Section 5 Adjustment Procedures; Meter Reference Adjustment - Icom IC-R8500 Service Manual

SECTION
5
ADJUSTMENT PROCEDURES
5-1
METER REFERENCE ADJUSTMENT
NOTE:
This
adjustment
1$
not necessary unless the
CPU
or
EEPROM
ICs are replaced.
The
set data
would
not
be
cleared
by
CPU
resetting.
ADJUSTMENT
ADJUSTMENT ADJUSTMENT
CONDITIONS
DOT
MATRIX DISPLAY OPERATION
ENTERING
ADJUSTMENT
SET
MODE
• Connect a
terminator to the
[REMOTE]
connector
on
the rear panel.
• While pushing
the
[M-CH] and [ENT]
dutches,
turn
power ON.
Push
0123
Push
[0] to
enter
meter
reference
set
mode; use
[M-CH] /[ENT]
switch
to
select item.
METER
INDICATION
1
• Set the
meter
indication to "S3" with
^e
(DIAL).
Push
[M-CHJ.
2 •
Set
the
meter
indication to "S5" with
the
[DIAL].
SET S5
•
Push [M-CH],
3 • Set the
meter
indication to "S7" with the
[DIAL],
SET
S7
Push
[M-CH].
1
• Set the meter
indication to
"S9"
with
the
[DIAL].
1
SET S9
Push
[M-CH].
5 Set the
meter
Indication to
"S9+20"
with
the [DIAL].
SET S9+20
Push
[M-CH].
6 Set
the
meter
indication to 'S9+40" with
the
[DIAL].
SET
S9+40
Push
(M-CHJ.
1
• Set the
meter
indication
to "S9<fS0'*
with
the [DIAL].
SET
S9+60
Push
(M-CHJ.
5-2
POWER
SUPPLY VOLTAGE
AND
PLL
ADJUSTMENT
ADJUSTMENT
ADJUSTMENT
CONDITIONS
MEASUREMENT
VALUE
ADJUSTMENT
POINT
UNIT
LOCATION
UNIT
ADJUST
POWER
SUPPLY
VOLTAGE
•
Connect an AO-55
to
the
(DC
IN].
•
Displayed
freq.
:
1100.000
MHz
•
Mode
:
Any
•
Receiving
MAIN
Connect a
voltmeter
to
Jl5pin
2.
12.5V MAIN
R280
REFERENCE
FREQUENCY
1
•
Displayed
freq.
:
Any
•
Mode
:
Any
PLL
Connect a Irequency
counter
to
P5.
15.100000
MHz
PLL The
trimmer
capacitor
of
XI
2
Connect an
RF
volt-
meter
(50
Q
im-
pedance)
to
P5.
2
dBm ±3
dB
Verify
6-1