Toshiba Strata DK14 Installation And Maintenance Manual page 350

Station Apparatus
Electronic Telephone Upgrades
HHEU Upgrade Installation
See Figures 9-2, 9-12,
these steps:
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 Chapter 10– Peripheral
Installation for HESB 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.
Do not cut the speaker OCA strap if connecting an HESB to the HHEU for the loud
Note
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.
7. Connect the HHEU subassembly wire plug to the P1 connector on the electronic telephone
PCB.
8. Cut the HHEU strap on the telephone PCB.
Note The HHEU strap must be replaced if the HHEU PCB is removed from the telephone.
9. Reinstall the telephone base, and secure it with its four captive screws.
9-18
9-13 and 9-15 and follow
Component Side of HHEU
R607 (HHEU1 V.1 ~ V.3)
To P1, HHEU
Connector of
Telephone
PCB
HHEU
Figure 9-15 HHEU Installation for Electronic
Telephones
SW601
(HHEU1A V.1 ~V.3)
OCA (HHEU1
V.4 or HHEU2)
P601
1492
Strata DK I&M 5/99