Electrical Adjustments - Sony D-FS601 Service Manual

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 : Minimum
AVLS : OFF
HOLD switch : OFF
[MAIN BOARD] (Side A)
TAP802 (OPEN)
SECTION 4

ELECTRICAL ADJUSTMENTS

(J401)
Focus bias Check
Condition:
• Hold the set in horizontal state.
• Terminate TAP802 (open) by solder.
Connection:
Oscilloscope
(AC range)
2 K Ω
[MAIN BOARD] (Side B)
Procedure:
1. Connect the oscilloscope to the test points TJ629 (RF) on the
MAIN board.
2. Set a disc. (YEDS-18)
3. Press the B/> button.
4. Check the oscilloscope waveform is as shown below.
A good eye pattern means that the diamond shape (◊) in the
center 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
watching.
5. Stop revolving of the disc motor by pressing the x button.
D-FS601
TJ629 (RF)
IC601
IC302
IC801
RF level
0.4 to 0.5 Vp-p
9