Read Sony ZS-PE40CP (serv.man2) Service Manual online
ZS-PE40CP
21
SECTION 4
ELECTRICAL CHECKS
TUNER SECTION 0 dB = 1 V
[AM]
Setting:
Function: RADIO
Band: 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.
JACK board
i
jack (J301)
unit
+
í
í
level meter
32
:
[FM]
Setting:
Function: RADIO
Band: FM
Setting:
Function: RADIO
Band: FM
FM RF signal
generator
75 kHz frequency
deviation by
1 kHz signal
Output level:
as low as possible
JACK board
i
jack (J301)
unit
0.01
PF
+
í
í
level meter
MAIN board
FM test point (Not print)
(GND)
32
:
MAIN board
TP2
Note: Perform FM frequency coverage check after removing FM tele-
scopic antenna (ANT1).
AM FREQUENCY COVERAGE CHECK
Check that reading on level meter is the maximum
Confi rmation
531 kHz
Confi rmation
1,602 kHz
FM FREQUENCY COVERAGE CHECK
Check that reading on level meter is the maximum
Confi rmation
87.5 MHz
Confi rmation
108 MHz
Connection Location:
– MAIN Board (Conductor Side) –
FM Test Point (Not print) (GND)
TP2
IC1
C6
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-
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 specifi ed value with the following checks.
5. Check the focus bias check when optical pick-up block is replaced.
FOCUS BIAS CHECK
+
–
–
CD board
test point (RFOUT)
test point (VC)
oscilloscope
Procedure:
1. Connect the oscilloscope to test point (RFOUT) and test point
1. Connect the oscilloscope to test point (RFOUT) and test point
(VC) on the CD 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 [
4. Set the disc (YEDS-18) and press the [
u
] button to playback.
5. Confi 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:
– CD Board (Side A) –
VC
RFOUT
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