GE PHOENIX-SX Service Section

SERVICE SECTION
403-440 MHz and 450-512 MHz PHOENIX-SX TWO-WAY RADIO
(WIDEBAND ~ SYNTHESIZED)
prom ee ee ee eee TABLE OF CONTENTS ~~ -—-——--—~ ----~ ------ +
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DESCRIPTION wi. ese ee eee SG RR Shae ak Ueghs "BURN Soe a eae SS wee soa aes Le ee Wow wre Bee Sate nS ecen ce 1
LANDA OTS TUPN Dis eh ease atm laces Ath Gael t i d e s gah dedi ISI Get a Bit haa Rs |
, OPTION MODIFICATIONS 2.0... ever ee ee We alaes aad rates Jest ihat ets Mie ee Jord aad Se Ln ty Meeps hs adi. ga 2 |
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li MAGINIPENAN GES 4.6 ccbcb aba Bad on ale ni Wak ei diodes dae Gl goatee epee de Se bea Seay gee asec teas 2:
Preventive Maintenance .w.cveveenoae eS ee ee lk aaa ek Bk a ha ee ee 2
DiSASSOMD LY. fey cee weds a ees eta Be Se 2 AD dod SER eee Gee eee ak ean ee a eet See 3 |
| Driver and PA Transistor Replacement ccc cece cc ete ee eee te teen n eae 3
i Replacing Chip Components ... cece cece ee eee ete tenes i h e hast aes 5 |
RAMONES UGE S Cctn ac esc iewitanst Mais ees coe teas tab tecaa Nea ele dendeas tit Ack cain "akin oa aah Mv Sg tata aeteal ae tent fal te RU <A a
TEST AND TROURLESHOOTING PROCEDURES 2... cee ce eee eee eee adiunkdethe Su 6
Servicing TechniqueS 2... ...ccc ee eee C o l o lean cay ay erage tercae hapactasie: proeee desece cetacean wey bhcer wee 6 |
| MiCPOCOMHUTALT TIA CANSTICS oxmescce bo eke do eo Oe RS BOR SNe Da eS we vi
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| TROUBERSHOOPING PROCKDURE: sa-sakoeale page Pe letecd Pe alesis Ba ee ele ye tee pase 11
FREQUENCY & MODULATION ADJUSTMENTS 2.2... ee ec eee ee ee te ee eee 12
Frequency Adjustments ...... Ysera hee i Sebin tye Beer ie g u i d e is tae ve ie BA a le batter tee dan teres 12
TRANSMITTER ALIGNMENT
Preliminary Checks and Adjustments 2... cece cee ee ew ee ree ee ens 135
Alignment Procedure 2. cece eee eee et eee ene a rar aten dente Sydow oe BARe wre ence naar e Oe: ok 13
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RECEIVER ALIGNMENT
Prelimingery Checks: cateio cel See pees ewe wipes PE Sa ee PE A eee ee ee oat & 14
Alienment Procedure .cceee eevee ee ee ee eee Spee eee ae ee eee 14
RECEIVER TEST. PROCEDURES! s)asic. 2.8344 Mie oa Se ae eke haere, Fis eles isc Saas Sree ae ee buses 16 |
' RECRIVER AUDIO CHECKS ..... east Mich We ae eae ea Foie ace faecal Ak po: She ra Bisa e ecglense eh OShe P 16 |
| MECHANICAL LAYOUT .eee cece cece ace e e s dene We STS, ons a Mare btrare Med Ie aE ESET a ns ae besten 17 |
| SYSTEM INTERCONNECTION DIAGRAMS .......6- Sade eters Hirt Mierke Goats RE a a eee 18-20
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' INSTALLATION DIAGRAMS, OPTIONS. 2. cc eacee ice dee cecere ea a We ae Wonhe wee CSS Me ee ees 21-23
ponerse LEST! oe ech a S l e dew ere ete ele Roeser ew a a d hdaGatary veral Soe ven See yee eniiass, Steet 24-25 |
DESCRIPTION TRANSMITTER ADJUSTMENT
The transmitter is factory preset
The Service Section contains dis- and requires no adjustment. However, the
assembly procedures, procedures for antenna length should he adjusted for
replacing PA transistors, Integrated optimum VSWR. Next, measure the fre-
Cirenits (IC's) and chip components and quency and modulation and record these
related drawings. Also included are measurements for future reference. For
Atignment prseedures and option modifi- the complete transmitter adjustment,
rations and troubleshooting information refer to the Alignment Procedure (Sec
(See Table of Contents). Table of Contents).
RECEIVER ADJUSTMENT
INITIAL ADJUSTMENT
No initial adjustments to the re-
. . -eiver are re ired.
After the radio has been installed CeIVen ane Vea ir cd
(as deseribed in the [Installation Man-
ual), the following adjustments should be
made by an authorized electronics
technician.
CHANNEL GUARD NISARBLE/DIGITAL CONDE
POLARITY REVERSAL
All radios are capable of operating
with tone and digital Channel Guard under