-38-
1. Pressing any function key during PLAY stops the test mode.
2. After repeating the focus search for three times, then the gain is changed to the CR-RW gain value from the 4th focus search.
3. Do not keep pressing the FF button or the RWD button. If the FF button or the RWD button is kept pressed when the optical pickup stays in
the innermost track or in the outermost track, the gear can be damaged because the sled motor keeps rotating.
4. Align the alphabetical letters in the front of the MAIN C.B and the DECK C.B with the alphabetical letters printed on conductor side of the
boards.
<TUNER Section>
1. VT Check (AM)
Conditions
O
Measuring equipment: Digital multimeter
Test point: TP4 (VT) and GND
1) Connect a digital multimeter between TP4 (VT) and GND.
2) Set the function switch to AM and tune the reception frequency to 1,602 kHz.
3) Check that the digital multimeter reading is 9.0 V or less.
4) Tune the reception frequency to 531 kHz.
5) Check that the digital multimeter reading is 0.5 V.
2. VT Adjustment and Check (FM)
Conditions
O
Measuring equipment: Digital multimeter
Test point: TP4 (VT) and GND
Adjustment location: L907
1) Connect a digital multimeter between TP4 (VT) and GND.
2) Set the function switch to FM and tune the reception frequency to 108.0 MHz.
3) Adjust L907 until the digital multimeter reading is 7.0
±
0.1 V.
4) Tune the reception frequency to 87.5 MHz.
5) Check that the digital multimeter reading is 1.5 V or less.
3. Clock Check
Conditions
O
Measuring equipment: Frequency counter
Test point: TP1 (CLOCK) and GND
1) Connect a frequency counter between TP1 (CLOCK) and GND.
2) Set the function switch to AM and tune the reception frequency to 1,602 kHz.
3) Check that the frequency counter reading is 2,052 kHz
±
45 H.
<AM Adjustment>
Before starting the AM adjustment, perform the preparation shown below.
Preparation
O
Measuring equipment: Standard signal generator (S.S.G), loop antenna, oscilloscope, milli-volt meter and dummy resistor (6
Ω
)
ELECTRICAL ADJUSTMENT-2/6
V
DIGITA L MULT IMETER
TP4(VT)
GND
Hz
FREQUENCY COUNTER
GND
TP1(CLOCK)
DUMMY
SPOUT(L)
AC MILLIVOLT METER
CH2
CH1
6
OUTPUT
OSCILLOSCOPE
CH2
CH1
LOAD
60cm
SET
SPOUT(R)
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