– 14 –
C706
C711
C712
CNP701
C723
C709
R704
1
16
R701
R706
R721
R720
R725
R726
R715
R717
R740
JW705
JW703
JW713
1
52
13
14
26
27
39
40
C705
C724
C717
C721
C715
C707
C737
C738
IC701
TP (RF)
– CD board (conduction side) –
Adjustment Location:
CD SECTION
CD section adjustments are done automatically in this set.
In case of operation check, confirm that focus bias.
FOCUS BIAS CHECK
1. Connect the oscilloscope between IC701 pin
#£
(TP RF) and
GND on CD board.
2. Set the Test Disc YEDS-18 (CD). (Part No. : 3-702-101-01)
3. Press the
^
(CD) button.
4. Confirm that the oscilloscope waveform is as shown in the
figure below. (eye pattern)
A good eye pattern means that the diamond shape ( ) in the
center of the waveform can be clearly distinguished.
• RF signal reference waveform (eye pattern)
π
Test Point:
RF level :
1.2
±
0.1 Vp-p
VOLT/DIV : 200 mV (10 : 1 probe in use)
TIME/DIV : 500 nS
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensitivity.
L4
CT1
LW
TRACKING
ADJUSTMENT
CFT1
AM IF
ADJUSTMENT
IC1
TU1
TP (VT) (conductor side)
CNP2
CT4
L5
MW
FREQUENCY
COVERAGE
ADJUSTMENT
CT3
LW
FREQUENCY
COVERAGE
ADJUSTMENT
L3
CT2
MW
TRACKING
ADJUSTMENT
– MAIN board (component side) –
