Sandel SN4500 User manual

COMPONENT MAINTENANACE MANUAL
FOR
SANDEL SN4500 Primary Navigation Display
Document No. 82009-0133
Revision C, July 14, 2008
SANDEL AVIONICS, INC.
2401 Dogwood Way
Vista, CA 92081
Telephone: [phone]
Facsimile: [phone]
www.sandel.com
PROPRIETARY DATA
SANDEL AVIONICS proprietary rights are included in the information disclosed herein. Recipient by
accepting this document agrees that neither this document nor the information disclosed herein nor any
part thereof shall be reproduced or transferred to other documents or used or disclosed to others for
manufacturing or for any other purpose except as specifically authorized in writing by SANDEL
AVIONICS.

82009-0133-C SN4500 CMM Sandel Avionics Proprietary Page 2 of 6
Use or disclosure of data on this page is subject to the proprietary notice on page 1 of this document.
REVISION SHEET
REV Date Pages Para. DESCRIPTION OF CHANGES
C Jul 14, 2008 3-6 4. A/R 1020; Added procedure for changing
window
B Mar 27, 2007 3 2. Added software release via Service Bulletins
A Nov 29, 2006 All All A/R 867; Initial Release

82009-0133-C SN4500 CMM Sandel Avionics Proprietary Page 3 of 6
Use or disclosure of data on this page is subject to the proprietary notice on page 1 of this document.
1. APPLICABLITY
This document is applicable to maintenance for continued airworthiness of Sandel SN4500
Primary Navigation display:
Unit part number: SN4500-xxx, Software revision 1.00 or later
2. UPLOADING SYSTEM SOFTWARE AND DATABASES
System software is released via a Service Information Letter (SIL) or via a Service Bulletin
(SB) posted on the Sandel website. The SIL or SB contains links to the software and the
related software installation files necessary to load the software. Database updates are
available for purchase via the Sandel website. The database information site also contains
up-to-date links to database download instructions.
The SIL’s, SB’s and Database update information can be found at: www.sandel.com under
"Support".
3. OTHER MAINTENANCE
There is no additional maintenance required on the SN4500 Primary Navigation Display.
4. FIELD REPAIR
Window replacement is the only authorized in-field repair allowed on the SN4500 per the
following procedure. Replacement display windows, Sandel part number 61152 may be
ordered from Sandel.
Tools required
Small flat blade screwdriver
#1 Phillips head screwdriver
Important! Read through entire procedure first to familiarize yourself with the part terminology
and assembly sequence. Perform replacement in a clean environment.
Step 1. Remove encoder knobs:
1. Carefully pry heading and course knob caps from encoder knobs using a small, flat blade
screw driver or similar.
2. Loosen encoder knob collets using a flat blade screw driver and remove encoder knobs
from encoder shafts.

82009-0133-C SN4500 CMM Sandel Avionics Proprietary Page 4 of 6
Use or disclosure of data on this page is subject to the proprietary notice on page 1 of this document.
Figure 1. Encoder knob removal
Step 2. Remove bezel retaining screws
1. Place unit upright on bench.
2. Remove 4 ea flat head machine screws, 2-56 X .125 retaining bezel to actuator housing.
Hold bezel in place to prevent shifting of retained components.
Figure 2. Remove bezel retaining screws
Step 3. Remove bezel and window:
1. Carefully lift bezel from unit while disengaging bezel buttons and rubber keypad from
bezel. Do not remove or shift keypad, keypad circuit board, or Fresnel lens.
2. Remove existing window from unit.

82009-0133-C SN4500 CMM Sandel Avionics Proprietary Page 5 of 6
Use or disclosure of data on this page is subject to the proprietary notice on page 1 of this document.
Figure 3. Window removal
Step 4. Install replacement window:
1. Align replacement window to keypad and place onto Fresnel lens of face of unit.
2. Ensure that keypad, keypad circuit board, and Fresnel lens are properly located and have
not shifted during procedure.
Figure 4. Reinstall window
Step 5. Reinstall bezel:
1. Carefully reinstall bezel onto unit actuator housing. Ensure that the machined lip in
window engages bezel opening and that bezel fully seats.

82009-0133-C SN4500 CMM Sandel Avionics Proprietary Page 6 of 6
Use or disclosure of data on this page is subject to the proprietary notice on page 1 of this document.
2. Reinstall 4 ea flat head machine screws, 2-56 X .125.
Figure 5. Reinstall Bezel
Step 6. Reinstall encoder knobs:
1. Place encoder knobs over encoder shafts.
2. Leave approximately 0.06” (1.5mm) gap between back of encoder knob and face of
bezel.
3. Tighten encoder knob collets using flat blade screw driver. Verify knob operation by
rotating knob and pushing in knob. Detent in knob push should be detectable and knob
should not contact bezel. When depressed, verify gap dimension by slipping a piece of
paper between the knob and the bezel (paper is approximately 0.005” [0.1mm]). The
paper should fit easily.
4. Reinstall encoder knob caps into encoder knobs. Ensure proper location of heading and
course caps.
Figure 6. Reinstall Encoder Knobs
Step 7. Verify installation:
1. Ensure that all affected components are installed.
2. Ensure that bezel retaining screws are securely installed.
3. Ensure that all bezel buttons operate freely, without binding.