Adjustment Procedures; Preparation Before Servicing; Required Test Equipment; Connections - Icom IC-821H Service Manual

SECTION 5 ADJUSTMENT PROCEDURES
5-1 PREPARATION BEFORE SERVICING
• REQUIRED TEST EQUIPMENT
EQUIPMENT GRADE AND RANGE
DC power supply Output voltage : 13.8 V DC
Current capacity : 25 A or more
RF power meter Measuring range : 1-60 W
(terminated type) Frequency range : 120-460 MHz
Impedance : 50Q
SWR
: Less than 1.2 : 1
Frequency Frequency range : 0.1-460 MHz
counter Frequency accuracy:
±
1 ppm or better
Sensitivity : 100 mV or better
FM deviation Frequency range : 120-460 MHz
meter Measuring range : 0 to +5 kHz
Audio generator Frequency range : 300-3000 Hz
Output level : 1-500 mV
Spectrum Frequency range : At least 1300 MHz
analyzer Spectrum bandwidth:
±
100 MHz or wider
Attenuator Power attenuation : 50 or 60 dB
Capacity : 60 W or more
• CONNECTIONS
FM deviation
meter
Speaker
Attenuator
50 or 60 dB
AC to [EXT SP]
millivoltmeter
CW keyer
to [KEY]
DC power supply to [DC 13.8 V]
13.8 V / 25 A
• Microphone connector
Audio
generator
Pin 1 Pin 7
MI,
INPCj)Cp:f::
Pin 5
PTT
EQUIPMENT
Sweep generator
Standard signal
generator (SSG)
Digital multi meter
DC voltmeter
Oscilloscope
AC millivoltmeter
Ammeter
RF voltmeter
External speaker
to [ANT]
GRADE AND RANGE
Frequency range : 120-460 MHz
Sweep bandwidth : At least 50 MHz
Output impedance :50Q
Frequency range : 120-460 MHz
Output level
: 0.1 I1V-32 mV
(-127 to -17 dBm)
Input impedance
: 10M Q/DC or better
Input impedance : 50 kQN DC or better
Frequency range
: DC-20 MHz
Measuring range
: 0.01-10 V
Measuring range
: 10 mV 10 V
Measuring capacity : 25 A
Frequency range
Measuring range
Impedance
Max. input power
Attenuator
50 or 60 dB
: 0.1-460 MHz
: 0.01-10 V
:8Q
:5W
Spectrum
analyzer
_------l
RF power meter
60 W /50Q
VHF
_----I
Standard signal
generator
UHF
CAUTION:
DO NOT transmit while
a SSG is connected .
CAUTION:
When the [PREAMP] switch is
turned ON, DC voltages are
applied to the antenna connector.
This may damage the signal
genarator.
rTERMiNATOR-for
~et~r~~uel~h-l
, and meter reference adjustment.
i
t:J
II
POl
2-conductor
3.5 (d)
mm
(1/8")
!
~~~~~~~ ~nd ~ute~ PIU~':'
___
J
5 -1