Adjustment Procedures; Preparation - Icom IC-7600 Service Manual

SECTION 4.

4-1 PREPARATION

¤ REQUIRED EQUIPMENTS
EQUIPMENT
Modifi ed 3.5 mm (1/8'') monoral plug
Short plug
(See the illust on the page 4-17)
RF voltmeter Measuring range
(50 Ω terminated)
Frequency range
Measuring range
RF power meter
Frequency range
(50 Ω terminated)
SWR
Frequency range
Frequency counter Frequency accuracy : ±1 ppm or better
Input level
Frequency range
Standard signal
Output level
generator (SSG)
CAUTION!:
SAVE the originally programmed contents (Memory channel contents, set mode settings, etc.) into the USB-Memory
before starting adjustment. When all adjustments are completed, these contents in the transceiver will be cleared.
¤ REMOVING COVERS
Some adjustments require removal the covers to expose PCB.
CAUTION: Turn the power OFF and disconnect the
DC power cable from the transceiver before per-
forming any work on the transceiver. Otherwise,
there is danger of electric shock and/or equipment
damage.
q Remove the two screws from the carrying handle
and remove the handle from the transceiver.
w Remove the 6 screws from the top of the trans-
ceiver and the 4 screws from the sides, then lift up
the top cover.
e Turn the transceiver upside-down.
CAUTION: NEVER HOLD THE MAIN DIAL OR
ANY OTHER KNOBS when the transceiver is
being turned upside down. This may damage the
transceiver.
r Remove 6 screws from the bottom, then lift up the
bottom cover.
t Remove the 11 screws, and disconnect the speaker
cable, then remove the top shielding plate. <fig.1>
y Remove the 6 screws, then remove the bottom
shielding plate. <fig.2>
Top shielding plate
ADJUSTMENT PROCEDURE
GRADE AND RANGE
: 20–200 mV
: 0.1–50 MHz
: 5–120 W
: 0.1–50 MHz
: Less than 1.2 : 1
: 0.1–100 MHz
: Less than 1 mW
: 0.1–100 MHz
: 0.1 mV to 32 mV
(–127 to –17 dBm)
Bottom shielding plate
Speaker cable
<fig.1>
EQUIPMENT
Audio generator Frequency range
(AG) Output level
AC Millivoltmeter Measuring range
Measuring range
Digital multimeter
Input impedance
Input impedance
External speaker
Capacity
Frequency range
Spectrum Analyzer
Bandwidth
Impedance
Dummy Loads
Carrying handle
4 - 1
GRADE AND RANGE
: 300–3000 Hz
: 1–500 mV
: 10 mV to 10 V
: 0–10 V (Voltage)
1–30 A (Current)
: More than 50 kΩ
: 8 Ω
: More than 2 W
: At least 90 MHz
: 100 kHz
: 50 Ω/120 W
and
100 Ω/120 W
Top cover
PA shielding
plate
Bottom cover
<fig.2>