Crest Audio PFA-600 Schematic
PFA600Poweramplifiers
1.Displayboard
2.Inputboard
3.Preamp
4.Powersupplydriver
5.Powersupplyboard
6.Relayboard
7.Voltagemonitor
8.Outputmodule
Schematicset
8
D D
7
R42
91/10W
6
5
4
3
2
J3
RELAY CH. B
1
RELAY CH. A
2
RELAY GROUND
3
RELAY GROUND
4
LED GROUND
5
ACTIVE CH. B
6
TEMP/DC CH. B
7
SIGNAL CH. B
8
CLIP CH. B
9
CLIP CH. A
10
SIGNAL CH. A
11
TEMP/DC CH. A
12
ACTIVE CH. A
13
26-48-1136
1
C3
7
LM614
IC1B
R9
2.7K
Z3
IC1E
R34
4.7K
1N5344
Z4
1N5344
Z5
1N5344
1N5927
R24
1K/1%
D18
1N4148
Z2
R32
390K
C6
100/25V
C5
Q3
Z1
1N5927
R21
1K
1K/1%
D19
1N4148
-
6
+
5
R31
390K
0.1/100V
R23
8
13
LM614
9
499/1%
R33
4.7K
R35
499/1%
R37
2.2K
R36
R10
2.7K
2N5551
Q4
R22
1K
-
15
+
14
IC1D
LM614
470/6.3V
D10
1N4148
16
R8
100K
D8
1N4148
C4
TR2
MAC97A
C7
100/25V
R12
5K/5W
C2
1/50V
2N5551
2.7K
R6
R4
1N4004
10K
D2
D4
1N4148
1N4148
D21
J2
+24V. OUT
1
SIGNAL CH. A
2
CLIP CH. A
3
CONTROL V. CH. A
4
LIMIT CH. A
5
MUTE CH. A
6
AMP OUT CH. A
7
TEMP SENSOR + CH. A
8
TEMP SENSOR OUT CH. A
9
TEMP SENSOR GND. CH.ATEMP SENSOR GND CH. B
10
GROUND
11
GROUND
12
GROUND
13
+24V. IN CH. A
14
+24V. IN CH. B
15
26-48-1156
Q2
D6
1N4148
R14
10K
D20
1N4004
D14
1N4148
1N4148
R20
7.5K
R18
2.7K
12
+
10
11
-
IC1C
LM614
R39 100K
R30
D16
10K
R26
47K
4.3K
R28
R16
2.7K
Q6
MPSA75
R44
15
D12
1N4148
R5
2.7K
R3
10K
Q1
2N5551
R7
100K
2N5551
C C
FAN +
26-48-1156
J1
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
A/B MUTE
SIGNAL CH. B
CLIP CH. B
CONTROL V. CH. B
LIMIT CH. B
MUTE CH. B
AMP OUT CH. B
TEMP SENSOR + CH. B
TEMP SENSOR OUT CH. B
GROUND
GROUND
GROUND
FAN GROUND
D3
1N4148
D5
1N4148D71N4148
C1
1/50V
D9
1N4148
R11
TR1
5K/5W
R13
10K
MAC97A
C8
100/25V
470/6.3V
D11
1N4148
D13
1N4148
B B
1
IC1A
LM614
R38
R25
100K
47K
2.7K
R17
2.7K
R15
MPSA75
Q5
R43
R27
4.3K
15
R19
7.5K
-
2
+
3
D15
1N4148
4 13
R29
10K
D17
1N4148
D22
1N4004
A A
D23
1N4004
CREST AUDIO INC.
150 Florence Ave.
Hawthorne, NJ 07506
Title
PFA600 DISPLAY/PROTECT DRIVER
Size Document Number Rev
21C1169
C
8
7
6
5
4
3
Date: Sheet of
2
1 0Tuesday, June 27, 2000
1
8
D D
7
6
5
4
3
2
1
J1
1
2
J3
3
4
5
6
7
8
PTC15XD 5KAP
VR1
PL08
VR2
C C
PTC15XD 5KAP
J2
17
16
15
14
13
12
11
10
9
8
7
6
1
2
3
4
5
5
4
3
2
1
6
26-48-1175
PL08
7
8
R1 680/10W
R2 680/10W
BAR1
B B
1
2
3
4
5
6
.25 LUG
72706-C-50-81
CREST AUDIO INC.
A A
150 Florence Ave.
Hawthorne, NJ 07506
Title
PFA600 INPUT PCB
Size Document Number Rev
21A1171
A
8
7
6
5
4
3
2
Date: Sheet of
1 1Tuesday, June 27, 2000
1
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