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

Circuit Diagram (Lot. 2~)

4MH-75A8J Service Manual

Parts Layout (Lot. 2~)

LC87F2H08AU

(Q1004)

DTC144EUA (26)

(Q1005)

Side A

2SK3973 (5V)

(Q1002)

LMV321IDCKR

(Q1003)

UA78L05A

(Q1001)

Side B

5MH-75A8J Service Manual

Parts List

DESCRIPTION VALUE V/W TOL. VXSTD P/NMFR’S DESIG VERS. LOT.REF. SIDE

C 1001 CHIP TA.CAP. 10uF 16V TEESVB21C106M8R K78120025 1- B
C 1002 CHIP CAP. 1uF 6.3V B GRM188B10J105KA01D K22084801 1- B
C 1003 CHIP CAP. 0.1uF 16V B GRM188B11C104KA01D K22124805 1- B
C 1004 CHIP CAP. 0.001uF 50V B GRM188B11H102KA01D K22174821 1- B
C 1005 CHIP TA.CAP. 4.7uF 6.3V TEESVA0J475M8R K78080017 1- B
C 1006 CHIP CAP. 0.0056uF 50V B GRM188B11H562KA01D K22174818 1- B
C 1007 CHIP CAP. 47pF 50V CH GRM1882C1H470JA01D K22174227 1- B
C 1008 CHIP CAP. 0.1uF 16V B GRM188B11C104KA01D K22124805 1- B
C 1009 CHIP CAP. 0.01uF 50V B GRM188B11H103KA01D K22174823 1- B
C 1010 CHIP CAP. 0.01uF 50V B GRM188B11H103KA01D K22174823 1- B
C 1011 CHIP TA.CAP. 4.7uF 6.3V TEESVA0J475M8R K78080017 1- B
C 1012 CHIP CAP. 15pF 50V CH GRM1882C1H150JA01D K22174215 1- B
C 1013 CHIP CAP. 15pF 50V CH GRM1882C1H150JA01D K22174215 1- B
C 1014 CHIP CAP. 0.001uF 50V B GRM188B11H102KA01D K22174821 1- B
C 1015 CHIP CAP. 0.001uF 50V B GRM188B11H102KA01D K22174821 1- B
C 1016 CHIP CAP. 0.01uF 50V B GRM188B11H103KA01D K22174823 1- B
D 1001 LED 19-213/S2C-AN1P2B/3T G2071096 1- A
D 1002 LED 19-213/S2C-AN1P2B/3T G2071096 1- A
D 1003 LED 19-213/S2C-AN1P2B/3T G2071096 1- A
D 1004 LED 19-213/S2C-AN1P2B/3T G2071096 1- A
MC1001 MIC. ELEMENT EM-100PT M3290029 1 A
MC1001 MIC. ELEMENT PF0-1055P M3290045 2- A
Q 1001 IC UA78L05ACPKE6(TAPE) G1094229 1- B
Q 1002 FET 2SK397300L G3839738 1- B
Q 1003 IC LMV321IDCKR G1093969 1- B
Q 1004 IC LC87F2H08AU-QFP-E G1094621 1- B
Q 1005 TRANSISTOR DTC144EUA T106 G3070041 1- B
Q 1006 TRANSISTOR 2SC4617 TL R G3346178R 1- B
R 1001 CHIP RES. 1k 1/16W 5% RMC1/16 102JATP J24185102 1- B
R 1002 CHIP RES. 2.2k 1/16W 5% RMC1/16 222JATP J24185222 1- B
R 1003 CHIP RES. 12k 1/16W 5% RMC1/16 123JATP J24185123 1- B
R 1004 CHIP RES. 12k 1/16W 5% RMC1/16 123JATP J24185123 1- B
R 1005 CHIP RES. 10k 1/16W 5% RMC1/16 103JATP J24185103 1- B
R 1006 CHIP RES. 39k 1/16W 5% RMC1/16 393JATP J24185393 1- B
R 1007 CHIP RES. 22k 1/16W 5% RMC1/16 223JATP J24185223 1- B
R 1008 CHIP RES. 4.7k 1/16W 5% RMC1/16 472JATP J24185472 1- B
R 1009 CHIP RES. 4.7k 1/16W 5% RMC1/16 472JATP J24185472 1- B
R 1010 CHIP RES. 680 1/16W 5% RMC1/16 681JATP J24185681 1- B
R 1011 CHIP RES. 100 1/16W 5% RMC1/16 101JATP J24185101 1- B
R 1012 CHIP RES. 0 1/16W 5% RMC1/16 000JATP J24185000 1- B
R 1013 CHIP RES. 2.2k 1/16W 5% RMC1/16 222JATP J24185222 1- B
R 1014 CHIP RES. 2.2k 1/16W 5% RMC1/16 222JATP J24185222 1- B
R 1015 CHIP RES. 1k 1/16W 5% RMC1/16 102JATP J24185102 1- B
R 1016 CHIP RES. 100k 1/16W 5% RMC1/16 104JATP J24185104 1- B
R 1017 CHIP RES. 470 1/16W 5% RMC1/16 471JATP J24185471 1- B
R 1018 CHIP RES. 100 1/16W 5% RMC1/16 101JATP J24185101 1- B
R 1019 CHIP RES. 100 1/16W 5% RMC1/16 101JATP J24185101 1- B
R 1020 CHIP RES. 100 1/16W 5% RMC1/16 101JATP J24185101 1- B
R 1021 CHIP RES. 100k 1/16W 5% RMC1/16 104JATP J24185104 1- B
R 1022 CHIP RES. 100k 1/16W 5% RMC1/16 104JATP J24185104 1- B
R 1023 CHIP RES. 100k 1/16W 5% RMC1/16 104JATP J24185104 1- B
R 1024 CHIP RES. 10k 1/16W 5% RMC1/16 103JATP J24185103 1- B
R 1025 CHIP RES. 1k 1/16W 5% RMC1/16 102JATP J24185102 1- B
R 1026 CHIP RES. 470k 1/16W 5% RMC1/16 474JATP J24185474 1- B
R 1027 CHIP RES. 2.2M 1/16W 5% RMC1/16 225JATP J24185225 1- B
R 1028 CHIP RES. 1k 1/16W 5% RMC1/16 102JATP J24185102 1- B
R 1029 CHIP RES. 2.2k 1/16W 5% RMC1/16 222JATP J24185222 1- B
R 1030 CHIP RES. 470 1/16W 5% RMC1/16 471JATP J24185471 1- B
S 1001 TACT SWITCH SKHHLVA010 N5090161 1- B
X 1001 XTAL U3B 7.3728MHz 7.3728MHZ H0103280 1- B

MIC HOLDER RUBBER
WIRE ASSY AAG22X 300MM8PC T9207464 1­WIRE ASSY GRN 70 (3)/(3) T52507012 1-

RA0183800 1-

6MH-75A8J Service Manual

Exploded View

RA1028200
HOOK

RA0824500
PLATE (HANGER)



RA0183800
MIC HOLDER RUBBER

RA0187600
SHEET (MICRO TEX 8X4)

RA1041100
FRONT CASE

RA1041300
PTT KNOB

RA0818600
RUBBER (PTT)

RA1041400
RUBBER KNOB

Q6000116
TERMINAL (B6 M4)

RA0818700
WEIGHT























RA1041200
REAR CASE





T9207464
WIRE ASSY

MAIN UNIT

REF.








VXSTD P/N

U20406002
U23316007
U24206001
U70002001
U70004002
U71004002

BINDING HEAD SCREW M4X6NI
BIND HEAD T APTITE-P M3X16B
BIND HEAD T APTITE-B M2.6X6
PLAIN WASHER FW2.6
PLAIN WASHER FW4NI
SPRING LOCK WASHER SW4NI

DESCRIPTION

Qty.

1
3
6
2
1
1

Non-designated parts are available only aspart of a designated assembly.

7MH-75A8J Service Manual