voltage of Vcc1-1 = 5.0 ± 0.05 [V]
• Adjustment
Connect color terminal (CP320) to GND (CP300) so that screen becomes black and white. Adjust
contrast pot VR300 so that the voltage between pedestal level and white level of B signal (CP740) is
0.80 ± 0.05 [Vp-p].
SYF
HD
L-PCB
— 8 —
VCC2-7
Frequency
Counter