SONY CMTNEZ5
Instrukcja Serwisowa

HCD-NEZ3/NEZ5

2. Turn the adjustment screw and check output peaks. If the peaks do not match for L-CH and R-CH, turn the adjustment screw so that outputs match within 1dB of peak.

CD SECTION
Note: 1. 2. 3. 4. CD Block is basically constructed to operate without adjustment. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated. Use an oscilloscope with more than 10 M� impedance. Clean the object lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks.

L-CH peak Output level R-CH peak

within 1dB within 1dB

5. Check the focus bias check when optical block is replaced.

FOCUS BIAS CHECK
oscilloscope (DC range)
L-CH peak R-CH peak Screw position

Screw position

CD board TP (RFACO) TP (VC)
+ �

3. Mode: Playback
test tape HEAD PHONE board P-4-A063 PHONES jack oscilloscope (6.3 kHz, �10 dB) (J500)

Procedure : 1. Connect the oscilloscope to TP (RFACO) and TP (VC) on the CD board. 2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01) 3. Press the
CD u

button.

V set

H

4. Confirm that the oscilloscope waveform is as shown in the figure below. (eye pattern) A good eye pattern means that the diamond shape (�) in the center of the waveform can be clearly distinguished. � RF signal reference waveform (eye pattern)

waveform of oscilloscope

VOLT/DIV: 0.2 V (with the 10: 1 probe in use.) TIME/DIV: 500 ns

in phase 45° good

90° 135° 180° wrong
1.1 0.2 Vp-p

4. After the adjustments, apply suitable locking compound to the pats adjusted. Adjustment Location: Record/Playback/Erase Head

When observing the eye pattern, set the oscilloscope for AC range and raise vertical sensitivity.

Checking Location: � CD BOARD (Conductor Side) �

TP (VC)

TP (RFACO)

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