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MODEL 1200 SERVICE MANUAL
TABLE OF CONTENTS
Description
.....................................
1
For Years of Dependable Service
....................
2
Troubleshooting ..................................
2
Service Instructions
...............................
3
External Parts
..................................
3
Diagnosis .....................................
3
External Fuse Replacement
.......................
3
Service Access
.................................
3
General Service Procedure
.......................
4
AC Voltage Measurements
........................
5
DC Voltage Measurements
........................
5
Resistance Measurements
........................
5
Chassis-Mounted Boards and Components
..........
5
A1 Reverb Pan
...............................
5
SHR-11 (and SHR12) Power Amplifier
Board Assembly
.............................
5
SHR-11 Potentiometer Adjust
..................
5
VR1101 Output Voltage Offset
................
6
VR1102 Driver Balance
.....................
6
VR1103 Idle Current
.......................
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 Board
.....................
7
SHR-03 Aux/Mic Board
........................
7
SHR-02 Hi-Z Input Board
.......................
7
SHR-01 Lo-Z Input Board.......................
7
SHR-13 Speaker Output Board
..................
7
B1 Fan
......................................
7
S3 Phantom Power Switch
......................
8
Front-Panel Boards and Components
...............
8
SHR-04 Channel Board (6)......................
8
Front Mounting Panel
..........................
8
SHR-05 Master Control Board
...................
8
SHR-09 Limiter Board
.........................
8
SHR-06 Headphones Output Board and
SHR-07 Headphones Control Board
.............
8
SHR-08 Indicators Board
.......................
8
S2 On/Off Switch
.............................
8
A1200MX Input Expansion Module
.................
9
Checking Active Components
.....................
9
Ferrite Beads
..................................
9
Service Illustrations
.............................
9
Optional Accessories
............................
9