Kenwood TH-235A Service Manual page 32

TH-235A/E/234
Common section
ADJUSTMENT
Item Condition Measurement point Adjustment Specification
Test Unit [Terminal] Unit | Parts Methoud
Equipment
1.Setting 1)Connect the DC IN
to the set.
Power supply : DC IN 12.0V
2.Line mode | 1)Turn on the SET with Shorting | Power No indication error in ail
set up the test point T. meter Check indication on.
F—counter LAMP on (Both side).
ojoctrnon CH: Oe MM, A. 234 OVM . 147.975MHz + 5OHZ : K
43 T E " ANT RF TC1 Adjust 173.900MHz +50Hz : M, A, 234
Transmit 145.975MHz + 50Hz: T, E
4.Lock volt. CH: 01:K
check (TX Lo} 24:M, A, 234 Check 1.8~2.8V:K, T,E
41:T,E ec 1.0~2.0V : M, A, 234
Transmit
§.Lock volt. CH: 04:K
check (RX Lo) 24:M, A, 234 Check 1.0~2.0V
44:T,E
6.Lock volt. CH: 03:K
check (TX Hi) 25:M, A, 234 2.1~3.5V:K,T,E
43:T,£ RF | Lv Check 5.2~8.2V:M, A, 234
Transmit
7.Lock volt. CH: 05:K
check (RX Hi} 25:M, A, 234 Check 4.0~6.2V
45:T,E&
8.Tuning volt. TP2 | RF | VR2 Adjust 3.74 0.1V
Adjustment
9.BPF CH: 01: K Spectrum L25
wore a m 'e 234 analyzer ANT RF et Adjust Refer to the follow waveform
TG :-40dBm
REF -16.4d8m ATT 1048 A_write B_write
5dB/ |
4 MKR
CENTER 8.00 MHz
144.00] MHz A —1,171dB
y N
4 N
f \
VA N
RBW A \
100 kHz 7
vBW N
1 kHz N
SWP
200ms
CENTER 144.00MHz SPAN 50.0 MHz
Transmitter section
1.Hipower | CH: 08 :K Power
Adjustment 28 : M, A, 234 meter Check More than 5.5W
: ANT
48 :T,E DC.A ; 5.0 + 0.1W
Transmit
RF
VR1 Adjust
Less than 1.7A
32