![](/html/2b/2b0b/2b0b30d876d6104f8219c519349a4b92ce5db8bcb4eac240b51ace348f9b1b58/bg1.png)
D
C
B
A
-15VA
+15VA
654321
JP2
1
0 OHM
D6
1N4148
D5
1N4148
R8
10K
R1
1M
2
R7
120 OHM
1
2
R2
2K67
R3
3K01
R4
4K22
R5
4K22
R6
35K7
Q1
2N4403
3
9
+
8
-
11
+
10
-
5
+
4
-
7
+
6
-
EXPLEDS_CH1
U1D
14
LM339
U1C
13
LM339
U1B
2
LM339
U1A
1
LM339
-15VA
CH1 EXPANDER LEDS
1
JP1
0 OHM
2
D4
D3
D2
D1
+15VA
R20
10K
-2dB
(RED)
-6dB
(RED)
-12dB
(RED)
-18dB
(RED)
+15VA
D16
1N4148
D15
1N4148
R14
10K5
R15
6K49
R16
5K76
R17
5K62
R9
5K62
R10
5K62
R11
8K45
R18
28K0
R12
124K
R19
120 OHM
1
2
11
10
11
10
R13
1M
Q2
2N4403
3
1
2
D12
1
0 OHM
D10
-15VA
JP10
0 OHM
D14
-2dB
(RED)
D13
-4dB
(RED)
-6dB
(RED)
JP6
-10dB
(RED)
-12dB
D9
(RED)
-15dB
D8
(RED)
D7
-25dB
(RED)
-8dB
D11
2
(RED)
LIMLEDS_CH1
U3D
9
+
8
-
+
-
5
+
4
-
7
+
6
-
9
+
8
-
+
-
5
+
4
-
7
+
6
-
14
LM339
U3C
13
LM339
U3B
2
LM339
U3A
1
LM339
U2D
14
LM339
U2C
13
LM339
U2B
2
LM339
U2A
1
LM339
CH1 COMPRESSOR LEDS
JP15
1
0 OHM
D18
1N4148
D17
1N4148
R28
10K
-15VA
+15VA
COMPLEDS_CH1
2
R27
120 OHM
1
3
Q3
2N4403
9
+
8
-
11
+
10
-
5
+
4
-
7
+
6
-
R21
1M
U4D
14
LM339
U4C
13
LM339
U4B
2
LM339
U4A
1
LM339
-15VA
2
R22
8K45
R23
5K90
R24
5K49
R25
5K76
R26
100K0
CH1 LIMITER LEDS
DRAWN:
RELEASED:
1
2
D22
D21
D20
D19
JP16
0 OHM
-3dB
(RED)
-6dB
(RED)
-9dB
(RED)
-12dB
(RED)
DETECT_CH1
DATED:
DATED:
C3
.01uF/25V
R32
10K
-15VA
+15VA
D24
1N4148
D23
1N4148
2
R29
549 OHM
R30
1K21
R33
3K83
R34
12K1
R35
30K1
JP19
1
0 OHM
COMPANY:
TITLE:
DRAWING NO:
REVISION RECORD
REVISIONS DONE OR ECO NUMBER:
VALUE CHANGES IN OUTPUT LED STRING
CHANGES AS PER ECO 425-001
ECO 425-8 SWAPPING LED REF DES.
D40-D43 & D60-D63
CORRECTED P/N AND DWG ERRORS,
CHG’D REV TO CONFORM TO NEW CONVENTION.
-20
LIMLEDS_CH1
(GREEN)
+15VA
-10
(GREEN)
0VU
(GREEN)
CLIP
(RED)
R31
120 OHM
1
Q4
2N4403
3
10
DETECT_CH1
2
8
11
5
4
7
LTR
B
C C4 & C5 ADDED AS PER ECO 169 2/13/92
E
A0
U5D
9
+
-
+
-
+
-
+
6
-
LM339
U5C
LM339
U5B
LM339
U5A
LM339
14
D25
13
D26
2
D27
1
D28
-15VA
CH1 OUTPUT LEDS
SYMETRIX INC.
14926 35th Ave. W.
Lynnwood, WA 98037
425 LED DAUGHTERBOARD
023425
FROM MOTHERBOARD
JP14
1
0 OHM
EXPLEDS_CH1
COMPLEDS_CH1
JP13
1
0 OHM
O/PLEDS_CH1
STEREO
D33
(RED)
DUAL
D32
(RED)
SHEET:
2
2
JP20
1
0 OHM
1
1
2
3
4
5
6
2
8
REV:
OF
12/19/91
J1A
J1B
J1C
J1D
J1E
J1F
DATE:
7/9/92D
8/24/93
B.G.
3/20/95
7
J1G
J1H
A0
4
D
C
B
A