Block Diagram - Pioneer A-70DA-K Service Manual

FRONT
POWER
+8V
Power SW STB LED
Sub Trans secandary DC
IC91 IC92
+3.3V
+5V Reg
Reg
SR I/O
FLASH
C C M6632
384kHz/32bit
DSD5.6M
COAX
DA model only
OPT
+7.5V
+18V +15V +15V
+15V Reg +8V Reg +5V Reg
-
-15V Reg 5V Reg
-8V Reg
DA model only
-18V -15V -7.5V
M M / MC
PHONO
PHONO
MC:A-70 only
for RECOUT&APD
Input
INPUT
LINE2 SELECTOR
(NJW1112)
NETWORK
SACD/CD
APD
(NJU7181)
LINE1
P-AMP
DIRECT
LINE2 OUT
Balance support e support E.Volume
1 2 1 2
BALANCE
(NJW1195)
3 3
+11dB
Bu ffer
Phase switching
XLR
A-70DA/A-70A only
Vol
Tone Balance SW
IR
MAIN
µ COM
PCM/DSD
+6V +6V
+3.3V
+6V TR DAC
Reg
384kHz/32bit
+3.3V
ES9016
+1.2V
Reg
LPF
DA model only
T ONE
&
LOUDNESS
2 c h RELAY h RELAY
P- P-AMP
E.Volume e +11dB
DIRECT
(NJW1194)
+3dB
3dB
BAL UNBAL
fo r HP
HP
Input Selecter
Blue LED
SMALL
SIGNAL
RELAY
HPAMP
+3.3V
Reg
BAL/UNBAL
POWER AMP GAIN
DAMP SUB
2 c h RELAY h RELAY
2 c h RELAY h RELAY *2
Differential
Bufffer
BAL/UNBAL
Gate
PWM
0dB 0dB
Driver
signal : inversion
GND : inversion
+35V
12V Reg
-35V
+20V +15V
IC4908 IC7251
23dB
+15V
+12V
Reg Reg
+35V
-15V
-12V
Reg Reg
IC4909 IC7252
-20V -15V
LPF
RELAY RELAY
RELAY RELAY
DAMP MAIN
-35V