Sanyo VCB-3440P Service Manual page 5

VIDEO OUTPUT (J400)
3-5. AUTO IRIS LEVEL ADJUSTMENT (BLC OFF)
Adjustment location: VR200 (6310-2)
Measuring location: T3 (6310-5)
Measuring equipment: Oscilloscope
Subject: Gray scale chart (γ =0.45)
Adjusting method:
1. Attach the automatic iris lens, and then display the gray
scale chart on full screen.
2. Adjust with VR200 so that the waveform level of T3 is 400
+10
mVp-p.
−20
3. Set the BLC switch (SW401) to the "BLC" position.
4. Check video level saturation status (max. 2 steps
saturation).
5. Return the BLC switch (SW401) to the "OFF" position.
450 ± 20 mVp-p
T3
770 ± 20 mVp-p
+10
400 mVp-p
−20
T3
3-6. LINE LOCK PHASE ADJUSTMENT
Adjustment location: VR400 (6310-4)
Measuring location: J400 (VIDEO OUT, 6310-4)
Measuring equipment: Oscilloscope
Subject: No designation
Adjusting method:
1. Connect the camera to a 230V AC/50 Hz power source.
2. The HOT (signal) side and COLD (GND) side of the
oscilloscope probe connect to the 230V AC terminals
respectively.
3. Turn VR400 (LINE LOCK PHASE) to adjust the leading edge
of the vertical sync signal and zero-cross shift of the 230V
AC power supply to 0 ± 0.2 ms.
230 V AC / 50Hz
24 V AC
TP123
J400
− 5 −
230V AC/GND terminals
zero cross
point
0 0.2 msec.