Northern Airborne Technology 250 User Manual
DOCUMENT NUMBER 250-16-1
250
PASSENGER SPEAKER AMPLIFIER
INSTALLATION AND OPERATION MANUAL
REV "-" Sep 15, 2004
Northern Airborne Technology Ltd.
1925 Kirschner Road
Kelowna, BC, Canada.
V1Y 4N7
Telephone (250) 763-2232
Facsimile (250) 762-3374
Copyright 2004 by Northern Airborne Technology
Amendment #2 October 21, 2004
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
SM250 Rev. - 250 Passenger Speaker Amplifier Manual
Northern Airborne Technology Ltd.
has acquired the assets of dB Systems Inc.,
and has reissued this manual in its entirety
Northern Airborne Technology Ltd.
will be responsible for all future
amendments and revisions.
Sep 15, 2004 Page ii
ENG-FORM: 820-0109.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
SM250 Rev. - 250 Passenger Speaker Amplifier Manual
Periodically NAT will release manual amendments. In order to maintain the most
accurate and up to date manual these amendments should be carried out immediately
upon receipt and recorded on the following amendment record.
AMENDMENT RECORD
Amendment
Number
1 Sep 15/04
2 Oct 21/04
Amendment
Date
Section(s)
Changed
Date
Entered
Entered By
Performed at Factory
Performed at Factory
Insert any Amendment Instruction sheets after this page.
Sep 15, 2004 Page iii
ENG-FORM: 820-0109.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
INSTALL_OPS
MANUAL AMENDMENT
Manual: 250-16-1 Amendment #: 2
Document #: Install_Ops\250\809-0002 Amendment Date: Oct 21, 2004
The purpose of this amendment is to update the 250 outline drawing.
Amendment Instructions:
1
Page b Amendment #1 Page b Amendment #2
Page d Amendment #1 Page d Amendment #2
Page 7 Amendment#1 Page 7 Amendment #2
Note: Ensure that all drawings are inserted in the order shown on the latest drawing lists.
2 Update the Amendment Record sheet at the front of the manual.
3 Insert this page into the manual after the Amendment Record sheet (page iii).
Manual Amendment ends after the following amended pages
Remove Pages Replace With Pages
Title Page Amendment #1 Title Page Amendment #2
Amendment #2 Oct 21, 2004 Page 1
ENG-FORM: 809-0108.DOT
PROPRIETARY AND CONFIDENTIAL TO NORTHERN AIRBORNE TECHNOLOGY LTD.
INSTALL_OPS
MANUAL AMENDMENT
Manual: SM250 250 Amendment #: 1
Document # SM250\Install_Ops\809-0001 Amendment Date: Sep 15, 2004
The purpose of this amendment is to update all applicable drawings.
Amendment Instructions:
1
Pages b – c Pages b – d Amendment #1
Page 7 Page 7 Amendment #1
2
3 Update the Amendment Record sheet at the front of the manual.
4 Insert this page into the manual after the Amendment Record sheet (page iii).
Manual Amendment ends after the following amended pages
Remove Pages Replace W ith Pages
250-16-1 Title Page Rev - SM250 Title Page Rev -
Insert Pages After Page
Page ii – iii SM250 Title Page
Amendment #1
ENG-FORM: 809-0108.DOT
PROPRIETARY AND CONFIDENTIAL TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Sep 15, 2004 Page 1
EQUIPMENT MANUAL 250-16-1 REV -
CHANGE RECORD
DATE
3-11-03 ORIGINAL DOCUMENT RELEASED
CHANGE
APPROVAL
250/250-16-1
Page a
EQUIPMENT MANUAL 250-16-1 REV -
TABLE OF CONTENTS
Page
1.0 OPERATING INSTRUCTIONS AND EQUIPMENT LIMITATIONS ................................................. 1
2.0 SPECIFICATIONS............................................................................................................................. 3
3.0 INSTALLATION PROCEDURES, WIRING DIAGRAM, AND LIMITATIONS................................... 6
3.1 PHYSICAL......................................................................................................................................... 6
3.2 ELECTRICAL .................................................................................................................................... 6
Tables
Table A Detail Part Numbers ................................................................................................................ c
Table B Figures with Applicable Serial Numbers..................................................................................d
Table 1 Pin Identification....................................................................................................................... 9
Table 2 Environmental Qualification Form ......................................................................................... 13
Figures / Drawings
250 Outline, Model 250-[ ], Passenger Speaker Amplifier (Rev 1.71) ......................................... 7
Figure 2 Model 250-[ ] Block Diagram ................................................................................................. 8
Figure 3 Model 250-[ ] Wiring Diagram..............................................................................................10
Figure 4 Internal Trim Pot Adjustments ............................................................................................... 13
250/250-16-1 Amendment #2 Oct 21, 2004
Page b
EQUIPMENT MANUAL 250-16-1 REV -
MODEL 250 DETAIL PART NUMBER DESCRIPTIONS
The detail part numbers associated with the Model 250 Passenger Speaker Amplifier may define
different level adjustments and/or test procedures than those outlined in the calibration and test
table of document No. 250-4, Acceptance Test Procedure. Table A describes those differences.
NOTE: A Model 250 with an associated detail part number is designated as a Model 250-XXX,
where XXX is the applicable detail part number.
Table A. Detail Part Number Description
Detail Part Number Description of Difference
001 Low Pass Filters adjusted for –3 dB attenuation at 70 Hz on Left
and Right Speaker Outputs. High Pass Filters adjusted for –3 dB
attenuation at 20 Khz on Left and Right Speaker Outputs.
-001 calibration is designed for use with
dB Systems 250-61, 4-inch speakers.
002 The Model 250-002 has no differences from the Base Model
003 Identical to Base Model with the following changes:
- Stereo Left and Stereo Right inputs are reduced to 0.45 Vrms.
- Stereo Left and Stereo Right input gain is increased so that the
outputs are the same as the Base Model.
MOD A units use PCB 250-81 to prevent speaker popping on
power up. MOD B units include PCB 250-91 in place of PCB 250-
81. PCB 250-52 includes the increased stereo gain.
250/250-16-1 Amendment #1 Sep 15, 2004
Page c
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