Yaesu FT-710 User manual

HF/50 MHz TRANSCEIVER
FT-710
Introduction
This manual provides the technical information necessary
for servicing the FT-710 HF/50 MHz TRANSCEIVER.
Servicing this equipment requires expertise in handling
surface-mount chip components. Attempts by non-qualied
persons to service this equipment may result in permanent
damage not covered by the warranty, and may be illegal in
some countries.
While we believe the information in this manual to be cor-
rect, YAESU assumes no liability for damage that may oc-
cur as a result of typographical or other errors that may be
present. Your cooperation in pointing out any inconsisten-
cies in the technical information would be appreciated.
Important Note
This transceiver was assembled using Pb (lead) free solder, based on the RoHS specication.
Only lead-free solder (Alloy Composition: Sn-3.0Ag-0.5Cu) should be used for repairs performed on this apparatus. The solder stated
above utilizes the alloy composition required for compliance with the lead-free specication, and any solder with the above alloy com-
position may be used.
Technical Supplement
EH080H90A
©2022 YAESU MUSEN CO., LTD.
Contents
Specications
Exploded View
Block Diagram
Connection Diagram
Alignment
Board Unit (Schematics, Layouts & Parts)
MAIN Unit
PA Unit
DISPLAY Unit
JACK Unit

FT-710 Technical SupplementSPESIFICATIONS -1
Specications
General
Tx Frequency Ranges: 1.8MHz - 54MHz (Amateur bands only)
70MHz - 70.5MHz (UK Amateur bands only)
Rx Frequency Range: 30kHz - 75MHz (operating)
 1.8MHz-29.699999MHz(speciedperformance,Amateurbandsonly)
 50MHz-53.999999MHz(speciedperformance,Amateurbandsonly)
70MHz - 70.499999MHz(speciedperformance,UKAmateurbandsonly)
Emission Modes: A1A(CW),A3E(AM),J3E(LSB,USB),F3E(FM)
Frequency Steps: 1*/5/10/20Hz(CW,SSB,AM),100Hz(FM)*FINEtuning“ON”
Antenna Impedance: 50Ohms,unbalanced(AntennaTunerOFF)
 16.7-150Ohms,unbalanced
 (AntennaTunerON,1.8MHz-29.7MHzAmateur bands)
 25-100Ohms,unbalanced(Antenna TunerON,50MHzAmateur band)
Operating Temperature Range: +32°Fto+122°F(0°Cto+50°C)
Frequency Stability: ±0.5ppm(after1minute@+32°Fto+122°F[0°Cto+50°C])
Supply Voltage: DC13.8V±15%(NegativeGround)
Power Consumption (Approx.): Rx (no signal) 1.8A
Rx (signal present) 2.2A
 Tx (100W) 21A
Dimensions(WxHxD): 9.4”x3.1”x9.7”(239x80x247mm)
Weight (Approx.): 9.92lbs (4.5kg)
Transmier
Power Output: 5-100was(5-25WAMcarrier)
Modulation Types: J3E(SSB):Balanced,
 A3E(AM):Low-Level(EarlyStage),
 F3E(FM):VariableReactance
Maximum FM Deviation: ±5.0kHz/±2.5kHz(Narrow)
Harmonic Radiation: Beerthan–50dB(1.8MHz-29.7MHzAmateurbands)
 Beerthan–63dB(50MHz Amateur band)
SSB Carrier Suppression: Atleast60dBbelowpeakoutput
Undesired Sideband Suppression:Atleast60dBbelowpeakoutput
Bandwidth: 3kHz(LSB/USB),500Hz(CW),6kHz(AM),16kHz(FM)
Audio Response(SSB): Notmorethan–6dBfrom300to2700Hz
Microphone Impedance: 600Ohms(200to10kOhms)

FT-710 Technical SupplementSPESIFICATIONS -2
Specications
Receiver
Circuit Type: DirectSamplingSuperheterodyne
Intermediate Frequencies: SSB,CW:18kHz/AM,FM:24kHz
Sensitivity: SSB,CW(BW:2.4kHz,10dBS+N/N)
 1.8MHz-30MHz 0.16µV(IPO:AMP2)
50MHz - 54MHz 0.125µV (IPO:AMP2)
70MHz - 70.5MHz 0.16µV (IPO:AMP2)
 AM(BW:6kHz,10dBS+N/N,30%modulation@400Hz)
0.5MHz - 1.8MHz 6.3µV
1.8MHz - 30MHz 2µV (IPO:AMP2)
50MHz - 54MHz 1µV (IPO:AMP2)
70MHz - 70.5MHz 2µV (IPO:AMP2)
 FM(BW:12kHz,12dBSINAD,3.5kHzDEV@1kHz)
28 - 30MHz 0.25µV (IPO:AMP2)
50MHz - 54MHz 0.2µV (IPO:AMP2)
70MHz - 70.5MHz 0.25µV (IPO:AMP2)
Selectivity(typ): Mode –6dB –60dB
 CW(BW:0.5kHz) 0.5kHzorbeer 750Hzorless
 SSB(BW:2.4kHz) 2.4kHzorbeer 3.6kHzorless
AM(BW:6kHz) 6kHzorbeer 15kHzorless
 FM(BW:12kHz) 12kHzorbeer 25kHzorless
Image Rejection: 70dBorbeer(1.8MHz-28MHzAmateurbands)
 60dBorbeer(50MHzAmateurband)
Maximum Audio Output: 2.5Winto4Ohmswith10%THD
Audio Output Impedance: 4to16Ohms(4Ohms:nominal)
Conducted Radiation: Lessthan4nW
Specications are subject to change, in the interest of technical improvement, without notice or obligation,
and are guaranteed only within the amateur bands.

EXPLODED VIEW -1 FT-710 Technical Supplement
Exploded View
*Accessory with RA6422300 KNOB MAIN ASSY
REF. YAESU P/N Description Qty.
U9900328 RAMIMAIT TAPTITE-B M2.6X6B 2
U24105001 BIND HEAD TAPTITE-B M2X5(3) 2
U24208007 BIND HEAD TAPTITE-B M2.6X8B 9
U24205001 BIND HEAD TAPTITE-B M2.6X5 6
U34308001 FLAT HEAD TAPTITE-B M3X8 4
Non-designated parts are available only as part of a designated assembly.
RA640290A
FRONT PANEL(PRT)
R7155600 (4 pcs)
HIMERON
U70015001
PLAIN WASHER FW9X14X0.5
U62009001
VOLUME NUT 9X12X2
RA6403600
LEVER
U9900211
WAVE WASHER WW-16011(SUS)
RA6074800
HOLDER (SPRING)
RA6358900
RUBBER RING (MAIN)
RA6422300
KNOB MAIN ASSY
RA1528400
WASHER (PE)
RA152820A
WASHER (FELT)
RA6400000
VOLUME KNOB
RA6400100
ENCODER KNOB (MULTI)
RA6400200
ENCODER KNOB (SUB)
RA6402000
RUBBER KNOB (TOP)
RA6400700
HOLDER RUBBER
RA6403100
LIGHT GUIDE (PWR)
RA6403200
LIGHT GUIDE (VOX)
RA6403500
LIGHT GUIDE (MCH)
RA6403300
LIGHT GUIDE (MAIN)
RA6403300
LIGHT GUIDE (MAIN)
RA6403400
LIGHT GUIDE (TX)
RA6402100
RUBBER KNOB (PWR)
RA6402200
RUBBER KNOB (MAIN)
RA6402400
RUBBER KNOB (R)
RA640230A
RUBBER KNOB (L)
RA6405100 (6 pcs)
LCD SPACER (B)
RA6400800 (3 pcs)
PANEL FRAME
RA6419100
PORON SHEET (D9)
RA6419000
PORON SHEET (D6)
RA1145500
CAPTON TAPE (15X10)
RA6419000
PORON SHEET (D6)
RA6400800
PANEL FRAME
Q7001001
LCD MODULE
RA6405000
LCD SPACER (A)
RA6035100
LEAF SPRING
RA6419200
PORON SHEET (101012)
T9207942
WIRE ASSY:AH068H-40MM6P
RA6358300
DOUBLE FACE TAPE
RA6434100
SHIELD CASE (DISP)
Q9001000
ROTARY ENCODER REL20-50LD
DISPLAY-UNIT L9190239
FERRITE CORE:FPCR17-9-0.5
T9207660
WIRE ASSY AH046H 110MM30P
T9207491A
WIRE ASSY AH036H 110MM24P
CS2716701
JACK-ASSY
CS2715701
DISPLAY-ASSY

EXPLODED VIEW -2 FT-710 Technical Supplement
Exploded View
REF. YAESU P/N Description Qty.
U9900369 OVAL HEAD SCREW:M3X6B(ALOCK) 18
U24206001 BIND HEAD TAPTITE-B M2.6X6 38
U9900272 PAN HEAD TAPTITE-B HM3X8(3) 3
U02310001 OVAL HEAD SCREW:M3X6B(ALOCK) 4
U24208007 BIND HEAD TAPTITE-B M2.6X8B 3
U24308001 BIND HEAD TAPTITE-B M3X8 2
U04410002 SEMS SCREW HSM4X10NI 1
U04333007 SEMS SCREW HSM3X33B 4
U03106001 SEMS SCREW ASM2X6 4
U20406007 BINDING HEAD SCREW M4X6B 2
Non-designated parts are available only as part of a designated assembly.
RA6401300
TOP CASE
RA6401000
SHIELD PLATE (PA)
RA6445900
PORON SHEET(10104)
RA6311500
SPONGE RUBBER (SP)
RA6405400
BLIND SHEET (SP2)
RA6396000
CHASSIS
RA602540A
PORON SHEET (10x115)
T9207971A
WIRE ASSY
S5000320A
FAN GUARD G60-4
M4090264
SPEAKER
M2090073
FAN
RA6443100 (4 pcs)
LEG
RA6400900
SP HOLDER
P1091158C
CONNECTOR
RA6405200
DISPLAY PANEL
RA089840A
SP NET
RA602540A
PORON SHEET (10x115)
RA6334300
ThermalConductivePad
PA-UNIT
RA6405300
BLIND SHEET (SP)
RA6419300
SPONGE RUBBER
PA-UNIT
Connect to J1002 on the MAIN-Unit
T9207491A
WIRE ASSY
T9207926
WIRE ASSY
Connect to J1001 on the MAIN-Unit
T92079970
WIRE ASSY
Connect to J1005 on the MAIN-Unit
T9207840
WIRE ASSY
Connect to J3001 on the MAIN-Unit
Connect to J3004 on the MAIN-Unit
Connect to J2607 on the MAIN-Unit
RA6401200
BOTTOM CASE
R3100700B
FOOT
S4000061
SNAP-IN PLA FOOT:TP-4
R0145630
STAND
RA6443100
LEG
RA6443100
LEG
RA6443100
LEG
RA6119900
GASKET (6x6x12)
RA6468600
GASKET (2530)
RA6443100
LEG
RA6035100
LEAF SPRING
RA6143800
GASKET (5X10)
RA6334500
ThermalConductivePad
RA6334400
ThermalConductivePad
TT9207967
WIRE ASSY
RA6119900
GASKET (6x6x12)
RA6445600
GASKET (103010)
RA6452000
GASKET (101010)
L9190238
FERRITE PLATE:FT111-08
RA0459300
SHIELD SHEET
RA6405500
GASKET (USB)
TT9207972
WIRE ASSY
Connect to J7002 on the JACK-Unit
CS2712704 DST: USA
CS2712705 DST: EU
MAIN-ASSY
CQ1350001
BOTTOM-CASE-ASSY
CQ1349001
TOP-CASE-ASSY
CS2714701 DST: USA
CS2714702 DST: EU
PA-ASSY

BLOCK DIAGRAM -1 FT-710 Technical Supplement
Block Diagram

CONNECTION DIAGRAM -1 FT-710 Technical Supplement
Connection Diagram

Alignment
FT-710 Technical SupplementALIGNMENT -1
Introduction and Precautions
RealignmentmAyberequiredafterthecomponents
havebeenreplaced.
WerecommendthatauthorizedYaesuTechnicians,
whoareexperiencedwiththecircuitryandfully
equippedtoalignourproducts,performaligns.
Thosewhodoundertakeanyofthefollowing
alignmentsarecautionedto proceed at theirown
risk.Problemscausedbyunauthorizedaemptsat
realignmentarenotcoveredbythewarrantypoli-
cy.
Theneedforrealignmentshouldbedeterminedto
be absolutely necessary.
Thefollowing test equipment (and a thorough fa-
miliaritywithitscorrectuse)isnecessaryforcor-
rectrealignment. Most steps do not require allof
theequipmentlisted.Theinteractionsofsomead-
justmentsmAyrequirethatmorecomplex adjust-
mentsbeperformedinasequence.Donotaempt
toperformonlyasinglestepunlessitisclearlyiso-
latedelectricallyfromallothersteps.Havealltest
equipmentreadybeforebeginning, and follow all
ofthestepsinasectionintheordertheyarepre-
sented.
Required Test Equipment
 RFSignalGenerator
 AFSignalGenerator
 SpectrumAnalyzergoodtoatleast1GHz.
 FrequencyCounter
 SINADMeter
 RFMillivoltmeter
DC Voltmeter
DC Ammeter (30A)
 16-OhmDummyLoad(100was)
 50-OhmDummyLoad(100was)
 100-OhmDummyLoad(200was)
 150-OhmDummyLoad(100was)
 In-LineWameter(150was,50-Ohm)
 4-OhmAFDummyLoad(3was)
 1/4-inch3-contactPlug
Important Notice
Donotadjustthealignmentmenusthatarenot
mentionedinthismAnual.
Alignment Preparation & Precautions
A50-ohm RF Dummyload and in-line wameter
mustbeconnectedtothe“ANT”jackinallproce-
duresthatcallfortransmission,exceptwherespec-
ifiedotherwise. Correctalignmentisnotpossible
withanantenna.
Aftercompletingonestep,readthefollowingstep
todeterminewhetherthesametestequipment
willberequired.Ifnot,removetheunneededtest
equipmentbeforeproceeding.(exceptthedummy
loadandwameter).
Correctalignmentrequiresthattheambienttem-
peraturebemAintainedconstantbetween68°Fto
86°F(20°Cto30°C).Whenthetransceiveris
broughtintotheshopfromahotorcoldenviron-
ment,itshouldbeallowedtimeto come to room
temperaturebeforealignment.Also,thetestequip-
mentmustbethoroughlywarmedupbeforebegin-
ning.
Wheneverpossible,alignmentsshouldbemAde
withoscillatorshieldsandcircuitboardsrmlyaf-
xedinplace.
Note:Signal levelsin dB referredto in thisproce-
durearebasedon0dBµV=0.5µV(closedcir-
cuit).

Alignment
FT-710 Technical SupplementALIGNMENT -2
REF OSC Adjustment
 ConnectthefrequencycountertoTP1005on
themAINUnit.
 Pressandholdinthe[BAND],[QMB]and
[NAR]keys,whileturningtheradioON,toen-
terthealignmentmode.
 Rotatethe[FUNC]knobtoselectthealignment
parameter“003[GN]REFFREQ”.
 Rotatethe[STEP/MCH(DSP)]knobsothat
thefrequencycounterreadingis“250.000000
±20Hz”.
 Pressandholdthe[FUNC]knobtosavethe
newseing.
TP1005

Alignment
FT-710 Technical SupplementALIGNMENT -3
RF AGC Adjustment
 Pressandholdinthe[BAND],[QMB]and
[NAR]keys,whileturningtheradioON,toen-
terthealignmentmode.
1. Rotatethe[FUNC]knob to select the align-
mentparameter“023[RX]RF-AGC7”.
2. Rotatethe [STEP/MCH (DSP)] knob so that
theparameterindication“255”.
 PerformthesameproceduresfortheAlignment
parameter“024[RX]RF-AGC14”through“027
[RX]RF-AGC50”.
IF AGC Adjustment
 ConnecttheAFmillivoltmeterand4Ohm
dummyloadtotheEXTSPKRjack.
 ConnecttheRFSignalGeneratortotheANT
jack,thensettheoutputlevelto40dBµV.
 Adjustthe[AFGAIN]knobsothattheAFmil-
livoltmeterreadingis“0dB”.
 SettheRFSignalGeneratoroutputlevelto
10dBµV.
 Pressandholdinthe[BAND],[QMB]and
[NAR]keys,whileturningtheradioON,toen-
terthealignmentmode.
 Selecttheappropriate“AlignmentParameter”
usingthe[FUNC]knobperthechartbelow,
thensettheRFSignalGeneratoroutputtoeach
frequency& level,andadjust the [STEP/MCH
(DSP)]knobforthecorrespondingAFmillivolt-
meterreadingateachfrequency.
Alignment
Parameter
RF Signal
Generator Frequency AF
Millivoltmeter
028 [RX] IF-AGC 7 7.150MHz
10dBµV 7.150MHz
-2.0dB ± 0.5dB
029 [RX] IF-AGC 14 14.200MHz
10dBµV 14.200MHz
030 [RX] IF-AGC 21 21.200MHz
10dBµV 21.200MHz
031 [RX] IF-AGC 28 28.100MHz
10dBµV 28.100MHz
032 [RX] IF-AGC 50 50.500MHz
10dBµV 50.500MHz
 Pressandholdinthe[FUNC]knobtosavethe
newseing.
S-meter Adjustment
 Setthefollowingcontrolsasindicated:
 [IPO]:AMP1
 [ATT]:OFF
 [WIDTH]:2.4kHz
 ConnecttheRFSignalGeneratortotheANT
jack,thensetthefrequencyto14.200MHz.
 Pressandholdinthe[BAND],[QMB]and
[NAR]keys,whileturningtheradioON,toen-
terthealignmentmode.
 Selecttheappropriate“AlignmentParame-
ter”usingthe[FUNC]knobperthechartbelow,
thensettheRFSignalGeneratoroutputtoeach
frequency& level,andadjust the [STEP/MCH
(DSP)]knobforthecorrespondingS-meter
readingateachfrequency.
Alignment Parameter RF Signal Generator S-meter
033 [RX] S-MTR 0 OFF Parameter “0”
034 [RX] S-MTR 2 +16dBµV S2
035 [RX] S-MTR 5 +24dBµV S5
036 [RX] S-MTR 7 +30dBµV S7
037 [RX] S-MTR 9 +36dBµV S9
038 [RX] S-MTR +10 +46dBµV S9+10
039 [RX] S-MTR +20 +56dBµV S9+20
040 [RX] S-MTR +30 +66dBµV S9+30
041 [RX] S-MTR +40 +76dBµV S9+40
042 [RX] S-MTR +50 +86dBµV S9+50
043 [RX] S-MTR +60 +96dBµV S9+60
 Pressandholdinthe[FUNC]knobtosavethe
newseing.