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REFERENCE DESIGNATON

MP6
MP7
MP8
MP9
MP10
P1003-P1004
P1401
Q501, Q1110, Q1403
Q1101, Q1114
Q1102

Q1103-Q1104
Q1105,Q1109
Q1106
Q1107-Q1108
Q1111
Q1112-Q1113
Q1401-Q1402, Q1404
Q1405
Q1406

R101-R106
R201-R206, R405, R520, R522,

R1404, R1415, R1445, R1452

R301, R304, R514
R302, R305
R303, R306, R407, R414, R416, R503,

R513, R1401, R1412, R1423,
R1426-R1427, R1430

R401, R518
R402
R403
R404, R409-R410, R502, R504,

R512, R519, R602

R406, R408, R505-R506

R411, R1410, R1422, R1424, R1448-R1449
R412, R1006, R1409, R1420-R1421,

R1433, R1435-R1438, R1443, R1446,
R1451, R1458

R413, R1419, R1453
R415, R523, R601, R704, R1414,

R1417-R1418, R1425, R1429, R1442,
R1444, R1447

R501, R511

R507
R508, R515, R1428
R509, R516-R517
R510
R521, R1001-R1005, R1413,

R1431-R1432, R1459

R603-R605
R701, R703
R702
R1101
R1102, R1104
R1103, R1112, R1201
R1105
R1106-R1108
R1109
R1110
R1111
R1113
R1114
R1115
R1116
R1117
R1118-R1119
R1120, R1122
R1121, R1123
R1124-R1125

SHURE

PART NO.

802583FK
802584FK
802585FK
802587FK
802642FK
802628FK
711080FK
706102FK
706146FK
800412FK
802590FK
801798FK
706156FK
802591FK
706155FK
802592FK
706537FK
706139FK
706147FK
802610FK

Knob, Red
Knob, Blue
Knob, White
Fan Grille, Front Panel
Fan Grille, Rear Panel

Connector, Receptacle, 2-pin
Connector, Receptacle, 8-pin
Transistor, PNP (RCA SK3932)
Transistor, Dual, NPN (RCA SK9427)
Transistor, Dual, FET
Transistor, Power, PNP (RCA SK9042) (requires 802681FK insulator)
Transistor, NPN
Transistor, NPN (RCA SK9118)
Transistor, Power, NPN (requires 802639FK insulator)
Transistor, PNP (RCA SK9363)
Transistor, Power, PNP (requires 802639FK insulator)
Transistor, FET
Transistor, NPN (RCA SK9137)
Transistor, PNP (RCA SK9138)

Resistor, 1.8 K

801057FK

Resistor, 4.7 K

801059FK

Resistor, 6.8 K

801068FK

Resistor, 39 K

801065FK
802607FK
801075FK
801076FK

Resistor, 22 K
Resistor, 2 K, 2%
Resistor, 150 K
Resistor, 180 K

801061FK
801058FK
801081FK
801073FK

Resistor, 10 K
Resistor, 5.6 K
Resistor, 470 K
Resistor, 100 K

801072FK

Resistor, 82 K

801069FK
801062FK

801055FK
801077FK
801041FK
803041FK

Resistor, 47 K
Resistor, 12 K
Resistor, 3.3 K
Resistor, 220 K
Resistor, 220
Resistor, 43 K (Early Production); 30 K (Later Production)

801053FK
802614FK
802815FK
803042FK
708857FK
708842FK
708845FK
708835FK
708850FK
708906FK
708934FK
802617FK
803043FK
708838FK
708836FK
802616FK
802610FK
708849FK
708854FK
708840FK
802613FK

Resistor, 2.2 K
Resistor, Metal Oxide Film, 220, 1 W
Resistor, 13 K, 1%
Resistor, 680, 2%
Resistor, 47 K
Resistor, 2.7 K
Resistor, 4.7 K
Resistor, 680
Resistor, 12 K
Resistor, 1.8 K, 2%
Resistor, 47 K, 2%
Resistor, Metal Oxide Film, 5.6 K, 2 W
Resistor, Metal Oxide Film, 68, 1/2 W
Resistor, 1.2 K
Resistor, 820
Resistor, Metal Oxide Film, 3.9 K, 2 W
Resistor, Metal Oxide Film, 1.8 K, 1/2 W
Resistor, 10 K
Resistor, 27 K

Resistor, 1.8 K
Resistor, Metal Oxide Film, 100, 1 W

DESCRIPTION

11

Summary of Contents for AUDIOMASTER 1200

Page 1: ...7 50 Model 1200 Powermixer SERVICE MANUAL ISSUE NO 1 Manufactured by SHURE BROTHERS INC 222 Hartrey Avenue Evanston Illinois 60202 3696 Copyright 1988 Shure Brothers Inc AL954 HE 27A8187 Printed in U...

Page 2: ...to 30 2 to 63 V PA INPUT 1 dBV 891 mV Voltage Gain at 1 kHz INPUT OUTPUT SPEAKER PGM MIX MONITOR PHONES TAPE LO Z 95 dB 65 dB 71 dB 82 dB 51 dB HI Z 73 dB 43 dB 49 dB 60 dB 29 dB AUX 55 dB 25 dB 31 d...

Page 3: ...ent 6 SHR 12 Temperature Sensor Board 6 VR1201 Temperature Sensor Threshold 6 SHR 14 Main Board 6 VR1401 Power Amplifier Limiter Threshold 7 Rear Panel Boards and Components 7 SHR 10 Input Output Boar...

Page 4: ......

Page 5: ...l has color coded knobs for ease of adjustments while LED indicators give instant notice of The 1200 is rack mountable or portable Its 6 inputs are expandable to 8 or 10 inputs through the use of A120...

Page 6: ...Powermixer is dead no output POWER LED off PROBABLE CAUSE AND CORRECTION 1 Check that ac power source is live and Model 1200 is plugged in 2 Check that POWER switch is on 3 Check that rear panel fuse...

Page 7: ...verb Return full counterclockwise and Eq controls centered Turn the unit on and apply a 0 5 mV 1 kHz test signal across pins 2 and 3 of one of the Bal Lo Z input connectors Normal voltmeter readings t...

Page 8: ...Push on connectors must be removed by pulling straight out The side of a small screw driver blade inserted between the free and fixed connector can sometimes be helpful in separating the connector Do...

Page 9: ...reverb Output Use the previously removed screws to secure the reverb pan to the reverb shield and to secure the shield to the chassis bottom and the parallel vertical interior shield Be sure to repla...

Page 10: ...12 from the large heat sink remove the Power Amplifier Board Assembly from the 1200 as described above Then remove the two Phillips screws that hold SHR 12 to the small vertical heat sink When replac...

Page 11: ...onnectors from AA AB BA and BB to P201 and P202 of SHR 02 and from AC AD BC and BD to P102 and P104 of SHR 01 Remove the four Phillips screws that hold the switches to the rear panel SHR 03 can be com...

Page 12: ...the nuts holding the control shafts to the Mounting Panel 3 To free the board pull the shafts back out of the panel SHR 06 HEADPHONES OUTPUT BOARD AND SHR 07 HEAD PHONES CONTROL BOARD SHR 06 and SHR 0...

Page 13: ...High High Emitter Collector High High Collector Base High Low Emitter Base High Low Base Collector Low High Base Emitter Low High FERRITE BEADS All low impedance microphone connectors contain ferrite...

Page 14: ...713373FK 784104FK 784108FK 802625FK 788427FK 802579FK 802580FK 802581FK 802582FK Reverb Pan Fan DESCRIPTION Capacitor Electrolytic 0 22 F 50 V Nichicon UKB1HR22KAA Capacitor Electrolytic 22 F 16 V Nic...

Page 15: ...NPN RCA SK9427 Transistor Dual FET Transistor Power PNP RCA SK9042 requires 802681FK insulator Transistor NPN Transistor NPN RCA SK9118 Transistor Power NPN requires 802639FK insulator Transistor PNP...

Page 16: ...r 2 2 M Resistor 15 K Resistor 51 K 2 Resistor 56 K Resistor 1 5 K Resistor 470 Resistor Metal Film 100 K 1 Resistor Metal Film 36 K 1 Resistor Metal Oxide Film 39 1 2 W Resistor Metal Oxide Film 47 2...

Page 17: ...BLOCK DIAGRAM...

Page 18: ...LEAD CODES...

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Page 22: ...18...

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Page 24: ...20...

Page 25: ...21 CIRCUIT DIAGRAM 1 SHR 01 SHR 02 SHR 03 SHR 04...

Page 26: ...22 CIRCUIT DIAGRAM 2 SHR 05 SHR 07 SHR 08 SHR 10...

Page 27: ...CIRCUIT DIAGRAM 3 SHR 09 SHR 12 SHR 14 23...

Page 28: ...CIRCUIT DIAGRAM 4 SHR 06 SHR 11 SHR 13 SHR 14 24...

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