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CD SECTION
Note:
1. CD Block is basically constructed to operate without adjustment.
2. Use YEDS-18 disc (Part No. 3-702-101-01) unless otherwise indicat-
ed.
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 specifi ed value with the following checks.
5. Check the focus bias check when optical pick-up block is replaced.
FOCUS BIAS CHECK
oscilloscope
(DC range)
BD74UR board
CL102 (RFOUT)
+
CL117 (VREF)
–
Procedure :
1. Connect the oscilloscope to CL102 (RFOUT) and CL117
(VREF) on the BD74UR board.
2. Press the [
] button to turn the power on, and press the
?/1
[FUNCTION] button to select CD function.
3. Set disc (YEDS-18) and press the [u] button to playback.
4. Confi rm that oscilloscope waveform is as shown in the fi gure
below (eye pattern).
A good eye pattern means that the diamond shape (◊) in the
center of the waveform can be clearly distinguished.
Checking Location:
– BD74UR Board (Conductor Side) –
CL117
(VREF)
IC301
CL102
(RFOUT)
IC101
SECTION 4
ELECTRICAL CHECKS
FM AUTO STOP CHECK
Procedure :
1. Turn the power on.
2. Input the following signal from Signal Generator to FM an-
Carrier frequency : A = 87.5 MHz, B = 98 MHz, C = 108 MHz
Deviation
Modulation
ANT input
Note: Please use 75 ohm "coaxial cable" to connect SG and the set. You
3. Set to FM tuner function and scan the input FM signal with
4. Confi rm that input Frequency of A, B and C detected and auto-
The stop of automatic scanning means "The station signal is re-
ceived in good condition".
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level:
1.1 ± 0.4 Vp-p
0 dB = 1 μV
TUNER SECTION
signal
generator
set
tenna input directly.
: 75 kHz
: 1 kHz
: 35 dBu (EMF)
cannot use video cable for checking.
Please use SG whose output impedance is 75 ohm.
automatic scanning.
matic scanning stops.
HCD-EC59/EC590
13
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