Wheelock PRM-150 Installation Instructions Download Page 4

P81537 G 

Sheet 4 of 5 

 

PRE-AMP

-2
4

V

T-
IN

R-
IN

GND

R-
OUT

T-
O

U

T

1    2    3    4    5    6

TO 24VDC

POWER SUPPLY

INPUT TO

AUDIO 

SOURCE

OUTPUT TO

 SPEAKER

AMPLIFIERS

 

 

Figure 7: 

Simplified Schematic And Connection Diagram 

 
 
OPERATION: 

 
1. 

Set PRM-150 volume control to position #5. 

 

2. 

Adjust each Speaker Amplifier's volume control to the desired volume level. 

 

3. 

If the desired volume level cannot be obtained at any or all speaker-amplifiers, then: 

 

(A)  Increase the PRM-150 volume control setting until the desired volume level is obtained at the speaker-amplifier(s) which 

had the least volume. 

 

(B)  Readjust the other Speaker Amplifier volume controls, as required. 

 
 

TROUBLE SHOOTING: 

 
CONDITION CHECK 
 
1.  No audio output to Speaker Amplifiers. 

1.  Volume control turned up (clockwise). 

 
 

2.  Check presence and polarity of -24VDC and GND. 

 
 

3.  Check audio presence and level on T-OUT and R-OUT at PRM-150, 

and if necessary also at the Speaker Amplifiers. 

 
 

4.  Check audio presence and level on T-IN and R-IN at PRM-150, and if 

necessary at the audio source. 

 
 

5.  Defective unit - Replace. 

 
 

ANY MATERIAL EXTRAPOLATED FROM THIS DOCUMENT OR FROM WHEELOCK MANUALS OR OTHER 
DOCUMENTS DESCRIBING THE PRODUCT FOR USE IN PROMOTIONAL OR ADVERTISING CLAIMS, OR FOR 
ANY OTHER USE, INCLUDING DESCRIPTION OF THE PRODUCT'S APPLICATION, OPERATION, INSTALLATION 
AND TESTING IS USED AT THE SOLE RISK OF THE USER AND WHEELOCK WILL NOT HAVE ANY LIABILITY 
FOR SUCH USE. 

 

Summary of Contents for PRM-150

Page 1: ...ities equipment and operations procedures where such action is reasonably required in the operation of its business and is not inconsistent with the rules and regulations of the Federal Communications Commission Do not attempt to repair or modify this equipment Repairs to this product will be performed by Wheelock Inc 273 Branchport Ave Long Branch NJ 07740 in accordance with Wheelock s Inc publis...

Page 2: ...1 ZONE 3 R T Figure 3 One way paging with a Wheelock ZC 3 Zone Control When connecting over 10 amplified speakers to the ZC 3 it may be necessary to connect Wheelock PRM 150 line preamplifiers to the zone outputs Depending upon system configuration i e quantity of speakers length of wire runs and audio output level of the host telephone system it may also be necessary to use PRM 150 s with less th...

Page 3: ...ms SPECIFICATIONS Table 1 Nominal Input Voltage 24VDC Input Voltage Range 18VDC to 28VDC Maximum Input Current at 24VDC 35mA Audio Input Level T IN and R IN 15dBM 0 1V RMS TO 10dBM 2 4V RMS Input Impedance 600 Ohms Output Impedance 4 Ohms Output Gain T OUT and R OUT 0 to 15dBM Maximum into 4 Ohm Load Output Drive Capability 150 Speaker Amplifiers Maximum Frequency Response 70Hz to 14kHz INSTALLATI...

Page 4: ...er Amplifier volume controls as required TROUBLE SHOOTING CONDITION CHECK 1 No audio output to Speaker Amplifiers 1 Volume control turned up clockwise 2 Check presence and polarity of 24VDC and GND 3 Check audio presence and level on T OUT and R OUT at PRM 150 and if necessary also at the Speaker Amplifiers 4 Check audio presence and level on T IN and R IN at PRM 150 and if necessary at the audio ...

Page 5: ...DAMAGE RESULTING FROM MISAPPLICATION IMPROPER SPECIFICATION ABUSE ACCIDENT OR OTHER OPERATING CONDITIONS BEYOND WHEELOCK S CONTROL WHEELOCK DOES NOT WARRANT THAT THE OPERATION OF THE SOFTWARE WILL BE UNINTERRUPTED OR ERROR FREE OR THAT THE SOFTWARE WILL MEET ANY OTHER STANDARD OF PERFORMANCE OR THAT THE FUNCTIONS OR PERFORMANCE OF THE SOFTWARE WILL MEET THE USER S REQUIREMENTS WHEELOCK SHALL NOT B...

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