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REPLACEMENT PARTS LIST

The following list provides information on replacement parts for the Shure Model 1200 AUDIOMASTER Powermixer. Shure part numbers

are given for all parts and, where available, manufacturer’s name and part number for 

acceptable 

equivalents in parentheses following the

part description (note that for optimum performance, only direct replacement parts should be used).

NOTE: 

Carbon film resistors shown in this parts list are rated at 0.2 watts. Standard 1/8-watt resistors should only be used as

replacements if circuit power requirements are not exceeded. Standard 1/4-watt resistors can only be used if they are physically mounted
in a vertical position.

NOTE: 

In early production, PC Board Assembly SHR-14 contains the following legend error: Capacitor C1423 is marked “+” on the

wrong lead. Note the position of C1423 and replace (if necessary) according to the part, not the legend.

REFERENCE DESIGNATION

A1

B1
C401, C702, C1405, C1408
C402, C410-C411, C413, C508, C509

C404
C407, C503
C408-C409, C501-C502, C1410
C412, C1411, C1415
C506, C510-C511, C1414
C701
C1006
C1101
C1103
C1104, C1113
C1105, C1107
C1106
C1108
C1109, C1112
C1110-C1111
C1201
C1301
C1401
C1403
C1406, C1412-C1414
C1407
C1417-C1418
C1419
C1420-C1421
C1422-C1423
C1424-C1425
C1426-C1428

D401-D404, D701-D702, D1401-D1418
D405
D801-D802
D803
D804
D1101
D1102-D1105
D1106-D1107, D1419-D1421
D1422
D1423
D1424
F1
F1401-F1402
F1403-F1404

J1
J101-J106
J201-J206, J1001-J1005
J601, J1301-J1302
L101-L112

L1101
MP1
MP2
MP3
MP4
MP5

SHURE

PART NO.

803039FK
802641FK
707471FK
707416FK
707425FK
707707FK
707725FK
707439FK
707424FK
800660FK
707351FK
707344FK
707328FK
707358FK
802602FK
707316FK
707350FK
708009FK
707629FK
707315FK
802600FK
707714FK
707571FK
707416FK
707705FK
707438FK
707329FK
707322FK
707354FK
802599FK
802605FK
800625FK
802594FK
800633FK
802596FK
802597FK
706541FK
802593FK
706306FK
706319FK
706323FK
706322FK
713642FK
802634FK
784129FK
802633FK
802629FK
713373FK
784104FK
784108FK
802625FK
788427FK
802579FK
802580FK
802581FK
802582FK

Reverb Pan
Fan

DESCRIPTION

Capacitor, Electrolytic, 0.22 µF, 50 V (Nichicon UKB1HR22KAA)
Capacitor, Electrolytic, 22 µF, 16 V (Nichicon UKB1C100KAA)
Capacitor, Electrolytic, 10 µF, 25 V (Nichicon UKB1E100KAA)
Capacitor, Mylar, 0.0015 µF (Panasonic ECQ-B1H152JZ)
Capacitor, Mylar, .047 µF (Panasonic ECQ-V1H473JZ)
Capacitor, Electrolytic, 1 µF, 50 V (Nichicon ULB1H010MAA)
Capacitor, Electrolytic, 4.7 µF, 25 V (Nichicon ULB1H4R7MAA)
Capacitor, Electrolytic, 10 µF, 50 V (Nichicon ULB1H100MAA)
Capacitor, Electrolytic, 100 µF, 50 V (Nichicon ULB1H101MPA)
Capacitor, Electrolytic, 1 µF, 50 V (Nichicon ULB1H010MAA)
Capacitor, Electrolytic, 47 µF, 25 V (Nichicon ULB1E470MAA)

Capacitor, Electrolytic, 10 µF, 63 V (Nichicon ULB1J100MAA)
Capacitor, Ceramic, 10 pF, 500 V
Capacitor, Electrolytic, 22 µF, 16 V (Nichicon UKB1C100KAA)
Capacitor, Electrolytic, 47 µF, 50 V (Nichicon ULB1H470MAA)
Capacitor, Ceramic, 100 pF, 100 V
Capacitor, Mylar, .1 µF (Panasonic ECQ-V1104JZ)
Capacitor, Electrolytic, 10 µF, 16 V (Nichicon UKB1C100KAA)
Capacitor, Mylar, .047 µF, 100 V (Sprague 225P47391WD3)
Capacitor, Mylar, 0.0056 µF (Panasonic ECQ-B1H562JZ)
Capacitor, Bipolar Electrolytic, 10 µF, 16 V (Panasonic ECE-A1CN100S)
Capacitor, Electrolytic, 10 µF, 16 V (Nichicon UKB1C100KAA)
Capacitor, Mylar, .001 µF (Panasonic ECQ-B1H102JZ)
Capacitor, Electrolytic, 0.47 µF, 50 V (Nichicon UKB1HR47KAA)
Capacitor, Electrolytic, 100 µF, 25 V (Nichicon ULB1E101MAA)
Capacitor, Electrolytic, 1000 µF, 16 V (Nichicon ULB1C102MRA)
Capacitor, Electrolytic, 470 µF, 50 V (Nichicon ULB1H471MRA)
Capacitor, Electrolytic, 10,000 µF, 63 V
Capacitor, Ceramic, .01 µF, 500 V

Diode (RCA SK3100)
LED, Red (RCA SK2022/3022)
LED, Red (RCA SK2022/3022)
LED, Yellow (RCA SK2021/3021)
LED, Green (RCA SK2024/3024)
Diode, Zener (RCA SK24A)
Diode (RCA SK3100)
Diode (RCA SK3311)
Silicon Rectifier (RCA SK3647)
Silicon Rectifier
Silicon Rectifier
Fuse, 5 A, 250 V (Littelfuse 312005)
Fuse, 0.75 A, 250 V (Littelfuse 312.750)
Fuse, 8 A, 250 V (Littelfuse 312008)
Outlet, Unswitched AC
Connector, XLR-type Receptacle, 3-pin (Cannon XLB-3-31PC)
Phone Jack, 2-Circuit
Headphone Jack, 3-Circuit
Ferrite Bead
Coil, 4.6 µH
Rubber Foot
Knob, Green, Bass
Knob, Green, Treble
Knob, Black
Knob, Gold

10

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...

Page 19: ...15...

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Page 21: ...17...

Page 22: ...18...

Page 23: ...19...

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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