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Yaesu FT-712RH Technical Supplement
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Yaesu FT-712RH Technical Supplement

Yaesu FT-712RH Technical Supplement

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FT-712RH
TECHNICAL SUPPLEMENT
YAESU MUSEN CO., LTD.
MFlNURLC DI SERV.
X
C.P.O. BOX 1500
rr-pia RH
05910739
TOKYO, JAPAN

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Summary of Contents for Yaesu FT-712RH

  • Page 1 FT-712RH TECHNICAL SUPPLEMENT YAESU MUSEN CO., LTD. MFlNURLC DI SERV. C.P.O. BOX 1500 rr-pia RH 05910739 TOKYO, JAPAN...
  • Page 2 Because of the compactness and complexity of the double-sided glass-epoxy circuit boards used in the FT-712RH, four layout diagrams are provided for each board. Each side of the board is identified by the type of the majority of components installed on that side.

  • Page 3: Bottom Cover Removal

    BOTTOM COVER REMOVAL The following circuit boards are accessed by removing the bottom cover: Main Unit* (component side) IF Unit* Mic Unit* APC Unit VCO Unit PA Unit (lower edge only) To remove the bottom cover, remove the four screws marked " * " in Figure 1, plus the four marked "...
  • Page 4 PA UNIT APC UNIT 430-VCO UNIT CONTROL UNIT LCD UNIT BOARD LAYOUT...
  • Page 5 MAIN UNIT (No. 1 X X X ) SOURCE DRAIN GATE Marked surface 3SK164(F)(01001) 3SK165(J) (01002) M54959P(01013) pPC7805H(01018) L7809 ( 0 1 0 1 7 ) TDA2003(01008) obverse view of "component" side...
  • Page 6 EMITTER COLLECTOR BASE 2 S B 1 1 3 4 R ( Q 1 0 1 6 ) EMITTER BASE COLLECTOR 2S02407(A)(Q1010) BASE COLLECTOR EMITTER 2SD1000(LL) (Of 007) 2SC3357(RK) (01009) GATE Marked Surface 2SK208Y (JY) (01014) reverse view of "component" side...
  • Page 7 ' C O L L E C T O R Marked surface. 2SA812(M7) (01005) 2SC1623(I_7) (01004,1006,1015) 2SC2620(QB)(01003) 2SC3356(R24) ( 0 1 0 1 1 , 1 0 1 2 ) Marked Surface 1SS184(B3) (D1001) HSM2693(B2) (D1005) A N O D E l/CATHODE 2 1SS226(C3) (D1002) obverse view of "chip-only"...
  • Page 8 reverse view of "chip-only" side...
  • Page 9 MAIN UNIT VOLTAGE CHART (DC VOLTS) MAIN UNIT 1C VOLTAGE CHART (DC VOLTS)
  • Page 10 IF UNIT (No. 4 XX) obverse view of "mixed-component" side obverse view of "chip-only" side reverse view of "mixed-component" side reverse viewof "chip-only" side Marked Surface 2SC1623(L6) (Q402) TK10487M(Q401) M5223FP(Q403) IF UNIT VOLTAGE CHART (DC VOLTS) ^CATHODE CATHODE Marked Suffice 1 S S 1 8 1 ( A 3 ) (D402) ANODE 1/CATHODE 2 Marked Surface...
  • Page 11 MIC UNIT (No. 5 X X ) obverse view of "1C" side obverse view of "chip-only" side reverse view of "1C" side reverse view of "chip-only" side COLLECTOR Marked Surface MPD4052BG(Q502) 2S01 623(1-6) (0503) FA1A4M-T2B(L33) (0504-506) MIC UNIT VOLTAGE CHART (DC VOLTS) ? S »...
  • Page 12 (APC Unit Part Layout/Circuit Diagram APC UNIT (No. 6 XX) obverse view of "Tantalum CAP" side obverse view of "chip-only" side reverse view of "Tantalum CAP" side reverse view of "chip-only" side CATHODE COLLECTOR B«««(Tr,; ANOI Emitfr (Common) ^»< s—crr,)^..'^, IODE ANODE CATHOOE...
  • Page 13 430-VCO UNIT (No. 3 XX) '•^^s^ ^i^i'^ obverse view of "component" side obverse view of "chip-only" side reverse view of "component" side reverse view of "chip-only" side SOURCE DRAIN VCO UNIT VOLTAGE CHART (DC VOLTS) Marked Surface 2SC3356(R24)(0301) 2SK125(0302) RESISTOR VALUES ARE IN 0. 1/tOW; CAPACITOR VALUES ARE IN fF.
  • Page 14 CONTROL UNIT (No. 2 X X X ) rCx^ia'agi! n i w_ - r^-^" obverse view of "mixed-component" side reverse view of "mixed-component" side - 13 -...
  • Page 15 20""""""32 HD404418A01F(02003) obverse view of "1C" side 14 -...
  • Page 16 ANODE 1/CATHOOE 1 ' - : •" ~ •' <• ^ S obverse view of "1C" side...
  • Page 18 PA UNIT (No. 7 XX) obverse view of "component" side reverse view of "component" side...
  • Page 19 obverse view of "chip-only" side reverse view of "chip-only" side...

  • Page 21: Main Unit

    MAIN UNIT...
  • Page 24 Alignement The high reliability of the chip components A 50-ohm dummy load that is non-reactive in the FT-712RH minimize the possibility up to 500 MHz is required. Correct align- that repair or realignment should be needed ment is not possible with an antenna.
  • Page 25 A. PLL Unit 1 ) VCV (Varactor Control Voltage) c) Retune the transceiver to the f r e q u e n c y indicated below and a) With the dummy load connected to a d j u s t TC301 again, this time the ANT jack, connect the DC while transmitting, for the voltage voltmeter (10V scale) to the VCV...
  • Page 26 B. Transmitter 1) Early Stage Coupling Set up the test equipment as shown in a) Tune the transceiver to the center Figure 1. Close the PTT line when making of the band, and set the LOW adjustments. All adjustment points are on button to the high power position.
  • Page 27 4) Deviation d) Adjust VR1006 for 36 watts output. a) Set the AF generator for 25mV e) Press the LOW switch and adjust output at 1 kHz. Adjust VR1003 VR1005 for 5W output. for ± 4 . 5 kHz deviation on the Deviation Meter.
  • Page 28 C. Receiver d) Confirm 12dB SINAD sensitivity of -7.5dBu (0.2 l u V ) or better on the Set up the test equipment as shown in SINADDER. Figure 2. All adjustment points are on the Main Unit. 2) S-Meter Calibration a) At the center of the band, set the signal generator for 30dBu (50uV) injection with ±3.5 kHz deviation...
  • Page 29 R1039 J24205150 RES^Ctnp 1/10W 15 ohm IfiMiaiJill UK , • • . • ..' . .• ' . . . — fmbol R1040 J24205150 RES. Chip 1/10W 15 ohm Part No. Description R1041 J24205683 RES. Chip 1/10W 68k ohm R1042 J24205471...
  • Page 30 [C1053 K22170223 CAP. Chip 33pF H7900180 Ceramic DISC CDB455C7 C1054 CAP. Chip O.OOluF CD401 K22170805 C1055 K40179006 AL. Electro. 2.2uF R401 RES. Chip 1/10W 100 ohm CAP. J24205101 CAP. Chip O.OOluF R402 J24205101 RES. Chip I/10W 100 ohm C1056 K22170805 R403 J24205473 RES.
  • Page 31 R523 J24205104 RES. Chip 1/10W 100k ohm [MlBWUilUN • - Symbol R524 J24205104 RES. Chip I/10W 100k ohm Device tVLl L 1'IU • R525 J24205104 1/10W 100k ohm RES. Chip R526 J24205104 RES. Chip 1/10W 100k ohm F2939101A Printed Circuit R527 J24205394 RES.
  • Page 32 D2001 G2070003 Diode 1SS226 TE85R R2076 J24205154 RES. Chip 1/10W 150k ohm D2002 G2070009 Diode 1SS184 TE85R D2003 G2070009 Diode 1SS184 TE85R VR2001 J60800142 POT. 20k ohm D2004 VR2002 G2070009 Diode 1SS184 TE85R J60800143 POT. 20k ohm D2005 G2070009 Diode 1SS184 TE85R D2006 G2070009...
  • Page 33 470pF L705 L0021359 Coil 'C704 K22170801 CAP. Chip L706 L1190348 M. RFC C706 K22170801 CAP. Chip 470pF L707 L0020428 Coil K40129012 AL. Electro. lOuF C706 J701 P1090599 Connector C707 K22170205 CAP. Chip 0 J702 P1090600 Connector K22170207 CAP. Chip A 470pF J703 P1090603...