23
RPTch
RPTch
FM RF signal
generator
antenna
terminal
0.01
µ
F
set
TUNER SECTION
Cautions during repair
When the tuner unit is defective, replace it by a new one because
its internal block is difficult to repair.
TEST MODE
This set have the test mode function. In the test mode, FM Auto
Scan/Stop Level and AM Auto Scan/Stop Level adjustments can be
performed easier than it in ordinary procedure.
<Set the Test Mode>
1. Supply 14.4 V DC to ACC and Back-up.
2. Push the PWR button to turn the tuner off. The tuner enters the
time display mode.
3. Turn the ACC power OFF.
4. Turn the ACC power ON by pushing the ^ and 1 keys simul-
taneously for longer than 4 seconds.
5. Push the 4 key twice within 1 second after releasing the ^ and
1 keys. All indications on the display will light up.
6. Push the PWR button once. “
” will be displayed and the
tuner enters the Test mode.
7. Push the 1 key once. The tuner enters the Tuner SD ADJ mode.
<Release the Test Mode>
1. Push the PWR button once while the tuner is in the Tuner SD
ADJ mode. The Tuner SD ADJ mode will be released and the
tuner will display “
” again.
2. Push the PWR button once while the tuner is displaying “
”.
The Test mode will be released.
Note on Adjustment
The adjustments of tuner section, should be performed according
to the following sequence.
1. FM Auto Scan/Stop Level Adjustment
2. FM Noise Focus Adjustment
3. FM Stereo Separation Adjustment
4. AM Auto Scan/Stop Level Adjustment
Carrier frequency : 98.0 MHz
Output level
: 24 dB (15.8 µV)
Mode
: mono
Modulation
: 400 Hz, 22.5 kHz deviation (30%)
Procedure :
1. Set to the test mode (Tuner SD ADJ mode).
2. Push the FM button and set to FM.
3. Push the preset 3 button.
Display
FM Auto Scan/Stop Level Adjustment
Setting :
FM button : FM
0 dB = 1 µV
4. Turn the volume RV2 on TU1 counterclockwise, and then ad-
just the volume by turning it clockwise little by little until the
“
” indication begins to flash on the display.
Display
Adjustment Location : See page 25.
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