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REFERENCE DESIGNATION

R1126-R1127
R1128
R1301
R1402
R1403, R1454
R1406-R1407
R1408
R1411
R1416
R1434
R1439
R1440, R1455
R1441
R1450
R1456
R1457
R1460
R1461-R1462
S1
S2
S3
S301-S302
S901
SHR-01
SHR-02
SHR-03
SHR-04
SHR-05
SHR-06
SHR-07
SHR-08
SHR-09
SHR-10
SHR-11

SHR-12
SHR-13
SHR-14

T1
T101-T106

U401-U402, U501-U504, U701,

U1401-U1407

U1201
U1408
U1409
U1410

V1401
VR401
VR402, VR502
VR403, VR405, VR701
VR404
VR501, VR504
VR503
VR1101-VR1102
VR1103
VR1201
VR1401
W1
W 2
W3
W 4
XF1

SHURE

PART NO.

802612FK
708853FK
710041FK
801064FK
801080FK
800190FK
801033FK
801085FK
801089FK
801063FK
802609FK
801070FK
801051FK
801045FK
800749FK
802611FK
709314FK
802615FK
802630FK
802631FK
802632FK
801599FK
784110FK
235901FK
235902FK
235903FK
235904FK
235905FK
235906FK
235907FK
235908FK
235909FK
235910FK
235911FK

235912FK
235913FK
235914FK
803474FK
802626FK
706077FK

802588FK
802589FK
706097FK
706098FK
802598FK
802620FK
802622FK
802619FK
802621FK

802623FK
802624FK
802618FK
802681FK
800030FK
710138FK
802638FK
908575FK
908580FK
800618FK
802636FK

+ May not exhibit the low-noise characteristics of the original part.

DESCRIPTION

Resistor, Ceramic, Dual, .22, 5 W
Resistor, 22 K
Resistor, Ceramic, 10, 5 W
Resistor, 18 K
Resistor, 390 K
Resistor, 22, 1/2 W
Resistor, 47
Resistor, 1 M
Resistor, 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 W
Switch, Voltage Selector, DPDT
Switch, On/Off, SPST
Switch, Phantom Power, SPST
Switch, Slide, DPDT
Switch, Slide, DPDT
Printed Wiring Assembly, Lo-Z Input
Printed Wiring Assembly, Hi-Z Input
Printed Wiring Assembly, Aux/Mic
Printed Wiring Assembly, Channel
Printed Wiring Assembly, Master Control
Printed Wiring Assembly, Headphones Out
Printed Wiring Assembly, Headphones Control
Printed Wiring Assembly, Indicator
Printed Wiring Assembly, Limiter

Printed Wiring Assembly, Input/Output
Printed Wiring Assembly, Power
Printed Wiring Assembly, Sensor
Printed Wiring Assembly, Speaker Output
Printed Wiring Assembly, Main

Transformer, Power
Transformer, Mic Input

IC, Quad Op Amp (RCA )

IC, Thermal Sensor
IC, Voltage Regulator (Motorola MC7824)
IC, Voltage Regulator, Positive (Motorola MC7815)
IC, Voltage Regulator, Negative (Motorola MC7915)

Opto-Isolator
Potentiometer, Log, 100 K
Potentiometer, Dual, Linear, 50 K
Potentiometer, Log, 10 K
Potentiometer, Linear, 20 K
Potentiometer, Log, 100 K
Potentiometer, Linear, 10 K
Potentiometer, Linear, 100
Potentiometer, Linear, 1 K
Potentiometer, Linear, 47 K
Potentiometer, Linear, 5 K
Power Cable and Plug, 3 m (10 ft), 3-Conductor
Channel Bus Cable, Ribbon, 8-Conductor, with Connectors
Cable, Ribbon, 5-Conductor
Cable, Ribbon, 4-Conductor
Rear Panel Fuseholder

1 2

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...

Page 20: ...16...

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...

Page 29: ......

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