NAD M55 Service Manual page 15

SECTION 3
ELECTRICAL
C ONTENTS
ELECTRICAL TROUBLESHOOTING GUIDE
............................................3-3
1. Power check flow....................................................................................3-3
2. System operation flow..............................................................................3-4
3. Test & debug flow....................................................................................3-5
DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGING
..........3-11
1. System 27MHz clock,reset,flash R/W signal.................................................3-11
2. SDRAM clock.........................................................................................3-12
3. TRAY OPEN/CLOSE signal.......................................................................3-12
4. SLED control related signal(NO disc control)................................................3-13
5. LENS control related signal(NO disc control)................................................3-14
6. FOCUS control related signal(NO disc control).............................................3-15
7. SPINDLE control WAVEFORM..................................................................3-16
8. FOCUS ON WAVEFORM..........................................................................3-17
9. ES6168F Audio optical and coaxialoutput(SPDIF)..........................................3-18
10. ES6168F Video output to Audio DAC..........................................................3-18
11. RF WAVEFORM.....................................................................................3-20
12. HDMI....................................................................................................3-20
13. MT1389 Audio output to Audio DAC............................................................3-22
14. Audio output(1KHz odB)...........................................................................3-22
BLOCK DIAGRAMS
..................................................................................3-23
1. Overall block diagram..............................................................................3-23
2. Power(SMPS) block diagram.....................................................................3-24
3. SERVO block diagram..............................................................................3-25
4. MPEG & MEMORY block diagram..............................................................3-26
5. Video & Audio block diagram.....................................................................3-27
6. GENESIS.SCART & DVI block diagram.......................................................3-28
CIRCUIT DIAGRAMS
...............................................................................3-29
1. Power(SMPS) circuit diagram...................................................................3-29
2. SYSTEM circuit diagram..........................................................................3-30
3. DSP circuit diagram................................................................................3-32
4. H-Power Driver circuit diagram..................................................................3-34
5. RF circuit diagram..................................................................................3-35
6. DSD circuit diagram................................................................................3-36
7. Audio circuit diagram...............................................................................3-38
8. Connect circuit diagram...........................................................................3-40
9. Timer circuit diagram...............................................................................3-41
10. RS232 circuit diagram..............................................................................3-42
11. SCART circuit diagram.............................................................................3-43
3-1