Sony D-FJ211 Service Manual page 8

D-FJ211
CD SECTION
The CD section adjustments are done automatically in this set.
Precautions for Check
1. Perform check in the order given.
2. Use YEDS-18 disc (Part No.: 3-702-101-01) unless otherwise
indicated.
3. Power supply voltage requirement : DC4.5 V in DC IN jack.
VOLUME button : Minimum
HOLD switch : OFF
8
(J401)
RF Level Check
Condition:
• Hold the set in horizontal state.
Connection:
oscilloscope
(AC range)
TJ601(RF)
[MAIN BOARD]
(Side A)
TJ303
TJ305
R306
C624
R616
L602
X601 C618
R615 C633
R613 C609
C608 C607
R612
IC601
C613
C605
TJ601 C604
C612
(RF)
Procedure:
1. Connect the oscilloscope to the test point TJ601(RF) on the
MAIN board.
2. Set a disc. (YEDS-18)
3. Press the u button.
4. Check the oscilloscope waveform is as shown below.
A good eye pattern means that the diamond shape (◊) in the cen-
ter of the waveform can be clearly distinguished.
RF Signal reference Waveform (Eye Pattern)
VOLT/DIV : 100 mV (With the 10 : 1 probe in use)
TIME/DIV : 500ns
To watch the eye pattern, set the oscilloscope to AC range and
increase the vertical sensitivity of the oscilloscope for easy
watch-ing.
5. Stop revolving of the disc motor by pressing the x button.
TJ401(A GND)
A A
D306
D
C810
TAP1
VDR305
VDR302
TJ3
TJ307
FL2
TJ605
TJ802
TJ606
TJ5
TJ410
(A GND)
L606
TJ801
TJ608
TJ611
TJ10
C606
TJ614
RF level
0.45 to 0.75 Vp-p
D3