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 108MHZ 88MHZ 98MHz
108MHZ 90MHZ
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.
98MHz+ 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.
98MHz 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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