Section 2 Electrical Adjustments - Sony TMR-RF950R Service Manual

Note:
The adjustments should be performed in the order given.
2-1. Transmission Frequency Check and Adjustment
Preparation:
AF OSC
ATT
+
+
+
–
– –
600 Ω
AUDIO IN (J403: Lch)
1 kHz 40 mVrms
Procedure:
1. Turn OFF the noise filter switch (S401) on the TX-BASE board.
2. Enter 1 kHz 40 mVrms signal only to the Lch (J403) on the TX-BASE board.
3. Connect a rod antenna to the input of frequency counter, and adjust its length to about 8 cm.
4. Install the set in the vicinity of frequency counter, and check that the frequency on each channel is as specified value.
Specified value:
913.0 MHz ± 100 kHz
CH1
914.0 MHz ± 100 kHz
CH2
915.0 MHz ± 100 kHz
CH3
5. If out of the specified value, adjust the frequency by rotating RV402 and RV403 on the TX-BASE board.
6. After adjustment, recheck the frequency on CH1, CH2, and CH3.
Adjustment Location: TX-BASE board (See page 6.)
2-2. Degree of Modulation of Subcarrier (L – R) Check and Adjustment
Preparation:
AF OSC
ATT
+
+
–
–
[TX-BASE board] – Conductor Side –
ELECTRICAL ADJUSTMENTS
TMR-RF950R
Trans-
mitter
AUDIO IN (J403: Lch)
1 kHz 316 mVrms
TMR-RF950R
+
Trans-
–
mitter
600 Ω
SECTION 2
frequency counter
+
–
– 4 –
AC voltmeter