Icom ID-51A Service Manual - Page 22

TRANSMIT ADJUSTMENT Continued

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5-3 TRANSMIT ADJUSTMENT (Continued) • IDLING CURRENT ADJUSTMENT (at 7.4 V) Select an adjustment item using / , and then set the adjustment value as specified using [DIAL]. ADJUSTMENT ADJUSTMENT ITEM OPERATION DRIVE AMP IDLING CURRENT (At 7.4 V) VHF (Hi power) 1 1) Set the power supply voltage to 7.4 V. 2) Connect an RF power meter to the antenna connector. 3) Connect an 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 push to store the adjustment value. (Mid power) 3 VALUE - 190-210 mA 140-160 mA (Low2 power) 4 (Low1 power) (S-Low power) [ID7] 5 6 120-140 mA UHF 7 (Hi power) (Mid power) 8 230-250 mA 130-150 mA (Low2 power) 9 (Low1 power) 10 110-130 mA (S-Low power) 11 FINAL AMP IDLING CURRENT (At 7.4 V) 1 1) Set the power supply voltage to 7.4 V. 2) Connect an RF power meter to the antenna connector. 3) Connect an ammeter between the power supply and transceiver. VHF (Hi power) 2 • While transmitting, adjust the idling current using [DIAL], and then push to store the adjustment value. (Mid power) 3 (Low2 power) 4 (Low1 power) (S-Low power) [IP7] 5 6 UHF 7 (Hi power) (Mid power) 8 (Low2 power) 9 (Low1 power) 10 (S-Low power) 11 NOTE: When "IDLING CURRENT" is adjusted, "TRANSMIT POWER" must be alos re-adjusted. - 800-900 mA 450-550 mA 150-250 mA 790-890 mA 440-540 mA 140-240 mA 5 - 4

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5 - 4
5-3 TRANSMIT ADJUSTMENT (Continued)
• IDLING CURRENT ADJUSTMENT (at 7.4 V)
Select an adjustment item using
/
, and then set the adjustment value as specified using
[DIAL]
.
ADJUSTMENT
ADJUSTMENT
ITEM
OPERATION
VALUE
DRIVE AMP
IDLING CURRENT
(At 7.4 V)
[ID7]
1
1) Set the power supply voltage to 7.4 V.
2)
Connect an RF power meter to the antenna connector.
3)
Connect an ammeter between the power supply and transceiver.
4) Set the item
[IP7]
to "00."
–
VHF
(Hi power)
2
•
While transmitting, adjust the idling current using
[DIAL]
, and then
push
to store the adjustment value.
190–210 mA
(Mid power)
3
140–160 mA
(Low2 power)
4
120–140 mA
(Low1 power)
5
(S-Low power)
6
UHF
(Hi power)
7
230–250 mA
(Mid power)
8
130–150 mA
(Low2 power)
9
110–130 mA
(Low1 power)
10
(S-Low power)
11
FINAL AMP
IDLING CURRENT
(At 7.4 V)
[IP7]
1
1) Set the power supply voltage to 7.4 V.
2)
Connect an RF power meter to the antenna connector.
3)
Connect an ammeter between the power supply and transceiver.
–
VHF
(Hi power)
2
•
While transmitting, adjust the idling current using
[DIAL]
, and then
push
to store the adjustment value.
800–900 mA
(Mid power)
3
450–550 mA
(Low2 power)
4
150–250 mA
(Low1 power)
5
(S-Low power)
6
UHF
(Hi power)
7
790–890 mA
(Mid power)
8
440–540 mA
(Low2 power)
9
140–240 mA
(Low1 power)
10
(S-Low power)
11
NOTE:
When "
IDLING CURRENT
" is adjusted, "
TRANSMIT POWER
" must be alos re-adjusted.