Specific Service Instructions - JVC AV-20RM4SE Service Manual

2.1 FEATURES
• It is a remote controlled color television.
• It can tune cable channels.
• Controlling the TV is very easy by its menu driven system.
• It has 1 Euroconnector sockets for external device.
• Front AV Input available.
• Simple teletext (Toptext, WST) system.
• It is possible to connect headphone.
• Direct channel access.
2.2 MAIN DIFFERENCE LIST
Item
MAIN PWB ASSY
TV RF System
Colour System (TV mode)
TV RF System
2.3 21-PIN EURO CONNECTOR (SCART) : EXT-1
Pin No. Signal designation
1 AUDIO R output
2 AUDIO R input
3 AUDIO L output
4 AUDIO GND
5 GND (B)
6 AUDIO L input
7 B input
8 FUNCTION SW (SLOW SW)
9 GND (G)
10 SCL / T-V LINK
11 G input
12 SDA3
13 GND (R)
14 GND (YS)
15 R / C input
16 Ys input (FAST SW)
17 GND (VIDEO output)
18 GND (VIDEO input)
19 VIDEO output
20 VIDEO / Y input
21 COMMON GND
(P-P= Peak to Peak, B-W= Blanking to white peak)
SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

AV-20RM4SE AV-21RM4SE
VE-20161051 VE-20161048
B/G,D/K
PAL, SECAM
B/G,D/K
Matching value
500mV(rms) (Nominal), Low impedance
500mV(rms) (Nominal), High impedance
500mV(rms) (Nominal), Low impedance
---
---
500mV(rms) (Nominal), High impedance
, 75 Ω
700mV
(B-W)
Low : 0V-3V
High : 8V-12V, High impedance
---
---
700mV(B-W), 75 Ω
---
---
---
, 75 Ω
R : 700mV
(B-W)
, 75 Ω
C : 300mV
(P-P)
Low : 0V-0.4V, 75 Ω
High : 1V-3V, 75 Ω
---
---
(Negative sync),75 Ω
1V
(P-P)
(Negative sync), 75 Ω
1V
(P-P)
---
Pin assignment
20 18 16 14 12 10 8
21 19 17 15 13 11 9
• APS (Automatic Programming System).
• All programs can be named.
• Forward or backward automatic tuning.
• Sleep timer.
• Child Lock.
• Automatic sound mute when no transmission.
• 5 minutes after the broadcasting (closedown), the TV switches
itself automatically to stand-by mode.
AV-21RM4SN
VE-20161045
←
B/G
←
PAL
←
B/G
Used (TV OUT)
Used (R1)
Used (TV OUT)
Used
Used
Used (L1)
Used
Used
Used
Not used
Used
Not used
Used
Used
Used (R)
Used
Used
Used
Used (TV OUT)
Used
Used
6 4 2
7 5 3 1
AV-21RM4SP
VE-20161041
B/G, L
PAL, SECAM
B/G, L
EXT-1
(No.YA080)1-5