IC-910H Service manual - n7tgb

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5-7 UX-910 ADJUSTMENTS ADJUSTMENT 2ND LO LOCK VOLTAGE 1ST LO LOCK VOLTAGE 1 1 2 ADJUSTMENT CONDITION • Connect an optional UX-910 (1200 MHz band unit). • Display frequency: 1270.5000 MHz • Receiving • Display frequency: 1240.0000 MHz • Receiving • Display frequency: 1300.0000 MHz • Receiving ADJUSTMENT MEASUREMENT VALUE POINT UNIT LOCATION UNIT ADJUST MAIN (UX-910) MAIN (UX-910) Connect a digital multimeter or oscilloscope to check point CP701. Connect a digital multimeter or oscilloscope to check point CP501. 2.6–3.8 V 6.0–7.0 V 3.4–4.4 V Verify Verify RECEIVER GAIN ATT GAIN IDLING POWER BALLANCE TRANSMITTER GAIN 1 1 1 1 2 3 4 1 • Display frequency: 1280.0000 MHz • Connect a standard signal generator to [12 ANT] connector and set as: Frequency : 1280.0000 MHz Level Modulation: OFF • Receiving : 710 µV* (–50 dBm) • Display frequency: 1280.0000 MHz • [ATT] : ON • Set an SSG as : Frequency : 1280.0000 MHz Level : 710 µV* (–50 dBm) Modulation: OFF • Receiving • Display frequency: Any • Mode : CW • Preset R61, R67, R83 to max. clockwise, R13 to max. counter clockwise, and C332 to center. • Connect an RF power meter to [12 ANT]. • Connect an SSG to the check point CP311 and set as : Frequency : 10.8500 MHz Level : OFF • Transmitting • Display frequency: Any • Mode : CW • Connect an SSG to the check point CP311 and set as : Frequency : 10.8500 MHz • Transmitting • Display frequency: 1240.0000 MHz • Transmitting • Display frequency: 1300.0000 MHz • Transmitting • Display frequency: 1270.0000 MHz • Set an SSG as : Frequency : 10.8500 MHz Level : 18 mV* (–22 dBm) • Transmitting MAIN (UX-910) MAIN (UX-910) MAIN (UX-910) Rear panel Rear panel Connect a spectram analyzer to check point CP311. Connect a spectram analyzer to check point CP311. Connect a digital multimeter between check points CP321 and CP322. Connect an RF power meter to [12 ANT]. Repeat step 2 and step 3 several times until power difference is minimum. Connect an RF power meter to [12 ANT]. *This output level of a standard signal generator (SSG) is indicated as SSG’s open circuit. –34 dBm (16 dB gain) –14 dBm (20 dB of gain difference between the attenuator ON and OFF.) 0.5 V voltage difference 5 W Read the RF power meter indication. Same power as step 2 5 W MAIN (UX-910) MAIN (UX-910) MAIN (UX-910) MAIN (UX-910) MAIN (UX-910) R224 R288 R13 Adjust SSG’s level Verify C332 R83 5 - 18
CP321 Idling check point CP322 Idling check point R67 APC adjustment CP401 APC check point CP15 APC check point R288 Attenuator adjustment C332 Power ballance adjustment R13 Idling adjustment CP501 1st LO lock voltage check point R37 APC adjustment R61 APC adjustment R83 Transmitter gain adjustment R224 Receiver gain adjustment CP701 2nd LO lock voltage check point CP311 Receiver gain check point 5 - 19
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 and 26: • PA UNIT 430M peak adjustment fo
Page 27 and 28: • PA UNIT P501 RF peak pre-settin
Page 29 and 30: • MAIN UNIT R202 Drive level adju
Page 31 and 32: SOFTWARE ADJUSTMENT (continued) ADJ
Page 33 and 34: SOFTWARE ADJUSTMENT (continued) ADJ
Page 35: SOFTWARE ADJUSTMENT (continued) ADJ
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

IC-910H Service manual - n7tgb

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