Vertex Standard MH-75A8J Service Manual

16-K

EYPAD/DTMF MICROPHONE

MH-75A8J

Service Manual

Vertex Standard LMR, Inc.

4-8-8 Nakameguro, Meguro-Ku

Tokyo 153-8644, Japan

©2012 Vertex Standard LMR, Inc.

EAG22X90A

The MH-75

A8J

is a 16-Keypad/DTMF Microphone designed especially for Vertex Standard transceivers.

 Please refer to the Vertex Standard products catalog for the correct microphone for the trans-

ceiver you are using

2

1

5

4

8

7

0

A

3

B

6

C

9

D

Specifications

Mic Element: Electret Condenser

Mic Impedance: 600 Ohm

Operating Voltage Range: 8 to 9 V DC

Current Drain (Approx.): 20 mA

Operating Temperature Range: –22 °F to +140 °F (–30 °C to +60 °C)

Weight (Approx.): 7 oz. (200 g)

1MH-75A8J Service Manual

Circuit Diagram (Lot. 1)

2MH-75A8J Service Manual

Parts Layout (Lot. 1)

LC87F2H08AU

(Q1004)

DTC144EUA (26)

(Q1005)

Side A

2SK3973 (5V)

(Q1002)

LMV321IDCKR

(Q1003)

UA78L05A

(Q1001)

Side B

3MH-75A8J Service Manual