Table of Contents
Advertisement
2-5. ELECTRICAL CHECKS
TUNER SECTION
FM TUNE LEVEL CHECK
signal
generator
Procedure:
1. Turn on the set.
2. Input the following signal from signal generator to FM antenna
input directly.
Carrier frequency: A = 87.5 MHz, B = 98 MHz, C = 108 MHz
Deviation
: 75 kHz
Modulation
: 1 kHz
ANT input
: 35 dBu (EMF)
Note: Use 75 ohm coaxial cable to connect signal generator and the set.
You cannot use video cable for checking.
Use signal generator whose output impedance is 75 ohm.
3. Set to FM tuner function and tune A, B and C signals.
4. Confirm "TUNED" is lit on the display for A, B and C signals.
When the selected station signal is received in good condition,
"TUNED" is displayed.
Note:
set
FOCUS BIAS CHECK
Procedure :
Checking Location:
CD SECTION
1. CD Block is basically constructed to operate without adjustment.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10 MΩ impedance.
4. Clean the object lens by an applicator with neutral detergent when the
signal level is low than specified value with the following checks.
5. Check the focus bias check when optical pick-up block is replaced.
CD board
TP121 (RFI)
TP124 (VC)
1. Connect oscilloscope to TP121 (RFI) and TP124 (VC) on the
CD board.
2. Press the
button to turn the power on, and press
I/1
the
button to open the disc tray.
Z
3. Set disc (YEDS-18) on the tray and press the
to playback.
4. Confirm that 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.
– CD Board (Conductor Side) –
TP124
(VC)
TP121
(RFI)
IC101
HCD-HX3/HX5/HX7
oscilloscope
(DC range)
+
–
button
CD u
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level:
0.9 ± 0.4 Vp-p
23
Advertisement
Chapters
Table of Contents
