9
RF PATTERN TESTING
Testing
Point
NAD - C 521i PCB TESTING POINTS DIAGRAM
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:
Coupling
: AC.
Vertical sensitivity
: 0.2 V/ div.
Horizontal time base
: 0.5 µS/div.
(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)
FIG. 1 (b) Poor eye pattern
FIG. 1 (C) Good eye pattern
3T 4T 5T — 11T
Summary of Contents for C521i
Page 1: ...NAD C 521i COMPACT DISC PLAYER C 521iCOMPACT DISC PLAYER SERVICE MANUAL...
Page 12: ...12 PCB LAYOUT DISPLAY BOARD KEY BOARD LIVE BOARD LED BOARD...
Page 13: ...14 13 MAIN BOARD...
Page 30: ...34 EXPLODED VIEW...
Page 33: ...SERVICE MANUAL NAD 2002 C 521i COMPACT DISC PLAYER NAD ELECTRONICS INTERNATIONAL TORONTO...
