Kongsberg Simrad IS12, Service Manual

Page: 8 / 67

Issue 1.0 06/06/03
SIMRAD
8
3 DISASSEMBLY / ASSEMBLY INSTRUCTIONS
A strong element of commonality exists between the instrument display units. The Assembly :
Case Back (E04000), Assembly : Case Front (E04006) and Bezel : Square (E03799) are common
throughout and disassembly and assembly of the various units can be considered to be identical
with one exception, in the Wind and Compass Instruments the Piezo Sounder is fitted with a Self
Adhesive Insulator Disc (E04227) to protect the Sounder from contact with the Pointer motor.
3.1 Instrument Display Units
Disassembly
Remove the Bezel (E03799) by lifting the top edge of the bezel to disengage the locking clips and
pull away from the instrument head thus freeing the bezel and Keypad.
Refer to Drawing Nos. E03893 and E04000 and remove the Instrument Mounting Gasket (E03837)
from the Case Rear and release the 10 screws (200288). Remove the Assembly : Case Front
(E04006) and ease the PCB from the case rear, the Sim Net Socket Headers ((E03995) and 7-
Way Terminal Seal (E03831) will remain fixed to the PCB and the Sim Net Socket Collars
((E03803) and “O” Rings (190044) will remain with the Case Rear. De-solder the leads to the
Piezo Sounder (160074) to release the PCB.
Assembly
Ensure that the Square Case Seal (E03830) is fitted securely into the seal well with the radius side
into the well and the flat side facing outwards. Solder the Sounder leads into place. Ensure that
the “O” Rings are in place in each Sim Net Socket Header. Guide the Sounder leads away from
the sockets, to avoid trapping them, and offer up the PCB assembly to the Case Rear, locating the
7-Way Terminal Seal and the Sim Net Header Sockets into their appropriate holes. Apply firm
pressure between the LCD edges and the Case Rear to press the sockets home. Locate the Case
Front over the LDC / PCB and place the assembly face down on a soft cloth. Engage the 10
Screws, if re-using the case front turn each screw anti-clockwise until it engages in the thread, the
screw will drop in with an audible “click” , and tighten the screws evenly until the seal is fully
compressed. Locate the Keypad in the holes in the Bezel and offer up the assembly to the
instrument head , angling the Bezel slightly backwards to prevent the keypad falling out. Press the
Bezel into place, a sharp “click” is audible as the locking clips engage.