Luxman 5 t 50 service manual

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Z

FREQUENCY SYNTHESIZED FM TUNER

LABORATORY
REF ERENCE
SERIES

SERVICE MANUAL

Page 2

STSO Alignment Procedure (P

OSCILLO-
PM so, 5011:30011 MILIVOLT' scope
srso METER or
:/° F:
® _ @ DIST.METER SYNCHRO "
1231094 -
CR osc ' 7,, ® ® :1,

CENTER
METER

FREQUENC MILIVOLT-
COUNTER METER

Connect test equipment as per the diagram shown above. Use "300 ohms terminal
for the ANT Terminal, and set the attenuator to "OFF". Connect the Milivoltmeter and
distortion meter to the "AUDIO OUTPUT 2", and set the level control to the "MAX." position.
Then set the switches on the front panel of the STSO to the following positions;

(1) Set 2 push switches provided to the left of the power switch to the "protruded"
position.

(2) Set the muting switch to the "off" position, and the other lever switch to the

center "normal" position.
(3) Set the Mode Switch to the auto" position.

(4) Depress the "manual" tuning switch.

Now, check the. de-emphasis switch on 17131094. Then depress the power switch to
ON", and if no trouble found, proceed to the following alignment.

(1) Set the receiving frequency to the edge of the lowest side. (In case a broad-
casting station is located there, set it to a nearby frequency at which no signal

is received.)

(2) Set signal of SG to 4001-12, 100% modulation, output level lmV, and adjust the
frequency to that of the STSO.

(3) Set both of VR201 and VR202 on P131094 to the extreme clockwise position.

(4) Confirm 400Hz sine-wave on oscilloscope.

(5) Adjust 86 output to the minimum.

(6) Obtain precise center indication on the center meter by adjusting T201 on P131094.
(7) Take same procedure as described in step No. 2.

(8) Adjust T202 on P31094 and obtain the minimum reading on the distortion meter.

(no more than 0.196)

(9) Repeat steps No. 5 - No. 8 three or four times.