Samsung CXJ1964BX/XAA, Service Manual

Page: 12 / 73

2.5 msec
CH-2 PROBE
H'D SW
PULSE
CH-1 PROBE
CTL PULSE
-Time/div. ; 5 msec
Setting of Scope
- Volt/div. ; CH-1 = 0.1V
CH-2 = 0.2V
6.5 msec
CH-2 PROBE
H'D SW
PULSE
CH-1 PROBE
CTL PULSE
-Time/div. ; 5 msec
Setting of Scope
- Volt/div. ; CH-1 = 0.1V
CH-2 = 0.2V
Alignments and Adjustments (VCR)
3-4
Samsung Electronics
3-2-2(E) LINEARITY ADJUSTMENT
(GUIDE ROLLER S,T ADJUSTMENT)
Fig. 3-8 (A) Tracking Preset Adjustment (4HD)
Fig. 3-8 (B) Tracking Preset Adjustment (2HD)
SCOPE SETTINGS
Fig. 3-9 Control Pulse Adjustment
CONTROL PULSE REMOVE
REMOTE
BUTTONS
_
+
_
+
Fig. 3-10 Test Point Position (Main PCB : Parts)
Test Points : JM113-H’D SW (head switching sync)
JM114-EnV (envelope waveform)
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
Fig. 2-6 Envelope Waveform Adjustment
a
a b c d
c,b,d/a 63%
b
c
d