JVC AV-20F475S, Service Manual

Page: 5 / 27

(No.YA052)1-5
2.3 TECHNICAL INFORMATION
2.3.1 SYSTEM BLOCK DIAGRAM
2.3.2 MAIN MI-COM (CPU) PIN FUNCTION
S C L 1
S D A 1
A F T 1
SCL0 SDA0
S C L 0 S D A 0 S C L 0 S D A 0
MAIN MI-COM /
VIDEO PROCESS /
DEF. PROCESS
IC101
IF DET
TU001
TUNER
IC851
S C L 0 S D A 0
IC641
MTS
TONE/VOL
S C L 0 S D A 0
IC251
3-LINE YC SEP. AV SW
IC201
REMOCON
REMOCON
RECEIVER
IC702
MEMORY
Pin
No.
Pin name I/O Function
Pin
No.
Pin name I/O Function
1 MTS_ADJ I Not used 29 YC_GND - GND
2 AFT1 I AFT voltage for tuner (Tuning frequency control) 30 V1_IN I Not used
3 KEY I Key scan for front control [No signal : H] 31 ABCL I Current for automatic beam (brightness)/contrast limit
4 uP_DVss - GND 32 MONITOR_OUT O Not used
5 Reset I CPU reset [Reset : L] 33 BLACK_DET - Black level detection filter
6 8MHz_OUT O CPU system clock : 8MHz oscillation 34 NA O Not used
7 8MHz_IN I CPU system clock : 8MHz oscillation 35 APL_FIL - Average picture level filter
8 TEST - GND 36 APC_FIL - Automatic phase control filter
9 uP_DVdd I 5V 37 fsc_OUT O Color sub carrier (3.58MHz) for 3-line digital comb filter [IC251]
10 AGC_MUTE O AGC muting for tuner (when channel select) [Muting : H] 38 YC_Vcc I 5V (for video process circuit)
11 uP_VVss - GND 39 R_OUT O R signal
12 TV_HGND - GND 40 G_OUT O G signal
13 FBP_SCP I Flyback pulse (H. pulse) 41 B_OUT O B signal
14 HOUT O H. drive (oscillation) 42 RGB_Vcc I 9V (for RGB process circuit)
15 H_Vcc I 9V (for H. oscillation start) 43 IK_IN I Not used
16 HAFC_1 - H. AFC filter 44 TV_AGND - GND
17 Vsaw - V. saw filter 45 uP_AGND - GND
18 VOUT O V. drive 46 uP_AVdd I 5V
19 EW_OUT O Not used 47 MAIN_POWER O Power on/off switching control [Powen on : L]
20 X-RAY I X-ray detection (for protection) [Detection : H] 48 HAZARD I Not used
21 Ys I Not used 49 SDA0 I/O Data for Inter IC control bus (for various devices)
22 Cb_IN I Cb (external) signal 50 SCL0 O Clock for Inter IC control bus (for various devices)
23 Y_IN I Y (external) signal 51 SDA1 I/O Data for Inter IC control bus (for main memory)
24 Cr_IN I Cr (external) signal 52 AUDIO_MUTE O Audio muting [Muting : H]
25 TV_DVcc I 3.3V 53 SCL1 O Clock for Inter IC control bus (for main memory)
26 V3_IN/C_IN I Chroma signal (for YC separation output) 54 LED O POWER / ON TIMER LED lndication [lighting : L]
27 EHT_IN I Not used 55 REMOCON I Remote control sensor [No input : H]
28 V2_IN/Y_IN I Y signal (for YC separation output) 56 COMPULINK I Not used