Electrical Adjustments; Test Mode; Md Section; Tuner Section - Sony MDX-C8900R Service Manual
Fm/mw/lw
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Also See for MDX-C8900R:
- Operating instructions manual (186 pages) ,
- Service manual (88 pages)
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TEST MODE
This set have the test mode function. In the test mode, FM Auto
Scan/Stop Level and MW Auto Scan/Stop Level adjustments can
be performed easier than it in ordinary procedure.
<Set the Test Mode>
1. Set the "power select" switch (SW500) is "A (ON)" position.
2. Turn ON the regulated power supply. (All LEDs on the set
lights up, and the clock is displayed.)
[OFF]
Note: Press the
button, if the clock is not displayed.
[4]
3. Push the preset
button.
[5]
4. Push the preset
button.
[1]
5. Press the preset
button for more than two seconds.
6. Then the display indicates all lights, the test mode is set.
<Release the Test mode>
[OFF]
1. Push the
button.
2. Return the "power select" switch (SW500) to initially set po-
sition.
See the adjustment location from on page 28 for the ad-
justment.
MD SECTION
MD section adjustments are done automatically in this set.
SECTION 3
ELECTRICAL ADJUSTMENTS
TUNER SECTION
Cautions during repair
When the tuner unit is defective, replace it by a new one be-
cause its internal block is difficult to repair.
Note: Adjust the tuner section in the sequence shown below.
1. FM Auto Scan/Stop Level Adjustment
2. FM Stereo Separation Adjustment (Wide)
3. FM Stereo Separation Adjustment (Narrow)
4. FM RDS S-Meter Adjustment
5. MW Auto Scan/Stop Level Adjustment
FM Auto Scan/Stop Level Adjustment
Setting:
Procedure:
1. Set to the test mode.
2. Push the
3. Adjust the volume RV2 on TU1 by turning clockwise untill
Adjustment Location: See page 28.
– 25 –
0 dB=1µV
[SOURCE]
button : FM
FM RF signal
generator
0.01 µ F
Carrier frequency
: 98.00 MHz
: 22 dB (12.6 µ V)
Output level
Mode
: mono
Modulation
: 1 kHz, 22.5 kHz deviation (30%)
[SOURCE]
button and set to FM.
Display
SHUF
REG
"0" is shown next to "FM" on the display window, If "0" is
already shown or the volume RV2 has been turned too far,
turn it back counterclockwise untill "0" is disappeared once,
then try this adjustment.
Display
SHUF
REG
antenna jack (CN1)
set
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