Roadstar TRA-1955 User manual

Service Manual -TRA-1955
R
TRA-1955
Service Manual -TRA-1955

2.PRODUCTSAFETYNOTICE
Someelectricaland mechanicalpartshavespecialsafetyrelated
characteristics whichareof ten notevidentfromvisualinspection,norcan
the protection theygivenecessarilybe obtained byreplacing themwith
componentsrated forhighervoltage,wattage,etc.Partsthathavespecial
safetycharacteristics areidentified byaon schematicand partslist.
Useofasubstitutereplacementthatdoesnothavethe samesafety
characteristics asthe recomm ended replacementpartmightcreateshock,
fire,and/orotherhazards.ProductSafetyisunderreviewcontinuously
and newinstructionsareissued wheneverappropriate.
3.SERVICINGPRECAUTIONS
CAUTIONBeforeservicing the unitcovered bythisservicemanualand
itssupplements,read and followthe SAFETYPRECAUTIONSon thispage
NOTE.If unforeseen circumstancescreateaconflictbetween the following
servicing precautionsand anyofthe safetyprecautions,alway s follow
the safetyprecautions.Remember,SafetyFirst.
GeneralServicing Precautions.
aAlways unplug the unit’sACpowercordfromthe ACpowersource
before.
(1)Removing orreinstalling anycomponent, circuitboard,module,orany
otherunitassembly.
(2)Disconnecting orreconnecting anyunitelectricalplug orotherelectrical
connection.
(3)Connecting atestsubstituteinparallelwithan electrolyticcapacitorin
the unit.
Caution
a.Wrong partsubstitution orincorrectpolarityinstallation ofelectrolytic
capacitorsmayresultinan explostion hazard
b.Donotdefeatanyplug/socketB+voltage interlocks withwhichthe
unitcovered bythisservicemanualmightbe equipped
c.DonotapplyACpowertothisunitand/oranyofitselectricalassemblies
unless all solid-statedeviceheatsinks arecorrectlyinstalled
d.Alwaysconnectatestunitinstrument’sground lead tothe unit’schassis/
sground beforeconnecting the testinstrument’spositivelead.Always
removethe testinstrument’sground lead last.
IMPORTANTSERVICESAFETYINFORMATION
1.SAFETYPRECAUTIONS
Beforereturning aunittothe customer,always makeasafetycheck of
the entireunit, including,butnotlimited tothe following items.
a.Besurethatno built-inprotectivedevicesaredefectiveand/orhave
been defeated during servicing.
(1)Protectiveshieldsareprovided toprotectboththe technician and
the customer.Correctlyreplaceall missing protectiveshields
including and removed forservicing convenience.
(2)When reinstalling the chassisand/orotherassembliesinthe
cabinet, be suretoputback inplaceall protectivedevices,
including,butnotlimited to,nonmetalliccontrolknobsinsulating
fishpapers,adjustmentand compartmentcovers/shieldsand
isolation resistor/capacitornetworks.Donotoperatethisunitor
permitittobe operated withoutall protectivedevicescorrectly
installed and functioning.
b.Besurethatthereareno cabinetopeningsthrough whichan adultor
childmightbe abletoinserttheirfingersand contactahazardous
voltage.Suchopeningsinclude,butarenotlimited to,excessively
wide cabinetventilation slots,and an improperlyfitted and/orincorrectly
secured cabinetback cover.
c.Leakage CurrentHotCheck -Withthe unitcompletelyreassembled,
plugthe ACline corddirectlyintoa230VACoutlet.(Donotusean
isolation transformerduring thistest.)Usealeakage currenttesteror
ametering systemthatcomplieswithAmerican NationalStandards
Institute(ANSI)C101.1“Leakage CurrentforAppliances”a nd
UnderwritersLaboratories(UL)1410,(50.7).Withthe unitACswitch
firstinthe ONposition and then inthe OFF position,measurefroma
knownearthground (metalwaterpipe,conduit, etc.)toall exposed
metalparsofthe unit(antennas,handlebracket, metalcabinet,
screwheads,metallicoverlay s,controlshaft, etc.),especiallyand
exposed metalpartsthatof feran electricalreturnpathtothe chassis.
Anycurrentmeasured mustnotexceed 0.5milliampReversethe unit
powercordplug inthe outletand repeattest. ANYMEASU REMENTS
NOTWITHINTHELIMITSSPECIFIEDHERENININDICATEA
POTENTIALSHOCKHAZAR D TAHTMUSTBE ELIMINATEDBEFORE
RETURNINGTHEU NITTOTHECU STOMER.
ACLeakage Test
+-
d. Insulation ResistanceTestColdCheck
Unplug the powersupplycordand connectajumperwirebetween the
twoprongsofthe plug.
Turnon the powerswitchofthe unit.
Measurethe resistancewithan ohm meterbetween the jumpered AC
plug and eachexposed metalliccabinetparton the unit, suchas
screwheads,antenna,controlshafts,handlebrackets,etc.When the
exposed metallicparthasareturnpathtothe chassis,the reading
shouldbe between 1and 5.2megohms.When thereisno returnpathto
the chassis,the reading mustbe “infinite”.If itisnotwithinthe limits
specified,thereisthe possibilityofashock hazard,and the unitmust
be repaired and rechecked beforeitisreturned tothe customer.

STEP SET SIGNAL SET DIAL ADJUST ADDJUST FOR
1 465 KHz GAND T3(1 st IF) MAXIMUM
2 CLOSED T5(2 nd IF) OUTPUT.
3
4 520KHz GANG CLOSED L5(AM OSC COIL)
5 1630KHz GANG OPEN CT4(AM OSC TRIM) MAXIMUM
6 600KHz BAR1(AM ANT COIL) OUTPUT.
7 1400KHz CT3(AM ANT TRIM)
8
STEP SET SIGNAL SET DIAL ADJUST ADDJUST FOR
MAX AMPLITUDE
BALANCED
10.7 MHz CURVE WITH
2 OPEN T4(2 nd FM IF) 10.7mhzAT ZERO
CROSSOVER.
3
STEP SET SIGNAL SET DIAL ADJUST ADDJUST FOR
4 87.5 MHz GANG CLOSED L4(FM OSC COIL)
5 108.5 MHz GANG OPEN CT2(FM OSC COIL) MAXIMUM
6 90MHz 90MHz L2(FM RF COIL) OUTPUT
7 106 MHz 106 MHz CT1(FM RF TRIM)
8
ALIGNMENT PROCEDURES
1.Set the BAND switch to AM
2.Connect an RF generator to a standard radiating loop
3.Connect a VTVM across the speaker voice coil.
REPEAT STEPS 1 AND 2 TO OBTAIN MAXIMUM OUTPUT.
REPEAT STEPS 6 AND 7 TO OBTAIN BEST TRACKING
FM ALIGNMENT
1.Set the BAND switch to FM
2.Connect an RF generator to the emitter of Q2 through a 0.1uF capacior and ground.
3.Connect an oscilloscope to pin 8 of IC I through a 0.02uF capacitor and ground.
1.Connect an RF generator to the FM antenna terminal and ground.
2.Connect a VTVM across the speaker voice coil.
REPEAT STEPS 6 AND 7 TO OBTAIN MAXIMUM OUTPUT.
1 GAND T1(1 st FM IF)
REPEAT STEPS 1 AND 2 TO OBTAIN MAXIMUM OUTPUT.

1
1.3 1.2 0 6 6 1.1 1.1 1.4
9
0.02 1.2 0 2.8 6 6 6 1.45
10 11 12 13 14 15 16
2345678
Q1 B
4.3 0.56
0.564.21.2
RADIO I.C
CD 7613
(Front view) (Bottom view)
9018G DIODE
CATHODE
SEMICONDUCTOR DEVICES
9018G
1.2
CE
Q2 BCE
TRANSISTOR
VOLTAGE CHARTS
CD 7613
CBE
9
18
16

REF. POSITION DESCRIPTION QTY PART NO.
P.C.B. PR-108 1 PR-108 M.B
PVC P.V.C AM/FM 126PVC 1 P0020
VOL VOLUME 16MM VOLUME D50K W/SW 1 V0020
TONE VOLUME 16MM VOLUME D50K 1 V0021
SW1 BAND SWITCH SS22F16G9 1 SW290
CN1 CONNECT PIN 2PIN*55MM 1CP005
CN3 CONNECT PIN 3PIN*85MM 1CP016
CN2 CONNECT PIN 5PIN*100MM 1CP062
L4 COIL FM 4.5x2.5T 1 C0110
L1-2 COIL FM 4.5x3.5T 2 C0120
L3 COIL FM 3x19.5T 1 C0070
BAR1 COIL AM 130:15T 1 C0050
L7 COIL 3T BEAD "C" 1 C0250
L6 COIL 15UH 1 C0240
AM ANT. BAR 4x10x39MM 1 BA020
L5 I.F.T 1083 A(RED) 1 IF071
T5 I.F.T 1083 C(WHITE) 1 IF091
T3 I.F.T 1083 B(YELLOW) 1 IF081
T1 I.F.T 1083 D(ORANGE) 1 IF101
T4 I.F.T 1083 F (PINK) 1 IF111
IC1 I.C. CD7613 1 IC060
Q1-2 TRANSISTOR 9018H 2 T0050
D2-4 DIODE IN 4001 3 DI020
D1 D5 D6 DIODE IN 4148 3 DI010
DC- DC+ AC.0 AC.~ AC.~ ANT EYELET 203(2x3MM) 8 EY010
VOL EYELET 204(2x4MM) 2 DY020
C25 C.CAP 0.001UF(102) 1 CA010
C4 C11 C15 C23 C.CAP 0.005UF(502) 4 CA030
C10 C13 C18-21 C29 C32-33 C.CAP 0.02UF(203) 9 CA050
C24 C.CAP 0.04UF(403) 1 CA060
C37 C.CAP 0.022UF(223M) 1 M0070
C26 C.CAP 3P 1 CA090
C6 C.CAP 7P 1 CA110
C9 C.CAP 10P 1 CA300
C5 C12 C.CAP 20P 2 CA140
C7 C.CAP 25P 1 CA160
C1-3 C14 C.CAP 30P 4 CA180
IC1-2 C.CAP 50P 1 CA210
C22 C.CAP 120P 1 CA240
C8 C.CAP 300P 1 CA270
C16-17 C27 E.CAP 220UF/10V 3 E0090
C28 C30-31 E.CAP 470UF/10V 3 E0100
REPLACEMENT PARTS LIST
AM/FM PORTABLE RADIO

REF. POSITION DESCRIPTION QTY PART NO.
REPLACEMENT PARTS LIST
AM/FM PORTABLE RADIO
R3 R19 RESISTOR 100 OHM 2 R0161
R7 RESISTOR 150 OHM 1 R0190
R9 RESISTOR 220 OHM 1 R0210
R10 RESISTOR 560 OHM 1 R0270
R1 R6 R8 RESISTOR 1K 3 R0300
R4 R16 RESISTOR 1.5K 2 R0320
R11 RESISTOR 2.2 K 1 R0340
R17 RESISTOR 3.3 K 1 R0360
R12 R14 RESISTOR 33 K 2 R0500
R15 RESISTOR 47 K 1 R0520
R13 RESISTOR 56 K 1 R0530
R2 RESISTOR 100 K 1 R0560
R5 RESISTOR 150 K 1 R0580
R18 RESISTOR 220 K 1 R0620
ROD ANTENNA 6A6B 1AN020
SPK SPEAKER 2-1/4" WITH CAP 2 SP010
TRANSFORMER GONICA 6.5V 1TR010
JACK1 JACK EJ-3507 1 EJ010
VOL TONE SCREW 1.7x4 PM 2 SPM01
VC1 SCREW 2.6x4 KM 2 SKM01
PVC ANT. SCREW 2.6x5 PM 2 SPM03
HANDLE SCREW 2.6x6 PT 3 SPB06
BAND SCREW 2.6x6 WA(B) 1 SWA07
PCB ANT. BATTERY SCREW 2.6x8 PA 9 SPA07
TRANSFORMER SCREW 3x10 WA 3 SWA03
CABINET SCREW 3x18 PA 4 SPA20

REF. POSITION DESCRIPTION QTY PART NO.
P.C.B. PR-108 1PR-108 M.B
PVC P.V.C AM/FM 126PVC 1P0020
VOL VOLUME 16MM VOLUME D50K W/SW 1V0020
TONE VOLUME 16MM VOLUME D50K 1V0021
SW1 BAND SWITCH SS22F16G9 1SW290
CN1 CONNECT PIN 2PIN*55MM 1
CP005
CN3 CONNECT PIN 3PIN*85MM 1
CP016
CN2 CONNECT PIN 5PIN*100MM 1
CP062
L4 COIL FM 4.5x2.5T 1C0110
L1-2 COIL FM 4.5x3.5T 2C0120
L3 COIL FM 3x19.5T 1C0070
BAR1 COIL AM 130:15T 1C0050
L7 COIL 3T BEAD "C" 1C0250
L6 COIL 15UH 1C0240
AM ANT. BAR 4x10x39MM 1BA020
L5 I.F.T 1083 A(RED) 1IF071
T5 I.F.T 1083 C(WHITE) 1IF091
T3 I.F.T 1083 B(YELLOW) 1IF081
T1 I.F.T 1083 D(ORANGE) 1IF101
T4 I.F.T 1083 F(PINK) 1IF111
IC1 I.C. CD7613 1IC060
Q1-2 TRANSISTOR 9018H 2T0050
D2-4 DIODE IN 4001 3DI020
D1 D5 D6 DIODE IN 4148 3
DI010
DC- DC+ AC.0 AC.~ AC.~
A
EYELET 203(2x3MM) 8
EY010
VOL EYELET 204(2x4MM) 2
DY020
C25 C.CAP 0.001UF(102) 1CA010
C4 C11 C15 C23 C.CAP 0.005UF(502) 4CA030
C10 C13 C18-21 C29 C32-33 C.CAP 0.02UF(203) 9 CA050
C24 C.CAP 0.04UF(403) 1CA060
C37 C.CAP 0.022UF(223M) 1M0070
C26 C.CAP 3P 1
CA090
C6 C.CAP 7P 1CA110
C9 C.CAP 10P 1CA300
C5 C12 C.CAP 20P 2CA140
C7 C.CAP 25P 1CA160
C1-3 C14 C.CAP 30P 4
CA180
IC1-2 C.CAP 50P 1CA210
C22 C.CAP 120P 1CA240
C8 C.CAP 300P 1CA270
C16-17 C27 E.CAP 220UF/10V 3E0090
C28 C30-31 E.CAP 470UF/10V 3E0100
R3 R19 RESISTOR 100 OHM 2R0161
R7 RESISTOR 150 OHM 1R0190
R9 RESISTOR 220 OHM 1R0210
R10 RESISTOR 560 OHM 1R0270
R1 R6 R8 RESISTOR 1K 3R0300
R4 R16 RESISTOR 1.5K 2R0320
R11 RESISTOR 2.2 K 1R0340
R17 RESISTOR 3.3 K 1R0360
R12 R14 RESISTOR 33 K 2R0500
AM/FM PORTABLE RADIO

REF. POSITION DESCRIPTION QTY PART NO.
AM/FM PORTABLE RADIO
R15 RESISTOR 47 K 1R0520
R13 RESISTOR 56 K 1R0530
R2 RESISTOR 100 K 1R0560
R5 RESISTOR 150 K 1R0580
R18 RESISTOR 220 K 1R0620
ROD ANTENNA 6A6B 1AN020
SPK SPEAKER 2-1/4" WITH CAP 2SP010
TRANSFORMER GONICA 6.5V 1TR010
JACK1 JACK
EJ-3507
1EJ010
VOL TONE SCREW SCREW 1.7x4 PM 2SPM01
VC1 SCREW SCREW 2.6x4 KM 2SKM01
PVC ANT. SCREW SCREW 2.6x5 PM 2SPM03
HANDLE SCREW SCREW 2.6x6 PT 3SPB06
BAND SCREW SCREW 2.6x6 WA(B) 1SWA07
PCB ANT. BATTERY SCR
E
SCREW 2.6x8 PA 9SPA07
TRANSFORMER SCREW SCREW 3x10 WA 3SWA03
CABINET SCREW SCREW 3x18 PA 4SPA20
CABINET 1
INSTRUCTION SHEET 1
WARRANTY CARD 1
LABELS
BOX 1
BUBBLE BAG 1
POLY BAG 1
CARTON (12pcs/ct) 1

REF. POSITION DESCRIPTION QTY PART NO.
P.C.B. PR-108 1 PR-108 M.B
PVC P.V.C AM/FM 126PVC 1 P0020
VOL VOLUME 16MM VOLUME D50K W/SW 1 V0020
TONE VOLUME 16MM VOLUME D50K 1 V0021
SW1 BAND SWITCH SS22F16G9 1 SW290
CN1 CONNECT PIN 2PIN*55MM 1CP005
CN3 CONNECT PIN 3PIN*85MM 1CP016
CN2 CONNECT PIN 5PIN*100MM 1CP062
L4 COIL FM 4.5x2.5T 1 C0110
L1-2 COIL FM 4.5x3.5T 2 C0120
L3 COIL FM 3x19.5T 1 C0070
BAR1 COIL AM 130:15T 1 C0050
L7 COIL 3T BEAD "C" 1 C0250
L6 COIL 15UH 1 C0240
AM ANT. BAR 4x10x39MM 1 BA020
L5 I.F.T 1083 A(RED) 1 IF071
T5 I.F.T 1083 C(WHITE) 1 IF091
T3 I.F.T 1083 B(YELLOW) 1 IF081
T1 I.F.T 1083 D(ORANGE) 1 IF101
T4 I.F.T 1083 F(PINK) 1 IF111
IC1 I.C. CD7613 1 IC060
Q1-2 TRANSISTOR 9018H 2 T0050
D2-4 DIODE IN 4001 3 DI020
D1 D5 D6 DIODE IN 4148 3 DI010
DC- DC+ AC.0 AC.~ AC.~ ANT1.S
P
EYELET 203(2x3MM) 8 EY010
VOL EYELET 204(2x4MM) 2 DY020
C25 C.CAP 0.001UF(102) 1 CA010
C4 C11 C15 C23 C.CAP 0.005UF(502) 4 CA030
C10 C13 C18-21 C29 C32-33 C.CAP 0.02UF(203) 9 CA050
C24 C.CAP 0.04UF(403) 1 CA060
C37 C.CAP 0.022UF(223M) 1 M0070
C26 C.CAP 3P 1 CA090
C6 C.CAP 7P 1 CA110
C9 C.CAP 10P 1 CA300
C5 C12 C.CAP 20P 2 CA140
C7 C.CAP 25P 1 CA160
C1-3 C14 C.CAP 30P 4 CA180
IC1-2 C.CAP 50P 1 CA210
C22 C.CAP 120P 1 CA240
C8 C.CAP 300P 1 CA270
C16-17 C27 E.CAP 220UF/10V 3 E0090
C28 C30-31 E.CAP 470UF/10V 3 E0100
R3 R19 RESISTOR 100 OHM 2 R0161
R7 RESISTOR 150 OHM 1 R0190
R9 RESISTOR 220 OHM 1 R0210
R10 RESISTOR 560 OHM 1 R0270
R1 R6 R8 RESISTOR 1K 3 R0300
R4 R16 RESISTOR 1.5K 2 R0320
R11 RESISTOR 2.2 K 1 R0340
R17 RESISTOR 3.3 K 1 R0360
R12 R14 RESISTOR 33 K 2 R0500
REPLACEMENT PARTS LIST
AM/FM PORTABLE RADIO

REF. POSITION DESCRIPTION QTY PART NO.
REPLACEMENT PARTS LIST
AM/FM PORTABLE RADIO
R15 RESISTOR 47 K 1 R0520
R13 RESISTOR 56 K 1 R0530
R2 RESISTOR 100 K 1 R0560
R5 RESISTOR 150 K 1 R0580
R18 RESISTOR 220 K 1 R0620
ROD ANTENNA 6A6B 1 AN020
SPK SPEAKER 2-1/4" WITH CAP 2 SP010
TRANSFORMER GONICA 6.5V 1TR010
JACK1 JACK EJ-3507 1EJ010
VOL TONE SCREW 1.7x4 PM 2 SPM01
VC1 SCREW 2.6x4 KM 2 SKM01
PVC ANT. SCREW 2.6x5 PM 2 SPM03
HANDLE SCREW 2.6x6 PT 3 SPB06
BAND SCREW 2.6x6 WA(B) 1 SWA07
PCB ANT. BATTERY SCREW 2.6x8 PA 9 SPA07
TRANSFORMER SCREW 3x10 WA 3 SWA03
CABINET SCREW 3x18 PA 4 SPA20