IC-910H Service manual - n7tgb

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5-5 TRANSMITTER ADJUSTMENTS ADJUSTMENT PA UNIT PRESETTING IDLING CURRENT (for 144 M) (for 430 M) RF PEAK (for 430 M) (for 144 M) IF PEAK CARRIER SUPPRESSION 1 1 2 3 4 1 2 3 4 1 1 2 3 ADJUSTMENT CONDITION • Preset R131, R135, R150, R650 (PA unit) to max. counter clockwise. • Preset R3, R138, R503 (PA unit) to center position. • Preset C154, C659 (PA unit) to center position as illustration at right. • Display frequency: [EUR], [KOR] 145.0000 MHz [USA-1], [AUS] 146.0000 MHz • Mode : CW • Transmitting • Transmitting • Transmitting • Display frequency: [EUR], [KOR] 435.0000 MHz [USA-1], [AUS] 450.0000 MHz • Mode : CW • Transmitting • Display frequency: 440.0000 MHz • Connect an SSG to P1 on the PA unit via the JIG cable (A) and set as: Frequency : 10.850 MHz Level : 18 mV* (–22 dBm) Modulation: OFF • Transmitting • Set an SSG as: Level : 0.79 µV* (–2 dBm) • Transmitting • Connect an SSG to P501 on the PA unit via the JIG cable (A) and set as: Frequency : 10.850 MHz Level : 18 mV* (–22 dBm) Modulation: OFF • Display frequency: 146.0000 MHz • Set an SSG as: Level : 0.79 µV* (–2 dBm) • Transmitting • Display frequency: Any • Mode : USB • MIC gain : Center • Connect an audio generator to [MIC] connector and set as: Frequency : 1.5 kHz Level : 2 mVrms • Transmitting • Display frequency: Any • Mode : USB • Mic gain : Minimum • Apply no audio signals to [MIC] connector. • Transmitting • Mode : LSB • Transmitting • Repeat step 1, step 2 several times. ADJUSTMENT MEASUREMENT VALUE POINT UNIT LOCATION UNIT ADJUST PA Rear panel MAIN MAIN Connect an ammeter (3 A) between power supply and the IC- 910H. Connect an RF power meter to [UHF ANT] connector. Connect an RF power meter to [VHF ANT] connector. Connect an RF voltmeter to check point J51 via the JIG cable (B). Connect a spectrum analyzer to check point J51 via the JIG cable (B). At the point where the TX current increases 0.5 A. At the point where the TX current increases 1.0 A as step 1. At the point where the TX current increases 0.5 A as step 2. At the point where the TX current increases 1.0 A. Maximum output power Maximum output power Maximum level Minimum carrier level PA PA PA MAIN MAIN R131 R135 (R138) R650 R150 L1, L2 C154 Refer page 5-16 software adjustment 6. C659 L2, L3 R206, R215 5 - 8
• PA UNIT P501 RF peak pre-setting for 144 M R503 PA unit pre-setting C659 RF peak adjustment for 430M Idling current adjustment for 144M R138 R131 R135 R650 C154 L1 L2 R3 PA unit pre-setting P1 RF peak pre-setting for 430M R150 Idling current adjustment for 430M RF peak adjustment for 430M • MAIN UNIT R206 R215 Carrier suppression adjustment L2 L3 IF peak adjustment 5 - 9
Page 1 and 2: SERVICE MANUAL VHF/UHF ALL MODE TRA
Page 3 and 4: TABLE OF CONTENTS SECTION 1 SPECIFI
Page 5 and 6: ■ RECEIVER • Receive system : V
Page 7 and 8: • PA UNIT TX/RX switching relay (
Page 9 and 10: SECTION 3 DISASSEMBLY AND OPTION IN
Page 11 and 12: • UT-102 VOICE SYNTHESIZER UNIT q
Page 13 and 14: SECTION 4 CIRCUIT DESCRIPTION 4-1 R
Page 15 and 16: 4-1-11 NOISE BLANKER CIRCUIT (MAIN
Page 17 and 18: low-pass filter and UHF signal are
Page 19 and 20: SECTION 5 ADJUSTMENT PROCEDURES 4-1
Page 21 and 22: • PLL AND MAIN UNITS R570 30.2 MH
Page 23 and 24: • PA UNIT 144M receiver peak/gain
Page 25: • PA UNIT 430M peak adjustment fo
Page 29 and 30: • MAIN UNIT R202 Drive level adju
Page 31 and 32: SOFTWARE ADJUSTMENT (continued) ADJ
Page 37 and 38: CP321 Idling check point CP322 Idli
Page 39 and 40: R67 APC adjustment CP401 APC check
Page 41 and 42: [DISPLAY BOARD] REF ORDER NO. NO. D
Page 43 and 44: [RIT BOARD] REF ORDER NO. NO. R2 72
Page 45 and 46: [PLL UNIT] REF ORDER NO. NO. DESCRI
Page 47 and 48: [PLL UNIT] REF ORDER NO. NO. DESCRI
Page 49 and 50: [MAIN UNIT] REF NO. ORDER NO. DESCR
Page 53 and 54: [MAIN UNIT] REF ORDER NO. NO. DESCR
Page 57 and 58: [PA UNIT] REF NO. ORDER NO. DESCRIP
Page 59 and 60: [PA UNIT] REF ORDER NO. NO. DESCRIP
Page 65 and 66: [MAIN UNIT] — UX-910 REF NO. ORDE
Page 67 and 68: [MAIN UNIT] — UX-910 REF ORDER NO
Page 69 and 70: [MAIN UNIT] — UX-910 REF ORDER NO
Page 71 and 72: [PA UNIT] REF. NO. ORDER NO. DESCRI
Page 73 and 74: 2SK2855 2SK2973 2SK2975 3SK131 T2 L
Page 75 and 76: SECTION 9 9-1 VR-A BOARD • TOP VI
Page 77 and 78:
1-1-32, Kamiminami, Hirano-ku, Osak
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IC-910H Service manual - n7tgb

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