Icom Ic-910h Vhf/Uhf All Mode Tranciever Service Manual
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Page 21
5 - 3 X512 Reference frequency adjustment C402 430M lock voltage adjustment P251 144M LO level check point L193 144M lock voltage adjustment J541 30.2 MHz level check point CP300 430M lock voltage check point P421 430M LO level check point L551J51 CP51 FM TX-LO frequency check point J52 FM TX-LO frequency pre-setting CP100 144M lock voltage check point P551 Reference frequency check point L255 FM TX-LO frequency adjustment P701 Sub BFO level check point L552 Referemce level adjustment P601 Main...
Page 22
*This output level of a standard signal generator (SSG) is indicated as SSG’s open circuit. 5 - 4 5-4 RECEIVER ADJUSTMENTS Receiver adjustments must be performed after software adjustment (0) and (1). SUB band must be OFF when adjusting MAIN band, or main AF volume (max.counter clockwise) and SQL volume (max. clockwise) must be set when adjusting SUB band. 144 M RECEIVER PEAK/GAIN 144 M PEAK (MAIN BAND) 144 M TOTAL GAIN (MAIN BAND) 144 M PEAK (SUB BAND) 144 M TOTAL GAIN (SUB BAND) ADJUSTMENT ADJUSTMENT...
Page 23
5 - 5 L521 144M receiver peak/gain adjustment P501 144M receiver peak/gain check point R547 L52 L51 144M peak adjustment for main bandL53 • PA UNIT • MAIN UNIT L353 L352L851 R857 144M peak adjustment for sub band 144M total gain adjustment for sub band J51 144M receiver peak/gain pre-setting L852 L853 L651 L652 L653 144M peak adjustment for main band L354 R360 144M total gain adjustment for main band
Page 24
![Page 24
*This output level of a standard signal generator (SSG) is indicated as SSG’s open circuit.
RECEIVER ADJUSTMENTS (continued)
430 M PEAK
(MAIN BAND)
430 M PEAK
(SUB BAND)
430 M
TOTAL GAIN
(MAIN BAND)
NOISE
BLANKER
(MAIN BAND)
(SUB BAND)1
1
1
2
1
2
3
4• Display frequency: 435.0200 MHz
• Mode : FM
• Connect a standard signal generator
to [UHF ANT] connector and set as:
Frequency : 435.0200 MHz
Level : 1 µV* (–107 dBm)
Modulation :
1 kHz/±5.0 kHz Dev.
• Receiving
• Sub display freq. : 435.0200 MHz
• Mode...](http://img.usermanuals.tech/thumb/2452/82257/w300_icom_ic910-vhf-uhf-tranciever_service-manual_d-23.png "Page 24
*This output level of a standard signal generator (SSG) is indicated as SSG’s open circuit.
RECEIVER ADJUSTMENTS (continued)
430 M PEAK
(MAIN BAND)
430 M PEAK
(SUB BAND)
430 M
TOTAL GAIN
(MAIN BAND)
NOISE
BLANKER
(MAIN BAND)
(SUB BAND)1
1
1
2
1
2
3
4• Display frequency: 435.0200 MHz
• Mode : FM
• Connect a standard signal generator
to [UHF ANT] connector and set as:
Frequency : 435.0200 MHz
Level : 1 µV* (–107 dBm)
Modulation :
1 kHz/±5.0 kHz Dev.
• Receiving
• Sub display freq. : 435.0200 MHz
• Mode...")
*This output level of a standard signal generator (SSG) is indicated as SSG’s open circuit. RECEIVER ADJUSTMENTS (continued) 430 M PEAK (MAIN BAND) 430 M PEAK (SUB BAND) 430 M TOTAL GAIN (MAIN BAND) NOISE BLANKER (MAIN BAND) (SUB BAND)1 1 1 2 1 2 3 4• Display frequency: 435.0200 MHz • Mode : FM • Connect a standard signal generator to [UHF ANT] connector and set as: Frequency : 435.0200 MHz Level : 1 µV* (–107 dBm) Modulation : 1 kHz/±5.0 kHz Dev. • Receiving • Sub display freq. : 435.0200 MHz • Mode...
Page 25
5 - 7 L283 L22 L23 430M peak adjustment for main bandL282 • PA UNIT • MAIN UNIT R61 430M total gain adjustment for main band CP701 Noise blanker check point for sub band Noise blanker adjustment for sub band L704 L703 430M peak adjustment for sub band L280 L281 CP851 430M peak check point for main band L102Noise blanker adjustment for main band CP101 Noise blanker check point for main band CP852 430M peak check point for sub band L103
Page 26
![Page 26
PA UNIT
PRESETTING
IDLING
CURRENT
(for 144 M)
(for 430 M)
RF PEAK
(for 430 M)
(for 144 M)
IF PEAK
CARRIER
SUPPRESSION
• 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.
5 - 8
5-5 TRANSMITTER ADJUSTMENTS
ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITIONMEASUREMENT
VALUEPOINT
UNIT LOCATION UNIT ADJUST
1
1
2
3
4
1
2
3
4
1
1
2
3• Display frequency:
[EUR], [KOR] 145.0000...](http://img.usermanuals.tech/thumb/2452/82257/w300_icom_ic910-vhf-uhf-tranciever_service-manual_d-25.png "Page 26
PA UNIT
PRESETTING
IDLING
CURRENT
(for 144 M)
(for 430 M)
RF PEAK
(for 430 M)
(for 144 M)
IF PEAK
CARRIER
SUPPRESSION
• 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.
5 - 8
5-5 TRANSMITTER ADJUSTMENTS
ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITIONMEASUREMENT
VALUEPOINT
UNIT LOCATION UNIT ADJUST
1
1
2
3
4
1
2
3
4
1
1
2
3• Display frequency:
[EUR], [KOR] 145.0000...")
PA UNIT PRESETTING IDLING CURRENT (for 144 M) (for 430 M) RF PEAK (for 430 M) (for 144 M) IF PEAK CARRIER SUPPRESSION • 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. 5 - 8 5-5 TRANSMITTER ADJUSTMENTS ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITIONMEASUREMENT VALUEPOINT UNIT LOCATION UNIT ADJUST 1 1 2 3 4 1 2 3 4 1 1 2 3• Display frequency: [EUR], [KOR] 145.0000...
Page 27
5 - 9 Idling current adjustment for 144M R135 R131 R138 • PA UNIT • MAIN UNIT R3 PA unit pre-setting P1 RF peak pre-setting for 430M R150 Idling current adjustment for 430M IF peak adjustment L3 L2 Carrier suppression adjustment R215 R206 C154 RF peak adjustment for 430M L2 L1C659 RF peak adjustment for 430M R503 PA unit pre-setting P501 RF peak pre-setting for 144 M R650
Page 28
![Page 28
5 - 10
IF TOTAL
GAIN
TOTAL GAIN
(for 144 M)
(for 430 M)
Ic APC
DRIVE LEVEL
LO LEAK
(for 144 M)
TRANSMITTER ADJUSTMENTS (continued)
ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITIONMEASUREMENT
VALUEPOINT
UNIT LOCATION UNIT ADJUST
1
1
2
3
1
2
1• Display frequency: Any
• Mode : USB
• MIC gain : Center
• Disconnect P501 (PA unit) from J51
on the MAIN unit.
• Connect an audio generator to
[MIC] connector and set as:
Frequency : 1.5 kHz
Level : 2 mVrms
• Transmitting
• Display frequency:
[EUR], [KOR] 145.0000 MHz...](http://img.usermanuals.tech/thumb/2452/82257/w300_icom_ic910-vhf-uhf-tranciever_service-manual_d-27.png "Page 28
5 - 10
IF TOTAL
GAIN
TOTAL GAIN
(for 144 M)
(for 430 M)
Ic APC
DRIVE LEVEL
LO LEAK
(for 144 M)
TRANSMITTER ADJUSTMENTS (continued)
ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITIONMEASUREMENT
VALUEPOINT
UNIT LOCATION UNIT ADJUST
1
1
2
3
1
2
1• Display frequency: Any
• Mode : USB
• MIC gain : Center
• Disconnect P501 (PA unit) from J51
on the MAIN unit.
• Connect an audio generator to
[MIC] connector and set as:
Frequency : 1.5 kHz
Level : 2 mVrms
• Transmitting
• Display frequency:
[EUR], [KOR] 145.0000 MHz...")
5 - 10 IF TOTAL GAIN TOTAL GAIN (for 144 M) (for 430 M) Ic APC DRIVE LEVEL LO LEAK (for 144 M) TRANSMITTER ADJUSTMENTS (continued) ADJUSTMENT ADJUSTMENT ADJUSTMENT CONDITIONMEASUREMENT VALUEPOINT UNIT LOCATION UNIT ADJUST 1 1 2 3 1 2 1• Display frequency: Any • Mode : USB • MIC gain : Center • Disconnect P501 (PA unit) from J51 on the MAIN unit. • Connect an audio generator to [MIC] connector and set as: Frequency : 1.5 kHz Level : 2 mVrms • Transmitting • Display frequency: [EUR], [KOR] 145.0000 MHz...
Page 29
5 - 11 • PA UNIT • MAIN UNIT R3 Total gain adjustment for 430M IF total gain adjustment R3 IC APC adjustment IC APC pre-setting R1613 CP1613 Drive level adjustment R202 IF total gain /Drive level check point J51 R503 Total gain adjustment for 144M R504 LO leak adjustment for 144M P501 IF total gain /Drive level pre-setting
Page 30
![Page 30
*This output level of a standard signal generator (SSG) is indicated as SSG’s open circuit.
5 - 12
5-6 SOFTWARE ADJUSTMENT
ENTERING
SOFTWARE
ADJUSTMENT
ADJUSTMENT
ITEM (0)
VOLUME
CENTER
PLL UNLOCK
ADJUSTMENT
ITEM (1)
TUNED BPF
(for 144 M)
(for 430 M)
ADJUSTMENT ADJUSTMENT CONDITION DISPLAY OPERATION
• Enter software adjustment mode:
1Turn power OFF.
2Terminate the [REMOTE] jack with a
3.5(d) mm mini-plug.
3While pushing [RIT] and [SATELLITE]
keys, turn power ON.
• Push [0] to enter the volume center...](http://img.usermanuals.tech/thumb/2452/82257/w300_icom_ic910-vhf-uhf-tranciever_service-manual_d-29.png "Page 30
*This output level of a standard signal generator (SSG) is indicated as SSG’s open circuit.
5 - 12
5-6 SOFTWARE ADJUSTMENT
ENTERING
SOFTWARE
ADJUSTMENT
ADJUSTMENT
ITEM (0)
VOLUME
CENTER
PLL UNLOCK
ADJUSTMENT
ITEM (1)
TUNED BPF
(for 144 M)
(for 430 M)
ADJUSTMENT ADJUSTMENT CONDITION DISPLAY OPERATION
• Enter software adjustment mode:
1Turn power OFF.
2Terminate the [REMOTE] jack with a
3.5(d) mm mini-plug.
3While pushing [RIT] and [SATELLITE]
keys, turn power ON.
• Push [0] to enter the volume center...")
*This output level of a standard signal generator (SSG) is indicated as SSG’s open circuit. 5 - 12 5-6 SOFTWARE ADJUSTMENT ENTERING SOFTWARE ADJUSTMENT ADJUSTMENT ITEM (0) VOLUME CENTER PLL UNLOCK ADJUSTMENT ITEM (1) TUNED BPF (for 144 M) (for 430 M) ADJUSTMENT ADJUSTMENT CONDITION DISPLAY OPERATION • Enter software adjustment mode: 1Turn power OFF. 2Terminate the [REMOTE] jack with a 3.5(d) mm mini-plug. 3While pushing [RIT] and [SATELLITE] keys, turn power ON. • Push [0] to enter the volume center...