Daewoo DUB-2850, Руководство по обслуживанию

Страница: 16 / 79

-16-
CP-780 Service Manual
4.1.3. PINNING
QFP 128pin Symbol Short Description
1 VSSP2 Ground
2 VSSC4 Ground
3 VDDC4 digital supply to SDACs (1.8V)
4 VDDA3(3.3V) supply (3.3 V)
5 VREF_POS_LSL positive reference voltage SDAC (3.3 V)
6 VREF_HPL negative reference voltage SDAC (0 V)
7 VREF_HPR positive reference voltage SDAC (3.3 V)
8 VREF_HPR negative reference voltage SDAC (0 V)
9 VREF_POS_HPR positive reference voltage SDAC (3.3 V)
10 XTALIN crystal oscillator input
11 XTALOUT crystal oscillator output
12 VSSA1 Ground
13 VGUARD/SWIO V-guard input / I/O switch (e.g. 4 mA current
sinking capability for direct drive of LEDs)
14 DECDIG decoupling digital supply
15 VP1 1st supply voltage TV-processor (+5 V)
16 PH2LF phase-2 filter
17 PH1LF phase-1 filter
18 GND1 ground 1 for TV-processor
19 SECPLL SECAM PLL decoupling
20 DECBG bandgap decoupling
21 EWD/AVL (1) East-West drive output or AVL capacitor
22 VDRB vertical drive B output
23 VDRA vertical drive A output
24 VIFIN1 IF input 1
25 VIFIN2 IF input 2
26 VSC vertical sawtooth capacitor
27 IREF reference current input
28 GNDIF ground connection for IF amplifier
29 SIFIN1/DVBIN1 (2) SIF input 1 / DVB input 1
30 SIFIN2/DVBIN2 (2) SIF input 2 / DVB input 2
31 AGCOUT tuner AGC output
32 EHTO EHT/overvoltage protection input
33
AVL/SWO/SSIF/ REFO/REFIN (2)
Automatic Volume Levelling / switch
output / sound IF input / subcarrier
reference output / external reference
signal input for I signal mixer for DVB
operation
34 AUDIOIN5L audio-5 input (left signal)
35 AUDIOIN5R audio-5 input (right signal)
36 AUDOUTSL audio output for SCART/CINCH (left
signal)
37 AUDOUTSR audio output for SCART/CINCH (right
signal)
38 DECSDEM decoupling sound demodulator