Adjustment - Sanyo VCB-3440P Service Manual

3. ADJUSTMENT

3-1. ADJUSTMENT PREPARATION
1. Use the 5,100K viewer for the subject.
2. Set the ITE gray scale chart II (γ =0.45) to the viewer.
3. Set the angle of adjustment control (VR) before starting
adjustment at the center or temporary adjustment (nearly
adjusted) unless specified.
4. Set the trigger signal of oscilloscope to VIDEO OUT, and
apply H sync unless specified.
5. If no switch position is specified, the auto-iris lens switch
position should be above (SW200). The other switches
should be default (LL,AI, BLC OFF, AGC, SHUTTER →
"0" ).
6. The VIDEO OUT connector (J400) connect to a video
monitor terminated in 75 Ω input impedance.
5,100 K viewer
H
(H + h) 2
X f − 12.5 mm
L =
H X h
L: Distance from CS mount to pattern (mm)
H: Pattern height (mm)
f : Lens focal length (standard 12.5 mm)
h: Height (4.8 mm) of CCD imaging surface
Note : The video monitor should be an under-scan TV.
3-2. VCO VOLTAGE ADJUSTMENT
Adjustment location: C587 (6310-5)
Measuring location: PLLN (6310-5)
J400 (VIDEO OUT, 6310-4)
Measuring equipment: Oscilloscope
Subject: No designation
Adjusting method:
1. Adjust the C587 so that the waveform width of PLLN is min.&
stable (negative pulse) (pulse width < 250us).
CCD camera
L
CS mount surface
3-3. VSUB & VRG VOLTAGE ADJUSTMENT
Adjustment location: VR501 (VSUB, 6310-5)
Measuring location: T3 (6310-5)
Measuring equipment: Oscilloscope
Subject: Gray scale chart (γ =0.45)
Adjusting method:
1. Display the gray scale chart on full screen.
2. Adjust the lens aperture so that the gray scal level is 4
levels.
3. Adjust the VR501(VSUB) so that the waveform of T3 is clear
picture (uniformity).
4. Adjust the VR502(VRG) so that the waveform of T3 is max
amplitude (uniformity).
5. Adjust the lens aperture to have full white clear picture.
6. Repeat item 2 ~ 5 until camera has clear picture
(uniformity).
3-4. AGC LEVEL ADJUSTMENT (BLC OFF)
Adjustment location: VR500 (VAGC, 6310-5)
Measuring location: J400 (VIDEO OUT, 6310-4)
Measuring equipment: Oscilloscope
Subject: Gray scale chart (γ =0.45)
Adjusting method:
1. Display the gray scale chart on full screen.
2. Adjust the lens aperture so that the waveform level of T3 is
450 ± 20 mVp-p.
3. Adjust with VR500 so that the waveform level is 770 ± 20
mVp-p during video output (J400).
− 4 −
VR502 (VRG, 6310-5)
J400 (VIDEO OUT, 6310-4)
T3
T3 (6310-5)