Luxman r 1120 service manual

Page 1

ULTIMATE VHIGH FIDELITY STEREO COMPONENTS

ALL DGMJM

I R-112O

SERVICE MANUAL

Page 2

R-llZO TUNER SECTION ALIGNMENT PROCEDURE

[CAUTION]

1. FM alignment should be done after 5 minutes of the power switch "ON.

2. Low distortion 56 or stereo signal generator is indispensable for the FM-mono,

stereo alignment procedure.

Preliminary 1. Voltage selector must be at the appointed voltage.
Check
2. Fuses on PB71127 must be the appointed one.
3. Set the Input Selector Switch to the "AM" position.

4. Set the Dial Pointer to the maximum-right position.

r5. Set all semifixed pots to their center position.

6. Select the Devemphasis switch to the appointed time-
constant.

AM Section 7. Push the Power Switch to "ON, and confirm if there is
Alignment no trouble.
8. Measure the voltage at the (+) side of power rectifying
diode D110, which must be 13V -1V.

9. Voltage at Pin No. 71 or No. 72 must be 13V :lv.

10. Set the output of 4SSkHz Sweep Generator for AM at 40dB,
and connect it to Pin No. 64. At the same time connect
the line input of the SC to the No. 66.

11. Adjust the Ceramic Filter T105, T106, and T107 to have
symmetrical response.

12. Set the loop antenna connected to AM-SG at the measuring
position.

13. Connect oscilloscope and milivoltmeter to the REC. OUT
terminal.

14. Obtain 400Hz 30% modulation on AM 56, and set the output
attenuator at 80dB.

15. Set both SG and the dial pointer at 600kHz.

16. Adjust T104, Ferrite-core antenna and RF coil T103 to obtain
maximum response on the signal meter or 400Hz sine-wave.

17. Set 56 and the Dial Pointer at l400kHz.

18. Adjust 3 trimmers on top of the variable capacitor (viewing
from front, the center one is for the 05C.) to obtain
maximum response on the Signal Meter or 400Hz sinevwave.
Repeat steps 15 - 18 for 2 or 3 times to obtain maximum
sensitivity.

19. Set 56 and the Dial Pointer at IOOOkHz, and at maximum output
level (lZGdB), adjust VRlOS to have 4.5 reading on the Signal
Meter calibration.

20. Check that all the specification items, sensitivity, output

level, etc., are fulfilled.