Sony ZS-PS30CP, Руководство по обслуживанию

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ZS-PS30CP
18
SECTION 4
ELECTRICAL CHECKS
TUNER SECTION 0 dB = 1

V
[AM]
Setting:
Function: RADIO
Band: AM
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level:
as low as possible
Put the lead-wire
antenna close to
the unit.
HP JACK board
i
jack (J302)
unit
+
í
level meter
32
:
[FM]
Setting:
Function: RADIO
Band: FM
FM RF signal
generator
75 kHz frequency
deviation by
1 kHz signal
Output level:
as low as possible
HP JACK board
i
jack (J302)
unit
0.01
P
F
+
í
level meter
MAIN board
TP814 (GND)
32
:
MAIN board
JW101
Note: Perform FM frequency coverage check after removing FM tele-
scopic antenna (ANT1).
no mark: Chilean, Peruvian, Asian, Taiwan and Argentina models
( ): Panamanian model
AM FREQUENCY COVERAGE CHECK
Check that reading on level meter is the maximum
Con fi rmation 531 (530) kHz
Con fi rmation 1,602 (1,710) kHz
FM FREQUENCY COVERAGE CHECK
Check that reading on level meter is the maximum
Con fi rmation 87.5 MHz
Con fi rmation 108 MHz
CD SECTION
Note:
1. CD block is basically constructed to operate without adjustment.
2. Use YEDS-18 disc (Part No. 3-702-101-01) unless otherwise indicat-
ed.
3. Use an oscilloscope with more than 10 M

impedance.
4. Clean the object lens by an applicator with neutral detergent when the
signal level is low than speci fi ed value with the following checks.
5. Check the focus bias check when optical pick-up block is replaced.
FOCUS BIAS CHECK
+
–
MAIN board
TP804 (RF)
TP711 (VREF)
oscilloscope
Procedure:
1. Connect the oscilloscope to TP804 (RF) and TP711 (VREF)
on the MAIN board.
2. In the standby state, press the [POWER] button to turn the
power on.
3. Press the [CD] button to turn the CD function.
4. Set the disc (YEDS-18) and press the [
u
] button to playback.
5. Con fi rm that oscilloscope waveform is as shown in the fi gure
below. (eye pattern)
A good eye pattern means that the diamond shape (

) in the
center of the waveform can be clearly distinguished.
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level: 1.5 Vp-p
Connection Location:
– MAIN Board (Conductor Side) –
TP814
(GND)
TP804
(RF)
TP711
(VREF)
JW101
Ver. 1.1