JVC AV-20N83/BK Service Manual page 23

Measuring
Item
instrument
Remote
Adjustment
of control unit
SUB
COLOUR-I
Adjustment Signal
generator
of
SUB
Oscilloscope
COLOUR-II
Remote
control unit
Cy
Y G
W
AV-20N83 , AV-20N83
/BK /VT
AV-21D83 , AV-21D83
/BK /VT
Table 1
Test point Adjustment part
5. COLOUR
TP-47G 5. COLOUR
TP-E (H)
[MAIN
PWB (CRT
SOCKET)]
B
Mg
R
(A)
(–)
0V
(+)
A (V )
W-G
PAL SECAM NTSC3.58
+8V +6V -12V
+11V +13V +2V
[Method of adjustment without measuring instrument]
Notes:
• Proceed to the following adjustment after having completed the ad-
justment of SUB CONT.
• Set PICTURE MODE (VSM) to "BRIGHT".
– PAL COLOUR –
1. Receive a PAL broadcast.
2. Select 2. VC from the SERVICE MENU.
3. Select 5. COLOUR with the MENU &/^ key.
4. Set the initial setting value for PAL COLOUR with the MENU */Tkey.
5. If the colour is not best with the initial setting value, make fine ad-
justment until you get the best colour.
6. Press the DISPLAY key twice to return to the normal screen.
– SECAM COLOUR –
7. Receive a SECAM broadcast.
8. Press the COLOUR SYSTEM button on the remote control unit to
select the SECAM colour system.
9. Make fine adjustment of SECAM COLOUR in the same way as for
"PAL COLOUR".
– NTSC 3.58 COLOUR –
10. Receive a NTSC 3.58MHz broadcast.
11. Press the COLOUR SYSTEM button on the remote control unit to
select the NTSC 3.58 colour system.
12. Make similar fine adjustment of NTSC 3.58 COLOUR in the same
way as for "PAL COLOUR".
– NTSC 4.43 COLOUR –
When adjustment is done for NTSC 3.58 COLOUR, appropriate
values are automatically set for NTSC 4.43 COLOUR.
[Method of adjustment using measuring instrument]
Notes:
• Proceed to the following adjustment after having completed the ad-
justment of SUB CONT.
• Set PICTURE MODE (VSM) to "BRIGHT".
– PAL COLOUR –
1. Receive a PAL colour bar signal (full field colour bar 75% white).
2. Select 2. VC from the SERVICE MENU.
3. Select 5. COLOUR with the MENU &/^ key.
4. Set the initial setting value of PAL COLOUR with the MENU */Tkey.
5. Connect the oscilloscope between TP-47G and TP-E.
6. Adjust PAL COLOUR to set the value (A) in the figure to voltage as
shown in Table 1.
– SECAM COLOUR –
7. Receive a SECAM colour bar signal (full field colour bar 75% white).
8. Press the COLOUR SYSTEM button on the remote control unit to
select the SECAM colour system.
9. Set the initial setting value of SECAM COLOUR with the MENU */Tkey.
10. Adjust SECAM COLOUR to set the value (A) in the figure to volt-
age as shown in Table 1.
– NTSC 3.58 COLOUR –
11. Receive a NTSC 3.58 colour bar signal (full field colour bar 75% white).
12. Press the COLOUR SYSTEM button on the remote control unit to
select the NTSC 3.58 colour system.
13. Set the initial setting value of NTSC 3.58 COLOUR with the MENU
*/Tkey.
14. Adjust NTSC 3.58 COLOUR to set the value (A) in the figure to
voltage as shown in Table 1.
– NTSC 4.43 COLOUR –
When adjustment is done for NTSC 3.58 COLOUR, appropriate
values are automatically set for NTSC 4.43 COLOUR.
No. 52076
AV-20N83
AV-21D83
Description
23