Toshiba STRATA DK14 Installation And Maintenance Manual page 529

Installing the HESB Loud Ringing Bell in Electronic Telephones (DK40i and DK424 Only)
1. On the HESB TB1 terminal block: connect a jumper between terminals 6 and 7, and connect
another jumper between terminals 5 and 8 (see
2. On the HESB TB2 terminal block, connect a jumper between terminals 4 and 5.
3. Install an HHEU PCB and HESC-65A (or HESC-65A) cable in the telephone per Chapter 11 –
Station Apparatus before proceeding with
HESB connections made in
Note
instead of the TB1 terminal block.
4. Connect terminal 1 of the HESB TB1 terminal block to the red (+) wire of the HESC-65 cable
using a modular block.
5. Connect terminal 2 of the HESB TB1 terminal block to the green (-) wire of the HESC-65
cable using a modular block.
6. Connect terminal 3 of the HESB TB1 terminal block to pin 3 of the electronic telephone's
modular block (VOICE TIP).
7. Connect terminal 4 of the HESB TB1 terminal block to pin 4 of the electronic telephone's
modular block (VOICE RING).
8. Connect the HACU-120 power supply's +12V lead to terminal 1 of the HESB TB2 terminal
block, and connect the power supply's 0V lead to terminal 2.
9. Plug power cord into the power supply and to a 115VAC±10VAC, 60Hz power source.
Important!
Make sure the AC power is within the specified limits shown in Step 9. If AC voltage is not
G
within range, have a qualified electrician correct the problem.
Cut the EX-SP and HHEU straps on telephones and do not cut the OCA strap or R607 on the
G
HHEU (see Chapter 11 – Station Apparatus
Testing the Loud Ringing Bell Option
1. Test the AC input voltage. See Step 9, above.
2. Make a CO or station call to the station configured for the loud ringing bell. Ringing will be
heard over the HESB.
3. Use a small, slotted screwdriver to turn the volume control on the back of the HESB to the
desired level and adjust the ring volume control on the telephone.
4. If ringing is heard at the station, but not over the HESB, check the following while the station
is ringing:
Using a suitable voltmeter, measure voltage across terminals 1 (+) and 2 (-) of the HESB
o
TB1 terminal block. Voltage indication should be 4.5~5VDC.
Ringing stops once the call is manually answered. There should be NO voltage potential
Note
across terminals 1 and 2.
o If voltage is not as specified during ringing, check that the telephone wiring connections to
the HESB have been made properly (wires to terminals 1 and 2 of the HESB TB1 terminal
block may have been reversed).
See
Important!
jumpers on the electronic telephone main PCB.
Strata DK I&M 6/00
Steps 4~7
Chapter 11 – Station Apparatus
External Speaker Unit (HESB) Options
Figure 12-12).
Step 4.
can be made with the HESB VOICE modular jack
for details).
for instructions to cut EXSP and HHEU
Peripheral Installation
12-21