Toshiba CTX28 manual Telephone Headset Bheu Upgrade, 11-7, Bheu Installation

Station Apparatus

3000-series Telephone Option PCBs

Telephone Headset (BHEU) Upgrade

The BHEU can be installed into the DKT3000-series telephones to enable headset or external ringer use. For information on connecting the external ringer, refer to “Telephone (BHEU) to External Speaker (HESB) Cable Connection” on page 12-18. The BHEU can also be installed into DKT3010 and DKT3020 telephones that have either a BVSU or BPCI installed. For DKT3001 and DKT3014 telephones, the installation is same as below, only the connector location is different.

BHEU Installation

1. Loosen the four captive screws

Headset Modular

Connector

on the telephone base, and

remove the base. Knock out hole

for the BHEU cord (see Figure

11-2).

2. If you are connecting an ECM or

Carbon-type headset to the

BHEU, leave the BHEU jumper

in the “AUTO” position (see

Figure 11-4).

BHEU1A

AUTO CARBON

SW1

5502 P1

Transmission Level

NORMAL

SW2 LOW

“AUTO” enables the BHEU

current detector to determine

which headset type is connected

(less than 2mA detects EMC and

more than 2mA detects Carbon).

If, in a rare case the current is

marginal using a carbon headset

(only) and performance is not

adequate, set the jumper to

“CARBON.”

RED

Figure 11-4 BHEU PCB

Station Apparatus

Strata CTX I&M 06/04 11-7