Loop Antenna Section; Cd Section - Sony ZS-2000 Service Manual

5-2. LOOP ANTENNA SECTION

Antenna Adjustment
Setting:
AM RF signal
generator
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:
– CL/RECEIVER board (conductor side) –

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 (
center of the waveform can be clearly distinguished.
• RF signal reference waveform (eye pattern)
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensitivity.
Put the lead-wire
antenna close to
the supplied
loop antenna.
L601
RADIO-CONTROLLED
CLOCK
FERRITE-ROD
ANTENNA
) in the
VOLT/DIV: 50 mV
TIME/DIV: 500 ns
RF level:
1.15 ± 0.2 Vp-p
CL/RECEIVER board
TP601
TP602
TP601
TP602
Test Point:
– CD board (conductor side) –
– 21 –
oscilloscope
(DC range)
Probe
10:1 10MΩ
VT(RF)
TP(RF)