Scope Settings; Linearity Adjustment - Samsung CXJ1331/TUCX Service Manual

Alignments and Adjustments (VCR)

SCOPE SETTINGS

Setting of Scope
- Volt/div. ; CH-1 = 0.1V
CH-2 = 0.2V
CH-2 PROBE
H'D SW
PULSE
CH-1 PROBE
CTL PULSE
Fig. 3-8 (A) Tracking Preset Adjustment (4HD)
Setting of Scope
- Volt/div. ; CH-1 = 0.1V
CH-2 = 0.2V
CH-2 PROBE
H'D SW
PULSE
CH-1 PROBE
CTL PULSE
Fig. 3-8 (B) Tracking Preset Adjustment (2HD)
REMOTE
CONTROL PULSE REMOVE
BUTTONS
_
+
_
+
Fig. 3-9 Control Pulse Adjustment
3-4
-Time/div. ; 5 msec
6.5 msec
-Time/div. ; 5 msec
2.5 msec
3-2-2(C) LINEARITY ADJUSTMENT
(GUIDE ROLLER S,T ADJUSTMENT)
Test Points : JM113-H'D SW (head switching sync)
JM114-EnV (envelope waveform)
Fig. 3-10 Test Point Position (Main PCB : Parts)
1. Play back the Mono Scope alignment tape (SP
Mode).
2. Observe the video envelope signal on the
oscilloscope after taking sync with the video
switching pulse.
3. Make sure that the video envelope meets the
specifications of Fig. 3-11 (especially for
minimum values).
Note :
a = Maximum output of the video RF envelope
b = Minimum output of the video RF envelope at the
entrance side
c = Minimum output of the video RF envelope at
the center point
d = Maximum output of the video RF envelope at the exit
side
a
b
Fig. 3-11 Envelope Waveform Adjustment
c d
a b c d
c,b,d/a 63%
Samsung Electronics