JVC AV-21B116, Service Manual

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1-4 (No.YA417)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 FEATURES
PICTURE MODE
This function can adjust the picture settings automatically.
There are BRIGHT, STANDARD and SOFT in the PICTURE
MODE.
This function can set a channel you frequently view to the
Return Channel and you can view that channel at any time with
one-touch.
CHILD LOCK
Use this function to prevent children from operating the TV
without parental consent.
VNR
This function can reduce the picture noise.
2.2 MAIN DIFFERENCE LIST
2.3 TECHNINAL INFORMATION
2.3.1 MAIN MI-COM (CPU) PIN FUNCTION
Item AV-21B116/B AV-V2160/B
Power Cord Flat pin type Round pin type
MAIN PWB SCG-1550A-BK SCG-1557A-BK
Pin
No.
Pin name I/O Function
Pin
No.
Pin name I/O Function
1 REMOCON I Remote control 22 PROTECT I Low B protect detection [Detect: H]
2 SDA2 I/O Data for Inter IC control (For main memory) 23 P_ON/OFF I Main power control [ON : H]
3 SCL2 O Clock for Inter IC contorl (For main memory) 24 LOCK - Not used
4 BUS_FREE - Not used 25 3.58/OTH - Not used
5 NC - Not used 26 4.5/OTH - Not used
6 KEY1 I Key scan for front key (Menu CH -/+) 27 H_SYNC I Horizontal sync
7 KEY2 I Key scan for front key (Vol -/+) 28 I/II - Not used
8 ECO IN - Not used 29 OSD_Ys O Ys (blanking) for OSD
9 AFT I AFT voltage for tuner 30 OSD_B O Blue for OSD
10 LED[POW] - Not used 31 OSD_G O Green for OSD
11 LED[TIM] O Liting for timer [Liting : H] 32 OSD_R O Red for OSD
12 GND - GND 33 NC - Not used
13 NC - Not used 34 RST I CPU reset [Reset:L]
14 NC - Not used 35 V_SYNC I Vertical sync
15 TV/V - Not used 36 TCLOCK - Not used
16 TEXT RESET - Not used 37 SDA1 I/O Data for Inter IC control (For generally)
17 ACL ON/OFF - Not used 38 SCL1 O Clock for Inter IC contorl (For generally)
18 VOL O Volume control 39 VDD I 3.3V
19 A_MUTE O Aodio muting [Muting : H] 40 OSC1 I System clock oscillation (4MHz)
20 NC - Not used 41 OSC2 O System clock oscillation (4MHz)
21 TEXT/OTH - Not used 42 VSS - GND