Icom IC-T90A manual Adjustment Procedures, Preparation, ‘ Required Test Equipment

SECTION 5 ADJUSTMENT PROCEDURES

5-1 PREPARATION

Some adjustments must be adjusted on the adjustment mode. When entering the adjustment mode, the 68 kΩ terminator (shown at page 5-2) is required.

‘REQUIRED TEST EQUIPMENT

EQUIPMENT	GRADE AND RANGE		EQUIPMENT	GRADE AND RANGE
DC power supply	Output voltage	: 11 V DC	Ammeter	Measuring capacity	: 10 A and 30 A
	Current capacity	: 3 A or more
			DC voltmeter	Input impedance	: 50 kΩ /V DC or better
	Measuring range	: 1–10 W
				Frequency range	: 300–3000 Hz
RF power meter	Frequency range	: 28–600 MHz	Audio generator
				Measuring range	: 1–500 mV
(terminated type)	Impedance	: 50 Ω
	SWR	: Less than 1.2 : 1	Standard signal	Frequency range	: 1–1300 MHz
				Output level	: 0.1 µV–32 mV
	Frequency range	: 0.1–600 MHz
			generator (SSG)
					(–127 to –17 dBm)
Frequency counter	Frequency accuracy : ±1 ppm or better
	Sensitivity	: 100 mV or better	Oscilloscope	Frequency range	: DC–20 MHz
				Measuring range	: 0.01–20 V
FM deviation meter	Frequency range	: 30–600 MHz
	Measuring range	: 0 to ±10 kHz	Attenuator	Power attenuation	: 40 or 50 dB

‘ENTERING THE ADJUSTMENT MODE q Connect a 68 kΩ terminator to the [SP] jack.

w Push and hold the [SQL] and [8] keys, and then turn power ON.

■OPERATION ON THE ADJUSTMENT MODE

Change the adjustment value	: [DIAL]
Change the adjustment channel or item [UP]	: [VFO] key
Change the adjustment channel or item [DOWN]	: [MR] key
Verify the setting condition	: [8] key

■OPERATION ON THE “OUTPUT POWER” ADJUSTMENT

When adjusting the “OUTPUT POWER” adjustment, need to change the adjustment channel indicator manually.

When displayed channel indicator “DH” on the LCD at first, push the “0” or “.” keys to change the channel indicator as follow.

Pushing key	LCD (Before)	LCD (After)
“0” key	DH	PH
“0” key	PH	DH
Pushing key	LCD (Before)	LCD (After)
“.” key	DH	DL
“.” key	DL	DE
“.” key	DE	DH

5 - 1