Receiver Adjustment - Icom IC R8500 Service Manual Addendum

Jun. 2011

5-3 RECEIVER ADJUSTMENT

ADJUSTMENT ADJUSTMENT CONDITIONS
PIN ATT 1 • Frequency
• Mode
• Receiving
HF 1 • Frequency
SENSITIVITY • Mode
• [10dB]
• [AGC]
• Connect an SSG to the antenna connector
for 0.1–30 MHz (50 Ω ANT) and set as;
Frequency
Level*
Modulation
• Receiving
2 • Set the SSG as;
Level
• Receiving
1ST MIXER 1 • Frequency
BIAS VOLTAGE • Receiving
HPF SHIFT 1 • Frequency
VOLTAGE • Mode
• Receiving
2 • Frequency
• Receiving
NOTE: Before adjusting WFM SENSITIVITY, 5-4 RF-C BPF TUNED VOLTAGE must be adjusted.
SENSITIVITY 1 • Frequency
(WFM) • Mode
• Connect an SSG to the antenna connector
for 30–2000 MHz and set as;
Frequency
Level*
Modulation
Deviation
• Receiving
(FM) 2 • Frequency
• Mode
• Connect an SSG to the antenna connector
for 30–2000 MHz and set as;
Frequency
Level*
Modulation
Deviation
• Receiving
3 • Set the SSG as;
Level*
Modulation
4 • Set the SSG as;
Level
1ST IF 1 • Frequency
NOTCH • Mode
• Connect an SSG to the antenna connector
for 30–2000 MHz and set as;
Frequency
Level*
Modulation
Deviation
• Receiving
*; This output level of the SSG is indicated as SSG's terminated circuit.
(Replacement page)
UNIT
: 14.10000 MHz RF-C
: USB
: 14.09850 MHz Rear
: USB panel
: ON
: Fast
: 14.10000 MHz
: 0.56 µV (–112 dBm)
: OFF
: OFF
: 173.00000 MHz RF-D
: 1300.00000 MHz CONV-B Connect a digital
: FM
: 1100.00000 MHz
: 173.02000 MHz MAIN-A
: WFM
: 173.02000 MHz
: 3.2 µV (–97 dBm)
: 1 kHz
: ±75 kHz
: 173.02000 MHz Front
: FM panel
: 173.02000 MHz
: 3.2 µV (–97 dBm)
: 1 kHz
: ±5 kHz
MAIN-A
: 32 µV (–77 dBm)
: None
Front
: OFF panel
: 788.60000 MHz Front
: FM panel
: 810.00000 MHz
: 32 mV (–17 dBm)
: 1 kHz
: ±75 kHz
5 - 3
MEASUREMENT
LOCATION
Connect a digital
multimeter to CP1.
C o n n e c t a n A C Maximum output
voltmeter to the [EXT
SP] with an 8 Ω load.
Minimum output
Connect a digital 2.9–3.1 V
multimeter to CP1.
multimeter to CP2.
2.0–4.0 V
Connect a digital Minimum
multimeter to CP4.
(Note the voltage
as the reference)
S-meter Maximum
Connect a digital The same voltage
multimeter to CP5. on "SENSITIVITY
(WFM)."
The center
indicator
disappears.
Center indicator
S-meter Maximum
ADJUSTMENT
POINT
VALUE
UNIT ADJUST
1.7 V RF-C R63
Adjust in
level sequence
L65, L66,
L63, L62
(repeatedly)
R77
level
RF-D R109
14.5 V CONV-B R55
Verify
MAIN-A Adjust in
level sequence
L7, L8, L9,
L10
(repeatedly)
MAIN-A Adjust in
level sequence
L14, L17,
L22, L25,
L26
(repeatedly)
MAIN-A R60
AFC
RECV
MIX-A L15
level