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Grundig VS 680 VPT Serviceanleitung Seite 138

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6. Matrix adjustment
EE mode
R 3990
B-signal amplitude | Oscilloscope:
BS 2-2
(Colour bar
(Linearity)
|
linear
Trigger: Like adjustment 2. | test signal)
R 4505
ee,
(Amplitude)
10 ps/ cm
Ae
Oscilloscope:
BS 2-3
Trigger: Like adjustment 2.
pp
R-signal amplitude
Cine
0,55 Vio
linear
R 4520
(Amplitude)
10 ps /cm
R 4535
(Linearity)
R 4540
(Amplitude)
Oscilloscope:
BS 2-4
Trigger: Like adjustment 2.
G-signal amplitude
EE mode
(Colour bar
test signal)
7. Output voltage of
the A/D converter
- Y-amplitude
Oscilloscope: IC 4210-(16)
Trigger: Like adjustment 2.
- U-amplitude
- V-amplitude
Oscilloscope: IC 4250-(13)
Trigger: Like adjustment 2.
EE mode
(Colour bar
test signal)
8, Output voltage of
the D/A converter
Y-amplitude
(Memory)
Set the amplitude of the Y-signal (Memory) - !C
4490-(8) - to the same amplitude as that of the
Bypass - IC 4555-(8).
Oscilloscope: IC 4555-(8)
IC 4490-(8)
Trigger: Like adjustment 2.
Set the amplitude of the U-signal (Memory) - IC
4490-(4) - to the same amplitude as that of the
Bypass - IC 4555-(2).
Oscilloscope: !C 4555-(2)
IC 4490-(4)
Trigger: Like adjustment 2.
- U-amplitude
(Memory)
Set the amplitude of the V-signal (Memory) - IC
4490-{10) - to the same amplitude as that of the
Bypass - IC 4555-(3).
Regolare la frequenza 15625 Hz + 10 Hz.
~ U-amplitude
(Memory)
Oscilloscope: !C 4555-(3)
IC 4490-(10)
Trigger: Like adjustment 2.
C1 > Taratura
Preparazione
Funziona-
Regolazione
mento
Frequenzimetro:
Funzionam. EE
IC 3910-(14)
senza segnale
R 3905
IC 4130-(14)
R 4125
Oscilloscopio:
Funzionam. EE
canale A: IC 3840-(24)
canale B: spina BS 1-2
trigger: canale B (H)
1. Freq. reg. libero
- bypass
- memoria
Regolare imp. orizz. a 4,5 V. Controllare amp. burst
(B > 8V) ed amp. impulso vert. (2V...3V).
B>8V
2. Ampiezza impulso
SSc
- bypass
R 3920
H = 4,5V
V=2...3V
<1,1V
R4140
°
Funzionam. EE
Vv
R 3930
Vv
R 4150
Collegare IC 3840-(28) /IC
| Funzionam. EE
4040-(28) a +12 V.
(monoscopio
barre colore
PAL)
L 3806
L 4007
C 3838
C 4038
Oscilloscopio:
canale A: !C 4040-(24)
canale B: spina BS 1-5
trigger: canale B (H)
- memoria
20 ps /cm
2. semiquadro
100 ps /cm
. Largh. imp. V
- bypass
Oscilloscopio:
canale A:
pun. mis.
canale B: spina BS 1-2
trigger: canale B (V)
Oscilloscopio:
canale A:
pun. mis.
canale B: spina BS 1-5
trigger: canale B (V)
- memoria
20 ps / em aa"
oe
16 ps ——>|
a
or | nee |
haar | ba
n, |
. Taratura PAL
ampiezza croma
trigger: v. taratura 2
Fermare le barre colore in movimento sullo scher-
mo. Infine togliere i collegamenti tra pin 17 e massa
e tra pin 28 e +12V.
Collegare IC 3840-(17) /1C
4040-(17) a massa.
Oscill. colore
- bypass
- memoria
168

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