Toshiba CTX28 用户手册

External Speaker Unit (HESB) Options

1. Test the AC input voltage by plugging power cord into the power supply and to a 

115VAC±10VAC to 12VDC power source.

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 
TB1 terminal block. Voltage indication should be 4.5~5VDC.

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).

The amplified speaker option enables the HESB to be configured as a paging speaker. The HESB 
is connected to the BIOU 600-ohm page output to provide an amplified external speaker.

³

1. Connect a jumper between terminals 1 and 2 of the HESB TB1 terminal block (see 

). 

2. Connect a jumper between terminals 6 and 7 of the HESB TB1 terminal block.

3. Connect a jumper between terminals 5 and 8 of the HESB TB1 terminal block.

4. Connect a jumper between terminals 3 and 4 of the HESB TB2 terminal block.

5. Connect a jumper between terminals 5 and 6 of the HESB TB2 terminal block. 

6. Connect the BIOU or ACTU 600-ohm page output (pins 13 and 38) to terminals 3 and 4 of the 

HESB TB1 terminal block.

7. Connect the power supply’s +12V lead to terminal 1 of the HESB TB2 terminal block, and 

connect the 0V lead to terminal 2.

8. Plug the provided power cord into the power supply and to a 115VAC±10VAC to 12VDC 

power source.

9. Set the BIOU SW600 switch to the SPO position.