IC-910H Service manual - n7tgb

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5-2 PLL ADJUSTMENTS ADJUSTMENT 30.2 MHz LEVEL REFERENCE FREQUENCY 144M LOCK VOLTAGE 440M LOCK VOLTAGE MAIN BFO LEVEL SUB BFO LEVEL 1 1 2 1 2 3 1 2 3 1 2 ADJUSTMENT CONDITION • Display frequency: Any • Receiving • Display frequency: Any • Receiving This adjustment must be performed at 5 minutes later after power ON. • Display frequency: 173.9800 MHz • Mode : USB • Receiving • Display frequency: 136.0200 MHz • Receiving • Display frequency: 155.0000 MHz • Receiving • Display frequency: 479.9800 MHz • Mode : USB • Receiving • Display frequency: 420.0200 MHz • Receiving • Display frequency: 450.0000 MHz • Receiving • Display frequency: Any • Mode :USB • Receiving • Sub display freq. : Any • Mode :USB • Receiving ADJUSTMENT MEASUREMENT VALUE POINT UNIT LOCATION UNIT ADJUST PLL PLL PLL PLL PLL PLL Connect an RF voltmeter or spectram analyzer to check point J541. Connect an RF voltmeter or spectram analyzer to check point P551. Connect a frequency counter to check point P551. Connect a digital multimeter or oscilloscope to check point CP100. Connect an RF voltmeter to check point P251. Connect a digital multimeter or oscilloscope to check point CP300. Connect an RF voltmeter to check point P421. Connect an RF voltmeter to check point P601. Connect an RF voltmeter to check point P701. –10 dBm (or more than –11.5 dBm, when R570 is in maximum position.) Maximum level (–13 dBm to –7dBm) 60.400000 MHz 2.7 V 0.6 V to 1.6 V –10 dBm to –4 dBm 3.4 V 0.5 V to 1.5 V –16 dBm to –10 dBm –11 dBm to –5 dBm –11 dBm to –5 dBm PLL PLL PLL PLL PLL PLL R570 Adjust in sequence L551, L552 several times. The trimmer capacitor of X512. L193 Verify Verify C402 Verify Verify Verify Verify 5-3 FREQUENCY ADJUSTMENT ADJUSTMENT FM TX-LO FREQUENCY ADJUSTMENT CONDITION 1 • Display frequency: Any • Mode : FM • Disconnect P501, P502 (PA unit) from J51 and J52 on the MAIN unit. • Apply no audio signals to [M<strong>IC</strong>] connector. • Transmitting ADJUSTMENT MEASUREMENT VALUE POINT UNIT LOCATION UNIT ADJUST MAIN Connect a frequency counter to check point CP51. After adjustment, connect P501, P502 (PA unit) to J51, J52 on the MAIN. 10.85000 MHz MAIN L255 5 - 2
• PLL AND MAIN UNITS R570 30.2 MHz level adjustment L193 144M lock voltage adjustment P251 144M LO level check point X512 Reference frequency adjustment J541 30.2 MHz level check point C402 430M lock voltage adjustment CP300 430M lock voltage check point P421 430M LO level check point Referemce level adjustment L551 L552 P701 Sub BFO level check point CP100 144M lock voltage check point P551 Reference frequency check point L255 FM TX-LO frequency adjustment J51 FM TX-LO J52 frequency pre-setting CP51 FM TX-LO frequency check point P601 Main BFO level check point 5 - 3
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: SECTION 5 ADJUSTMENT PROCEDURES 4-1
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 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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