Kenwood TK-280 Service Manual page 40

TK-280
Common Section
Item Condition
1. Setting 1) BATT terminal voltage:7.5V
2) SSG Standard modulation
[Wide] MOD:1kHz, DEV:3kHz
[Narrow] MOD:1kHz, DEV:1.5kHz
2. VCO lock [Panel Test Mode]
voltage 1) CH-Sig:2-1
RX 2) CH-Sig:3-1
TX 3) CH-Sig:2-1
PTT:ON
4) CH-Sig:3-1
PTT:ON
Transmitter Section [Panel Tuning Mode except when Panel TEST Mode is specified.]
Item Condition
1. Frequency 1) Adj item [FREQ]
Adjust Adjust [∗∗∗]
PTT:ON
2. Max Power 1) Adj item [HPOW]
Check Adjust [256]
2) Adj item
[L HPOW] ➞ [L2 HPOW] ➞ [C HPOW] ➞ [H2 HPOW] ➞ [H HPOW]
Adjust [256]
PTT:ON
3. Hight Power 1) Adj item [HPOW]
Adjust Adjust [∗∗∗]
2) Adj item
[L HPOW] ➞ [L2 HPOW] ➞ [C HPOW] ➞ [H2 HPOW] ➞ [H HPOW]
Adjust [∗∗∗]
PTT:ON
4. Hight Power [Panel Test Mode]
Check 1) CH-Sig:1-1
PTT:ON
2) CH-Sig:2-1
PTT:ON
3) CH-Sig:3-1
PTT:ON
5. Low Power 1) Adj item [LPOW]
Adjust Adjust [∗∗∗]
2) Adj item
[L LPOW] ➞ [L2 LPOW] ➞ [C LPOW] ➞ [H2 LPOW] ➞ [H LPOW]
Adjust [∗∗∗]
PTT:ON
6. Low Power [Panel Test Mode]
Check 1) CH-Sig:1-1
Set low power (Push [B])
PTT:ON
2) CH-Sig:2-1
PTT:ON
3) CH-Sig:3-1
PTT:ON
40
ADJUSTMENT
Measurement
Test equipment Unit Terminal
Power meter Panel ANT
DVM TX-RX CV (CN14)
Measurement
Test equipment Unit Terminal
Power meter Panel ANT
Am meter
Adjustment
Unit Parts Method
Check
Adjustment
Unit Parts Method
Panel Encoder Center frequency
knob ± 100Hz
(Note:) After replacing the VCXO
(X1), align using KPG-49D.
Check
Encoder K, K3, M :
knob 5.0W
K2, K4 :
4.8W
Check
0.8W
Check
Specifications/
Remark
0.8V or more
4.4V or less
0.8V or more
4.4V or less
Specifications/
Remark
5.3W or more
±0.1W
2.2A or less
K, K3, M :
4.8~5.2W
K2, K4 :
4.6~5.0W
2.3A or lessZ
±0.1W
1.0A or less
0.5~1.5W
1.2A or less