Acoustic research X 04 Service Manual

Page 2

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FM lF, RF Alignment and FM MPX Alignment

Instruments: FM Signal Generator. (400i-iz. 100% Modulated) T.H.D. analyzer. Oscilloscope. AC VTVM. DC Voltmeter.

Terminated :

Tuning Meter

FM Stereo Generator. AC VTVM. Oscilloscope. Frequency Counter and THO Analizer

DC Voltmeter...8etween 4 and E5 On TH-IF-151 PCB. (Step 1.2)

Tuning Meter...8etween TP1 and TP2 On TH-iF-151 P.C.B. (Step 8)

Generator - -
Step it Eff? 0" Adjust Adjust for
Coupling Frequency tt 9
1 87.5 MHz L105 1.4V reading on DC Voltmeter
F No use.
2 108 MHz CT103 9V reading on DC Voltmeter
3 Repeat steps 1 and 2 unit no further improvement is noticed.
4 90 MHz 90 MHz 331' L102 Maximum reading on AC VTVM.
Antenna
5 terminal L104 Adjust balance at wave term
6 105 MHz 105 MHz CT101. CT102 Maximum reading on AC VTVM.
7 Repeat steps 4.5 and 8 unit on further improvement is noticed
3 Antenna L106(A) Adjusting center on Tuning Meter
terminal 90 MHz 90 MHz
9 "W "9" L106(B) Minimum reading on T.i-I.D. Analyzer
10 Repeat steps 8 and 9 unit no further improvement is noticed
F
Antenna terminal
11 15W input 90 MHz 90 MHz V8 101 Muting Level (Auto Position)
10W input (Europe
Antenna trminal .
F 12 1mV WM 90 MHz 90 MHz VR 102 Signal Indicator Level 5th LED light on
Antenna terminal 98 MHz Pilot...10%
I 13 1mV input 1 KHz...90% Mod. 98 MHz VR 301 Best separation No need to Adjust VCO