Icom IC R8500 Service Manual Addendum page 111

Apr. 2010
RECEIVER ADJUSTMENT (continued)
ADJUSTMENT ADJUSTMENT CONDITIONS
HF TOTAL 1 • Frequency
GAIN • Mode
• Connect an SSG to the anntena connector
for 0.1–30 MHz (50 Ω ANT) and set as;
Frequency
Level*
Modulation
• Receiving
2 • Set the SSG as;
Level
VHF/UHF 1 • Frequency
TOTAL GAIN • Mode
• Connect an SSG to the antenna connector
for 30–2000 MHz and set as;
Frequency
Level*
Modulation
• Receiving
2 • Set the SSG as;
Level
NOISE 1 • Frequency
BLANKER • Mode
• Connect an SSG to the antenna connector
for 30–2000 MHz and set as;
Level*
and apply the following signal to the anntena
connector.
• Mode
• Receiving
CENTER 1 • Frequency
STOP • Mode
• Tunig step
• Connect an SSG to the antenna connector
for 30–2000 MHz and set as;
Frequency
Level*
Modulation
• Receiving
AM CENTER 1 • Frequency
• Mode
• Connect an SSG to the antenna connector
for 30–2000 MHz and set as;
Frequency
Level*
Modulation
• Receiving
*; This output level of the SSG is indicated as SSG's terminated circuit.
(Replacement page)
: 14.09850 MHz
: USB
: 14.10000 MHz
: 1 mV (–47 dBm)
: OFF
: OFF
: 173.0185 MHz
: USB
: 173.02000 MHz
: 1 mV (–47 dBm)
: OFF
: OFF
: 173.00000 MHz
: USB
: 5.6 µV (–92 dBm)
100 msec.
1 msec.
: ON
: 173.02000 MHz
: FM
: 100 Hz
: 173.02000 MHz
: 32 µV (–77 dBm)
: OFF
: 173.01870 MHz and
173.01890 MHz
: AM
: 173.02000 MHz
: 32 µV (–77 dBm)
: OFF
MEASUREMENT
UNIT LOCATION
Rear C o n n e c t a n
panel millivoltmeter to the [EXP
SP] jack with an 8 Ω load.
Rear C o n n e c t a n
panel millivoltmeter to the [EXT
SP] with an 8 Ω load.
Rear Connect an oscilloscope to
the [EXT SP] with an 8 Ω
panel
load.
MAIN-A Connect an oscilloscope to
CP3.
MAIN-A Connect an oscilloscope to
CP3.
5 - 5
ADJUSTMENT
VALUE
UNIT
A C 1.5 kHz audio signal Front
panel
1.0 V (0 dB)
100 mV (–20 dB) MAIN-A
A C 1.5 kHz audio signal Front
panel
1.0 V (0 dB)
100 mV (–20dB) MAIN-A
M i n i m u m n o i s e MAIN-A
level
At the point where MAIN-A
the voltage just
b e c o m e s 0 V
fo r e q u i d i s t a n t
v a l u e s b o t h
above and below
t h e d i s p l a y e d
freqency.
At the point where MAIN-A
the voltage just
becomes 0 V at
173.01870 MHz
a n d 5 V a t
173.01890 MHz.
POINT
ADJUST
[DIAL]
[AF GAIN]
R139
[DIAL]
[AF GAIN]
R504
L18, L21
R233
R447