Toshiba Strata DK40 Installation & Maintenance Manual page 225

External Speaker Unit (HESB) Options
Installing the HESB Loud Speaker Amplification in Electronic
Telephones
1. On the HESB TB1 terminal block: connect a jumper between terminals 6 and 7, and
connect another jumper between terminals 5 and 8
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 5 – Station Apparatus
Note
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 A).
7. Connect terminal 4 of the HESB TB1 terminal block to pin 4 of the electronic
telephone's modular block (VOICE B).
8. Connect the customer supplied 12VDC 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 240VAC, 50Hz power source.
Important!
Make sure the AC power is within the specified limits shown in Step 9. If AC voltage is
not 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 HHEU (See
Testing the Loud Speaker Amplification Option
1. Test the AC input voltage. See Step 9, above.
2. Make an Exchange or station call to the station configured for the loud speaker
amplification. 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:
Note
Strata DK40 I&M Manual Spring 1999
Refer to the Strata DK40 Programming Manual or DK Library CD-Rom for more details.
HESB connections made in Steps 4~7 can be made with the HESB VOICE modular
jack instead of the TB1 terminal block.
Chapter 5 – Station Apparatus
Using a suitable voltmeter, measure voltage across terminals 1 (+) and 2 (-) of the
HESB TB1 terminal block. Voltage indication should be 4.5~5 VDC.
Ringing stops once the call is manually answered. There should be NO voltage
potential across terminals 1 and 2.
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 Figure
before proceeding with Step 4 for more information..
for details).
Peripheral Installation
6-12).
6-21