Vertex Standard MH-66A4B User manual

1MH-66A4B/A7A/B7A Service Manual
Specifications
Microphone Impedance: 2.2k-ohm at 1 kHz
Speaker Impedance: MH-66A4B: 4-ohm, MH-66A7A/B7A: 16-ohm
Speaker Input: max. 0.6W
Weight (approx.): 170g
The MH-66 is a Speaker Microphone designed especially for Vertex Standard transceivers*.
*:Check with the latest Vertex Product Catalog for a list of the transceivers that can be used with each version.
MH-66A4B/A7A MH-66B7A
Connector Pinout Diagram
Service Manual
SPEAKER MICROPHONE
MH-66A4B/A7A/B7A
Vertex Standard LMR, Inc.
4-8-8 Nakameguro, Meguro-Ku
Tokyo 153-8644, Japan
©2012 Vertex Standard LMR, Inc.
EAE46X90F
MH-66A7A/B7A MH-66A4B
Pin 5 (Select)
Pin 3 (GND)
Pin 1 (Speaker +)
Pin 8 (5.0V)
Pin 6 (PTT)
Pin 4 (MIC)
Pin 2 (Speaker --)
NC Speaker (--), GND
Speaker (+) MIC

2MH-66A4B/A7A/B7A Service Manual
Exploded View
2
2
4
4
Qty.Ref. VXSTD P/N Description
U9900094
U24206002
U9900197
U9900196
TAPTITE SCREW M2X5NI#2
TAPTITE SCREW M2.6X6NI
TAPTITE SCREW 2.6X10SUS
TAPTITE SCREW 2.6X6SUS
①
②
③
④
RA079300A (MH-66A4B/A7A)
RA079290A (MH-66B7A)
FRONT CASEASSY (W/ SP NET, NAME PLATE)
RA077510A
MIC HOLDER RUBBER (F)
RA0774500
SUPPORT
RA077440A
RUBBER KNOB
RA0774600
REAR CASE
RA0775900
O RING (CASE)
RA0774700
COIL SPRING
RA0774300
LEVER
RA0538200
STOPPER PLATE
RA0317000
SHEET
RA0817400
O RING
U81053020
STOP RING ETW-4 RA0663200 (MH-66A7A/B7A)
RA066320A (MH-66A4B)
RUBBER PACKING
RA0186000
WASHER
RA018250A
CAP (EAR)
RA0775200
MIC HOLDER RUBBER (R)
RA0775000 (x2 pcs)
RUBBER KNOB (MH-66B7A)
RA0776200
RUBBER PACKING
MH-66B7A
RA0775800
SHEET
RA0776000
O RING (x4 pcs)
M4090214 (MH-66A4B)
M4090181(MH-66A7A/B7A)
SPEAKER
M3290033
MIC. ELEMENT
P1090861
CONNECTOR
MIC-UNIT
①
④
①
②
②
③
③
③
③④
④
④
Non-designated parts are available only as part of a designated assembly.
This metal fittings are at-
tached to CONNECTOR
P1090861 .
CP8564002
BELT CLIPASSY
T9207547 (MH-66A4B)
WIRE ASSY
U20213020 (x2 pcs)
BINDING HEAD SCREW (M2.6X13SUS)
T9207293A (MH-66A7A/B7A)
WIRE ASSY (W/ SPECIAL SCREW)
S8002230
SPECIAL SCREW (SHORT)
S8002229
SPECIAL SCREW (LONG)

3MH-66A4B/A7A/B7A Service Manual
MH-66A7A Circuit Diagram (Lot. 1 ~ 93)
MH-66B7A Circuit Diagram (Lot. 1 ~ 93)

4MH-66A4B/A7A/B7A Service Manual
MH-66A4B Circuit Diagram
MH-66A7A/B7A Circuit Diagram (Lot. 94 ~)

5MH-66A4B/A7A/B7A Service Manual
MH-66A7A/B7A Parts Layout (Lot. 1 ~ 13)
Side B
Side A




: These parts have installed only the microphone of "MH-66B7A".

6MH-66A4B/A7A/B7A Service Manual
MH-66A7A/B7A Parts Layout (Lot. 14 ~ 93)
Side B
Side A
: These parts have installed only the microphone of "MH-66B7A".







7MH-66A4B/A7A/B7A Service Manual
MH-66A4B Parts Layout
MH-66A7A/B7A Parts Layout (Lot. 94 ~)
Side B
Side A
: These parts have installed only the microphone of "MH-66B7A".







8MH-66A4B/A7A/B7A Service Manual
*** MIC-UNIT ***
C 1005 TANTALUM CAP. 10uF 16V TPDN1C100M8S(MX0) K76120019 11-13
C 1005 CHIP TA.CAP. 10uF 16V TEESVA1C106M8R K78120077 14-
R 1001 CHIP RES. 0 1/2W 5% RMC1/2 JPATE J24275000 A4B/A7A 1-
R 1001 CHIP RES. 68 1/2W 5% RMC1/2 680JCTP J24275680 B7A 1-
R 1002 CHIP RES. 8.2k 1/10W 5% RMC1/10T 822J J24205822 1-
R 1002 CHIP RES. 2.2k 1/10W 5% RMC1/10T 222J J24205222 A4B 1-
R 1004 CHIP RES. 22k 1/10W 5% RMC1/10T 223J J24205223 B7A 1-
R 1005 CHIP RES. 27k 1/10W 5% RMC1/10T 273J J24205273 1-33
R 1005 CHIP RES. 27k 1/16W 5% RMC1/16S 273JTH J24189042 34-
R 1006 CHIP RES. 2.2k 1/10W 5% RMC1/10T 222J J24205222 A7A/B7A 1-
R 1006 CHIP RES. 0 1/10W 5% RMC1/10T 000J J24205000 A4B 1-
R 1007 CHIP RES. 6.8k 1/10W 5% RMC1/10T 682J J24205682 B7A 1-
R 1008 CHIP RES. 0 1/4W 5% RMC1/4 000JATP J24245000 14-
R 1009 CARBON FILM RES. 1k 1/6W 5% RD16TPJ102 1K J07225102 11-13
R 1009 CHIP RES. 1k 1/10W 5% RMC1/10T 102J J24205102 14-40
R 1009 CHIP RES. 1k 1/10W 5% RMC1/10T 102J J24205102 41-
R 1010 CHIP RES. 2.2k 1/16W 5% RMC1/16 222JATP J24185222 A4B 1-100
R 1010 CHIP RES. 2.2k 1/16W 5% RMC1/16S 222JTH J24189029 A4B 101-
S 1001 TACT SWITCH SKRDLBA010 N5090148 1-
S 1002 TACT SWITCH SKQYPAE010 N5090144 B7A 1-
S 1003 TACT SWITCH SKQYPAE010 N5090144 B7A 1-
S 1005 TOGGLE SWITCH ATE1D-6M3-14-Z N2090077 B7A 1-
HOLDER PLATE (TGL) RA0207700 B7A 1-
*** MAIN-ASSY ***
C 0001 CHIP CAP. 0.001uF 50V B GRM40B102M50PT K22170805 1-
J 0001 CONNECTOR HSJ1857-016220 P1090861 1-
JP0001 WIRE ASSY RED 30 (3)/(3) T51203012 1-
JP0002 WIRE ASSY BLK 30 (3)/(3) T51003012 1-
JP0003 WIRE ASSY RED 50 (3)/(3) T51205012 1-
JP0004 WIRE ASSY BLK 50 (3)/(3) T51005012 1-
JP0005 WIRE ASSY ORG 50 (3)/(3) T51305012 1-
JP0006 WIRE ASSY BLU 50 (3)/(3) T51605012 1-
MC0001 MIC. ELEMENT EM-114 M3290033 1-
P 0001 WIRE ASSY AAE46X007 T9207547 A4B/A7A 94-
P 0001 WIRE ASSY KP-281-F1-7P T9207293 B7A 1-54
P 0001 WIRE ASSY KP-281-F1-7P T9207293A B7A 55-
P 0002 WIRE ASSY KP-281-F1-7P T9207293 A7A 1-54
P 0002 WIRE ASSY KP-281-F1-7P T9207293A A7A 55-
SP0001 SPEAKER 4-ohm A-S0000036-004 M4090192B A4B 94-107
SP0001 SPEAKER 4-ohm 36N-D2114B M4090214 A4B 108-
SP0001 SPEAKER 16-ohm 300891 0.5W/16-OHM M4090141 A7A/B7A 1-8
SP0001 SPEAKER 16-ohm AC033 0.5W/16-OHM M4090181 A7A/B7A 9-
Parts List
DESCRIPTION VALUE V/W TOL. VXSTD P/NMFR’S DESIG VERS. LOT.REF. SIDE LAYADR