— 23 —
4. D-PCB Assy
4-1. VCO free run frequency adjustment
1. Adjustment procedure
• Make sure
VCC5 (CP344) = 5.0 ± 0.05 [V]
VCC15 (CP391) = 15.0 ± 0.45 [V]
VCC7 (CP390) = 8.0 ± 0.05 [V]
VCC3 (CP220) = 3.3 ± 0.08 [V]
• Room temperature should be 20 ± 10 °C
2. Preparation
• AC adaptor or voltage regulator
• Frequency counter
3. Adjustment and checking
(1) Connect SYF (CP355) and GND (CP350).
(2) Monitor HDB (CP704) with frequency counter and adjust VR320 so that frequency becomes 15.734
± 0.1 KHz.
(3) After completing adjustment, disconnect SYF (CP7033) and GND (CP700).
4-2. VCOM AC adjustment and VCOM DC coarse adjustment
1. Adjustment procedure
• Make sure
VCC5 (CP344) = 5.0 ± 0.05 [V]
VCC15 (CP391) = 15.0 ± 0.45 [V]
VCC7 (CP390) = 8.0 ± 0.05 [V]
VCC3 (CP220) = 3.3 ± 0.08 [V]
2. Preparation
• AC adaptor or voltage regulator
• Frequency counter
3. Adjustment procedure
(1) Make sure amplitude of VCOM output (CP364) is 6.6 ± 0.3 V.
(2) Adjust VR321 so that maximum VCOM output (CP364) will be 4.8 ± 0.2 V.
4. Note
When unable to adjust using AC adaptor, use voltage regulator and supply power to be VCC1-1 (CP105)
= 5.0 ± 0.05 V.
To Next Page
Loading...
