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

SECTION 5

5-1 PREPARATION

When adjusting IC-4088E, HM-75A
All adjustment items must be preformed at "ADJUSTMENT MODE" as show below.
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 THE ADJUSTMENT MODE
¡ ¡ Turn the transceiver's power OFF.
™ ™ While connecting the "TEST" on the MAIN board to "GND",
then turn power ON.
OPERATION ON THE ADJUSTMENT MODE
• Change the adjustment item
• Change the adjustment value
• Verify the adjustment value
• Change the adjustment channel
• Change the adjustment group
ADJUSTMENT ITEMS
When entering adjustment mode, displayed adjustment items indicator on LCD as follow.
• Reference frequecy adjustment
• Output power adjustment
• FM deviation adjustment
• CTCSS adjustment
• Squelch adjustment
CONNECTION
CAUTION:
DO NOT transmit while the SSG is
connected to the antenna.
Standard signal
generator
RF power meter
50 Ω / 1–500 mW
FM deviation
meter
ADJUSTMENT PROCEDURES
OPTIONAL SPEAKER-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
: HM-75A's [B] key
: HM-75A's [UP]/[DN] keys
: HM-75A's [A] key
: IC-4088E's [UP]/[DN] keys
: IC-4088E's [MODE]+ [UP]/[DN] keys
: Displayed
: Displayed
: Displayed
: Displayed
: Displayed
Frequency
counter
to RF unit J1
to DC IN
DC power supply
4.5 V /1.0 A
is required.
EQUIPMENT
FM deviation meter Frequency range
Measuring range
Standard signal
Frequency range
generator (SSG)
Output level
to MIC JACK
to SP JACK
J1
TEST
5 - 1
GRADE AND RANGE
: 30–600 MHz
: 0 to ±10 kH
: 0.1–600 MHz
: 0.1 µV–32 mV
(–127 to –17 dBm)
PTT switch A
B
OFF ON
LOCK
Lock switch:
Locks all
switches
except [PTT]
Audio generator
AC millivoltmeter
HM-75A
Earphone
jack