Frequency Adjustment; Transmit Adjustment - Icom ID-31A Service Manual

5-2 FREQUENCY ADJUSTMENT

Select an adjustment item using
ADJUSTMENT
ADJUSTMENT
REFERENCE
FREQUENCY

5-3 TRANSMIT ADJUSTMENT

• IDLING CURRENT ADJUSTMENT (at 5.5 V)
Select an adjustment item using
ADJUSTMENT
ADJUSTMENT
DRIVE AMP
IDLING CURRENT
FINAL AMP
IDLING CURRENT
• IDLING CURRENT ADJUSTMENT (at 7.4 V)
Select an adjustment item using
ADJUSTMENT
ADJUSTMENT
DRIVE AMP
IDLING CURRENT
(Hi power)
(Mid power)
(Low power)
(S-Low power)
FINAL AMP
IDLING CURRENT
(Hi power)
(Mid power)
(Low power)
(S-Low power)
NOTE: When "IDLING CURRENT" is adjusted, "TRANSMIT POWER" must be alos re-adjusted.
/
, and then set the adjustment value as specifi ed using [DIAL].
ITEM
1 1) Set the power supply voltage to 7.4 V.
2) Connect a power meter or dummy load to the antenna connec-
tor.
[REF]
3) Loosely couple a frequency counter to the antenna connector.
4) While transmitting, adjust the frequency using [DIAL], and then
push [ENT] to store the adjustment value.
/
, and then set the adjustment value as specifi ed using [DIAL].
ITEM
1 1) Set the power supply voltage to 5.5 V.
2) Connect an RF power meter to the antenna connector.
3) Connect a ammeter between the power supply and transceiver.
[ID5]
4) Set the item [IP5] to "00."
2 • While transmitting, adjust the idling current using [DIAL], and then
push [ENT] to store the adjustment value.
1 1) Set the power supply voltage to 5.5 V.
2) Connect an RF power meter to the antenna connector.
3) Connect a ammeter between the power supply and transceiver.
[IP5]
2 • While transmitting, adjust the idling current using [DIAL], and then
push [ENT] to store the adjustment value.
/
, and then set the adjustment value as specifi ed using [DIAL].
ITEM
1 1) Set the power supply voltage to 7.4 V.
2) Connect an RF power meter to the antenna connector.
3) Connect a ammeter between the power supply and transceiver.
4) Set the item [IP7] to "00."
2 • While transmitting, adjust the idling current using [DIAL], and then
[ID7]
push [ENT] to store the adjustment value.
3
4
5
1 1) Set the power supply voltage to 7.4 V.
2) Connect an RF power meter to the antenna connector.
3) Connect a ammeter between the power supply and transceiver.
2 • While transmitting, adjust the idling current using [DIAL], and then
[IP7]
push [ENT] to store the adjustment value.
3
4
5
OPERATION
OPERATION
OPERATION
5 - 3
VALUE
Displayed
frequecny
(±200 Hz)
VALUE
–
120–140 mA
–
180–280 mA
VALUE
–
170–190 mA
120–140 mA
100–120 mA
–
880–980 mA
480–580 mA
160–260 mA