Crest ca 4, ca 6, ca 9 schematic
8
7
6
5
4
3
2
1
SERVO SEND CH A
VR SEND B
1
VR GND
2
VR RET B
3
J7A
22-29-2031
22-29-2031
D D
TO DISPLAY PCB
PHONEJACK STEREO
C C
+20.5V
+20.5V
+15.5V
VR RET A
1
VR GND
2
VR SEND A
3
J7B
21
3
J1
NC3FD
- SIG IN
+ SIG IN
J3
GND
1 2
3 4
5 6
GND
OTA CH B-15.5V+15.5V
-20.5V
OTA CH A
J8
CA-20H-2B-S
TO PWR SUPPLY
7 8
9 10
11 12
13 14
15 16
17 18
19 20
OTA CH A
-20.5V
-15.5V
OTA CH B
- SIG IN
21
3
J2
B B
NC3FD
+ SIG IN
J4
PHONEJACK STEREO
STEREO/BRIDGE
J9
123
22-29-2031
RETURN FROM VR
OUTPUT TO VR
D4
10K/1%
10K/1%
R3
R5
R7
NOTE 1
1N4148
1N4148
D2
D6
1N4148
C5
33pF/50V
BALANCED INPUT/GAIN CH A
NOTE 1:
CHART OF VALUES
R7,R8,R9,R10
R149,R249 43K/3W 56K/3W
R143,R144,R243,R244 2K29/0.1%2K32/0.1%
R125,R126,R225,R226
RETURN FROM VR
D3
1N4148
D5
D1
1N4148
C6
R8
33pF/50V
10K/1%
10K/1%
R4
1N4148
R6
NOTE 1
1N4148
CA-6 CA-9REF DES
34K/1%
1M1/1%
OUTPUT TO VR
+18V CH B
C4
0.1/25V
33pF/50V
D8
C8
R9
NOTE 1
6
-
7
5
+
IC1B
OPA2604AU
43.2K/1%
NOT USED
C7
33pF/50V
R10
84
NOTE 1
2
-
3
+
OPA2604AU
D7
1N4148
-20.5V
BALANCED INPUT/GAIN CH B
+15.5V
R138
R129
3.9K
IC103A
LM339D
R128
10K
10K
2
D121
1N4148
470pF/50V
R11
100K
R2
10K/1%
-
6
7
+
5
IC3B
+20.5V
R13
220K
C10
C2
0.1/25V
84
IC1A
OPA2604AU
3
+
1
2
-
C1
0.1/25V
-20.5V
OPA2604AU
2.2/5%/63V
R19
220K
1N4148
D15
R1
10K/1%
C12
C14
2.2/5%/63V
OPA2604AU
1N4148
SERVO/HIGH PASS
R120
576/1%
R21
10K
R23
2.7K
+20.5V
84
IC3A
2
-
3
+
D16
TO MODULE A
ATT. VOLTAGE
1
-20.5V
+15.5V
312
5
+
4
-
-15.5V
ATTENUATOR DRIVER
OTA CH B
16
15
14
13
12
11
10
C16
0.1/25V
1N4148
2.2/5%/63V
R38
R36
576/1%
1K/1%
R31
10K
D20
OTA CH A
R32
47K
576/1%
C13
R220
R22
10K
R24 2.7K
6
5
OPA2604AU
OPA2604AU
22/35V
-
+
C18
10/50V
Z2
C22
MLL4732
7
+20.5V
IC5B
84
2
-
IC5A
3
+
-20.5V
1
C19
0.22/16V
OTA CH A
C20
0.22/16V
ATT. VOLTAGE
TO MODULE B
SERVO SEND CH B
R229
3.9K
R228
10K
IC203A
LM339D
D222
1N4148
2
+15.5V
R238
10K
+15.5V
312
5
+
4
-
-15.5V
R35
OTA CH B
1K/1%
+15.5V
R27
10K
C17
10/50V
Z1
MLL4732
22/35V
R14
+20.5V
220K
0.1/25V
C9
470pF/50V
1
IC2A
R12
100K
5
+
6
-
OPA2604AU
IC2B
R33
R37
1K/1%
576/1%
1
2
3
4
5
6
7
8 9
IC4
NE5517AD
R34
1K/1%
-15.5V
ATTENUATOR
C11
2.2/5%/63V
R20
220K
R30
2.7K
R29
2.7K
D19
1N4148
R28
47K
0.1/25V
C15
C21
C3
7
D18
1N4148
D17
1N4148
SERVO/HIGH PASS
ATTENUATOR DRIVER
A A
IC103C
LM339D
+15.5V
IC103B
LM339D
IC203C
LM339D
+15.5V
IC203B
LM339D
-15.5V
R139
825K/1%
-
8
14
+
9
R141
2K21/.1%
R140
825K/1%
R142
2K21/.1%
-
6
1
+
7
NOTE 1
D122
1N4148
D123
1N4148
NOTE 1
R131
33.2K/.1%.5W
33.2K/.1%.5W
R125
R126
R130
33.2K/.1%.5W
R143
NOTE 1
R144
NOTE 1
33.2K/.1%.5W
R132
R133
CURRENT LIMITER
R155
R151
1M
R152
100K
R156
68.1/1%
MMBT5551
Q104
-15.5V
MMBT5401
Q105
R153
100K
R154
1M
68.1/1%
D114
1N4148
D115
1N4148
0.1/200V
IC103D
LM339D
+15.5V
11
+
13
10
-
CLIP DETECTOR CH A DRIVER
-15.5V
R239
825K/1%
-
8
14
+
9
R241
2K21/.1%
R240
825K/1%
R242
2K21/.1%
-
6
1
+
7
33.2K/.1%.5W
NOTE 1
1N4148
1N4148
NOTE 1
R231
R225
D222
D223
R226
R230
33.2K/.1%.5W
33.2K/.1%.5W
R243
NOTE 1
R244
NOTE 1
33.2K/.1%.5W
R232
R233
CURRENT LIMITER
R255
R251
1M
R252
100K
R256
68.1/1%
MMBT5551
Q204
-15.5V
MMBT5401
Q205
R253
100K
R254
1M
68.1/1%
D214
1N4148
D215
1N4148
IC203D
LM339D
+15.5V
11
+
13
10
-
CLIP DETECTOR
8
7
6
5
4
3
C112
0.1/200V
C114
0.1/50V
R157
68.1/1%
C110 0.001/50V
R158
68.1/1%
2SA1415
C115
0.1/50V
C113
C212
0.1/200V
C214
0.1/50V
R257
68.1/1%
C210 0.001/50V
R258
68.1/1%
2SA1415
C215
0.1/50V
576/1%
C213
0.1/200V
+HI RL
R159
576/1%
Q109
2SC3645
Q106
Q108A
MMPQ6700
R161
68.1/1%
R163
8.25K/1%
D116
1N4148
D117
1N4148
2SC3645
MMPQ6700
Q108B
R167
68.1/1%
68.1/1%
R164
8.25K/1%
68.1/1%
R162
68.1/1%
Q108C
MMPQ6700
Q107
R160
576/1%
R168
68.1/1%
MMPQ6700
Q108D
Q110
2SA1415
Q111
MMBT5551
R171
C116
R178
2.7K
33pF/500V
R179
11K/1%/1W
R180
576/1%
R172
R149
NOTE 1
Q112
MMBT5401
09-52-3152
J101
+36V
1
+HI RL
2
+VA-B
3
+IGM
4
+CLIP
5
+VA-C
6
GND
7
GND
8
FB
9
FB
10
-CLIP
11
-IGM
12
-VA-B
13
-HI RL
14
-36V
15
-HI RL
+HI RL
R259
576/1%
Q209
2SC3645
Q206
Q208A
MMPQ6700
R261
68.1/1%
R263
8.25K/1%
D216
1N4148
D217
1N4148
R262
68.1/1%
Q208C
MMPQ6700
Q207
2SC3645
MMPQ6700
Q208B
R267
68.1/1%
68.1/1%
R264
8.25K/1%
68.1/1%
R268
68.1/1%
MMPQ6700
Q208D
Q210
2SA1415
Q211
MMBT5551
R271
C216
R278
2.7K
33pF/500V
R279
11K/1%/1W
R280
576/1%
R249
R272
NOTE 1
Q212
MMBT5401
09-52-3152
NOISY & HIGH VOLTAGE TRACE
J201
+36V
1
+HI RL
2
+VA-B
3
+IGM
4
+CLIP
5
+VA-C
6
GND
7
GND
8
FB
9
FB
10
-CLIP
11
-IGM
12
-VA-B
13
-HI RL
14
-36V
15
R260
-HI RL
CH B DRIVER
CREST AUDIO
100 EISENHOWER DRIVE
PARAMUS, NJ 07652
Title
CA6, CA9 SERIES PREAMP
Size Document Number Rev
PREAMP.CA
D
2
Date: Sheet of
1
0 0Wednesday, May 17, 2000
02
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