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I
CAUTION ON RF ADJUSTMENT
This model uses a microprocessor
for memory preset control
for the various
bands.
This function
has been
used to preset
frequency
points
for the different
bands to permit
adjustment
and make it
possible
to check the function
of the microprocessor.
To use this supplemental
function,
ground
initialize
point
jumper
wire JM826 for 1 second before beginning
adjustment.
The following
table shows the initially
preset fre-
quencies.
NOTE: If the AM tuning cannot be obtained
properly,
then cut off the jumper wire JP801 (located near the connector
CN802). 10kHz step will be set (factory adjusted to 9kHz position).
Band
Memory
1
2
3
4
5
6
FM-1
87.5 MHz
108 MHZ
88 MHZ
98 MHz
108 MHZ
90 MHZ
AM(9kHz)
531kHz
1602kHz
603kHz
1404kHz
999kHz
522kHz
AM(lOkHz)
520kHz
1710kHz
600kHz
1400kHz
1000kHz
520kHz
SYSTEM CLOCK ADJUSTMENT
Since this adjustment
sets standard
time for the total system, be sure to adjust before operation,
1.
Connect the TP811 to the ground (The FL indicator
goes out.)
2.
Connect the Frequency
Counter between the TP81O and ground.
3.
Adjust the TC804 until the Frequency
Counter reads 65,536kHz *0.1 Hz.
(Avoid the minus " -"
disparity
as much as possible
in case the clock lags behind.)
4.
After the adjustment,
Disconnect
the TP811 from the ground and the original
mode is returned.
FM TUNER ALIGNMENT
FM ALIGNMENT
- FUNCTION switch to FM ST/MUTE position.
Note: It is almost unnecessary to adlust coil in Front End as Perfectly adlusted
.
.
ITEM
GENERATOR
DIAL SETTING
INDICATOR
PROCEDURE
1. CENTER
Connect FM RF signal
Set Preset
Connect DC Volt-
Adjust FM DET 1st Coil (T806) until
VOLTAGE&
generator
through FM
STATION button
meter across
DC Voltmeter
reads OV *50mV.
DETECTOR
Dummy Antenna to FM
to "4" position.
TP804 and TP805.
ADJUSTMET
Antenna terminals.
Set to 98MHz.
(MiNIMUM
Set generator
output
Set FM MODE
Connect Harmonic
Adjust FM DET 2nd Coil (T807) for
T. H.D.)
level to 60dBpV at
switch to MONO,
Distortion
minimum
gain and best linearity.
98 MHz+ 2kHz.
Analyzer
to
DAT OUT.
Note: Repeat Step 1 (FM DET 1st Coil T806) and 2 (FM DET 2nd Coil T807) until optimum
alignment
is reached,
2. FM AUTO
Same as above.
Same as above.
Front panel
Set FM MODE Switch to ST/MUTE.
STOP
Adjust attenuator
output
TUNED
indicator
Adjust P801 until the TUNED
ADJUSTMENT
level for 16dBpV.
Display.
Indicator
partly light up.
Note: Decrease the output level of ATT and confirm that the wave form disappears.
Increase the output Ievei of ATT again and
confirm that the input level meets the specifications
sufficiently
when the wave form has appeared.
3. FM STEREO
Connect FM Stereo SG
Same as above
Connect AC VTVM
SIGNAL
to FM Antenna terminals.
and Oscilloscope.
SEPARATION
Set generator
output
to (Right Channel)
CONTROL
level to 60dBpV at
DAT OUT.
98 MHz stereo signal
Adjust P803 for minimum
output
(lkHz-90°A,
Pilot-10%)
and checking the STEREO
from LEFT channel.
Indicator
light up.
Same as above for
Connect AC VTVM
RiGHT channei.
and Oscilloscope
0
to (LEFT channel)
DAT OUT
.
.
.
use a Screwdriver
with plastlc grip tor all adjustments.
–14–
<
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