Icom IC-910H service manual CH 1H

Page 68

[MAIN UNIT] — UX-910

REF	ORDER		DESCRIPTION
NO.	NO.		DESCRIPTION
NO.	NO.

C287	4030006880	S.CERAMIC	C1608	JB 1H 472K-T-A
C288	4030009530	S.CERAMIC	C1608	CH	1H 030B-T-A
C289	4030007090	S.CERAMIC	C1608	CH	1H 470J-T-A
C290	4030007090	S.CERAMIC	C1608	CH	1H 470J-T-A
C292	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
C293	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
C294	4030006880	S.CERAMIC	C1608	JB 1H 472K-T-A
C295	4030006880	S.CERAMIC	C1608	JB 1H 472K-T-A
C297	4030009520	S.CERAMIC	C1608	CH	1H 020B-T-A
C298	4030009540	S.CERAMIC	C1608	CH	1H 1R5B-T-A
C299	4030009550	S.CERAMIC	C1608	CH	1H 2R5B-T-A
C300	4030009550	S.CERAMIC	C1608	CH	1H 2R5B-T-A
C301	4030009540	S.CERAMIC	C1608	CH	1H 1R5B-T-A
C302	4030006880	S.CERAMIC	C1608	JB 1H 472K-T-A
C304	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
C305	4030007090	S.CERAMIC	C1608	CH	1H 470J-T-A
C306	4030007010	S.CERAMIC	C1608	CH	1H 100D-T-A
C310	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
C311	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
C312	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
C313	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
C314	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
C315	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
C316	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
C317	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
C318	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
C320	4030009920	S.CERAMIC	C1608	CH	1H	050B-T-A
C321	4030007010	S.CERAMIC	C1608	CH	1H	100D-T-A
C322	4030007090	S.CERAMIC	C1608	CH	1H	470J-T-A
C323	4030007130	S.CERAMIC	C1608	CH	1H	101J-T-A
C324	4030007010	S.CERAMIC	C1608	CH	1H	100D-T-A
C325	4030007090	S.CERAMIC	C1608	CH	1H	470J-T-A
C326	4030007090	S.CERAMIC	C1608	CH	1H	470J-T-A
C327	4030007130	S.CERAMIC	C1608	CH	1H	101J-T-A
C328	4030007010	S.CERAMIC	C1608	CH	1H	100D-T-A
C329	4030007090	S.CERAMIC	C1608	CH	1H	470J-T-A
C330	4030007130	S.CERAMIC	C1608	CH	1H	101J-T-A
C331	4030007010	S.CERAMIC	C1608	CH	1H	100D-T-A
C332	4610001190	S.TRIMMER	ECR-JA003 A11W
C333	4030007010	S.CERAMIC	C1608	CH	1H	100D-T-A
C334	4030007010	S.CERAMIC	C1608	CH	1H	100D-T-A
C335	4030007010	S.CERAMIC	C1608	CH	1H	100D-T-A
C336	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
C337	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
C501	4030006850	S.CERAMIC	C1608	JB 1H 471K-T-A
C502	4030006850	S.CERAMIC	C1608	JB 1H 471K-T-A
C503	4550006350	S.TANTALUM	TEMSVB2 1A 226M-8L
C504	4030006880	S.CERAMIC	C1608	JB 1H 472K-T-A
C505	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
C506	4030007010	S.CERAMIC	C1608	CH 1H		100D-T-A
C507	4030011600	S.CERAMIC	C1608	JB 1C 104KT-N
C508	4030006850	S.CERAMIC	C1608	JB 1H 471K-T-A
C509	4030011600	S.CERAMIC	C1608	JB 1C 104KT-N
C510	4340000020	S.MYLAR	ECWU 1C 333JB5
C511	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
C512	4550006360	S.TANTALUM	ECST1VY104R
C513	4550006360	S.TANTALUM	ECST1VY104R
C514	4030006880	S.CERAMIC	C1608	JB 1H 472K-T-A
C515	4030006850	S.CERAMIC	C1608	JB 1H 471K-T-A
C516	4550003220	S.TANTALUM	TEMSVA 1E 105M-8L
C517	4550003220	S.TANTALUM	TEMSVA 1E 105M-8L
C518	4550006170	S.TANTALUM	ECST1AY225R
C520	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
C522	4030011600	S.CERAMIC	C1608	JB 1C 104KT-N
C523	4030006850	S.CERAMIC	C1608	JB 1H 471K-T-A
C524	4550003220	S.TANTALUM	TEMSVA 1E 105M-8L
C531	4510005940	ELECTROLYTIC	10 MV 470 HC
C532	4030010210	S.CERAMIC	C3216	JB 1C 105M-T-A
C533	4550003220	S.TANTALUM	TEMSVA 1E 105M-8L
C534	4030006850	S.CERAMIC	C1608	JB 1H 471K-T-A
C535	4030011600	S.CERAMIC	C1608	JB 1C 104KT-N
C536	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
C537	4030007090	S.CERAMIC	C1608	CH 1H		470J-T-A
C538	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
C541	4030011770	S.CERAMIC	C1608	CH 1H		060B-T-A
C542	4030009500	S.CERAMIC	C1608	CH 1H		0R5B-T-A
C543	4030009540	S.CERAMIC	C1608	CH 1H		1R5B-T-A
C544	4030009540	S.CERAMIC	C1608	CH 1H		1R5B-T-A
C545	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
C546	4030009500	S.CERAMIC	C1608	CH 1H		0R5B-T-A
C548	4030007010	S.CERAMIC	C1608	CH 1H		100D-T-A
C549	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A

[MAIN UNIT] — UX-910

	REF	ORDER	DESCRIPTION
	NO.	NO.	DESCRIPTION
	NO.	NO.

	C550	4030007010	S.CERAMIC	C1608	CH 1H	100D-T-A
	C551	4030007090	S.CERAMIC	C1608	CH 1H	470J-T-A
	C552	4030007090	S.CERAMIC	C1608	CH 1H	470J-T-A
	C561	4030007050	S.CERAMIC	C1608	CH 1H	220J-T-A
	C562	4030007050	S.CERAMIC	C1608	CH 1H	220J-T-A
	C563	4030007050	S.CERAMIC	C1608	CH 1H	220J-T-A
	C564	4030007050	S.CERAMIC	C1608	CH 1H	220J-T-A
	C571	4030009920	S.CERAMIC	C1608	CH 1H	050B-T-A
	C572	4030007020	S.CERAMIC	C1608	CH 1H	120J-T-A
	C573	4030009520	S.CERAMIC	C1608	CH 1H	020B-T-A
	C574	4030007070	S.CERAMIC	C1608	CH 1H	330J-T-A
	C575	4030009530	S.CERAMIC	C1608	CH 1H	030B-T-A
	C581	4030009550	S.CERAMIC	C1608	CH 1H	2R5B-T-A
	C582	4030009510	S.CERAMIC	C1608	CH 1H	010B-T-A
	C583	4030009520	S.CERAMIC	C1608	CH 1H	020B-T-A
	C584	4030009570	S.CERAMIC	C1608	CH 1H	0R3B-T-A
	C585	4030009530	S.CERAMIC	C1608	CH 1H	030B-T-A
	C603	4030007130	S.CERAMIC	C1608	CH 1H	101J-T-A
	C604	4030007140	S.CERAMIC	C1608	CH 1H	121J-T-A
	C605	4030006880	S.CERAMIC	C1608	JB 1H 472K-T-A
	C606	4030006880	S.CERAMIC	C1608	JB 1H 472K-T-A
	C607	4030012600	S.CERAMIC	C2012	JB 1A 105M-T-A
	C608	4030011600	S.CERAMIC	C1608	JB 1C 104KT-N
	C609	4030011600	S.CERAMIC	C1608	JB 1C 104KT-N
	C610	4030007170	S.CERAMIC	C1608	CH 1H	221J-T-A
	C611	4030011280	S.CERAMIC	C1608	CH 1H	271J-T-A
	C612	4030007120	S.CERAMIC	C1608	CH 1H	820J-T-A
	C613	4030006880	S.CERAMIC	C1608	JB 1H 472K-T-A
	C614	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
	C621	4030011600	S.CERAMIC	C1608	JB 1C 104KT-N
	C622	4030011600	S.CERAMIC	C1608	JB 1C 104KT-N
	C623	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
	C624	4030012600	S.CERAMIC	C2012	JB 1A 105M-T-A
	C641	4030009920	S.CERAMIC	C1608	CH 1H	050B-T-A
	C642	4030009550	S.CERAMIC	C1608	CH 1H	2R5B-T-A
	C643	4030009910	S.CERAMIC	C1608	CH 1H	040B-T-A
	C644	4030007050	S.CERAMIC	C1608	CH 1H	220J-T-A
	C645	4030007110	S.CERAMIC	C1608	CH 1H	680J-T-A
	C651	4030007090	S.CERAMIC	C1608	CH 1H	470J-T-A
	C652	4030009990	S.CERAMIC	C1608	CH 1H	200J-T-A
	C653	4030007110	S.CERAMIC	C1608	CH 1H	680J-T-A
	C654	4030007010	S.CERAMIC	C1608	CH 1H	100D-T-A
	C655	4030007120	S.CERAMIC	C1608	CH 1H	820J-T-A
	C656	4030009350	S.CERAMIC	C1608	CH 1H	3R5B-T-A
	C657	4030007100	S.CERAMIC	C1608	CH 1H	560J-T-A
	C661	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
	C662	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
	C663	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
	C664	4030011600	S.CERAMIC	C1608	JB 1C 104KT-N
	C665	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
	C666	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
	C667	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
	C668	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
	C669	4030011600	S.CERAMIC	C1608	JB 1C 104KT-N
	C670	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
	C671	4030011600	S.CERAMIC	C1608	JB 1C 104KT-N
	C672	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
	C673	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
	C674	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
	C675	4510004630	S.ELECTROLYTIC	ECEV1CA100SR
	C676	4030011600	S.CERAMIC	C1608	JB 1C 104KT-N
	C677	4030011600	S.CERAMIC	C1608	JB 1C 104KT-N
	C678	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
	C679	4030011600	S.CERAMIC	C1608	JB 1C 104KT-N
	C680	4510007130	S.ELECTROLYTIC	EEFCD 0J 470R
	C685	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
	C686	4030007090	S.CERAMIC	C1608	CH 1H	470J-T-A
	C687	4030006850	S.CERAMIC	C1608	JB 1H 471K-T-A
	C688	4030007010	S.CERAMIC	C1608	CH 1H	100D-T-A
	C689	4030011600	S.CERAMIC	C1608	JB 1C 104KT-N
	C702	4030006850	S.CERAMIC	C1608	JB 1H 471K-T-A
	C704	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
	C705	4510004630	S.ELECTROLYTIC	ECEV1CA100SR
	C706	4550006300	S.TANTALUM	ECST1AY475R
	C707	4550006300	S.TANTALUM	ECST1AY475R
	C708	4550006170	S.TANTALUM	ECST1AY225R
	C709	4030006850	S.CERAMIC	C1608	JB 1H 471K-T-A
	C710	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
	C711	4550006080	S.TANTALUM	TEMSVB2 1C 106M-8L
	C712	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
	C713	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A
	C715	4030006860	S.CERAMIC	C1608	JB 1H 102K-T-A

S.=Surface mount

6 - 29

Image 68

Contents Service Manual Introduction Ordering PartsRepair Notes EURTable of Contents Specifications GeneralReceiver Section Inside ViewsMain and PLL Units FM if ICPA Unit PLL IC TOP ViewBottom View UX-910 1200MHz Band Unit Disassembly and Option InstructionsOpening the transceiver’s case Main SUB Opening the PA unit coverFL-132/FL-133 CW Narrow Filter Installing 1st DSP unit front panel side Installing 2nd DSP unit rear panel sideUT-102 Voice Synthesizer Unit UT-106 DSP UnitCR-293 High Stability Crystal Unit Circuit Description Receiver Circuit6 10 MHz if Circuit Main Unit Demodulator Circuit Main UnitSquelch Control Circuit Main Unit Squelch Circuit Main UnitTransmitter Circuits Noise Blanker Circuit Main UnitAGC Circuit Main Unit Meter Circuit Main UnitTransmit if Amplifier Circuit Main Unit Modulation Circuit Main UnitCW Keying Circuit Main Unit RF Circuit PA UnitPLL Circuits 8 2LO PLL Circuit PLL Circuits7 1LO PLL Circuit Adjustment Procedures Preparation Before SarvicingRequired Test Equipment ‘ ConnectionsPLL Adjustments Frequency AdjustmentPLL and Main Units Receiver Adjustments R547 P501L353 L354 R360EXT NoiseBlanker Main Band OFFL283 L22CP851 CP852Transmitter Adjustments R503 C659R138 R131If Total Main GainGND LO LeakR504 R202CP1613 R1613Software Adjustment Software Adjustment MeterNoise SQL Filter CalibrationTX Power LPF DeviationHPF OFF UX-910 Adjustments CP321 CP322C332 R13Power SET APCPre-setting for APC adjustment Display Board Section Parts ListFront Unit Resistor ERA3YED VR-B Board Func BoardVR-A Board RIT Board Jack BoardMIC Board PLL UnitResistor ERA3YEB Thermistor Tantalum ECST1AD107R Main Unit REG BA09TDiode DAN222TL Resistor ERA3YKD R364 7030003320 R915 7030003520 Tantalum Temsva 1C 335M-8L Electrolytic ECEV1EA4R7SR Electrolytic Relay Diode HSU88TRF Coil Eljre 15NG-F Resistor ERJ1WYJ181U Resistor ERJ1TYJ102U JB 1H JB 1C Mica DRV Board BARISTOR-A BoardVARISTOR-B Board BARISTOR-C Board2UX-910MAIN Unit Main Unit UX-910Resistor RGB3L R15 Resister ERA3YED Tantalum ECST1CC226R CH 1H Connectot 25FMN-BTK Mechanical Parts Display UnitCover Parts Chassis PartsUnpacking UX-910 Chassis PartsUX-910 Main Unit UX-910 UnpackingSEMI-CONDUCTOR Information Transistors and FET’SDTA114 EE TL Diodes MA29BSection Board Layouts Page Icom America Inc 13714HZ-C1

IC-910H specifications

The Icom IC-910H is a highly regarded and versatile transceiver that is designed for amateur radio operators who are particularly interested in V/UHF and microwave communications. Known for its exceptional performance, the IC-910H encompasses a suite of features that make it a standout choice for both casual and dedicated hams.

One of the main features of the IC-910H is its dual-band capability, allowing for simultaneous operation on both 144 MHz (2 meters) and 430 MHz (70 centimeters) bands. This dual operation enables users to engage in various communication modes, including SSB, CW, FM, and digital. Its high frequency stability ensures that users can rely on the transceiver for accurate and consistent transmissions.

The IC-910H is equipped with a high-performance 10 MHz IF filter that improves selectivity and reduces adjacent channel interference. The optional 1.2 GHz module enhances the transceiver’s capabilities, allowing operators to venture into microwave frequencies. This expandability is a significant advantage for users who wish to progress in their amateur radio pursuits.

Another notable aspect of the IC-910H is its large, easy-to-read LCD display, which features various color options for enhanced visibility. The front panel layout is user-friendly, providing quick access to important controls and functions. The built-in DSP (Digital Signal Processing) technology offers noise reduction and filtering capabilities, significantly improving overall audio quality and making weak signals more intelligible.

The transceiver also includes extensive memory functions, with up to 1,000 memory channels available for storing frequencies, modes, and operational settings. Additionally, it supports CTCSS and DCS tones, which facilitate the use of repeater systems and private group communications.

In terms of build quality, the IC-910H features a robust construction designed for durability and long-term use. Its efficient power supply management ensures excellent performance while minimizing heat generation, making it suitable for extended operating sessions.

Overall, the Icom IC-910H is a powerful and feature-rich transceiver that is favored by many amateur radio enthusiasts. With its versatile operating modes, advanced filtering capabilities, and clear display, it stands out as a reliable tool for both casual operators and serious DXers. Its well-thought-out design and comprehensive features make it a valuable addition to any ham's station collection.