Keypad and Display Assemblies

Owned by Brian Ross
Last updated: 2024/09/27

Scope

This document describes all variants of the Comb Keypad and Display assemblies. The document lists the changes between the versions and the Engineering Change Notices (ECN).

PCB Version: KPBL101-F

Release Date: 2018

Back Image

Front Image

Features:

  1. Keypad directly mounted onto Keypad/LCD PCB. 

  2. Fixed missing track between amplifier and output capacitor on KP101-E PCB.

  3. Removed ESD diodes from keypad as these would cause the I/O devices to blow on the main Intercom PCB.

  4. Backlight keypad.

  5. Onboard microphone.

  6. Pluggable LCD module.

Applicable ECN's

Remove the following diodes from the PCB:
D17, D20, D21, D24, D25, D28, D29, D32, D33, D36, D37, D40,
D41, D44, D45, D48, D49, D52, D53, D56, D57, D60, D61, D64

Check R10 for placement.

If not fitted, fit a 1M ohm 1206 SMD resistor.

Remove the capacitor C7.

Place the 0805 100R resistor.

Add a 10mm x 7mm acoustic sponge

Pink_Sponge.jpg

Place the acoustic sponge plug into the standard microphone rubber ring.

Pink_sponge.png

PCB Version: KPBL101-E

Release Date: 2018

Back Image

Front Image

Features:

  1. Increased the size of the contrast variable resistor.

  2. Keypad directly mounted onto Keypad/LCD PCB. 

  3. Added ESD diodes to protect Intercom from static discharge.

  4. Backlight keypad.

  5. Onboard microphone.

  6. Pluggable LCD module.

Applicable ECN's


Description

Diagram

Add a wire bridge between Pin 1 of U2 and R9

Remove the following diodes from the PCB:

D17, D20, D21, D24, D25, D28, D29, D32, D33, D36, D37, D40,
D41,D44, D45, D48, D49, D52, D53, D56, D57, D60, D61, D64

Check R10 for placement.

If not fitted, fit a 10 ohm 1206 SMD resistor.

Remove the capacitor C7.

Place the 0805 resistor.

Add a 10mm x 7mm acoustic sponge

Pink_Sponge.jpg

Place the acoustic sponge plug into the standard microphone rubber ring.


PCB Version: KPBL101-D
Release Date: 2016

Back Image

Front Image

Features:

  1. SMD contrast control.

  2. Keypad directly mounted onto Keypad/LCD PCB. 

  3. Backlight keypad.

  4. Onboard microphone.

  5. Pluggable LCD module.

Applicable ECN's


Description

Diagram

Add a 10mm x 7mm acoustic sponge

Pink_Sponge.jpg

Place the acoustic sponge plug into the standard microphone rubber ring.

PCB Version: KPBL101-C
Release Date: 2011

Back Image

Front Image

Features:

  1. Standard contrast control.

  2. Keypad PCB separate from Keypad/LCD PCB. 

  3. Backlight keypad.

  4. First iteration of the onboard microphone.

Applicable ECN's


Add a 10mm x 7mm acoustic sponge

Pink_Sponge.jpg

Place the acoustic sponge plug into the standard microphone rubber ring.

PCB Version: KP202
Release Date: 2008

Back Image

Front Image

Features:

  1. Simple PCB to interface ribbon connector to the keypad and LCD.

  2. Standard contrast control.

  3. No backlight keypad.

  4. No onboard microphone.

Applicable ECN



© 2018 Comb Communications. All Rights Reserverd.
http://www.comb-communications.com