Crest 4801 set, 21D1977 User Manual
8
7
6
5
4
3
2
1
TEMP 'A'
R123
IGM 'A'
D D
R119
CLIP 'A'
10K
R122
220
R118
100K
312
A/CLIP
5
+
2
4
-
IC101A
LM339
+24V
R117
2.2K
R121
10K
C C
0.1/50V
R120
100K
B/CLIP
7
+
1
6
-
IC101B
LM339
C105
0.1/50V
C104
10K
9
+
8
-
R124
10K
R125
10K
11
+
10
-
R126
10K
D107
1N4001
D108
1N4001
D109
1N4001
D110
1N4001
LM339
LM339
IC101C
IC101D
R101
14
4.7K
R109
13
4.7K
3
2
5
6
1N4148
84
+
1
-
IC102A
LM358A
R102
4.7K
D102
1N4148
+
7
-
IC102B
LM358A
R110
4.7K
D105
VDDA
VDDB
VEEA
VEEB
R105
100
C101
1/50V
R103
2.7K
R107
4.7K
TEMP 'B'
R111
2.7K
R115
4.7K
1/50V
Z101
R108
1K
1N5918A
(5.1V)
R113
100
C103
0.1/50V
PROT 'A'
DATA 'A'
C102
Z102
R116
1K
1N5918A
(5.1V)
PROT 'B'
DATA 'B'
A/DATA
AUX GND
B/DATA
A/+16V
B/+16V
A/-16V
B/-16V
DATA & POWER CONN.
26-48-1075
1
2
3
4
5
6
7
J3
IGM 'B'
CLIP 'B'
34 V. AC
2N5551
Q4
470/6.3V
D10
1N4148
R8
100K
D8
1N4148
C4
100/25V
R6
2.7K
D6
1N4148
10K
D4
1N4148
R4
D2
1N4148
M6
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
26-48-1155
27 V. IN
SIGNAL CH. B SIGNAL CH. A
CLIP CH. B
CONTROL V. CH. B
LIMIT CH. B
SPKR. RAIL CH. B
MUTE CH. B
TEMP SENSOR +
TEMP SENSOR OUT
TEMP SENSOR GND.
GROUND
RELAY GROUND
RELAY GROUND
RELAY 1,3
RELAY 2,4
2N5551
Q2
LED 4
SIGNAL
C2
1/50V
R12
5K/5W
TR2
MAC97A
C7
R14
10K
R5
D7
1N4148
2.7K
Q1
2N5551
R13
10K
3A/MINI
44 V. OUT
F1
BR1
RS202
M5
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
26-48-1155
C6
470/50V
D3
1N4148
R3
10K
D5
1N4148
34 V. AC
CLIP CH. A
CONTROL V. CH. A
LIMIT CH. A
SPKR. RAIL CH. A
B B
MUTE CH. A
TEMP SENSOR +
TEMP SENSOR OUT
TEMP SENSOR GND
GROUND
GROUND
GROUND
TRANSFORMER TEMP GND
TRANSFORMER TEMP
R11
5K/5W
MAC97A
R7
100K
LED 3
SIGNAL
D9
C1
1N4148
1/50V
TR1
470/6.3V
C8
100/25V
2N5551
C3
R9
2.7K
Q3
LED 1
CLIP
Z1
1N5927A
0.1/50V
C5
1N5927A
R10
2.7K
LED 2
CLIP
Z2
D11
1N4148
LED 5
TEMP/DC
R17
2.7K
1
IC1A
LM614
R38
R25
100K
4.7K
26-48-1035
LED 7
D13
ACTIVE
1N4148
R15
M7
3
2
1
VR1
5KB
2.7K
MPSA75
Q5
R27
390
A A
8
7
R19
5.1K
-
2
+
3
4 13
1N4148
R29
10K
1N4148
R21
D15
7
IC1B
LM614
D17
12-14-93
NOTE 1
6
R23
750/1%
1K
D19
1N4148
-
6
+
5
R31
390K
CHANGE R101,R109 FROM 10K TO 4.7K.
CHANGE R103,R111 FROM 2.2K TO 2.7K.
CHANGE R107,R115 FROM 3.3K TO 4.7K.
CHANGE R108,R116 FROM 2.2K TO 1K.
CHANGE Z101,Z102 FROM 1N5913 TO 1N5918.
499/1%
R33
4.7K
IC1E
LM614
R35
R23,R24 WILL CHANGE TO 1K/1% WITH UL APPROVAL.
8
13
9
R37
2.2K
499/1%
R24
750/1%
D18
1N4148
R36
R34
4.7K
R22
1K
D14
-
15
16
+
14
IC1D
1N4148
LM614
R32
390K
D16
1N4148
5
R20
5.1K
12
11
R39 100K
R30
10K
3
26-48-1035
M8
3
2
1
CREST AUDIO
100 EISENHOWER DRIVE
PARAMUS, NJ 07652
Size Document Number Rev
21D1977-xx
D
2
Date: Sheet of
1
0 0Wednesday, May 17, 2000
LED 6
LED 8
D12
ACTIVE
TEMP/DC
R18
2.7K
+
10
-
IC1C
LM614
R26
4.7K
R28
390
R16
2.7K
Q6
MPSA75
1N4148
4
VR2
5KB
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