Toshiba Strara CTX Series, Installation And Maintenance Manual, Page: 206 / 290

Station Apparatus
7-8
Strata CTX I&M September 2002
Telephone Headset (BHEU) Upgrade
The BHEU can be installed into the DKT3000/3500-series telephones to enable headset or external
ringer use. For information on connecting the external ringer, refer to
“Telephone External Ringer” on
Page 8-17 . 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 7-2 ).
2. If you are connecting an ECM or
Carbon-type headset to the BHEU,
leave the BHEU jumper in the
“AUTO” position(see
Figure 7-4 ).
“AUTO” enables the BHEU current
detector to determine which headset
type is connected (less than 2mA
detects EU 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 7-7 and 7-8 ).
5. Position the BHEU PCB (component
side down) on the standoffs inside the
base, and secure with the two provided
screws (see
Figure 7-5 ).
6. Connect the BHEU integrated wire plug
to P3 (HEU) on the telephone base PCB
(see
Figures 7-6 and 7-9 ). 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 7-9 ). Note the location of the red
wire.
7. Reinstall the base on the telephone.
BHEU1A
P 1
S W 1
S W 2
A UT O
C A R BON NOR MA L
L OW
R ED
T ransmission L evel
Headset Modular
C onnec tor
550
2
Figure 7-4 BHEU PCB
BHEU
T o HEU c onnec tor
on telephone
T urn BHEU c omponent
side down.
BV S U or BP C I
(optional)
5651
R ed
W ire
Figure 7-5 BHEU Installation