Section 3 Electrical Adjustments - Sony TMR-IF630R Service Manual

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 sec-
tion (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 :
TX BASE board
TP11 L-ch
i j
TP13 i R-ch j
Adjustment Procedure :
No signal state.
1. Connect the frequency counter to TP11 (L-ch) and TP13 (R-
ch) 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 speci-
fied value.
Specified Value :
L-ch L51 2.3 MHz ± 2kHz
R-ch L1 2.8 MHz ± 2kHz
Adjustment Location :
– TX BASE BOARD (Conductor side) –
SECTION 3
ELECTRICAL ADJUSTMENTS
Frequency counter
+
–
TP15 i GND j
TP11 (L-ch)
RV51
RF level
adjustment
(L-ch)
L51
Oscillating frequency
adjustment
(L-ch)
— 4 —
[ RF LEVEL ADJUSTMENT ]
Connection :
TX BASE board
TP11 (L-ch)
TP13 (R-ch)
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 speci-
fied value.
Specified Value :
L-ch RV51 480 mV ± 2.5 mV
R-ch RV1 480 mV ± 2.5 mV
TP15 (GND)
TP13
(R-ch)
RV1
RF level
adjustment
(R-ch)
L1
Oscillating frequency
adjustment
(R-ch)
RF voltmeter
+
–
TP15 (GND)