SONY TMRIF630R
Service Manual

SECTION 3 ELECTRICAL ADJUSTMENTS
Note : 1. The adjustments should be performed in the order given. (As a general rule the transmitter section (TMR-IF630R) adjustments should be completed before performing the headphones section (MDR-IF630R) adjustment.) 2. The adjustments and measurements should be performed for both L-ch and R-ch unless otherwise indicated. 3. L-ch adjustment should be completed before performing R-ch adjustment. 4. Supply 9 V dc to the transmitter section (TMR-IF630R) and 2.4 V dc to the headphones section (MDR-IF630R) as the power voltage. TRANSMITTER SECTION [ OSCILLATING FREQUENCY ADJUSTMENT ] Connection :
Frequency counter TX BASE board TP11 iL-ch j TP13 iR-ch j

[ RF LEVEL ADJUSTMENT ] Connection :
RF voltmeter TX BASE board TP11 (L-ch) TP13 (R-ch) TP15 (GND)

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Adjustment Procedure : No signal state. 1. Connect the RF voltmeter to TP11 (L-ch) and TP13 (R-ch) on the TX BASE board. 2. Adjust with RV51 (L-ch) and RV1 (R-ch) on the TX BASE board so that the reading on the RF voltmeter becomes the specified value. Specified Value : L-ch R-ch RV51 RV1 480 mV ± 2.5 mV 480 mV ± 2.5 mV

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TP15 iGND j

Adjustment Procedure : No signal state. 1. Connect the frequency counter to TP11 (L-ch) and TP13 (Rch) on the TX BASE board. 2. Adjust with L51 (L-ch) and L1 (R-ch) on the TX BASE board so that the reading on the frequency counter becomes the specified value. Specified Value : L-ch R-ch L51 L1 2.3 MHz ± 2kHz 2.8 MHz ± 2kHz

Adjustment Location : � TX BASE BOARD (Conductor side) �
TP15 (GND) TP11 (L-ch) TP13 (R-ch) RV51 RF level adjustment (L-ch) L51 Oscillating frequency adjustment (L-ch) RV1 RF level adjustment (R-ch) L1 Oscillating frequency adjustment (R-ch)

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