3-6
Fig. 3-5-2b DEMOD Fo-2
Pedestal level
R – Y signal
Blanking level
H.rate
Specified value (G)
(4) Adjust the adjustment part (F2) so that the difference be-
tween the blanking level and the pedestal level of the R-
Y waveform becomes the specified value (G).
3.5.3 Colour difference level
(1) Observe the C (converted colour) waveform at the meas-
uring point (D).
(2) Fine adjust the adjustment part (F1) so that the carrier
leak becomes the specified value (G1). In case the ad-
justment cannot be accomplished, after fine adjust the
adjustment part (F1) so that the carrier leak is reduced
to its minimum level then fine adjust the adjustment part
(F2).
(3) Adjust the adjustment part (F3) so that the higher level
of the Yellow and Blue of the C waveform becomes the
specified value (G2).
(4) Adjust the adjustment part (F4) so that the higher level
of the Green and Magenta of the C waveform becomes
the specified value (G3).
Signal
(A1)
• Ext. input
(A2)
• Color (colour) bar signal [SECAM]
Mode
(B)
• EE
Equipment
(C)
• Oscilloscope
Measuring point (D)
• TP3504 round (CONV’D COLOR)
Adjustment part
(F1)
• L3513 (SECAM DECODE ADJ.)
(F2)
• VR3502 (SECAM DECODE)
(F3)
• VR3506 (B-Y LEVEL ADJ.)
(F4)
• VR3505 (R-Y LEVEL ADJ.)
Specified value
(G1)
• Less than 30 mVp-p (CARRIER LEAK)
(G2)
• 460 ± 20 mVp-p : VR3506 (B-Y)
(G3)
• 620 ± 20 mVp-p : VR3505 (R-Y)
Fig. 3-5-3a Colour difference level
Fig. 3-5-4a PAL burst position
Colour burst signal
H-SYNC
C
(Converted colour)
Y
Specified value (G)
GREEN
YELLOW
BLUE
CARRIER
LEAK
MAGENTA
Specified
value (G1)
Specified
value (G3)
Specified
value (G2)
3.5.4
PAL burst position
(1) Observe the waveforms appeared at the measuring
points (D1) and (D2).
(2) Adjust the adjustment part (F) so that the waveforms tim-
ing width between the H-SYNC and the colour burst sig-
nal becomes the specified value (G).
Signal
(A1)
• Ext. input
(A2)
• Color (colour) bar signal [SECAM]
Mode
(B)
• EE
Equipment
(C)
• Oscilloscope
Measuring point (D1)
• CN3502 pin 1
(D2)
• TP3504 (CONV’D COLOR)
Adjustment part
(F)
• VR3503 (PAL BURST ADJ.)
Specified value
(G)
• Tr = 5.6 ± 0.1 µsec
Summary of Contents for HR-S6700MS
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