Sony CFD-S40CP Service Manual page 15

CD SECTION
Perform all CD section check and all adjustments in the test mode.
How to put the set into CD test mode
1. Press the POWER button turn the set ON.
2. Press the FUNCTION button to select CD.
3. Set Tset mode by momentarily shorting both side of TEST A.
4. Press the x button two times. The set is into CD test mode
(88 is displayed)
5. Turn the power off to release test mode.
CONTROL BOARD (Condustor side)
TEST mode : momentanly short
Focus Bias Check
1. Connect the oscilloscope between TP4003 (RF DC) and GND
on CD board.
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01) (CD)
3. Press the u button two times (LPC ON).
4. Confirm that the oscilloscope waveform is as shown in the fig-
ure below. (eye pattern)
A good eye pattern means that the diamond shape (◊) in the cen-
ter of the waveform can be clearly distinguished.
5. Press the u button.(LPC OFF)
6. Perform confirmation in step 4 again.
7. Insert the disc (TCD-W082L)(Part No:J-2502-063-2)(CD-RW)
8. Perform confirmation in step 3 to step 6.
• RF Signal Reference Waveform (eye pattern)
VOLT/DIV : 200mV
TIME/DIV : 500 nS
RF level
(CD)
0.8 – 1.2 Vp-p (LPC ON)
0.9 – 1.5 Vp-p (LPC OFF)
(CD-RW)
1.0 – 1.4 Vp-p (LPC ON)
0.7 – 1.3 Vp-p (LPC OFF)
When observing the eye pattern, set the oscilloscope for AC range
and raise certical sensitivity
CD BOARD (SIDE A)
Focus Erorr Adjustment
1. Connect the oscilloscope between TP4002(FE) and IC1007 10
pin on CD board.
2. Set to no disc and CD stop status.
3. Adjust RV1001 so that the center of the waveform meets the
specifications.
0V
Specifications :
A: –100mV to +100mV
CD BOARD (SIDE A)
Adjustment Location : See page 16
CFD-S40CP
oscilloscope
(AC range)
(GND)
Center of the waveform.
A
oscilloscope
(AC range)
TP 4002(FE)
IC 1007 10pin
15