Bose 4401 sqm 1 decoder service info en

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SQM-l FULL-LOGIC DECODER INFORMATION
GENERAL :
The BOSE SQM-l is a plug-in, printed-circuit board that allows proper

decoding of SQ source material and simulation of four-channel sound from

stereo sources.

The plug-in module becomes activated when the mode switch on the 4401

preamplifier is placed in either the SQ MATRIX or SQ LOOIC positions.

when the SQ MATRIX mode is selected, SQ encoded source material is
properly decoded to produce a four-channel output. This position may
also be used for other phase-matrix program material (such as Qs) for
pleasing four-channel effects. In addition, the SQ MATRIX position may

be used for enhancement of stereo program material.

when the 4401 mode switch is in the SQ LOGIC position, special full
wave-matching logic control circuitry is activated to improve separation
between all channels for optimum performance with SQ encoded program
material.

SPECIFIC:

Internally installed module connecting to JlOl of the 4401 preamplifier.

High-quality, glass epoxy, printed-circuit board construction.

Full wave-matching logic design incorporating three integrated circuits

with additional transistor power supply regulation.
Frequency response 50-15 kHz ::1 dB.

Harmonic distortion (THD) : 0.4% at 2 kHz.

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PARTS LIST

SYMBOL DESCRIPTION PART NUMBER
SgM-l DECODER
R32 1/4 W, Comp, 10 K, 5% 102938-103
R15,16,17 1/4 w, Comp, 180 K, 5% 102938-184
R31 1/4 W, Comp, 20 K, 5% 102938-203
R28,29,30 1/4 W, Comp, 5.1 K, 5% 102938-512
R14 1/2 W, Comp, 20 K, 5% 102942-203
R1,2,11,12 1/2 W, Comp, 3.6 K, 5% 102942-362
R3,4,9,10 1/2 W, Comp, 4.3 K, 5% 102942-432
R13 1/2 W, Comp, 110 Ohm, 5t 102942-111
R23 1/2 W, Comp, 2.2 K, 5% 102942-222
R22 1/4 w, Film, 12.4 K, 1% 162994-1242
R21 1/4 W, Film, 6.34 K, 10% 162955~6341
R18 10 K Separation Rot 104255
Cagacitors
C42,43,44 0.001 uf Disc Ceramic 103729
C6,20,22,25,
40,41 0.01 uf Disc Ceramic 103730
C23,24,26,27 Electrolytic, Non-polar, 5 pf, 15 V 103737
C13,14,17,1B 0.0039 uf Disc Ceramic 104243
C3,9 0.0068 uf, 5%, 50 V, Mylar 104244
C1,4,8,11 0.039 uf, 5%, 50 V, Mylar 104245
C15,16,19 0.056 pf, 10%, 50 V, Mylar 104246
C2,10 0.22 uf, 5%, 50 V, Mylar 104247
C3C,31 Electrolytic, PC, 4.7 uf, 35 V 104248
C33,34 Tantalum, 1 uf, 10%, 25 v 104250
C37,38 Tantalum, 1.5 uf, 10%, 25 V 104251
C28,29,39 Tantalum, 4.7 uf, 10%, 25 V 104252
C5,7 0.0033 uf Disc Ceramic 104559
C21,45 Electrolytic, PC, 25 uf, 25 V 104560
C35,36 Electrolytic, PC, 47 uf, 25 V 104561
C32 Electrolytic, PC, 100 pf, 25v 103829
Semiconductors
CR1 Diode IN4148 , 102410
01 Integrated Circuit, MC1312P 104257
U3 Integrated Circuit, MC1314P 104258
02 Integrated Circuit, MC1315P 104259
21 Transistor, PNF, 2N3644 103851