Changhong Electric 34T18, Service Manual, Page: 55 / 61

SERVICE MANUAL
53
3
ADC input range D upper limit
voltage. Stabilize by attaching a
0.01µF capacitor.
3.15 0.64 0.63
4
ADC input. Inputs 1.0 Vp-p video
signal. Sync tip clamp is performed.
2.14 ∞ ∞
5
ADC input range D lower limit
voltage. Stabilize by attaching a
0.01µF capacitor.
1.84 0.497 0.49
6 ADC and DAC logic power supply. 4.98 0.55 0.55
7
Logic and internal DRAM GND
(digital).
0 0 0
8 Internal DRAM power supply 4.98 0.55 0.55
9 I
2
C BUS SDA 4.12 6.39 6.44
10 I
2
C BUS SCL 4.25 6.4 6.45
11
Shipment test mode switch or I
2
C
bus setting reset pin.
0 0 0
12
Y signal comb function ON / OFF
switch.
0 0 0
13 Clock input pin. 2.54
∞ ∞
14
Connect the APC filter in the 8 fsc
PLL circuit
0
∞ ∞
15 PLL power supply 4.98 0.55 0.55
16 ADC, DAC, and PLL GND (analog). 0 0 0
17 Outputs chrominance signal. 2.25
∞ ∞
18
DAC output range D upper limit
voltage.
3.14 0.57 0.57
19
DAC output range D lower limit
voltage
1.84 0.42 .043
20 Outputs luminance signal. 2.16
∞ ∞