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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 M 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 check.
RF SIGNAL CHECK
oscilloscope
(DC range)
MAIN board
TP27 (PUHRF)
+
TP31 (VREF1)
–
Procedure:
1. Connect the oscilloscope to TP27 (PUHRF) and TP31
(VREF1) on the MAIN board.
2. Press the [
/
] button to turn the power on.
?
1
3. Press the [FUNCTION] button to turn the CD function.
4. Press the [
] button to open the disc tray.
Z
5. Set the disc (YEDS-18) on the disc tray.
6. Press the [
] button to close the disc tray.
Z
7. Press the [
] button to playback.
u
8. 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.
VOLT/DIV: 200 mV
TIME/DIV: 400 ns
level: 1.2 ± 0.2 Vp-p
Connection Location:
– MAIN Board (Conductor Side) –
TP31
(VREF1)
TP27
(PUHRF)
HCD-ECL77BT/ECL99BT
SECTION 4
ELECTRICAL CHECK
TP31
(VREF1)
TP27
(PUHRF)
17
17
HCD-ECL77BT/ECL99BT
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