Accuphase E-550 - MOTHER BOARD ASSY (716-0729-00); Mother Board Assembly Schematic Diagram; RECEIVER ASSY (721-0082-00); Receiver Assembly Schematic Diagram

/Comp
/ToneComp
/Tone
+12VD
Min_L
Bass_L
Treble_L
Max_L
IN
AGND
AGND
+15V
-15V
/COMP
/TONE,COMP
/TONE
+12V
AGND
Min
Bass
Treble
Max
Phone Out
DGND
+5V
PREOUT
/IoutR
AGND
IN
AGND
AGND
+15V
-15V
/COMP
/TONE,COMP
/TONE
+12V
AGND
Min
Bass
Treble
Max
Phone Out
DGND
+5V
PREOUT
/IoutL
AGND
VCC
AGND
+15VA
-15VA
/IoutL
Unb_L
Cur_L-
/Comp
/ToneComp
/Tone
+12VD
Min_R
Bass_R
Treble_R
Max_R
VCC
AGND
+15VA
-15VA
/IoutR
Unb_R
Cur_R-
1
2
3
4
5
K17
309-1075-04
1
4
6
8
16
13
11
9
RELAY1
362-1212-00
D10
MA165
+12VD
1
2
3
4
5
K18
309-1075-04
/OP2 /OP1
/Bal /CD Tuner /Line1 /Line2 M1/M2 /1to2 /2to1 /RecOff Mon/Src /Mono
/Comp
/ToneComp
/Tone IoutL IoutR
/IoutR
IoutR
/OP2 /OP1 /Bal CDB/LB
/CD Tuner /Line1
/Line2
M1/M2 /PreUnb
/ExtUnb
/1to2 /2to1 /RecOff
Mon/Src /Mono
+15VA
-15VA
Input_L Input_R
1 2 3 4
K14
309-3461-04
+12VD
+5VA
+12VD
Phone_L Phone_R
Phone_L Phone_R VR- VR+ VRVCC VRCNTS VRGND
VR- VR+ Buf_R Buf_L /LATATR /LATATL VRVCC VRGND VRCNTS EN_IO ATNDATA /AD_OP SCLK LAT_IO /ATNCLK SDATA
+15VA
-15VA
VCC
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
K7
307-2501-00
AGND
+15VA
-15VA
IN
AGND
AGND
AGND
+15V
-15V
VIOUT
ZERO
EN IO
/LAT
ACLK
DATA
SO
+5V
DGND
NC
NC
NC
NC
NC
Input_R
AGND
+15VA
-15VA
Cur_R-
Buf_R
VCC
IN
AGND
AGND
AGND
+15V
-15V
VIOUT
ZERO
EN IO
/LAT
ACLK
DATA
SO
+5V
DGND
NC
NC
NC
NC
NC
Input_L
AGND
+15VA
-15VA
Cur_L-
Buf_L
VCC
ACLK
/LATL
EN_IO
ATNDATA
ACLK
/LATR
EN_IO
98
IC8D
TC74HC14AP
/SP_A /SP_B /EN_Meter
GND
1
VDD
20
/EN
2
/RST
19
/LAT
3
CLK
18
SO
4
SIN
17
/O8
10
/O1
11
/O7
9
/O2
12
/O6
8
/O3
13
/O5
7
/O4
14
PGD
5
CM2
6
PGD
16
CM1
15
IC6
TD62C851P
9
10
8
IC9C
4
5
6
IC9B
10k
R8
10kR9
220p
C22
/LATR
/LATATR
/ATNCLK
12
IC8A
TC74HC14AP
ACLK
1312
IC8F
TC74HC14AP
/ACLK
/ACLK
/IoutL
IoutL
1110
IC8E
TC74HC14AP
12
13
11
IC9D
TC74HC132AP
1
2
3
IC9A
10kR7
220p
C21
/LATL
/LATATL
56
IC8C
TC74HC14AP
34
IC8B
TC74HC14AP
LATL
/EN EN_IO
100n
C19
VCC
100n
C20
VCC
LATL
/EN
/HPhone
/HPhone
100n
C17
VCC
D8 MA165 D9 MA165/Comp
/Tone
10k
R10
VCC VCC
IoutL IoutR
GND
1
VDD
20
/EN
2
/RST
19
/LAT
3
CLK
18
SO
4
SIN
17
/O8
10
/O1
11
/O7
9
/O2
12
/O6
8
/O3
13
/O5
7
/O4
14
PGD
5
CM2
6
PGD
16
CM1
15
IC5
TD62C851P
100n
C16
VCC
GND
1
VDD
20
/EN
2
/RST
19
/LAT
3
CLK
18
SO
4
SIN
17
/O8
10
/O1
11
/O7
9
/O2
12
/O6
8
/O3
13
/O5
7
/O4
14
PGD
5
CM2
6
PGD
16
CM1
15
IC7
TD62C851P
100n
C18
VCC
SCLKLAT_IO SDATA SCLKLAT_IO
/EN /EN
EN_Meter
from IO Relay (K3)
to IO Relay (K2)
to Balance Input (K2)
AGND
Unb_L Unb_R
+12VD
VCC
100n
C11
+5VA
100u
25V
C14
2200u
25V
C5
2200u
25V
C4
I
G
O
IC3
NJM78M15FA
I
G
O
IC2
NJM79M15FA
100n
C10
100n
C9
AC18V_1
AC18V_2
AC18V_CT
47u 35V
C6
D6
HZ153L
3.3k
R1
100R2
4700u
25V
C2
4700u
10V
C3
22u
16V
C15
30k
R4
30k
R3
4.7k
R5
I
G
O
IC1
UPC24M05AHF
470u
16V
C7
100n
C8
AC6V_1
AC6V_2
AC6V_CT
D3
D2SBA60
1
2
3
4
5
6
K3
308-0610-00
AC18V_1
AC18V_2
AC18V_CT
AC6V_1
AC6V_2
AC6V_CT
AC6V_CT
/SP_A /SP_B EN_Meter
1 2 3 4 5 6
K1
309-2673-04
to Protection (K4)
Meter_Com Meter_R Meter_L
Meter_Com Meter_L Meter_Com Meter_R
1 2
K2
308-0206-00
1 2
K16
308-0206-00
+15VA
-15VA
+12VD
CDB/LB /PreUnb /ExtUnb
MC/MM
MC/MM
1
2
3
4
5
6
7
8
9
10
K9
308-1026-00
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
K5
308-2006-00
1
2
3
4
5
6
7
8
9
10
K10
308-1026-00
1
2
3
4
5
6
7
8
9
10
K11
308-1026-00
1
2
3
4
5
6
7
8
9
10
K12
308-1026-00
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
K6
308-2006-00
220u
16V
C13
220u
16V
C12
to Lch Meter to Rch Meter
from Power Trans
to Switch (K4 6-10P)
to Switch (K4 1-5P)
to Headphone (K2)
to Volume (K1)
to Logic (K4)
to Connector Board (K1)
AC6V_1 AC6V_2
UnbGND
UnbGND
UnbGND
CRGND
CRGND
CRGND
CLGND
CLGND
CLGND
ILGND IRGND
ILGNDIRGND
1 2 3 4 5 6 7 8 9
10 11 12
K4
308-1206-00
HPGND
1 2 3 4 5 6 7 8
K13
308-0805-00
HPGND
X1
RN2204
VCC
D7
MA165
D11
MA165
/AD_OP
1 2 3 4 5 6 7 8 9 10
K15
308-1010-00
1 2
F1 310-8152-00
1 2
F3 310-8152-00
Q1
2SC4685_
D5
11EQS10
D4
11EQS10
D2
D1
1 2
F4 310-8202-00
1 2
F2 310-8202-00
AC6V_CT
I
G
O
IC4
UPC24M05AHF
1 2 3 4 5 6 7 8 9
10 11 12
K8
309-1232-04
4700u
10V
C1
AGND
1k
R6
to VI (K1)
to VI (K1)
to VI (K2)
to VI (K2)
to IV (K1)
to IV (K2)
-
2
6
-
M O T H E R B O R D A S S ' Y ( 7 1 6 - 0 7 2 9 - 0 0 )