Sony 757MX Service Manual - Page 18

Cdx-757mx, Electrical, Check - cdx power cable

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CDX-757MX SECTION 5 ELECTRICAL CHECK Note: 1. This check is performed with the set placed horizontally. 2. Power supply voltage: DC14.4 V (more than 3 A). 3. Be sure to use the disc "YEDS-18" parts code: 3-702-101-01, but only when indicated. 4. Use a master unit that supports SONY bus system. FOCUS BIAS CHECK Connection: - RF Board (Component Side) - Connection: power supply (DC 14.4 V) + GND master unit oscilloscope (AC range) BUS cable + - TP (VC) IC101 TP (RFAC) compact disc changer CONTROL connector (CN901) Procedure: 1. Connect the oscilloscope to TP (RFAC) and TP (VC) on the RF board. 2. Put the set into play mode by loading the disc (YEDS-18). 3. Confirm that oscilloscope waveform is clear and check RF sig- nal level is correct or not. Note: Clear RF signal waveform means that the shape "◊" can be clearly distinguished at the center of the waveform. RF signal waveform VOLT/DIV: 200 mV TIME/DIV: 500 ns (10 : 1 probe in use) level: 1.4 ± 0.3 Vp-p When observing the eye pattern, set the oscilloscope to AC range and raise the vertical sensitivity so that it may be easily seen. 18

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18
CDX-757MX
SECTION
5
ELECTRICAL
CHECK
Note:
1.
This check is performed with the set placed horizontally.
2.
Power supply voltage: DC14.4 V (more than 3 A).
3.
Be sure to use the disc “YEDS-18” parts code: 3-702-101-01, but only
when indicated.
4.
Use a master unit that supports SONY bus system.
Connection:
FOCUS
BIAS
CHECK
Connection:
– RF Board (Component Side) –
Procedure:
1.
Connect the oscilloscope to TP (RFAC) and TP (VC) on the
RF board.
2.
Put the set into play mode by loading the disc (YEDS-18).
3.
Confirm that oscilloscope waveform is clear and check RF sig-
nal level is correct or not.
Note:
Clear RF signal waveform means that the shape “
◊
” can be clearly distin-
guished at the center of the waveform.
When observing the eye pattern, set the oscilloscope to AC range
and raise the vertical sensitivity so that it may be easily seen.
GND
+
BUS cable
compact disc changer
master unit
CONTROL connector
(CN901)
power supply
(DC 14.4 V)
RF signal waveform
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
(10 : 1 probe in use)
level: 1.4
±
0.3 Vp-p
oscilloscope
(AC range)
+
–
TP (VC)
TP (RFAC)
IC101