Toshiba Strata CTX100 - Telephone Headset (BHEU) Upgrade

Station Apparatus
3000-series Telephone Option PCBs
Strata CTX I&M 10/02 8-7
Station Apparatus
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 External Ringer”
on page 9-17. 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
on the telephone base, and
remove the base. Knock out hole
for the BHEU cord (see Figure
8-2).
2. If you are connecting an ECM or
Carbon-type headset to the
BHEU, leave the BHEU jumper
in the “AUTO” position (see
Figure 8-4).
“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.”
3. Make sure that the SW2 jumper plug
is set to “NORMAL.”
4. If you do not want the handset
receiver to work when the handset is
on-hook and a headset (connected to
BHEU) is being used, cut the HEU
strap on the DKT PCB (see Figures
8-7 and 8-8).
5. Position the BHEU PCB (component
side down) on the standoffs inside the
base, and secure with the two
provided screws (see Figure 8-5).
6. Connect the BHEU integrated wire
plug to P3 (HEU) on the telephone
base PCB (see Figures 8-6 and 8-9).
Note the location of the red wire.
...or for DKT3001 telephones only,
connect the BHEU wire plug to P1
(HEU) on the telephone base PCB
(see Figure 8-9). Note the location of
the red wire.
BHEU1A
P1
SW1
SW2
AUTO
CARBON NORMAL
LOW
RED
Transmission Level
Headset Modular
Connector
5502
Figure 8-4 BHEU PCB
BHEU
To HEU connector
on telephone
Turn BHEU component
side down.
BVSU or BPCI
(optional)
5651
Red
Wire
Figure 8-5 BHEU Installation