Section 5 Adjustment Procedures; Preparation - Icom IC-R3 Service Manual

SECTION 5

5-1 PREPARATION

' ' REQUIRED TEST EQUIPMENT
EQUIPMENT
Output voltage
DC power supply
Current capacity
Digital multimeter Input impedance
Frequency range
Oscilloscope
Measuring range
Frequency range
Audio generator
Measuring range
' ' ENTERING ADJUSTMENT MODE
q Turn power OFF.
w Input the square wave (as illustration at page 5-2) to the [SP] jack (RF unit; J2).
e Push and hold the [FUNC] key, and then turn power ON.
NOTE: When turning power OFF disconnecting the square wave, cancelled the adjustment mode.
' ' OPERATING ON THE ADJUSTMENT MODE
Change the adjustment item or channel : [Ω] or [≈]
Change the value
' ' FM-TV FREQUENCY ADJUSTMENT ([OTH-2] ONLY)
When adjusting "FM-TV FREQUENCY", need to remove the FM-TV unit from the IC-R3 as follow.
q Unsoldering 3 points A and 3 points B.
w Pull up the FM-TV unit.
REMOVING FM-TV UNIT
ADJUSTMENT PROCEDURES
GRADE AND RANGE
: 4.5 V DC
: 1 A or more
: 10 MΩ/DC or better
: DC–20 MHz
: 0.01–10 V
: 1–3000 Hz
: 0.01–10 V
: [DIAL]
unsoldering here
EQUIPMENT
Frequency range
Frequency counter Frequency accuracy : ±1 ppm or better
Sensitivity
Frequency range
Standard signal
Output level
generator (SSG)
Digital DC voltmeter Input impedance
B
A
5 - 1
GRADE AND RANGE
: 0.1–2500 MHz
: 100 mV or better
: 0.1–2500 MHz
: 0.1 µV–32 mV
(–127 to –17 dBm)
: 10 MΩ/DC or better
unsoldering here