DOWNLOAD Panasonic KX-NCP500UA Service Manual ↓ Size: 5.18 MB | Pages: 127 in PDF or view online for FREE

Model
KX-NCP500UA
Pages
127
Size
5.18 MB
Type
PDF
Document
Service Manual
Brand
Device
PBX / PURE IP-PBX
File
kx-ncp500ua.pdf
Date
PREV: Panasonic KX-NCP500RU (serv.man3) Service Manual / Supplement

Panasonic KX-NCP500UA Service Manual ▷ View online

121
     KX-NCP500UA
13.18. Back Board
13.18.1. No.1
(1)
(2)
(3)
KX-NCP500
UA SCHEMATIC DIAGRAM No.1 (1/2)
C
E
B
A
D
F
3
4
2
1
5
nLOS
Reserve-A35
Reserve-A33
EC_AD[12]
DC_ALM
Reserve-B32
Reserve-B35
nVM_DHW
EC_AD[14]
EC_AD[13]
Reserve-B33
EC_AD[0]
RINGER_AC
EC_nINT
EC_AD[15]
DIAG_R
nVM_UHW
EC_AD[2]
nBATT
CT_D[0]
EC_nCDET
EC_nCBE[1]
Reserve-B36
EC_AD[4]
nFAN_ALM
CT_D[2]
CT_D[1]
EC_nRST
Reserve-B37
EC_AD[6]
+30V
EC_CLK
CT_D[3]
EC_AD[1]
CT_D[4]
EC_AD[8]
+30V
CT_D[5]
RINGER
EC_nTRDY
EC_AD[10]
EC_AD[3]
CT_D[6]
RING_SYNC
EC_nFRAME
nHALT
CT_NETREF
EC_AD[5]
EC_nCBE[0]
EC_nSTOP
CT_FRAME
EC_AD[7]
Reserve-A31
EC_AD[5]
CT_D[7]
EC_AD[9]
Reserve-A32
CT_C8
EC_nPERR
AC_ALM
Reserve-B31
EC_AD[11]
EC_PAR
DIAG_T
nVM_FH
MASTER/nS
nVM_CLK
nCS_SYNC_B
CTS1
RXD1
nLEDALM
DSR
DCD1
DTR
nLEDRUN
TXD1
RTS1
RINGER
RING_SYNC
nHALT
nLOS
AC_ALM
nFAN_ALM
DC_ALM
CT_NETREF
CT_FRAME
CT_D[6]
CT_D[7]
CT_D[4]
CT_D[5]
CT_D[2]
CT_D[3]
CT_D[0]
CT_D[1]
EC_nINT
CT_C8
EC_nCDET
EC_CLK
EC_AD[14]
EC_nTRDY
EC_AD[15]
EC_nSTOP
EC_AD[12]
EC_nFRAME
EC_AD[13]
EC_nPERR
EC_AD[10]
EC_nCBE[0]
EC_AD[11]
EC_PAR
EC_AD[8]
EC_nRST
EC_AD[9]
EC_nCBE[1]
EC_AD[6]
EC_AD[1]
EC_AD[7]
EC_AD[0]
EC_AD[4]
EC_AD[3]
EC_AD[5]
EC_AD[2]
nCS_SYNC_B
+40V
+15V
+15VPT
+15VPT
+3.3V
CN102
A2
B2
A3
B3
A4
B4
A5
B5
A6
B6
A7
B7
A8
B8
A9
B9
A10 B10
A11 B11
A12 B12
A13 B13
A14 B14
A15 B15
A16 B16
A17 B17
A18 B18
A19 B19
A20 B20
A21 B21
A22 B22
A23 B23
A24 B24
A25 B25
A26 B26
A27 B27
A28 B28
A29 B29
A30 B30
A31 B31
A32 B32
A33 B33
A34 B34
A35 B35
A36 B36
A37 B37
A38 B38
A39 B39
A40 B40
A41 B41
A42 B42
A43 B43
A44 B44
A45 B45
A1
B1
CN100
A1
RINGER
B1
nCS_SYNC_B
A2
RING_SYNC
A3
GND
A4
GND
B4
GND
A5
nLOS
B5
AC_ALM
B2
nHALT
B3
GND
A6
nFAN_ALM
B6
DC_ALM
A7
CT_NETREF
B7
CTS1
A8
CT_FRAME
B8
RXD1
A9
CT_D[6]
B9
nLEDALM
A10
CT_D[7]
B10
DSR
A11
GND
B11
GND
A12
GND
B12
GND
A13
CT_D[4]
B13
+3.3V
A14
CT_D[5]
B14
DCD1
A15
CT_D[2]
B15
DTR
A16
CT_D[3]
B16
nLEDRUN
A17
CT_D[0]
B17
TXD1
A18
CT_D[1]
B18
RTS1
A19
GND
B19
GND
A20
GND
B20
GND
A21
EC_nINT
B21
CT_C8
A22
EC_nCDET
B22
EC_CLK
A23
EC_AD[14]
B23
EC_nTRDY
A24
EC_AD[15]
B24
EC_nSTOP
A25
EC_AD[12]
B25
EC_nFRAME
A26
EC_AD[13]
B26
EC_nPERR
A27
EC_AD[10]
B27
EC_nCBE[0]
A28
EC_AD[11]
B28
EC_PAR
A29
EC_AD[8]
B29
EC_nRST
A30
EC_AD[9]
B30
EC_nCBE[1]
A31
EC_AD[6]
B31
EC_AD[1]
A32
EC_AD[7]
B32
EC_AD[0]
A33
EC_AD[4]
B33
EC_AD[3]
A34
EC_AD[5]
B34
EC_AD[2]
A35
+15VPT
B35
POWERGND
A36
+15V
B36
+40V
A37
+15VPT
B37
POWERGND
A38
+15V
B38
+40V
A39
+15VPT
B39
POWERGND
A40
+15V
B40
POWERGND
+15VPT
+40V
+15V
+3.3V
DG
DG
PG
PG
PG
DG
J105
0
J104
0
DG
J109
0
FG
J108
0
J107
0
J106
0
J103
0
J102
0
J101
0
J100
0
C100
0.1u
+15VPT
+15V
+3.3V
+40V
C101
0.1u
C102
0.1u
C103
0.1u
C104
0.1u
DG
C111
0.1u
DG
C110
0.1u
C112
0.1u
C113
0.1u
C114
0.1u
C120
0.1u
DG
C119
0.1u
C121
0.1u
C122
0.1u
C123
0.1u
C127
0.1u
DG
C126
0.1u
C128
0.1u
C129
0.1u
C130
0.1u
C106
0.1u
C107
0.1u
C108
0.1u
C109
0.1u
C105
0.1u
C124
0.1u
C125
0.1u
C118
0.1u
C115
0.1u
C116
0.1u
C117
0.1u
C131
0.1u
C132
0.1u
C133
0.1u
C134
0.1u
C135
0.1u
PG
C138
0.1u
C139
0.1u
C137
0.1u
C136
0.1u
DG
C142
0.1u
C140
0.1u
C141
0.1u
+40V
PG
C143
220uF
C144
220uF
RFS2
POWERTYPE[0]
POWERTYPE[1]
IPCMPR(CN104)
RFS1(CN103)
RFS2(CN102)
CN100
122
KX-NCP500UA
(1)
(2)
(3)
KX-NCP500
UA SCHEMATIC DIAGRAM No.1 (2/2)
6
8
7
EC_nPERR
EC_nTRDY
EC_AD[14]
CT_C8
RINGER
Reserve-A32
CT_D[5]
Reserve-B35
EC_AD[9]
+30V
CT_D[7]
EC_AD[8]
EC_AD[4]
CT_D[4]
Reserve-A31
EC_AD[1]
CT_D[3]
EC_CLK
+30V
EC_AD[6]
Reserve-B32
Reserve-B37
EC_nRST
DC_ALM
CT_D[1]
EC_AD[12]
CT_D[2]
Reserve-A33
nFAN_ALM
Reserve-A35
EC_AD[7]
EC_AD[4]
nLOS
CT_FRAME
Reserve-B36
EC_nSTOP
EC_nCBE[1]
EC_nCBE[0]
EC_nCDET
CT_D[0]
nBATT
EC_AD[5]
EC_AD[2]
CT_NETREF
nHALT
DIAG_R
EC_nFRAME
EC_AD[15]
EC_nINT
RING_SYNC
RINGER_AC
EC_PAR
EC_AD[0]
EC_AD[11]
CT_D[6]
Reserve-B33
Reserve-B31
EC_AD[3]
AC_ALM
EC_AD[10]
EC_AD[13]
DIAG_T
EC_AD[10]
CT_D[7]
CT_D[3]
CT_C8
EC_AD[11]
EC_AD[12]
CT_D[5]
EC_AD[14]
+30V
EC_AD[4]
EC_nINT
nLOS
EC_nCBE[1]
CT_D[2]
CT_D[0]
EC_nRST
CT_D[4]
EC_CLK
EC_nFRAME
CT_D[6]
CT_D[1]
EC_nTRDY
EC_AD[6]
EC_AD[1]
EC_nCBE[0]
nHALT
CT_NETREF
EC_AD[3]
RING_SYNC
EC_AD[8]
EC_nSTOP
CT_FRAME
DIAG_T
EC_nCDET
DIAG_R
EC_AD[5]
RINGER_AC
EC_PAR
RINGER
EC_AD[7]
EC_AD[0]
EC_AD[13]
nFAN_ALM
EC_AD[9]
EC_AD[2]
EC_AD[15]
EC_AD[11]
+30V
nVM_CLK
nVM_FH
nVM_UHW
nVM_DHW
RXD1
CTS1
DSR
nLEDALM
DCD1
nCS_SYNC_B
TXD1
RTS1
DTR
nLEDRUN
nVM_CLK
nVM_FH
MASTER/nS
nVM_UHW
nVM_DHW
nBATT
AC_ALM
DC_ALM
MASTER/nS
MASTER/nS
nCS_SYNC_B
EC_nPERR
+40V
+15V
+15VPT
+15VPT
+3.3V
+15VPT
+15V
+40V
+15VPT
+3.3V
CN103
A2
B2
A3
B3
A4
B4
A5
B5
A6
B6
A7
B7
A8
B8
A9
B9
A10
B10
A11
B11
A12
B12
A13
B13
A14
B14
A15
B15
A16
B16
A17
B17
A18
B18
A19
B19
A20
B20
A21
B21
A22
B22
A23
B23
A24
B24
A25
B25
A26
B26
A27
B27
A28
B28
A29
B29
A30
B30
A31
B31
A32
B32
A33
B33
A34
B34
A35
B35
A36
B36
A37
B37
A38
B38
A39
B39
A40
B40
A41
B41
A42
B42
A43
B43
A44
B44
A45
B45
A1
B1
CN104
A2
B2
A3
B3
A4
B4
A5
B5
A6
B6
A7
B7
A8
B8
A9
B9
A10 B10
A11 B11
A12 B12
A13 B13
A14 B14
A15 B15
A16 B16
A17 B17
A18 B18
A19 B19
A20 B20
A21 B21
A22 B22
A23 B23
A24 B24
A25 B25
A26 B26
A27 B27
A28 B28
A29 B29
A30 B30
A31 B31
A32 B32
A33 B33
A34 B34
A35 B35
A36 B36
A37 B37
A38 B38
A39 B39
A40 B40
A41 B41
A42 B42
A43 B43
A44 B44
A45 B45
A1
B1
DG
DG
DG
DG
PG
PG
PG
PG
DG
DG
R101
NC
R102
0
C
E
B
A
D
F
IPCMPR
RFS1
MASTER/nS
1
1
0
0
M/nS
0
1
1
0
POWERTYPE[1:0]
00
00
00
00
MODEL
NCP500
NCP1000
NCP3000
-
POWERTYPE[0]
POWERTYPE[0]
POWERTYPE[1]
POWERTYPE[1]
For Debug
For Debug
M/nS
123
     KX-NCP500UA
13.18.2. No.2
KX-NCP500
UA SCHEMATIC DIAGRAM No.2 (1/2)
(1)
C
E
B
A
D
F
3
4
2
1
5
CT_D[6]
CT_D[7]
CT_D[5]
EC_AD[2]
EC_nRST
CT_D[6]
EC_nCBE[1]
CT_D[5]
EC_nCBE[0]
CT_D[4]
EC_AD[9]
EC_PAR
CT_D[3]
EC_nFRAME
CT_D[2]
EC_AD[13]
EC_nPERR
EC_CLK
EC_nSTOP
EC_nTRDY
EC_nINT
RING_SYNC
EC_AD[15]
RINGER
EC_AD[14]
nLOS
CT_D[7]
EC_AD[12]
EC_AD[11]
EC_AD[10]
CT_D[0]
EC_AD[8]
EC_AD[7]
EC_AD[6]
EC_AD[5]
EC_AD[4]
CT_FRAME
EC_AD[3]
EC_nCDET
CT_D[1]
CT_C8
EC_AD[1]
CT_NETREF
EC_AD[0]
EC_nCDET
EC_nINT
EC_nSTOP
EC_nTRDY
EC_nPERR
EC_nFRAME
EC_PAR
EC_nCBE[0]
EC_nCBE[1]
EC_nRST
EC_AD[14]
EC_AD[7]
EC_AD[3]
EC_AD[9]
EC_AD[8]
EC_AD[13]
EC_AD[12]
EC_AD[2]
EC_AD[0]
EC_AD[1]
EC_AD[5]
EC_AD[4]
EC_AD[15]
EC_AD[10]
EC_AD[6]
EC_AD[11]
CT_D[4]
CT_D[3]
CT_D[2]
CT_D[1]
CT_D[0]
CT_NETREF
CT_C8
CT_FRAME
EC_CLK
EC_nSTOP
EC_AD[8]
EC_nFRAME
CT_D[6]
CT_FRAME
EC_AD[0]
nLOS
RINGER
EC_nRST
EC_AD[3]
EC_nCBE[1]
EC_AD[10]
RING_SYNC
CT_NETREF
EC_AD[14]
CT_D[1]
EC_nPERR
CT_D[2]
EC_nCBE[0]
CT_D[4]
CT_D[0]
EC_AD[1]
EC_AD[12]
EC_AD[7]
EC_AD[13]
EC_AD[2]
EC_PAR
EC_CLK
EC_nCDET
CT_D[3]
EC_nTRDY
EC_nINT
EC_AD[6]
EC_AD[9]
CT_D[5]
EC_AD[11]
CT_C8
EC_AD[5]
EC_AD[15]
EC_AD[4]
CT_D[7]
EC_AD[1]
EC_AD[2]
nHALT
nCS_SYNC_B
nHALT
nCS_SYNC_B
R241
NC
R277
NC
R213
NC
R285
NC
R267
NC
R231
NC
R223
NC
R217
NC
R249
NC
R259
NC
C201
NC
C202
NC
C203
NC
C204
NC
+3.3V
+3.3V
+3.3V
+40V
+3.3V
R201
NC
R203
NC
R205
NC
R207
NC
R209
NC
R211
NC
R215
NC
R219
NC
R225
NC
R233
NC
R243
NC
R251
NC
R261
NC
R269
NC
R279
NC
R287
NC
R289
NC
R281
NC
R271
NC
R263
NC
R253
NC
R245
NC
R235
NC
R227
NC
R239
NC
R257
NC
R275
NC
R293
NC
R286
NC
R278
NC
R268
NC
R260
NC
R250
NC
R242
NC
R232
NC
R224
NC
R218
NC
R214
NC
R288
NC
R280
NC
R270
NC
R262
NC
R252
NC
R244
NC
R234
NC
R226
NC
R220
NC
R216
NC
R212
NC
R210
NC
R208
NC
R206
NC
R204
NC
R202
NC
R290
NC
R282
NC
R272
NC
R264
NC
R254
NC
R246
NC
R236
NC
R228
NC
R294
NC
R276
NC
R258
NC
R240
NC
+40V
+15V
+15VPT
+15VPT
+15V
DG
DG
DG
DG
DG
DG
PG
PG
CN202
A1
A1
B1
B1
C1
C1
A2
A2
B2
B2
C2
C2
A3
A3
B3
B3
C3
C3
A4
A4
B4
B4
C4
C4
A5
A5
B5
B5
C5
C5
A6
A6
B6
B6
C6
C6
A7
A7
B7
B7
C7
C7
A8
A8
B8
B8
C8
C8
A9
A9
B9
B9
C9
C9
A10
A10
B10
B10
C10
C10
A11
A11
B11
B11
C11
C11
A12
A12
B12
B12
C12
C12
A13
A13
B13
B13
C13
C13
A14
A14
B14
B14
C14
C14
A15
A15
B15
B15
C15
C15
A16
A16
B16
B16
C16
C16
A17
A17
B17
B17
C17
C17
A18
A18
B18
B18
C18
C18
A19
A19
B19
B19
C19
C19
A20
A20
B20
B20
C20
C20
A21
A21
B21
B21
C21
C21
A22
A22
B22
B22
C22
C22
A23
A23
B23
B23
C23
C23
A24
A24
B24
B24
C24
C24
A25
A25
B25
B25
C25
C25
A26
A26
B26
B26
C26
C26
A27
A27
B27
B27
C27
C27
A28
A28
B28
B28
C28
C28
A29
A29
B29
B29
C29
C29
A30
A30
B30
B30
C30
C30
A31
A31
B31
B31
C31
C31
A32
A32
B32
B32
C32
C32
CN201
A1
A1
B1
B1
C1
C1
A2
A2
B2
B2
C2
C2
A3
A3
B3
B3
C3
C3
A4
A4
B4
B4
C4
C4
A5
A5
B5
B5
C5
C5
A6
A6
B6
B6
C6
C6
A7
A7
B7
B7
C7
C7
A8
A8
B8
B8
C8
C8
A9
A9
B9
B9
C9
C9
A10
A10
B10
B10
C10
C10
A11
A11
B11
B11
C11
C11
A12
A12
B12
B12
C12
C12
A13
A13
B13
B13
C13
C13
A14
A14
B14
B14
C14
C14
A15
A15
B15
B15
C15
C15
A16
A16
B16
B16
C16
C16
A17
A17
B17
B17
C17
C17
A18
A18
B18
B18
C18
C18
A19
A19
B19
B19
C19
C19
A20
A20
B20
B20
C20
C20
A21
A21
B21
B21
C21
C21
A22
A22
B22
B22
C22
C22
A23
A23
B23
B23
C23
C23
A24
A24
B24
B24
C24
C24
A25
A25
B25
B25
C25
C25
A26
A26
B26
B26
C26
C26
A27
A27
B27
B27
C27
C27
A28
A28
B28
B28
C28
C28
A29
A29
B29
B29
C29
C29
A30
A30
B30
B30
C30
C30
A31
A31
B31
B31
C31
C31
A32
A32
B32
B32
C32
C32
SFS2
SFS3
124
KX-NCP500UA
KX-NCP500
UA SCHEMATIC DIAGRAM No.2 (2/2)
(1)
6
5
8
7
EC_AD[0]
EC_AD[1]
EC_AD[2]
EC_AD[3]
EC_AD[4]
EC_AD[5]
EC_AD[6]
EC_AD[7]
EC_AD[8]
EC_AD[9]
EC_AD[10]
EC_AD[11]
EC_AD[12]
EC_AD[13]
EC_AD[14]
EC_AD[15]
CT_D[0]
CT_D[1]
CT_D[2]
CT_D[3]
CT_D[4]
CT_D[5]
CT_D[6]
CT_D[7]
EC_CLK
EC_nCDET
CT_C8
EC_nINT
EC_nCBE[1]
EC_nRST
EC_PAR
EC_nCBE[0]
EC_nPERR
EC_nFRAME
EC_nSTOP
EC_nTRDY
CT_FRAME
CT_NETREF
nLOS
nHALT
RING_SYNC
nCS_SYNC_B
RINGER
EC_AD[11]
EC_AD[10]
CT_D[1]
EC_AD[8]
CT_D[0]
EC_AD[7]
EC_nCDET
EC_AD[6]
EC_AD[5]
EC_AD[4]
EC_AD[3]
RING_SYNC
EC_AD[1]
RINGER
EC_AD[0]
nLOS
EC_nRST
EC_nCBE[1]
EC_nCBE[0]
EC_PAR
EC_nFRAME
EC_nPERR
CT_FRAME
CT_C8
CT_NETREF
CT_D[6]
CT_D[5]
CT_D[7]
CT_D[4]
EC_AD[13]
CT_D[3]
EC_AD[9]
CT_D[2]
EC_AD[2]
EC_nINT
EC_AD[15]
EC_AD[14]
EC_AD[12]
EC_AD[0]
nHALT
nCS_SYNC_B
EC_nTRDY
EC_CLK
EC_nSTOP
CN204
A1
POWERGND
B1
+15V
A2
POWERGND
A3
+40V
A4
POWERGND
B4
+15VPT
A5
+40V
B5
+15V
B2
+15VPT
B3
+15V
A6
POWERGND
B6
+15VPT
A7
EC_AD[2]
B7
EC_AD[5]
A8
EC_AD[3]
B8
EC_AD[4]
A9
EC_AD[0]
B9
EC_AD[7]
A10
EC_AD[1]
B10
EC_AD[6]
A11
EC_nCBE[1]
B11
EC_AD[9]
A12
EC_nRST
B12
EC_AD[8]
A13
EC_PAR
B13
EC_AD[11]
A14
EC_nCBE[0]
B14
EC_AD[10]
A15
EC_nPERR
B15
EC_AD[13]
A16
EC_nFRAME
B16
EC_AD[12]
A17
EC_nSTOP
B17
EC_AD[15]
A18
EC_nTRDY
B18
EC_AD[14]
A19
EC_CLK
B19
EC_nCDET
A20
CT_C8
B20
EC_nINT
A21
GND
B21
GND
A22
GND
B22
GND
A23
RTS1
B23
CT_D[1]
A24
TXD1
B24
CT_D[0]
A25
nLEDRUN
B25
CT_D[3]
A26
DTR
B26
CT_D[2]
A27
DCD1
B27
CT_D[5]
A28
+3.3V
B28
CT_D[4]
A29
GND
B29
GND
A30
GND
B30
GND
A31
DSR
B31
CT_D[7]
A32
nLEDALM
B32
CT_D[6]
A33
RXD1
B33
CT_FRAME
A34
CTS1
B34
CT_NETREF
A35
DC_ALM
B35
nFAN_ALM
A36
AC_ALM
B36
nLOS
A37
GND
B37
GND
A38
GND
B38
GND
A39
nHALT
B39
RING_SYNC
A40
nCS_SYNC_B
B40
RINGER
+40V
+15V
+15VPT
+40V
PG
+15V
+15VPT
+3.3V
DG
DG
PG
FG
DG
J201
0
J202
0
J203
0
J204
0
J205
0
J206
0
C214
0.1u
C221
0.1u
+15V
C224
0.1u
C225
0.1u
C210
0.1u
DG
C213
0.1u
+3.3V
DG
C212
0.1u
C211
0.1u
C222
0.1u
C223
0.1u
C208
0.1u
C220
0.1u
DG
C207
0.1u
C209
0.1u
C205
0.1u
C216
0.1u
C206
0.1u
C217
0.1u
DG
+15VPT
C219
0.1u
+40V
C218
0.1u
C215
0.1u
C226
100uF
+40V
PG
C227
100uF
CN203
A1
A1
B1
B1
C1
C1
A2
A2
B2
B2
C2
C2
A3
A3
B3
B3
C3
C3
A4
A4
B4
B4
C4
C4
A5
A5
B5
B5
C5
C5
A6
A6
B6
B6
C6
C6
A7
A7
B7
B7
C7
C7
A8
A8
B8
B8
C8
C8
A9
A9
B9
B9
C9
C9
A10
A10
B10
B10
C10
C10
A11
A11
B11
B11
C11
C11
A12
A12
B12
B12
C12
C12
A13
A13
B13
B13
C13
C13
A14
A14
B14
B14
C14
C14
A15
A15
B15
B15
C15
C15
A16
A16
B16
B16
C16
C16
A17
A17
B17
B17
C17
C17
A18
A18
B18
B18
C18
C18
A19
A19
B19
B19
C19
C19
A20
A20
B20
B20
C20
C20
A21
A21
B21
B21
C21
C21
A22
A22
B22
B22
C22
C22
A23
A23
B23
B23
C23
C23
A24
A24
B24
B24
C24
C24
A25
A25
B25
B25
C25
C25
A26
A26
B26
B26
C26
C26
A27
A27
B27
B27
C27
C27
A28
A28
B28
B28
C28
C28
A29
A29
B29
B29
C29
C29
A30
A30
B30
B30
C30
C30
A31
A31
B31
B31
C31
C31
A32
A32
B32
B32
C32
C32
SFS1
CN204
SFS2(CN202)
SFS1(CN203)
SFS3(CN201)
C
E
B
A
D
F
Page of 127
Display

Click on the first or last page to see other KX-NCP500UA service manuals if exist.

RANDOM: