NAD T517AHT Service Manual
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Contents
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3-1SECTION 3ELECTRICALCONTENTSELECTRICAL TROUBLESHOOTING GUIDE.....................................................................................3-21. SMPS TROUBLESHOOTING FLOW ......................................................................................................3-22. POWER CHECK FLOW ..........................................................................................................................3-43. SYSTEM OPERATION FLOW.................................................................................................................3-54. SYSTEM TEST FLOW ...........................................................................................................................3-6DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGIBG...................................3-121. SYSTEM 27MHZ CLOCK, RESET, FLASH R/W SIGNAL ....................................................................3-122. SDRAM CLOCK ...................................................................................................................................3-143. TRAY OPEN/CLOSE SIGNAL ...............................................................................................................3-144. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION)............................................................3-155. LENS CONTROL RELATED SIGNAL (NO DISC CONDITION) ..........................................................3-156. LASER POWER CONTROL RELATED SIGNAL (NO DISC CONDITION) ..........................................3-167. DISC TYPE JUDGEMENT WAVEFORM...............................................................................................3-168. FOCUS ON WAVEFORM ......................................................................................................................3-189. SPINDLE CONTROL WAVEFORM (NO DISC CONDITION) ...............................................................3-1910. TRACKING CONTROL RELATED SIGNAL (SYSTEM CHECKING) ....................................................3-2011. MT1389S AUDIO OPTICAL AND COAXIAL OUTPUT (SPDIF) ............................................................3-2112. MT1389S VIDEO OUTPUT WAVEFORM .............................................................................................3-2113. AUDIO OUTPUT FROM MT1389S........................................................................................................3-22CONNECTOR PICTURE ..........................................................................................................................3-231. ALL CONNECTOR PICTURE................................................................................................................3-232. MAIN BOARD CONNECTOR PICTURE ...............................................................................................3-243. CN201 CONNECTOR PICTURE...........................................................................................................3-254. CN202 CONNECTOR PICTURE...........................................................................................................3-255. CN601 CONNECTOR PICTURE...........................................................................................................3-266. CN602 CONNECTOR PICTURE...........................................................................................................3-267. CN604 CONNECTOR PICTURE...........................................................................................................3-278. CN605 CONNECTOR PICTURE...........................................................................................................3-279. CN705 CONNECTOR PICTURE...........................................................................................................3-28BLOCK DIAGRAMS ..................................................................................................................................3-291. OVERALL BLOCK DIAGRAM ...............................................................................................................3-292. POWER (SMPS) BLOCK DIAGRAM.....................................................................................................3-303. MPEG & MEMORY BLOCK DIAGRAM.................................................................................................3-314. SERVO BLOCK DIAGRAM ...................................................................................................................3-325. VIDEO & HDMI BLOCK DIAGRAM.......................................................................................................3-336. AUDIO BLOCK DIAGRAM.....................................................................................................................3-34CIRCUIT DIAGRAMS ................................................................................................................................3-351. POWER (SMPS) CIRCUIT DIAGRAM ..................................................................................................3-352. MPEG CIRCUIT DIAGRAM ...................................................................................................................3-373. SERVO CIRCUIT DIAGRAM .................................................................................................................3-394. JACK CIRCUIT DIAGRAM ....................................................................................................................3-415. SCART CIRCUIT DIAGRAM (OPTION) ................................................................................................3-436. USB CIRCUIT DIAGRAM ......................................................................................................................3-457. KEY CIRCUIT DIAGRAM ......................................................................................................................3-468. TIMER CIRCUIT DIAGRAM ..................................................................................................................3-47• CIRCUIT VOLTAGE CHART.........................................................................................................3-49PRINTED CIRCUIT BOARD DIAGRAMS...........................................................................................3-531. MAIN P.C.BOARD..................................................................................................................................3-532. POWER (SMPS) P.C.BOARD ...............................................................................................................3-553. KEY P.C.BOARD ...................................................................................................................................3-554. TIMER P.C.BOARD ...............................................................................................................................3-555. SCART P.C.BOARD (OPTION) .............................................................................................................3-576. USB P.C.BOARD ...................................................................................................................................3-57 |
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