Electrical Adjustments - Sony XP-ZR810 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
HOLD switch : OFF
Focus bias Check
Condition:
• Hold the set in horizontal state.
• Terminate SL825 (OPEN) by solder.
Connection:
Oscilloscope
(AC range)
2 K Ω
[MAIN BOARD] (Side B)
SL825(OPEN)
SECTION 4

ELECTRICAL ADJUSTMENTS

(J401)
TP601 (RF)
IC801
IC601
TP601(RF)
IC302
Procedure:
1. Connect the oscilloscope to the test point TP601 (RF) on the
MAIN board.
2. Set a disc. (YEDS-18)
3. Press the button.
u
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)
To watch the eye pattern, set the oscilloscope to AC range and
VOLT/DIV : 100 mV (With the 10 : 1 probe in use)
TIME/DIV : 500ns
increase the vertical sensitivity of the oscilloscope for easy
watching.
5. Stop revolving of the disc motor by pressing the x button.
XP-ZR810
RF level
0.4 to 0.7 Vp-p
11