Motorola CDM Series Service Manual page 67

&RQWUROOHU %RDUG $XGLR DQG 6LJQDOLQJ &LUFXLWV
 7UDQVPLW $XGLR &LUFXLWV
5HIHU WR )LJXUH  IRU UHIHUHQFH IRU WKH IROORZLQJ VHFWLRQV
FLAT
TX RTN
EXPANSION BOARD
MIC
CONTROL HEAD
CONNECTOR
EXT MIC
FLAT TX
AUDIO
ACCESSORY
CONNECTOR
 0LF'DWD ,QSXW 3DWK
7KH UDGLR VXSSRUWV  GLVWLQFW PLFURSKRQH SDWKV NQRZQ DV LQWHUQDO IURP FRQWURO KHDG DQG H[WHUQDO
PLF IURP DFFHVVRU\ FRQQHFWRU - DQG DQ DX[LOLDU\ SDWK )/$7 7; $8',2 IURP DFFHVVRU\
FRQQHFWRU -  7KH PLFURSKRQHV XVHG IRU WKH UDGLR UHTXLUH D '& ELDVLQJ YROWDJH SURYLGHG E\ D
UHVLVWLYH QHWZRUN
7KHVH WZR PLFURSKRQH DXGLR LQSXW SDWKV HQWHU WKH $6),& &03 DW 8 H[WHUQDO PLF DQG
8 LQWHUQDO PLF  )ROORZLQJ WKH LQWHUQDO PLF SDWK WKH PLFURSKRQH LV SOXJJHG LQWR WKH UDGLR
FRQWURO KHDG DQG LV FRQQHFWHG WR WKH FRQWUROOHU ERDUG YLD - 
)URP KHUH WKH VLJQDO LV URXWHG YLD 5 DQG OLQH ,17 0,& WR 5 5 DQG 5 SURYLGH WKH
9'& ELDV 5HVLVWLYH GLYLGHU 5  5 GLYLGH WKH LQSXW VLJQDO E\  DQG SURYLGH LQSXW
SURWHFWLRQ IRU WKH &026 DPSOLILHU LQSXW 5 DQG & SURYLGH D  RKP $& SDWK WR JURXQG
WKDW VHWV WKH LQSXW LPSHGDQFH IRU WKH PLFURSKRQH DQG GHWHUPLQHV WKH JDLQ EDVHG RQ WKH HPLWWHU
UHVLVWRU LQ WKH PLFURSKRQH¶V DPSOLILHU FLUFXLW
& VHUYHV DV D '& EORFNLQJ FDSDFLWRU 7KH DXGLR VLJQDO DW 8 73 VKRXOG EH
DSSUR[LPDWHO\ P9 IRU N+] RU N+] RI GHYLDWLRQ ZLWK N+] RU N+] FKDQQHO VSDFLQJ
7KH H[WHUQDO PLFURSKRQH VLJQDO HQWHUV WKH UDGLR RQ DFFHVVRU\ FRQQHFWRU - SLQ  DQG LV URXWHG
YLD OLQH (;7 0,& WR 5 5 DQG 5 SURYLGH WKH 9'& ELDV 5HVLVWLYH GLYLGHU 5 
5 GLYLGH WKH LQSXW VLJQDO E\  DQG SURYLGH LQSXW SURWHFWLRQ IRU WKH &026 DPSOLILHU LQSXW
J0451
18
J0401
TP0221
9
MIC
INT
46
J0501
MIC
EXT
TP0222
2 48
42
5
AUX
U0211-4
TX
FROM
µP Pin3
)LJXUH  7UDQVPLW $XGLR 3DWKV
J0551
31 IN/OUT
OPTION
39
OUT
BOARD
33
IN
OUT
32
44 36
TX SND TX RTN
FILTERS AND
PREEMPHASIS
ASFIC_CMP
MIC
IN
U0221
LIMITER
HS SUMMER
SPLATTER
FILTER
LS SUMMER
ATTENUATOR
&KDSWHU  
VCO MOD IN
TO
ATN
40
RF
SECTION
(SYNTHESIZER)
 &%