Section 5 Adjustment Procedures; Preparation - Icom IC-4088SR Service Manual

SECTION 5

5-1 PREPARATION

• When adjusting the IC-4088SR, *HM-75A
page5-2) is required.
• All adjustment items must be preformed at "ADJUSTMENT MODE". (See below in detail)
' ' REQUIRED TEST EQUIPMENT
EQUIPMENT
Output voltage
DC power supply
Current capacity
Measuring range
RF power meter Frequency range
(terminated type) Impedance
SWR
Frequency range
Frequency counter Frequency accuracy : ±1 ppm or better
Sensitivity
ENTERING THEADJUSTMENT MODE
' '
¡ ¡ Turn the transceiver's power OFF.
™ ™ While connecting the "TEST" on the MAIN unit to "GND", then turn power ON.
• DISPLAYED CHANNEL'S FREQUENCY LIST
CHANNEL NO.
1ch.
2ch.
3ch.
4ch.
5ch.
6ch.
7ch.
8ch.
ADJUSTMENT PROCEDURES
JIG MICROPHONE
GRADE AND RANGE
: 4.5 V DC
: 1 A or more
: 1 mW–1 W
: 300–600 MHz
: 50 Ω
: Less than 1.2 : 1
: 0.1–600 MHz
: 100 mV or better
FREQUENCY
446.00625 MHz
446.01875 MHz
ENTERING THE ADJUSTMENT MODE
446.03125 MHz
q Turn the transceiver power OFF.
446.04375 MHz w While connecting the "TEST" to GND,
446.05625 MHz
446.06875 MHz
446.08125 MHz
446.09375 MHz
(modified HM-75A
OPTIONAL SPEAKER-MICROPHONE;
EQUIPMENT
FM deviation meter
Standard signal
generator (SSG)
AC millivoltmeter
Audio generator
J1
RF test port
then turn power ON.
5 - 1
see illustration at
GRADE AND RANGE
Frequency range : 30–600 MHz
Measuring range : 0 to ±10 kH
Frequency range : 0.1–600 MHz
Output level : 0.1 µV–32 mV
(–127 to –17 dBm)
Measuring range : 10 mV–10 V
Frequency range : 300–3000 Hz
Output level : 1–500 mV
J1
TEST