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3M A300 Installation Instructions Manual

Made by: 3M
Type: Installation Instructions
Category: Intercom System
Pages: 14
Size: 0.12 MB

 

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Audio Greeter 
Model A300 

Installation Instructions 

 

 

 

 

 

 

Package Contents 

Quantity Description 

Model A300 Audio Greeter, Part No. 78-9236-6457-3 

Power Supply; +12 VDC @ 800 mA, Plug-in, Part No. 78-8095-0976-9 

Microphone; High Sensitivity Electret Condenser, 3.5 mm Stereo Plug, Part No. 78-8095-0928-7 

1 Wire 

Cover 

Installation Instructions, Part No. 78-6912-0717-5 

Operating Instructions, Part No. 78-6912-0714-2 

Operating Instructions Placard; Wall Mount, Part No. 78-6912-0721-7 

1 Warranty 

Card 

Receiving Report Card 

Please check for shipping damage.  Notify the shipping company immediately if any damage is found.  Retain all packaging and 
components for inspection by the shipping company. 

 

Introduction 

The 3M™ Audio Greeter, Model A300, is designed for use with intercom systems.  A typical application is use in a quick 
service drive-thru restaurant to play digitally stored messages through a menu speaker.   

 


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2

Installation

 

Determining the Best Location for the A300 Audio Greeter 

The A300 should be mounted on a vertical wall about 60 inches high.  If the user must bend over a countertop to 
reach the A300, then lower it to 50 inches so the user can speak directly into the on-board microphone.  
A quiet location is recommended if frequent voice recording is anticipated.  A nearby manager's office or other 
enclosed room would be ideal.  Cable runs over 35 feet should be avoided to reduce signal degradation. 

Mounting Hardware (not supplied) 

4 each, #8 screws 
4 each, wall anchors 

Mounting the A300 Audio Greeter 

Before mounting the A300 to the wall, we recommend that you attach all the cables to the A300 while it rests on a 
countertop or a chair near its mounting surface.  This allows easy access to all jumpers and controls with the cover 
open. 
1.  Remove the A300 cover and unplug the switch panel ribbon cable from the main circuit board. 
2.  Place the A300 at the desired location 50" to 60" high.  Mark the locations of the four holes in the base onto 

the mounting surface. 

3.  Using appropriate mounting hardware (not supplied), attach the A300 base to the mounting surface. 
4.  Plug the ribbon cable into the main circuit board and attach the cover. 
5.  Clean the left-hand side of the cover with denatured alcohol and attach the external microphone holder using 

the double-stick tape provided. 

6.  Attach the wire cover to the right side of the A300 using the screws provided. 

 

!

 Important 

If it is necessary to operate the A300 with the cover removed while it is 
mounted on a vertical wall, do not allow the cover to hang from the switch 
panel ribbon cable.  The cover may rest on the top edge of the base plate, 
but make sure it doesn't fall off.  

Installation Diagrams 

Figure 1.  “Installing the A300 Audio Greeter with the 3M D-15 Intercom” 

Figure 2.  “Installing the A300 Audio Greeter with the 3M Interconnect Module” 

Figure 3.  “Installing the A300 Audio Greeter with the 3M C762AA/BA/C921AA Base Station” 

Figure 4.  “Installing the A300 Audio Greeter with the 3M C921BA Base Station” 

Figure 5.  “Installing the A300 Audio Greeter with the HME SYS2500D/DS/DSL Base Station” 

Figure 6.  “Installing the A300 Audio Greeter with the HME WBS2000 Base Station” 

Figure 7.  “Installing the A300 Audio Greeter with the Panasonic WX-C510/WX-C1010 Base Station” 

Figure 8.  “Optional Installation with the HME or Panasonic Base Station” 

Figure 9.  “Installing the A300 Audio Greeter with an Intercom Using an Outside Speaker/Microphone” 

Figure 10.  “Installing the A300 Audio Greeter with the 3M Sodar Vehicle Detector” 

 


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3

Configuration 

The Operating Modes and Message Delay Times of the A300 are set with jumper JMP1 and DIP switches SW2 and 
SW3 located on the circuit board.  Tables 1 and 2 list the switch settings. 

Vehicle Detect Configuration 

JMP1 
Position A
 - Position A is the default selection for most 3M Intercom installations.   
Position B - Position B is used when an optional relay must be added to trigger the A300.  An optional relay may 
be required in cases where the HME or Panasonic intercom triggers an external service timer.  (See Figure 8) 
Note:  When JMP1 is in position B, a +5Volt pull-up voltage is applied to VEH DET + (J9 terminal 8).  Then, a 
contact closure between VEH DET - (J9 terminal 9) and COM (J9 terminal 3, 6 or 11) will initiate a vehicle 
detect trigger.
 

Mode Configuration 

 

SW2  

A description of each mode follows.  Table 1 lists the DIP switch settings. 

Message 4 External Trigger 
When SW2 number 1 is ON, the fourth message can only be played to the outside menu speaker when 
triggered from MSG4TRG, connector J9-10.  The trigger signal should be a contact closure from 
MSG4TRG to COM (i.e. fire alarm, etc.). 

Automatic message Repeat 
When SW2 number 2 is ON, the selected message(s) will continuously repeat when triggered by a vehicle 
detect signal.  The message(s) will stop when the vehicle detect signal is disengaged.   
Note:  The Automatic Message Repeat will only work with a presence-type vehicle detector (i.e. Loop 
detector, Sonic detector). 

Vehicle Detect Trigger Polarity 
When SW2 number 3 is OFF, the A300 will be triggered by a positive going (low to high) vehicle detect 
signal.  When SW2 number 3 is ON, the A300 will be triggered by a negative going (high to low) vehicle 
detect signal. 

Pulse/Presence Vehicle Detector 
When SW2 number 4 is OFF, the A300 requires a presence-type vehicle detect signal (i.e. Loop detector).  
When SW2 number 4 is ON, the A300 requires a pulse-type vehicle detect signal (i.e. air switch). 

Timer Trigger Polarity 
When SW2 number 5 is OFF the TTL output at TIMER TRG, connector J9-12 will be a positive going 
(0.8V to 5.0V) signal when triggered by a vehicle detect signal.  When SW2 number 5 is ON the TTL 
output at TIMER TRG will be negative going (5.0V to 0.8V) when triggered by a vehicle detect signal. 

Music Mode 
When SW2 number 6 is ON, the A300 will play music at the menu speaker when a message is not 
playing.  The input music source must have its own balanced output power amplifier and volume control 
capable of driving the 4 – 8 ohm balanced menu speaker.  When SW2 number 6 is ON, the A300 will 
pass audio from the music source to the menu speaker.  When a vehicle triggers the A300, the music will 
be interrupted while the greeter plays its message(s).  The music will resume playing at the menu speaker 
2 minutes after the vehicle detect signal is disengaged.  Note:  Use this feature only with the 3M C921BA 
Base Station.
  

Menu Microphone Mute 
When SW2 number 8 is ON, the inbound audio from the Menu Microphone will be muted while the 
A300 plays message(s) to the Menu Speaker.  The message(s) can only be heard if the A300 AUDIO OUT 
line is connected to the C760/C960 AUDIO IN line (use AUDIO OUT potentiometer on A300 to adjust 
message volume)
.  When SW2 number 8 is OFF, in full duplex operation, the A300 message will be heard 
through the menu microphone while the message is being played through the menu speaker. 
 
 

 


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4

Position 
Number 

ON Position 

OFF Position 

Message 4 External Trigger  Activated 

* Message 4 External Trigger Deactivated 

Automatic Message Repeat ON 

* Automatic Message Repeat OFF 

Vehicle Detect Trigger Polarity Negative 

* Vehicle Detect Trigger Polarity Positive 

Pulse Detector 

* Presence Detector 

Timer Trigger Polarity - Negative 

* Timer Trigger Polarity - Positive 

Music Mode ON 

* Music Mode Off 

Not Used 

Not Used 

Menu Microphone Mute ON 

* Menu Microphone Mute OFF 

 

* Default Factory Settings 

Table 1.  3M Audio Greeter SW2 Mode Configuration 

 
Message Delay Timer Configuration 
The message delay timer is set with SW3.  Table 2 lists the switch setting for each message delay time. 

 

Position 

Number 1 

Position 

Number 2 

Position 

Number 3 

Position 

Number 4 

Message Delay 

(Seconds) 

OFF OFF OFF OFF  0 
OFF OFF OFF  ON  1 
OFF OFF ON OFF  2 

* OFF 

* OFF 

* ON 

* ON 

* 3 

OFF ON OFF OFF  4 
OFF ON OFF ON  5 
OFF ON  ON OFF  6 
OFF ON ON ON  7 

ON  OFF OFF OFF  8 
ON OFF OFF ON  9 
ON OFF ON OFF  10 
ON OFF ON  ON  11 
ON ON OFF OFF 12 
ON  ON OFF ON  13 
ON ON ON OFF 14 
ON ON ON ON  15 

 

* Default Factory Settings 

Table 2.  3M Audio Greeter SW3 Message Delay Timer Configuration 

 

Additional Features 

______

TALK

 - This terminal is an active low input, used to cancel the current playing message.  When connected to the 

______

TALK

 output terminal on the C921BA base station, it allows the operator to remotely cancel the playing message by 

pressing and holding the headset or intercom TALK button for at least one second.  A short tap of the TALK button 
will cancel only the alert tones, allowing the message to continue and be heard in the headset/beltpack.
 

*Note 

1.   If Talk Lock IS used, you must disconnect the wire from the 

______

TALK

 terminal on the base station. 

2.  If talk Lock IS NOT used, you must connect the wire from the 

______

TALK

 terminal on the base station. 

 
AUDIO_OUT
 – This terminal is used in conjunction with the microphone mute feature, SW2 number 8.  The 
AUDIO_OUT terminal on the A300 sends the currently playing audio message to the AUDIO_IN terminal of the 
intercom so that the message from the A300 is heard in the headset or intercom if the microphone mute feature is ON.  

 


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5

System Checkout and Balancing 

The system checkout of the A300 Audio Greeter can be completed by following the steps below: 

1.  Plug the +12VDC power supply into an electrical outlet and connect power plug into J5. 

2.  Turn the power switch on.  Make sure the A300 completes its boot-up cycle.  (Each LED will flash once, then the unit 

will beep 3 times). 

3.  Press the MODE button until the RECORD light comes on.  Record a message in all four message locations. 

4.  Press the MODE button until the MONITOR light comes on.  Play each message by pressing the MESSAGE 

SELECT number button and pressing PLAY NOW button.  Also press the MONITOR VOLUME arrow buttons to 
change the volume of the messages. 

5.  Select all the messages by pressing all the MESSAGE SELECT number buttons.  Test the ALTERNATE 

MESSAGES function by pressing the ALTERNATE MESSAGES ON button and the PLAY NOW button several 
times.  Verify that each time the PLAY NOW button is pressed that the next message is played until the first message 
is played again.  While a message is playing press the CANCEL button to verify that the message stops. 

6.  Verify that the vehicle detector is operating properly by having a vehicle drive into the vehicle detection area.  The 

VEHICLE LED should illuminate when the vehicle is detected, and go off when the vehicle leaves. 

7.  Press the MODE button until the PLAY light comes on to test messages at the menu sign.  Select all the messages by 

pressing all the MESSAGE SELECT number buttons. 

8.  Stand near the outside menu sign speaker and have a vehicle drive into the vehicle detection area to verify that all the 

messages play at the speaker.  Also have someone inside the building press the PLAY NOW and CANCEL buttons to 
verify their operation. 

9.  Have the person inside press the MESSAGE DELAY ON button.  Drive the vehicle through the vehicle detection area 

and verify that the message is delayed by the correct preset delay time. 

10.  Adjust potentiometer MENU SPKR VOL, located on the left side of the A300, to control the menu sign message 

volume.  Also press the DAY/NIGHT button while playing a message to verify the night-time menu sign message 
volume. 

11.  For 3M C760/C960 Systems only.  Adjust potentiometer AUDIO OUT to set the message volume in the 

headset/intercom.   
Note:  Potentiometer AUDIO OUT is only used to set the message volume for the convenience of the headset/intercom 
operator.  Therefore, to reduce operator fatigue, adjust AUDIO OUT to set the message volume so it is barely audible 
in the headset/intercom.
 

12.  Attach the Wire Cover plate using the hardware supplied. 

13.  Attach the Operating Instructions Placard to a nearby wall, if possible, using an appropriate mounting method. 
 

 


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6

Installation Diagrams 

 

Model 478DA "D-15"

Menu Post

INTERCOM SPKR

COM

INTERCOM MIC

INTERCOM MIC

MENU SPKR

INTERCOM SPKR

9

10

8

7

6

5

4

3

2

1

COM

MENU MIC

MENU MIC

MENU SPKR

VEH DET+

COM

COM

_____

TALK

AUDIO OUT

3

4

5

6

7

2

1

8

9

10

11

12

VEH DET-

MSG4 TRIG

COM

TIMER TRIG

MENU SPKR

MENU MIC

COM

*

 VEH DET

MENU SPKR

MENU SPKR

SHIELD

MIC

MIC

J9

J10

A300 Audio Greeter

Optional Service Timer

VEHICLE

DETECTOR

RED

BLUE

BLK/BLU

BLK/WHT

BROWN

BLK/GRN

BLK/YEL

YELLOW

BLK/RED

WHITE

BLK/BRN

WHITE/ORG

RED/WHT

ORANGE

GREEN

BLK/ORG

GREEN/ORG

RED/GRN

1  MONITOR HI

7  FLEX MIC

8  FLEX MIC

10 VEH. DETECT

11 ALERT CANCEL

6  OUTSIDE MIC

4  COMMON

3  COMMON

2  MONITOR LOW

9  SHIELD

12 BUSY

13 +20 VDC

14 FOOT SW

15 MUSIC IN

5  OUTSIDE MIC

16 MUSIC IN

17 SPEAKER

18 SPEAKER

Note:
VEH DET is active high.
Set A300 vehicle detector
trigger polarity to positive.
(set SW2 number 3 OFF)
(set jumper JMP1 to A)

**

 MUSIC

 **

 MUSIC

**

 

Note:

MUSIC input requires a
balanced audio source

 

 

Figure 1.  Installing the A300 Audio Greeter with the 3M D-15 Intercom 

 

 


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7

INTERCOM SPKR

COM

INTERCOM MIC

INTERCOM MIC

MENU SPKR

INTERCOM SPKR

9

10

8

7

6

5

4

3

2

1

COM

MENU MIC

MENU MIC

MENU SPKR

VEH DET+

COM

** MUSIC

COM

_____

TALK

AUDIO OUT

3

4

5

6

7

2

1

8

9

10

11

12

VEH DET-

MSG4 TRIG

COM

TIMER TRIG

** MUSIC

Add jumper wire

*

 VEH DET SIG

J9

J10

3M A300

 Audio Greeter

3M Interconnect Module

Note:
VEH DET SIG is active
high.  Set A300 vehicle
detector trigger polarity to
positive. (set SW2 number
3 OFF)
(set jumper JMP1 to A)

Menu Post

MENU
MIC

MENU
SPKR

OSM

OUTSIDE
     MIC

SHLD

COM

MON
SPKR

10

7

6

5

4

3

2

1

8

9

TO OUTSIDE

COM

SIGNAL

+18 VDC

VEH DET

LOOP
DET

VEHICLE

DETECTOR

**

 

Note:

MUSIC input requires a
balanced audio source

 

 

Figure 2.  Installing the A300 Audio Greeter with the 3M Interconnect Module 

 


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8

C762AA/BA/C921AA Base Station

Menu Post

INTERCOM SPKR

COM

INTERCOM MIC

INTERCOM MIC

MENU SPKR

INTERCOM SPKR

9

10

8

7

6

5

4

3

2

1

COM

MENU MIC

MENU MIC

MENU SPKR

VEH DET+

COM

** MUSIC

COM

_____

TALK

AUDIO OUT

3

4

5

6

7

2

1

8

9

10

11

12

VEH DET-

MSG4 TRIG

COM

TIMER TRIG

** MUSIC

MON SPKR

COM

AUDIO OUT

ALT ALERT

MENU SPKR

MENU SPKR

SHIELD

MIC

MIC

AUDIO IN

VEH DET

ALERT OUT

COM

12V UNREG

MENU SPKR

MENU MIC

COM

* VEH DET

AUDIO IN

MENU SPKR

MENU SPKR

SHIELD

MIC

MIC

J9

J10

A300 Audio Greeter

Optional Service Timer

VEHICLE

DETECTOR

Note:
VEH DET is active high.
Set A300 vehicle detector
trigger polarity to positive.
(set SW2 number 3 OFF)
(set jumper JMP1 to A)

**

 

Note:

MUSIC input requires a
balanced audio source

 

 

Figure 3.  Installing the A300 Audio Greeter with the 3M C762AA/BA/C921AA Base Station 

 

 


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9

 

C921BA Base Station

Menu Post

INTERCOM SPKR

COM

INTERCOM MIC

INTERCOM MIC

MENU SPKR

INTERCOM SPKR

9

10

8

7

6

5

4

3

2

1

COM

MENU MIC

MENU MIC

MENU SPKR

VEH DET+

COM

** MUSIC

COM

_____

TALK

AUDIO OUT

3

4

5

6

7

2

1

8

9

10

11

12

VEH DET-

MSG4 TRIG

COM

TIMER TRIG

** MUSIC

MON SPKR

COM

AUDIO OUT

ALT ALERT

MENU SPKR

MENU SPKR

SHIELD

MIC

MIC

AUDIO IN

VEH DET

ALERT OUT

COM

MENU SPKR

MENU MIC

COM

*

 VEH DET

AUDIO IN

MENU SPKR

MENU SPKR

SHIELD

MIC

MIC

J9

J10

A300 Audio Greeter

Optional Service Timer

12V UNREG

_____

TALK

COM

_____
PAGE

________
VEH DET

_____

TALK

VEHICLE

DETECTOR

Note:
VEH DET is active high.
Set A300 vehicle detector
trigger polarity to positive.
(set SW2 number 3 OFF)
(set jumper JMP1 to A)

**

 

Note:

MUSIC input requires a
balanced audio source

 

 

Figure 4.  Installing the A300 Audio Greeter with the 3M C921BA Base Station 

 

 
 
 
 
 
 
 
 
 
 
 
 
 

 


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10

INTERCOM SPKR

COM

INTERCOM MIC

INTERCOM MIC

MENU SPKR

INTERCOM SPKR

9

10

8

7

6

5

4

3

2

1

COM

MENU MIC

MENU MIC

MENU SPKR

VEH DET+

COM

** MUSIC

COM

_____

TALK

AUDIO OUT

3

4

5

6

7

2

1

8

9

10

11

12

VEH DET-

MSG4 TRIG

COM

TIMER TRIG

** MUSIC

* VEH DET GND

RED

BLACK

SHLD

J9

J10

3M A300

 Audio Greeter

HME SYS2500D/DS/DSL

Base Station

Note:
Set SW2 number 3 OFF, set
jumper JMP1 to Position B.

Terminals 6 and 9 may also
be used for a contact-closure
connection (see Figure 7 for
reference).

Menu Post

MENU
MIC

MENU
SPKR

VEH DET SIG

RED

14

4

5

6

7

8

9

10

BLACK

WHITE

GREEN

VEH DET GND

10

9

8

7

6

11

12

5

OUTPUT

J1

J7

SHLD

13

BLACK

RED

VEHICLE

DETECTOR

GND

OUTSIDE
SPEAKER

SPKR/MIC

* VEH DET SIG

**

 

Note:

MUSIC input requires
a balanced audio
source

 

 

Figure 5.  Installing the A300 Audio Greeter with the HME SYS2500D/DS/DSL Base Station 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 


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11

INTERCOM SPKR

COM

INTERCOM MIC

INTERCOM MIC

MENU SPKR

INTERCOM SPKR

9

10

8

7

6

5

4

3

2

1

COM

MENU MIC

MENU MIC

MENU SPKR

VEH DET+

COM

** MUSIC

COM

_____

TALK

AUDIO OUT

3

4

5

6

7

2

1

8

9

10

11

12

VEH DET-

MSG4 TRIG

COM

TIMER TRIG

** MUSIC

* VEH DET GND

RED

BLACK

SHLD

J9

J10

3M A300

 Audio Greeter

**** HME WBS2000

and WBS2000A

Base Station

Note:
Set SW2 number 3 OFF, set jumper JMP1 to Position B.

Terminals 6 and 9 may also be used for a contact-closure
connection (see Figure 7 for reference). This would be the
case if the HME2000 uses an external vehicle detector.

Menu Post

MENU
SPKR

VEH DET SIG

SHIELD

SPKR

SPKR

VEH DET GND

TB1

* VEH DET SIG

**

 

Note:

MUSIC input requires
a balanced audio
source

***

 Note:

Set J5 on WBS2000
audio board to Negative:
Veh not present = open
Veh present

= short

GREEN

WHITE

BLACK

*** 

RED

****

 Note:

2000 and 2000A are half-duplex
2000D is duplex

TB1 = SPKR = mic input
TB4 = SPKR = (outbound)
(TB4) may be unlabeled

 

 

Figure 6.  Installing the A300 Audio Greeter with the WBS2000 Base Station 

 
 
 
 
 
 

 


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12

INTERCOM SPKR

COM

INTERCOM MIC

INTERCOM MIC

MENU SPKR

INTERCOM SPKR

9

10

8

7

6

5

4

3

2

1

COM

MENU MIC

MENU MIC

MENU SPKR

VEH DET+

COM

** MUSIC

COM

_____

TALK

AUDIO OUT

3

4

5

6

7

2

1

8

9

10

11

12

VEH DET-

MSG4 TRIG

COM

TIMER TRIG

** MUSIC

DET COM

*

 DET H

RED

BLACK

SHLD

J9

J10

3M A300

 Audio Greeter

Panasonic

 WX-C510/WX-C1010

Base Station

* Note:
Set SW2 number 3 OFF, set
jumper JMP1 to Position B.

Terminals 6 and 9 may also
be used for a contact-closure
connection (see Figure 7 for
reference).

Menu Post

MENU
MIC

MENU
SPKR

C

COM

GND

AC

AC

H

H

C

GND

H

H

C

MI
C

SP
/M
IC

SP

D

E

T

1

2

V

A

C

VEHICLE

DETECTOR

IN

COM

V/DET

(WX-C1010)

**

 

Note:

MUSIC input requires a
balanced audio source

 

 

Figure 7.  Installing the A300 Audio Greeter with the Panasonic WX-C510/WX-C1010 Base Station 

 
 
 
 

HME or Panasonic Base

Station

A300 Audio Greeter

VEH DET+

8

9

VEH DET-

J9

+Vcc (12 to 20VDC)

Note:  Place JMP1 in Position B

7

6

COM

Optional 12VDC

Relay

VEHICLE

DETECTOR

 

Figure 8.  Optional Installation with the HME or Panasonic Base Station 

 
 
 

 


background image

 

13

Below is an example of the A300 connected to a typical intercom using an Outside Speaker/Microphone 
(OSM): Use the appropriate vehicle detector connections to complete the installation. 

Intercom

Menu Post

INTERCOM SPKR

COM

INTERCOM MIC

INTERCOM MIC

MENU SPKR

INTERCOM SPKR

9

10

8

7

6

5

4

3

2

1

COM

MENU MIC

MENU MIC

MENU SPKR

MON SPKR

COM

MENU SPKR

MENU SPKR

SHIELD

MIC

MIC

MENU SPKR

MENU SPKR

J10

A300 Audio Greeter

Intercom

Menu Post

MON SPKR

COM

MENU SPKR

MENU SPKR

SHIELD

MIC

MIC

MENU SPKR/MIC

MENU SPKR/MIC

 

Figure 9. Installing the A300 Audio Greeter with an Intercom Using an Outside Speaker/Microphone 

 
 
 
 
 
 
 
 
 
 

 


background image

 

14

714AA SODAR

A300 Audio Greeter

VEH DET+

8

9

VEH DET-

J9

PRESENCE

4

3

GRD

Note: If 714AA contains optional relay,
         use terminals 8 and 9.

Note: If 714BA contains optional relay,
         use terminals 9 and 10.

714BA SODAR

A300 Audio Greeter

VEH DET+

8

9

VEH DET-

J9

HI

6

5

GND

 

 

Figure 10. Installing the A300 Audio Greeter with the 3M Sodar Vehicle Detector 

 
 

A300 Audio Greeter Troubleshooting Guide 

 

Problem Possible 

Cause

 

Solution

 

1.  Low outbound volume to 

the menu sign speaker. 

1.  The NIGHT STATUS light 

on. 

2.  The MENU SPKR VOL 

potentiometer is set too low. 
 

3.  Defective menu speaker or 

A300. 

1.  Press the DAY/NIGHT button until the 

NIGHT STATUS goes off. 

2.  Increase the setting of the MENU 

SPKR VOL potentiometer, located on 
the left side of the A300. 

3.  Measure resistance of speaker and 

verify that it works properly.  If not call 
for authorized service. 

2. Cannot 

record 

message. 

 
 

1.  External microphone not 

connected. 

2. External 

microphone 

defective. 
 
 

1.  Verify that external microphone plug is 

fully inserted into microphone jack J6. 

2.  Use internal microphone (internal 

microphone is automatically selected 
when external microphone is 
unplugged). 

 

 
 
 
 
 
 
 
 
 
 
 
 
 

 
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Department 

        

 

 

 

 

 

 

 

 

 

 

 

 

 

Printed in U.S.A.

 

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 3M 2002  

St. Paul, MN 55144-1000

 

 

 

 

 

 

 

 

 

 

78-6912-0717-5 Rev. G