HCD-E300HD, NAS-E300HD - Sony Audio Service Manual (repair manual). Page 16

Note:
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 10 M

Ω 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.

Procedure:
1.  Connect an oscilloscope TP216 (RFACO) and TP5 (VC) on 

the CD board.

2.  Turn the power ON.
3.  Load a disc (YEDS-18) and playback.
4. Confi rm that oscilloscope waveform is clear and check if RF 

signal level is correct or not.

Note:  Clear RF signal waveform means that the shape “ ◊ ” can be clearly 

distinguished at the center of the waveform.

Procedure:
1.  Connect an oscilloscope to TP3 (TEI) and TP5 (VC).
2.  Turn the power ON.
3.  Load a disc (YEDS-18) and playback the number 5 track.
4. Confi rm that the level B and A (DC voltage) on the oscillo-

scope waveform.

Connecting and Adjustment Location: CD board

Procedure:
1.  Turn on the set.
2.  Input the following signal from signal generator to FM antenna 

input directly.

Carrier frequency : A = 87.5 MHz, B = 98 MHz, C = 108 MHz
Deviation 

: 75 kHz

Modulation 

: 1 kHz

ANT input 

: 35 dBu (EMF)

Note: Use 75 ohm coaxial cable to connect signal generator and the set. 

You cannot use video cable for checking.

 

  Use signal generator whose output impedance is 75 ohm.

 
3.  Set to FM tuner function and tune A, B and C signals.
4. Confi rm “TUNED” is lit on the display for A, B and C sig-

nals.

 
When the selected station signal is received in good condition, 
“TUNED” is displayed.