Sony tmr rf 830 r service manual
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Extracted text from sony tmr rf 830 r service manual (Ocr-read)
Page 1
Note : Follow the disassembly procedure in the numerical order given. SECTION 1 DISASSEMBLY Ñ 2 Ñ 1-1. TX BOARD, VCO BLOCK Cabinet (Upper ) Vco block 7 Remove solder 7 Remove solder 8 Remove solderTX board 6 TX shield plate 5 TX shield plate 1 Screws +P2 ´ 10Cabinet (Lower) 92 4 3
Page 2
TMR-RF830R Note : 1. The transmitter section adjustments should be completed before per- forming the headphones section adjustment. 2. On adjusting the transmitter section, use the headphones as a jig. SECTION 2 ELECTRICAL ADJUSTMENTS Ñ 3 ÑÑ 4 Ñ Send Frequency Check and Adjustment 1. Set the noise filter SW to OFF. 2. Input a signal of 1 kHz 40 mVrms to only the L-CH (J403). 3. Connect a telescopic antenna to the frequency counter input and extend the antenna to a length of approximately 8 cm. 4. Place TX board close to the frequency counter, then measure the frequencies of CH1 and CH2 and make sure the values are as follows: CH1 : 863.27 to 863.37 MHz CH2 : 863.62 to 863.72 MHz When the frequency is not satisfied the specified value, first set the channel switch (S402) to Ò2Ó and adjust CH2 frequency with L412, next set it to Ò1Ó and adjust CH1 frequency with L413. When completed with adjustment, recheck the frequecies of CH1 and CH2. Main-Carrier (L+R) Modulation Check and Adjustment 1. Set the noise filter SW to off. 2. Set the channel to CH2. 3. Input a signal of 1 kHz 316 Vrms to the L-ch (J403) and the R- CH.(J402) 4. Measure the pin 2 voltage of the TX board RV 404 using a digital voltmeter (AC range) and make sure the value is 75 to 95 mVrms. If the measured value is other than the specified value, adjust to 85mVrms by turning the RV 404 on the TX board. Connection points and Adjustment Location : TX board (See page 4)[TX BOARD] (Component side) Sub-Carrier (L-R) Modulation Check and Adjustment 1. Set the noise filter SW to OFF. 2. Set the channel to CH2. 3. Input a signal of 1 kHz 316 mVrms to the L-CH (J403). 4. Measure the pin 1 voltage of the TX board IC403 using an digital voltmeter (AC range) and make sure the value is 220 to 250 mVrms. If the measured value is other than the specified value, adjust to 235mVrms by turning the RV401 on the TX board. Connection points and Adjustment Location : TX board (See page 4) Sub-Carrier Frequency/Level Check and Adjustment 1. Set the noise filter SW to OFF. 2. Set the channel to CH2. 3. Input a signal of 1 kHz 316 mVrms to only the L-CH (J403). 4. Connect a frequency counter and an oscilloscope between the pin 2 of RV402 and GND. 5. Set the TX board L-CH (J403) input to OFF (not doing so will cause modulation in the sub-carrier, preventing correct mea- surement) 6. Check to make sure the frequency counter reading is 49 to 51kHz. If the measured value is other than the specified value, adjust the frequency to 50 kHz by turning the RV405 on the TX board. In addition, check to make sure the oscilloscope wave- form is as follows : HeadphonesMDR-RF830 80 – 100mVp-p 134 5 -1 -2 Frequency counter Oscilloscope Sub-Carrier Frequency Adjustment RV402 L412 (CH2) L413 (CH1) S401 Noise Filter ON/OFF Switch J402 (R-CH) RV404 : Main-Carrier (L+R) Modulation Adjustment RV401 : Sub-Carrier (L– R) Modulation Adjustment RV405 : Sub-Carrier Frequency AdjustmentSend Frequency Adjustment J403 (L-CH) Sub-Carrier Level Adjustment 1 -1 -2 2 CHANNEL Digital voltmeter (AC range) Main-Carrier (L+R) Modulation Adjustment Sub-Carrier (L-R) Modulation Adjustmen t Digital voltmeter (AC range) TransmitterTMR-RF830R Setting : 7. When the waveform P-P level is not satisfied the specified value, adjust to 90mVp-p with RV402. (Perform the check and adjustment within one minute since the transmitter AUTO OFF function will be activated approximately one minute after setting the transmitter L-ch input to OFF. If the AUTO OFF function activates, set the L-ch input to ON, set TX board to AUTO ON, set the L-ch input again to OFF, then make the check adjustment.) Connection points and Adjustment Location : TX board (See page 4) AF signal generator Telescopic antenna 8 cm L-CH (J403) TMR-RF830Rset TMR-RF830Rset Frequency counter MDR-RF830 Headphones Battery terminal (DC 3V)