HCD-DJ2i
25
Note:
1. CD Block is basically designed to operate without
adjustment. Therefore, check each item in order given.
2. Use YEDS-18 (Part No. 3-702-101-01) unless otherwise
indicated.
3. Use an oscilloscope with more than 10M
Ω
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.
TEST DISC LIST
Use the following test disc on electrical checks.
YEDS-18 (Part No. 3-702-101-01) or
PATD-012 (Part No. 4-225-203-01)
S-CURVE CHECK
+
–
BD93 board
oscilloscope
(DC range)
TP106 (FE)
TP124 (VC)
Procedure :
1. Connect an oscilloscope to TP106 (FE) and TP124 (VC) on
BD93 board.
2. Turn the power ON.
3. Load a disc (YEDS-18) and actuate the focus search. (In
consequence of open and close the disc tray, actuate the focus
search)
4. Confi rm that the oscilloscope waveform (S-curve) is
symmetrical between A and B. And confi rm peak to peak
level within 1.8 ± 0.5 Vp-p.
symmetry
S-curve waveform
within 1.8 ± 0.5 Vp-p
A
B
Note:
•
Try to measure several times to make sure than the ratio of
A : B or B : A is more than 10 : 7.
•
Take sweep time as long as possible and light up the bright-
ness to obtain best waveform.
SECTION 5
ELECTRICAL ADJUSTMENTS
RF LEVEL CHECK
+
–
BD93 board
oscilloscope
(DC range)
TP123 (RFO)
TP124 (VC)
Procedure :
1. Connect an oscilloscope to TP123 (RFO) and TP124 (VC) on
BD93 board.
2. Turn the power ON.
3. Load a disc (YEDS-18) and playback.
4. Confi rm that oscilloscope waveform is clear and check if RF
signal level is correct or not.
Note:
Clear RF signal waveform means that the shape “
◊
” can be
clearly distinguished at the center of the waveform.
RF signal waveform
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level: 1.3 ± 0.3 Vp-p
Connecting Location :
BD93 board
TP106 (FE)
IC101
TP123 (RFO)
TP124 (VC)
– BD93 Board (Conductor Side) –
CD SECTION