Read Sony ZS-E5 (serv.man2) Service Manual online
ZS-E5
9
CD section adjustments are done automatically in this set.
In case of operation check, confi rm that focus bias.
In case of operation check, confi rm that focus bias.
FOCUS BIAS CHECK
Connection:
Connection:
Procedure:
1. Connect a oscilloscope to TP45 (RF) and TP42 (VREF) on the
1. Connect a oscilloscope to TP45 (RF) and TP42 (VREF) on the
MAIN board.
2. Insert the CD test disc (PATD-012). (Part No. 4-225-203-01)
3. Press the [
3. Press the [
u
] button.
4. Confi rm that the oscilloscope waveform is as shown in the fi g-
ure below. (eye pattern)
A good eye pattern means that the diamond shape (◊) in the-
center of the waveform can be clearly distinguished.
center of the waveform can be clearly distinguished.
RF Signal Reference Waveform (Eye Pattern)
Checking Location:
CD SECTION
+
–
–
MAIN board
TP45 (RF)
TP42 (VREF)
oscilloscope
(AC range)
VOLT/DIV: 0.2 V (with the 10: 1 probe in use.)
TIME/DIV: 500 ns
1.2
r0.6 Vp-p
When observing the eye pattern, set the oscilloscope
for AC range and raise vertical sensitivity.
– MAIN Board (Conductor Side) –
TP42
(VREF)
TP45
(RF)
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