Rf Pattern Testing - NAD C 521i Service Manual

Nad c 521i compact disc player service manual

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RF PATTERN TESTING

TESTING PROCEDURE

(1) Load the test disc (Sony Test CD YEDS-7) and set the unit into PLAY mode.

(2) Connect the scope to R227 (Pin 15 of U101) and DGND (J144).

Scope setting:

(3) Observe the waveform is 2.0V p-p +/-5% and the eye pattern is at its best shape (see FIG. 1).

FIG. 1 (a)

3T 4T 5T — 11T

NAD - C 521i PCB TESTING POINTS DIAGRAM

Coupling

Vertical sensitivity

Horizontal time base

Testing

Point

: AC.

: 0.2 V/ div.

: 0.5 µS/div.

FIG. 1 (b) Poor eye pattern

FIG. 1 (C) Good eye pattern

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