HCD-RV555, MHC-RV555 - Sony Audio Service Manual (repair manual). Page 23

Read Sony HCD-RV555 / MHC-RV555 Service Manual online

23
HCD-RV555
SECTION 5
ELECTRICAL ADJUSTMENTS
– BD BOARD (SIDE B) –
TP4 (FE)
TP5 (RFAC)
TP10 (VC)
TP6
(RFDC)
TP2 (TE)
Note:
Clear RF signal waveform means that the shape “ 
◊ ” can be clearly
distinguished at the center of the waveform.
TRAVERSE LEVEL CHECK
Procedure:
1. Connect an oscilloscope to TP2 (TE) and TP10 (VC) on the
BD board.
2. Press the
I
/1
button to turn the power on.
3. Load the disc (LUV-P01) and playback the number nine track.
4. Press the  
hH
  button. (Becomes the 1 track jump mode.)
5. Confirm that the level B and A (DC voltage) on the oscilloscope
waveform.
Connecting Location:
Note:
1.
CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
2.
Use LUV-P01 (Part No. 4-999-032-01) unless otherwise indicated.
3.
Use an oscilloscope with more than 10 MW 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.
S-CURVE CHECK
Procedure:
1. Connect an oscilloscope to TP4 (FE) and TP10 (VC) on the
BD board.
2. Press the
I
/1
button to turn the power on.
3. Load the disc (LUV-P01) and actuate the focus search. (In
consequence of open and close the disc tray, actuate the focus
search)
4. Confirm that the oscilloscope waveform (S-curve) is
symmetrical between A and B. And confirm peak to peak level
within 2 
±
 0.5 Vp-p.
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
brightness to obtain best waveform.
RF LEVEL CHECK
Procedure:
1. Connect an oscilloscope CH1 to TP6 (RFDC), CH2 to TP5
(RFAC) and TP10 (VC) on the BD board.
2. Press the
I
/1
button to turn the power on.
3. Load the disc (LUV-P01) and playback the number nine track.
4. Confirm that oscilloscope waveform is clear and check if RF
signal level is correct or not.
level=1.2 
±
0.55Vp-p
symmetry
A (DC voltage)
center of
waveform
B
VC
1 track jump waveform
TP2 (TE)
TP10 (VC)
BD board
+
oscilloscope
RF signal waveform
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 0.75 
±
0.1Vp-p (RFDC)
1.05 
±
0.3Vp-p (RFAC)
+
oscilloscope
TP6 (RFDC)
TP5 (RFAC)
BD board
TP10 (VC)
symmetry
S-curve waveform
within 2 
±
0.5Vp-p
A
B
+
oscilloscope
BD board
TP4 (FE)
TP10 (VC)
CD SECTION
Page of 84
Display

Click on the first or last page to see other HCD-RV555 / MHC-RV555 service manuals if exist.