Sony service manual Section Electrical Adjustments HCD-C5, CD Section, RF Level Check

SECTION 5

ELECTRICAL ADJUSTMENTS

HCD-C5

CD SECTION

Note 1:

1.CD Block is basically designed to operate without adjustment. There- fore, check each item in order given.

2.Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.

3. Use an oscilloscope with more than 10MΩ impedance.

4.Clean the object lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks.

Note 2:

Checking Location:

– BD (CD) BOARD –

IC103

As the laser diode in the optical pick-up (OPTIMA-720L1E) is easily damaged by static electricity, solder the laser tap of the flexible board when handling it. Before disconnecting the connector, solder first. Before connecting the connector, be careful not to remove the solder. Also take adequate measures to prevent damage by static electricity. Handle the flexible board with care as it breaks easily.

TP (RFAC)

pick-up

IC101TP (DVC 1.65V)

laser tap

frexible board

RF Level Check

Connection:

oscilloscope

(AC range)

BD (CD) board
TP (RFAC)	+
TP (DVC 1.65V)	–

Procedure:

1.Connect an oscilloscope to test point TP (RFAC) and TP (DVC 1.65V) on the BD (CD) board.

2.Turn the power on.

3.Put the disc (YEDS-18) in to playback the number five track.

4.Confirm that oscilloscope waveform is clear and check RF sig- nal level is correct or not.

Note: A 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

level: 1.1 ± 0.3 Vp-p

Checking Location: BD (CD) board

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