8. READ the instructions of test equipment throughly before connecting a test equipment to the transceiver. Icom, Icom Inc. and logo are registered trademarks of Icom Incorporated (Japan) in the United States, the United Kingdom, Germany, France, Spain, Russia and/or other countries.
• MAIN UNIT (TOP VIEW) (BOTTOM VIEW) 2ND IF FILTER (A BAND) (FI100: LTWC450E1) (B-BAND) IF IC (A BAND) DISCRIMINATOR (IC100: TA31136FNG) (X100: JTBM450) TONE FILTER AF FILTER (IC150: LM2904) (IC502: NJM2904) (B BAND) AF FILTER DISCRIMINATOR (IC501: NJM2904) (X200: JTBM450) TONE SELECTOR (B BAND) (IC703: CD4066)
SECTION 3 DISASSEMBLY INSTRUCTION 1. Removing the front panel 2. Removing the FRONT UNIT q Unscrew 6 screws from the CHASSIS. q Unscrew 8 screws from the FRONT UNIT. w Disconnect the flat cable between MAIN UNIT and w Unsolder 2 points to remove the speaker leads, then FRONT assembly, and remove the FRONT assembly from remove the FRONT UNIT from the front panel.
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4. Removing MAIN UNIT 5. Removing RF UNIT q Unscrew 3 screws from the MAIN UNIT. q Unsolder 4 points at the contact pins. w Unsolder 6 points at the control dial, and remove the w Unsolder 1 point at the bottom of ANT connector. MAIN UNIT.
SECTION 4 CIRCUIT DESCRIPTION • 118–173.995 MHz 4-1 RECEIVER CIRCUITS The RX signals are passed through two LPFs, ANT SW, RF CIRCUITS (RF UNIT) ATT and band SW, then applied to the RF AMP (Q400). The RX signals from the antenna are sorted by its frequency by amplified RX signals are passed through the tuned BPF, the filters and gone through RF circuits for each bands.
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• 600–999.990 MHz <B BAND> The RX signals are passed through the HPF, band SW, ATT • 118–173.995 MHz and tuned BPF in sequence, then applied to the RF AMP The RX signals for B BAND are passed through 2 LPFs, (Q700).
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2ND IF AND DEMODULATOR CIRCUITS <B BAND> The 1st IF signal from the 1st IF AMP (Q200) is applied to (MAIN UNIT) the IF IC (IC200). The applied 1st IF signal is mixed with <A BAND> 45.9 MHz 2nd LO signal (generated by X450, tripled by The 1st IF signal from the 1st IF AMP (Q100) is applied to Q451) at the internal 2nd mixer, to be converted into the the IF IC (IC100).
RX AF CIRCUITS (LOGIC UNIT) SQUELCH CIRCUIT <A BAND> The squelch circuit cuts off the AF output signals when The AF signals from the FM/AM demodulator circuits are no RF signals are received. Detecting noise components passed through the mode SW (M: IC500D) and one of the (approx.
• DV MODE 4-2 TRANSMIT CIRCUITS The MIC signals from the microphone (MC300) are passed TX AF CIRCUITS (LOGIC UNIT) through the MIC gain SW (Q303) and applied to the MIC • FM MODE AMP (Q302, 304). The amplified MIC signals are applied MIC signals from the internal/external microphone (MIC to the ALC AMP (IC300) which automatically adjusts the signals) are passed through the MIC gain SW (Q303),...
APC CIRCUIT (RF UNIT) The output voltage is applied to the ATT (D158, 159) to con- The APC (Automatic Power Control) circuit stabilizes trol the attenuation level, to adjust the input level of the YGR transmit output power to prevent transmit output power level AMP (Q102) so that the TX output power is stable.
4-4 CPU PORT ALLOCATION LINE DESCRIPTION IN/OUT STATUS CONDITION NAME POWER [POWER] key input. (Pull-up). – PKEY [PWR] key input (Pull-up). The key is pushed DICK [DIAL] input(Phase A). – – DIUD [DIAL] input(Phase B). – – [PTT] key input (Pull-down). The key is pushed [SQL] key input (Pull-up).
4-4 CPU PORT ALLOCATION (continued) LINE DESCRIPTION IN/OUT STATUS CONDITION NAME DASTB1 Strobe signal to the DAC (R: IC950). – – DASTB2 Strobe signal to the DAC (M: IC600). – – IOSTB1 Strobe signal to the expander (R: IC951). – –...
SECTION 5 ADJUSTMENT PROCEDURE 5-1 PREPARATION ¤ REQUIRED INSTRUMENTS INSTRUMENTS SPECIFICATION INSTRUMENTS SPECIFICATION DC Cable OPC-254L (Optional product) JIG cable (See the illust below) Output voltages : 5.0–13.5 V DC Input impedance : 50 kΩ Power Supply Multimeter Current capacity : More than 3 A Measuring range : 0.1–10V/0.01–5 A...
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M ENTERING ADJUSTMENT MODE q Turn the power OFF. w Connect the JIG cable to the [DATA/SP/MIC] jack. e While pushing [SQL] and [8] keys, turn the power ON. (4 (4 Adjustment item Adjustment value #(/ #(/ Band: Mode [SQL] Adjustment frequency ...
5-2 TRANSMIT AMPLIFIER ADJUSTMENT Select an adjustment item using [2] / [8] keys, then set the adjustment value as specifi ed using [DIAL]. ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITION OPERATION VALUE ITEM IDLING CURRENT 0 • Supply voltage : 5.0 V 1) Connect an RF power meter (@5.0 V) to the antenna connector.
5-2 TRANSMIT AMPLIFIER ADJUSTMENT (continued) Select an adjustment item using [2] / [8] keys, then set the adjustment value as specifi ed using [DIAL]. ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITION OPERATION VALUE ITEM IDLING 0 • Supply voltage : 7.4 V 1) Connect an RF power meter CURRENT (@7.4 V) to the antenna connector.
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5-2 TRANSMIT AMPLIFIER ADJUSTMENT (continued) Select an adjustment item using [2] / [8] keys, then set the adjustment value as specifi ed using [DIAL]. ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITION OPERATION VALUE ITEM TRANSMIT 0 • Supply voltage : 7.4 V 1) Connect an RF power meter POWER (@7.4 V) to the antenna connector.
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5-2 TRANSMIT AMPLIFIER ADJUSTMENT (continued) Select an adjustment item using [2] / [8] keys, then set the adjustment value as specifi ed using [DIAL]. ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITION OPERATION VALUE ITEM TRANSMIT 0 • Supply voltage : 7.4 V 1) Connect an RF Power Meter POWER (@7.4 V) to the antenna connector.
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5-2 TRANSMIT AMPLIFIER ADJUSTMENT (continued) Select an adjustment item using [2] / [8] keys, then set the adjustment value as specifi ed using [DIAL]. ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITION OPERATION VALUE ITEM IDLING 0 • Supply voltage : 13.5 V 1) Connect an RF Power Meter CURRENT (@13.5 V) (supplying from [DC IN]) to the antenna connector.
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5-2 TRANSMIT AMPLIFIER ADJUSTMENT (continued) Select an adjustment item using [2] / [8] keys, then set the adjustment value as specifi ed using [DIAL]. ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITION OPERATION VALUE ITEM TRANSMIT 0 • Supply voltage : 13.5 V • Connect an RF Power Meter POWER (@13.5 V) (supplying from [DC IN]) to the antenna connector.
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5-2 TRANSMIT AMPLIFIER ADJUSTMENT (continued) Select an adjustment item using [2] / [8] keys, then set the adjustment value as specifi ed using [DIAL]. ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITION OPERATION VALUE ITEM TRANSMIT POWER • Supply voltage : 13.5 V 1) Connect an RF Power Meter (@13.5 V) (supplying from [DC IN]) to the antenna connector.
5-3 FREQUENCY ADJUSTMENT Select an adjustment item using [2] / [8] keys, then set the adjustment value as specifi ed using [DIAL]. ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITION OPERATION VALUE ITEM REFERENCE • Displayed freq. : " " 1) C o n n e c t a n R F t o t h e FREQUENCY •...
5-4 DEVIATION ADJUSTMENTS Select an adjustment item using [2] / [8] keys, then set the adjustment value as specifi ed using [DIAL]. ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITION OPERATION VALUE ITEM FM DEVIATION 0 • Supply voltage : 7.4 V 1) C o n n e c t a M o d u l a t i o n [PREPARATION] A n a l y ze r t o t h e a n t e n n a c o n n e c t o r t h r o u g h a n...
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5-4 DEVIATION ADJUSTMENTS (continued) Select an adjustment item using [2] / [8] keys, then set the adjustment value as specifi ed using [DIAL]. ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITION OPERATION VALUE ITEM DIGITAL VOICE 0 • Supply voltage : 7.4 V • Connect a Modulation Analyzer DEVIATION t o t h e a n t e n n a c o n n e c t o r –...
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5-4 DEVIATION ADJUSTMENTS (continued) Select an adjustment item using [2] / [8] keys, then set the adjustment value as specifi ed using [DIAL]. ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITION OPERATION VALUE ITEM DTMF, European 0 • Supply voltage : 7.4 V • C o n n e c t a M o d u l a t i o n tone, CTCSS, DTCS A n a l y z e r t o t h e a n t e n n a –...
5-5 RECEIVE ADJUSTMENTS CAUTION: DO NOT transmit while an SSG is connected to STANDARD SIGNAL GENERATOR the antenna connector. (0.1–1000 MHz) JIG cable (See the page 5-1) 7.4 V DC power supply Be sure the polarity. − ⊕ To the battery contact pins –...
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RECEIVE ADJUSTMENT (continued) 1) Select an adjustment item using [2] / [8] keys. 2) Set the SSG as specifi ed (frequency, deviation and output level). 3) Push the [BAND] key to adjust (automatic) and store the adjustment value. ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITION OPERATION VALUE...
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RECEIVE ADJUSTMENT (continued) 1) Select an adjustment item using [2] / [8] keys. 2) Set the SSG as specifi ed (frequency, deviation and output level). 3) Push the [BAND] key to adjust (automatic) and store the adjustment value. ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITION OPERATION VALUE...
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RECEIVE ADJUSTMENT (continued) 1) Select an adjustment item using [2] / [8] keys. 2) Set the SSG as specifi ed (frequency, deviation and output level). 3) Push the [BAND] key to adjust (automatic) and store the adjustment value. ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITION OPERATION VALUE...
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RECEIVE ADJUSTMENT (continued) 1) Select an adjustment item using [2] / [8] keys. 2) Set the SSG as specifi ed (frequency, deviation and output level). 3) Push the [BAND] key to adjust (automatic) and store the adjustment value. ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITION OPERATION VALUE...
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RECEIVE ADJUSTMENT (continued) 1) Select an adjustment item using [2] / [8] keys. 2) Set the SSG as specifi ed (frequency, deviation and output level). 3) Push the [BAND] key to adjust (automatic) and store the adjustment value. ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITION OPERATION VALUE...
SECTION 10 VOLTAGE DIAGRAM LOGIC UNIT D103 R113 MA2S111 C121 R114 0 . 0 1 I C 5 3 MP511 MP512 1.63V C200 C201 VCC+ I N + C202 3066 3066 0 . 0 0 1 2.17V C203 I N- C204 3.32V IC 1 0 4...
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LOGIC UNIT MMZ1005Y102CT EP501 MMZ1005Y102CT R347 R351 EP500 C330 R504 MMZ1005Y102C T EP502 R350 0 . 0 0 1 R601 100K IC 5 0 1 EP503 C510 MMZ1005Y102C T IC 3 0 3 DATA R602 R501 C505 XTAL 0 .1 R505 R506 R507...
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AM:2.83V MAIN UNIT A Other :0.0V A:3.11V A WFM:0.10V A CTCSS ON : 3.14V B:0.4V A CTCSS OFF : 0.0V AAGC R129 U NR9115J C771 C752 C790 C754 C775 C755 C756 C772 C773 C753 C777 R124 C751 Q150 C127 R121 0.47 U NR9115J R120...
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AXK716147G L 2 0 3 LOOUT UVCO3 C208 L 2 0 2 PLLOUT VMOD 2SC500 6 8 . 2 N 0 . 0 0 1 Q202 BCVCO3 C211 C207 V S H I F T C213 VVCO3 L 2 0 1 BCLV C209 C210...
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