QSC PLX Series Technical & Service Manual page 69

8 7
THIS DOCUMENT CONTAINS PROPRIETARY
INFORMATION WHICH IS THE PROPERTY
OF QSC AUDIO PRODUCTS, THAT MAY NOT
BE DISCLOSED, REPRODUCED OR USED
+15V
WITHOUT EXPRESS WRITTEN CONSENT FROM
QSC AUDIO PRODUCTS.
+13VCL
D
OPAMP POWER SUPPLIES P
-13VCL
-15V
TO SHUTDOWN OPTOCOUPLER, SH 5 (6V)
N335
C
BR-ON
SH 3
D48
4148
^D_SOT-23
DC_SENSE
SH 2, 3
R242
20.0K
^R_0805
P
D50 N338
Q87
4148
3906 -DC THRESH, -4V
^D_SOT-23
^Q_BJTP_SOT-23
3
N339
C71
D49
2
B
+DC THRESH 4V
4148
U10:1
47-10NP-10%
^D_SOT-23
^LM393-SMT
DC MUTING
SH 5
V-STBY
N349 J5:14 J6:14 N348
14 14
POWER LED
ON DISPLAY PCB
A
J5:16 J6:16
16 16
N350
8 7
6
N282
+14VIC +11V
N283
N285
A1
-14VIC -11V
N284
DP - STBY
+MID-RAIL
DC-OFF
TO OPTOCOUPLER LED
1.6V OF HYSTERESIS
N468
POSREF
P1
+15NTC
P
FAN SPEED THRESHOLD
ON-OFF DELAY,
THERMAL THRESHOLD
-15NTC
THERM HYST
R263
Q88
3906
P
392K
-MID-RAIL
^R_0805
+ NTCBUS
1
-
15V-SW D51 N341 U10:2
SEE SH 5
5
+
N340 4148
D55 N344
^D_SOT-23 6
-
4148
^LM393-SMT
^D_SOT-23
N474
P1
R264
2.21K
N347 C85 ^R_0805
N334
R265
.001-5%
^C_1206
2.21K
^R_0805
R253
Q89
4.75K
3904
^R_0805
^Q_BJTN_SOT-23
^Q_BJTN_SOT-23
P
FAN SPEED CONTROL
6
5 4
+HI-RAIL
ROUTE TO SPKR OUTPUT
N286 N287
PLC-2 USES MID RAILS ONLY
+MID-RAIL
TO PWR SUPPLY C-T
P1
N288
CH A V-MON, I-MON
NEGREF
OUTER COIL, 6T
D88
L-Z_A1
JUMPER
N469
N323
-MID-RAIL
N322
V-NEGSTEP
-HI-RAIL
POS RAIL
ROUTE TO SPKR OUTPUT
FROM PWR SUPPLY OPTOCOUPLER, SH 5
PS-OL
TO SHEETS 2 AND 3
MUTE+
N345
R270
1.50K
FULL MUTE, 5.7V
^R_0805
FULL CUTBACK, 2.8V, 1MA
CH B V-MON, I-MON
MUTE_HI
7
L-Z_B1
N360
+15V OUTER COIL, 6T
R267
2.21K
^R_0805
Q91
TIP 32C
N352
N353
J13:1
1 +FAN
Q90 N355 J13:2
2 -FAN
3904
-15V
5 4
3 2
DP-PAR-F
V-MON CONVERSION SCALES:
SH 2
PLC-2: (sim to 1.4) 30.1K / 2.00K = 15.05 Vout/Vmon
PLC-3: (between 1.8, 2.0) 33.2K / 1.5K = 22.13 Vout/Vmon
+11V
DP-BR-F
N289
SH 3
V-MON CH A
(NEW BMF SUBCODE,
P1 D 0-2V, 0.5V BITS)
INJECT V-DC
POST OPAMP,
NO GAIN SCALING
N291
SPKR-A
N290
-11V
SEE SH 2
D
TH-SUBC-A
N324
I-MON CH A
(WITH SEPARATE CH A
THERMAL SUBCODE)
D
N69
N327
N328
N330
D
N329
-IN_DPA
D
+11V +13VCL
N356
P1 D V-MON CH B
(PWR-SUPPLY- ON
SUBCODE: .8-1.3V)
+IN_DPA
SCALE 13V TO 1V NOM
N358
SPKR-B
+IN_DPB
N357
-11V
-IN_DPB
D
SEE SH 3
TH-SUBC-B
N361
I-MON CH B
(WITH SEP. CH B
THERMAL SUBCODE)
D
N149
N363
+15V
N364
N366 FOR 1/8 WATT:
110 MA, 1.1V MAX
D
N365
D
3 2
1
BMF VOLTAGE SCHEME: BINARY CODING, 2 BITS
SOURCE VOLTAGE, 13V NOM, 11V-14.5V (UNREG)
STEREO (NORMAL): BINARY 0,0 = 0V OUT
INPUTS PARALLEL: BINARY 0,1 = .5V NOM, .42-.575,
BR MONO: BINARY 1,0 = 1.0V NOM, .85-1.15
BR-MONO + PAR: BINARY 1,1 = 1.5V NOM, 1.27-1.72
NOM THRESHOLDS, 0.25, .75, 1.25.
D
FOR UNREG TRACKING DECODING, USE V-ON (1V NOM) AS REF
DATAPORT INPUT SENSITIVITY:
PLC 2:
7.87K / 5.60 K,
1.23V-IN -> 2.95V-DP
PLC-3:
4.75K / 5.60K
1.70V-IN -> 3.15V-DP
EURO-PLUG:
RAVE SIGNAL
FORMAT
+IN_CH-A
N297
+A
-IN_CH-A
N298
-A
GND
A1
C
DATAPORT
HD-15 JACK
N293 N299
-IN, A
N294 N300
STBY
N295 N301
VMON-A
N296 N302
IMON-A
CLIP_A N303
SEE SH 2 CLIP-A
N304
CHAS GND
N308
+IN, A
N305 N310
+IN, B
N311
+15V ??
N312
N306
D-REF
N307
-IN, B
N313 N314
B
IDR
N315
VMON-B
N317
N316 N318
IMON-B
CLIP_B
N319
CLIP-B
SET ID- R
N460
EURO-PLUG:
RAVE SIGNAL
FORMAT
+IN_CH-B
N320
+B
-IN_CH-B
N321
-B
GND
A1
CH GND
A
SIZE FSCM NO. DWG NO. REV
SH-000516-00
D B
SCALE CAD FILE NO. SHEET
NONE plx1602.sch 4 OF 5
1
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