Onkyo HT-RC270(B) Service Manual page 38

A B
SCHEMATIC DIAGRAMS-34
WAVEFORM SECTION
Digital Audio Waveform Part (SD-15)
1
NOTE:
1. WF01 is short for Waveform01 .
2. Refer to SCHEMATIC DIAGRAM-3 / PART-5
for the location of each waveform in the circuit.
3. XY in "PART-b:XY" indicates each measurement
point location, X=A to E/H/K, Y=1 to 4/5/8.
WF02
WF01 OPT1
2
4.0V
Duty varies according to audio data
WF05
WF04 LRCKDIR HDMI
3.3V
3
WF08
WF07
DSP LRCK3
3.3V
4
WF10 DAC_FL WF10
2.8V
0V
Analog audio waveform with aliasing noise Aliasing noise in no audio data
5
C
LR CLOCK (SAI_LRCK, CX_LRCK)
Fs=48kHz : DVD, Clock width=20.8us
Fs=44.1kHz : CD, Clock width=22.7us
BIT CLOCK (SAI_SLCK, CX_SLCK)
64Fs=3072kHz : DVD, Clock width=325ns
64Fs=2822.4kHz : CD, Clock width=354ns
COAX1 WF03 SDOUTDIR HDMIFLR
5.0V 3.3V
Duty always varies according to audio data Duty varies according to audio data
BCKDIR HDMI WF06 DSP FLR3
3.3V
Front L/R audio data
DSP BCK3 WF09 FL+
2.8V
3.3V
0V
Analog audio waveform with aliasing noise
DAC_FL
220mVp-p
D E
Video source color and pattern
White Cyan Magenta Blue
Yellow Green Red
NOTE:
1.
WF21 is short for Waveform21 .
2. Refer to SCHEMATIC DIAGRAM-4/PART-6
for the location of each waveform on circuit.
3. XY in "PART-x:XY" indicates each socket's
location, X=A to E/H/K, Y=1 to 4/5/8.
4. In the case that video outputs are not
connected to video devices, video signal
output levels are doubled.
HDMI Waveform Part (SD16)
HDMI D0,D1,D2 waveform
3.3V
WF41 PART-11:B3, H4
360mV
2,227.5MHz
(1080p,12bit)
600mV
27MHz
(480i, 8bit)
D0,D1,D2 Eye-pattern waveform, frequency and
level vary according to video resolution, aspect
and profile. Waveforms above are examples.
HDMI CK waveform
WF42 PART-11:B3, H4
222,75MHz
(1080p,12bit)
CK waveform, frequency and level differ according to
video resolution, aspect and profile.
D0,D1,D2 are just CK x10.
TX-NR708/808/1008, TX-NA708/808/1008, HT-RC270, DTR-40.2/50.2, DHC-40.2
F G
Video Waveform Part (SD12)
Composite waveform S-Video Y waveform
WF21 WF22
1V 1V
6.36 s u
(NTSC)
1.2 Vp-p (H)
1.0 Vp-p
Component Y waveform Component PB waveform
WF24 WF25
1V
1.0 Vp-p 720 mVp-p
FL Driver IC Control Waveform Part (SD25,26,28,30)
SCK/SDATA waveform
WF61 PART-9:F4/D4
5V
SCK
0V
2ms
12ms
5V
SDATA
0V
SCK/CS waveform
WF62 PART-9:F4/D4
5V
SCK
0V
2ms
12ms
5V
CS
0V
SCK/RESET waveform
WF63 PART-9:F4/D4
5V
SCK
0V
0.45s
5V
RESET
0V
When power on
H
S-Video C waveform
WF23
280 mVp-p
Component PR waveform
WF26
728 mVp-p
SCK/SDATA waveform
WF61 PART-9:F4/D4
5V
SCK
0V
10 s u
5V
SDATA
0V
SDATA waveform varies according to
the data content
SCK/RESET waveform
WF63 PART-9:F4/D4
5V
SCK
0V
0.6s
5V
RESET
0V
When power off