Table of Contents
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BALANCED INPUT
FILTER
C53
V+
25V 100n
C40
LREF
V-
TO PIN 4 OF MC33078
25V 100n
D30
R111
82K5
C66
4148
LEFT CHAN
47K
R87
220p
LREF
1K54
9K760
9K760
C41
C42
JB5
16v
33n
16v
33n
R90
R95
R94
R113
2
C64
MC33078
LIN_XLR
3
4M7
1/2
1
220p
C61
C60
NUTRIX
3
U6
16v 330n
16v 330n
1
2
R112
C63
LREF
C65
220K
LREF
220p
220p
R92
9K760
9K760
JB3 1
3
5
1K54
R91
R93
TP7
LIN_PH
S
R
T
NO_GOLD
2
4
6
S3
L
M
R
MONO-STEREO-BRIDGE
COM
1
2
3
4
S3
STEREO,MONO: RSIG = RSPOST
L
M
R
COM
13
14
15
16
BRIDGED: RSIG =
10R
S3
R83
(4=V-,8=V+)
L
M
R
COM
LPOST
5
6
7
8
10R
R86
C36
RIGHT CHAN
RREF
V-
TO PIN 4 OF MC33078
25V 100n
C39
V+
25V 100n
D29
NO_GOLD
2
4
6
4148
S
R
T
C70
RIN_PH
R88
82K5
220p
47K
R100
JB4 1
3
5
RREF
1K54
9K760
9K760
C43
C44
16v
33n
16v
33n
R102
R108
R106
R110
MC33078
C68
JB6
RREF
1/2
220p
C59
C62
3
U7
2
16v 330n
16v 330n
1
RIN_XLR
3
1
2
R109
NUTRIX
RREF
220K
C67
C69
220p
220p
R104
9K760
9K760
1K54
R103
R105
TP3
V+
GND_LIFT
SW3
SW3
X3
LREF
C51
1
4
25V
OUT
OUT
100n
2
5
RREF AND LREF CONNECT TO
IN
IN
3
6
CHASSIS
LVGND AT THE INPUT JACKS
C71
22n
C52
25V
X4
RREF
100n
V-
WC8
LVGND
M1088.SCH_DATABASE_HISTORY
MODEL(S):-
AP-800
#
DATE
VER#
DESCRIPTION OF CHANGE
1
MAY/30/95
1.10
PC#4806__R126R/R130R__47R-->75R
2
JUN/21/95
1.20
DC_VOLTAGES_ADDED_TO_SCHEMATIC
3
JUN/26/95
2.00
PC#4848_R50L/R_R46L/R_158R-->475R
4
.
.
C29L/R_C30L/R__47N-->10N--ADD_4148
5
.
.
DIODE_IN_SERIES_WITH_D11L/R_AND
6
.
.
D16L/R_ADD_475R_FROM_EMITTER_Q14,
7
.
.
Q21_TO_THE_BASE_OF_Q8_ALSO_FOR_Q15,
8
.
.
Q23_TO_THE_BASE_OF_Q9
9
AUG/14/96
2.10
PC#5189_C65,C66,C69,C70_27P-->220P
10
D
V
N
V+
LCLP
6
TP1
7
C58
V+
5
U6
16V
33u
M1090
1/2
MC33078P
(4=V-,8=V+)
LVGND
VOLUME CONTROL
LVGND
V-
BOARD
IN
OUT
V-
FILTER SWITCH
LSPRE
-1dB 6Hz
-1dB 40Hz
V+
LIMITER
CABLE HEADER
12Db/Oct
LREF
6
IN
U10
1
5
OUT
RSPRE
1
14
RREF
4
LSPRE
2
13
LREF
SW1
LIMABLE
R84
RSIG
3
12
LSPOST
33K
RSPOST
4
11
V-
LIMABLE
5
10
V+
RSIG
RREF
LCLP
6
9
LVGND
LSPOST
RCLP
7
8
FET_CNTL
RSPOST
MC33078P
FOURTEEN
LSPOST
1/2
5
U8
CONDUCTOR
7
LREF
TP6
RSPRE
6
RIBBON
10K0
10K0
R99
R98
CABLE
C56
RREF
16V
33u
6
FET_CNTL
7
5
U7
1/2
MC33078P
(4=V-,8=V+)
AMPLIFIER SHUTDOWN CIRCUIT
IN
16v
4M7
500mW
D28
OUT
D34
R101
R89
FILTER SWITCH
1M
390K
D5
-1dB 6Hz
(4=V-,8=V+)
+16V
MC33078P
-1dB 40Hz
V+
1/2
3
U8
12Db/Oct
R85
1
-15V
2
1M
100n
R77
25V
33K
C50
LVGND
PIN 1
MC1
WC9
FET_CNTL
1
2
KILL
RGT_THRM
3
LFT_THRM
4
5
TO
6
LVGND
7
V+
8
M1091
V-
R120
10K
LVGND
V+
V-
LOG
ISOTHERMAL TO LEFT HEATSINK
11
12
13
14
15
16
2.50
PC#6609_C54R/C55R_220u->330u
17
18
19
20
21
22
23
24
25
TO PIN 8
LCLP
TO LEFT
OF U1R
CHAN AMP
R23L
R24L
LSPOST
V+
82K5
82K5
C73L
LREF
27p
LOG
R31L
R96L
MC33078
2K
Q29L
2N5638
1/2
100K
-16V
V-
C72L
3
U1L
R134L
16V
1
LOG
2
33u
TO PIN 4
33n
R135L
OF U1R
ROG
25V
CLIP
10R
10R
C49L
C74L
SENSE
D49R
27p
4148
LOG
OPTOLED
D47R
6
1
R26L
R27L
4148
5
2
82K5
82K5
R79R
D45R
4
4N35
1K5
4148
LREF
U4R
U4R
D46R
4148
LVGND
RCLP
R32R
R33R
37K90
3K160
R23R
R24R
RSIG
MC33078
R28R
82K5
82K5
1/2
R29R
1K0_1%
3
C73R
U2AR
1
1K
27p
2
ROG
C19R
C20R
MC33078
15n
100p
R96R
Q29R
33u
1/2
2N5638
100K
5
U1R
MC33078
16V
7
R134R
1/2
R30R
C72R
6
5
U2BR
33n
R31R
7
47R
R135R
25V
2K
6
C49R
10R
10R
C74R
MC33078
27p
ROG
1/2
R75R
ROG
3
U2BR
1
47R
R26R
R27R
2
82K5
82K5
MC33078
RREF
1/2
R74R
5
U2AR
7
47R
R36R
6
4K7
-19V
R34R
D43R
33U
16V
C17R
4K590
Q31R
BC550
ROG
WC3
VH+
VH+
VH+
D44R
R127R
Q30R
8K2
BC560
WC2R
PS_GND
X2
PS_GND
R128R
ROG
43K
WC2L
R35R
PS_GND
X1
PS_GND
324R0
LOG
WC1
C18R
VH-
180p
VH-
VH-
R119
10K
ROG
ISOTHERMAL TO RIGHT HEATSINK
MJL1302A
MJL21193
MJL3281A
MJL21194
BT139
BC550C
MPSA13
MPS4991
BC560C
MPSA63
C B E
E B C
B
C
E
B
C
E
D38R
1N4004
BAV21
TO PIN 8 OF U2R
R39R
D13R
+BAT
910R
+16V
4V7
1N750A
C48R
C45R
16V
16V
ZD9R
100n
100n
R41R
BYPASS CAPS
R49R
442R
6190
C47R
C46R
2%
16V
16V
ONLY!
100n
100n
-BAT
D54R
30V
TO PIN 4 OF U2R
500mW
D55R
AMPOUT
D36R
R82R
5K9
D11R
D12R
BAT85
7K5
+BAT
R131R
+16V
OPTOLED
R73R
D9R
8K25
Q34R
BAT85
BC560
1
BC550
R76R
-BAT
16V/1W
D50R
75R
2
47K
BZX79
+16V
R130R
D41R
Q33R
Q25R
U3R
Q8R
A13
C25R
BC550
25V
D51R
470u
R37R
2K32
R81R
R48R
AMPOUT
7V5
500mW
5K9
562R
D52R
C26R
25V
7V5
R107R
470u
500mW
R47R
R136R
Q24R
D53R
5K9
A63
562R
100K
R132R
D10R
16V/1W
7K5
BZX79
+BAT
Q9R
R78R
D40R
47K
BC560
+16V
6K19
R133R
Q32R
+BAT
-BAT
D42R
BC550
R126R
R71R
D27R
75R
8K25
R124R
D16R
2K43
D56R
100R
Q7R
D15R
RT1R
LIN
D57R
BAT85
BC550
4V7
R38R
IN5257A
475R
30V
ZD8R
500mW
R80R
D21R
ROG
R44R
D35R
5900
442R
BAV21
2%
LONG TERM CURRENT
ONLY!
LIMIT SENSING
R42R
V+
CIRCUIT
910R
R45R
6190
D39R
1N4004
+16V
6
6
100V
5
5
4
4
4N35
4N35
U3R
U3L
R114
R117
47K
47K
0V
D32
Q20
BC550
D33
C34
C35
R118
R116
16V
16V
2M2
2u2
2u2
2M2
R115
100K
LVGND
LVGND
YORKVILLE
NOTES:
NOTES:
NOTE:
ADJUST RT1R FOR
ALL UNMARKED DIODES ARE IN4148
V+ = ~+16VDC
10mV BETWEEN
TP2
V- = ~-16VDC
TEST POINT
TP4 @ TP5
ALL DC VOLTAGES MEASURED
WHILE AMP IS
LEFT = A CHANNEL
IN 4 OHM MODE
WITH REFERENCE TO GROUND
RIGHT = B CHANNEL
AT 120VAC
MEASURED @ 120VAC IN 4 OHM MODE
+71V
VH+
SPEAKER
OUTPUT
C55R
C37R
100V
100V
330u
100n
BINDING POSTS
ROG
SPEAKON
+33V
1
MR854
+
1
2
D19R
+1.1V
-
-
2
+
R129R
Q22R
3
B_OUT
1R
MJL3281A
R63R
+0.55V
SPEAKON
390R
Q12R
Q14R
Q21R
C29R
3
25V
10n
4
2
+
R50R
MJL21194
MJL21194
MJL21194
-
-
1
475R
2
ROG
+
R140R
WC4
1
475R
R137R
BRIDGE
ROG
475R
TP5R
R121R
R51R
R122R
0R1
0R1
0R1
R11R
R52R
R54R
R123R
L1R
33R
0R1
0R1
0R1
4uH
R138R
475R
TP4R
R139R
R57R
475R
5W
R46R
1R8
475R
-0.55V
C30R
Q13R
Q15R
Q23R
25V
C33R
10n
100V
R62R
47n
MJL21193
MJL21193
MJL21193
390R
MR854
R125R
Q10R
D20R
R70R
1R
MJL1302A
7R5
-1.1V
R69R
7R5
ROG
-33V
330u
C38R
-71V
100V
VH-
100n
C54R
Q18R
MAC15A6FP
ROG
R58R
R67R
G
33K
100R
Q19R
16v
MBS4991
C57R
DIAC
8V
10u
AP_800
DATE:
MAY/28/2003
MODELS:
SCH ISSUE:
-
_
NAME:
M1088.SCH
PCB#:
M1088
TITLE:
INPUT/PWR_AMP
NOTE:
LAST R = R140
LAST C = C74
LAST D = D57
LAST Q = Q34
LAST U = U10
LAST J = J109
+
-
JB2
4
JB1
WC5
LOG
LOG
A_OUT
A_OUT
WC6
B_OUT
MT2
MT1
ROG
2.50
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