– 21 –
VT(RF)
– CD board (conductor side) –
TP(RF)
5-3. CD SECTION
CD section adjustments are done automatically in this set.
In case of operation check, confirm that focus bias.
FOCUS BIAS CHECK
Procedure:
1. Connect the oscilloscope between IC701 pin
ed
(or TP (RF))
and GND on CD board.
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the CD
N
X
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.
Test Point:
VOLT/DIV: 50 mV
TIME/DIV: 500 ns
RF level:
1.15
±
0.2 Vp-p
• RF signal reference waveform (eye pattern)
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensitivity.
5-2. LOOP ANTENNA SECTION
Antenna Adjustment
Setting:
77.5 kHz frequency
no modulation
Procedure:
1. Connect the oscilloscope between TP601 and TP602 on the
CL/RECEIVER board.
2. Adjust L601 on the CL/RECEIVER board for a maximum
waveform level on the oscilloscope.
Adjustment Location:
Put the lead-wire
antenna close to
the supplied
loop antenna.
AM RF signal
generator
TP601
– CL/RECEIVER board (conductor side) –
L601
RADIO-CONTROLLED
CLOCK
FERRITE-ROD
ANTENNA
TP602
oscilloscope
(DC range)
Probe
10:1 10M
Ω
CL/RECEIVER board
TP601
TP602
