Toshiba strata CT Installation & Maintenance Manual page 175

HHEU Upgrade Installation
H
Figure 5-13
C
Strata CT I&M Manual October 2000
To P1, HHEU
Connector of
Telephone
PCB
HHEU
HHEU Installation for Electronic Telephones
See Figures 5-1, 5-10, 5-11
1. Loosen the four captive screws on the telephone base and remove the base.
2. Using a screwdriver or other suitable tool, remove the plastic tab on the back of the base.
The HHEU modular connector for the headset will be accessed through this opening.
3. If using a V.3 or earlier HHEU1, set the SW601 switch to the HEADSET position for
HESB and/or headset connection. This switch is not on either the V.4 HHEU1 or the
HHEU2, because the operation is automatic with these subassemblies.
4. Connect either the HESC-65 or HESC-65A cable to P601 of the HHEU if the Loud
Ringing Bell option is required. Refer to
installation procedures.
5. For the V.3 or earlier HHEU1: if only the headset is connected to the HHEU, cut both
sides of the R607 resistor on the HHEU and remove the resistor to eliminate electrical
contact.
Note Do not cut the R607 resistor if connecting an HESB to the HHEU for the Loud
Ringing Bell–even if a headset is also installed on the HHEU.
...or
For the V.4 HHEU1 or the HHEU2: if only the headset is connected to the HHEU, cut
the speaker OCA strap.
Note Do not cut the speaker OCA strap if connecting an HESB to the HHEU for the loud
ringing bell–even if a headset is also installed on the HHEU.
6. Position the HHEU subassembly on the standoffs inside the base, and secure with the
two screws provided.
Component Side of HHEU
R607 (HHEU1 V.1 ~ V.3)
(HHEU1A V.1 ~V.3)
OCA (HHEU1
V.4 or HHEU2)
P601
1492
and 5-13 and follow these steps:
Chapter 6 – Peripheral Installation
Station Apparatus
SW601
for HESB
5-19