Service manual

TH-K4AT/K4E
37
ADJUSTMENT
Item Condition
Measurement Adjustment
Specifications/
Test equipment Unit Terminal Unit Parts Method
Remarks
Switch to Adjustment mode
and carry out the operations
for adjustment item D.
(Refer to page 29)
S-meter 3) LCD display: S1 SSG TX-RX ANT [MENU] Write
Frequency: 435.050MHz (A/3)
SSG: –120dBm (0.22uV)
4) LCD display: S9 [MENU] Write
Frequency: 435.050MHz
SSG: –105dBm (1.26uV)
4.Squelch Squelch level: 1
Check 1) Frequency: 435.050MHz SSG Check Open Squelch
SSG output: –123dBm (0.158uV) Oscilloscope
SSG MOD: 1kHz Distortion meter
SSG DEV: 3kHz
2) SSG: OFF Close Squelch
5.S-meter 1) Frequency: 435.050MHz SSG Check Two segments
Check SSG output: –120dBm (0.22uV) in S-meter light.
■■
2) SSG output: –105dBm (1.26uV) All segments in
S-meter light.
■■■■■■■■■
6.Hum and 1) Frequency: 435.050MHz SSG TX-RX ANT
noise ratio SSG output: –53dBm (501uV) Oscilloscope (A/3) SP
Check SSG MOD: 1kHz Distortion meter
SSG DEV: 3kHz AF V.M
AF Output: 0.63V/8Ω
AF V.M = 0dB
2) SSG DEV: OFF Check –38dB or less
7. AF distortion 1) Frequency: 435.050MHz Check 5% or less
Check SSG output: –53dBm (501uV)
SSG MOD: 1kHz
SSG DEV: 3kHz
AF Output: 0.63V/8Ω
8.AF output 1) Frequency: 435.050MHz Check 400mW or more
Check SSG output: –53dBm (501uV)
SSG MOD: 1kHz
SSG DEV: 3kHz
AF distortion: 10%
9.Current Squelch level: 5
Drain 1) Frequency: 435.050MHz SSG Check 80mA or less
Check SSG output: OFF Am meter
2) Frequency: 435.050MHz 400mA or less
SSG output: –53dBm (501uV)
SSG MOD: 1kHz
SSG DEV: 3kHz
VOL knob: Max