Mode : Mono - Rotel RT-955 Technical Manual

Adjustment
■ FM
* Necessary measurement equipment
RDS/STEREO Multiplexer
FM/AM Signal Generator
Audio Signal Analyzer
Oscilloscope
Digital Volt Meter (DVM)
(A) Center adjust
❏ RDS/STEREO Multiplexer Setting

– MODE : MONO

– Audio Frequency : 1KHz
❏ FM Signal Generator Setting
– Deviation : 75KHz
– Radio Frequency : 98.0MHz
– Output Level : 66dB
❏ RT955 Setting
– FM Frequency : 98.0MHz
– Antenna Selection : A
– FM MODE : MONO
– IF MODE : WIDE
Oscilloscope
Audio
Signal
Monitor
Analyzer
(FM-DET-B)
TL 202
TL 201
(FM-DET-A) R 282
q Turn FM Signal Generator Modulation on
w Connect DVM (+)(-) terminals to both ends of resistor R282 and measure the volt.
e Make this measured volt '0' by adjusting TL201(FM-DET-A Coil).
(The adjustment should be within ±2mV)
r After this adjustment, measure THD(Total Harmonic Distortion) with Audio
Signal Generator.
t Adjust THD to minimum point with TL202(FM-DET-B Coil).
(THD should be within 0.5%)
1 unit
1 unit
1 unit
1 unit
1 unit
L-CH
(or R-CH)
BACK
Jack 2
IC 203
FRONT
6
FM
Signal
Generator
Ant-B Ant-A
(ANT 201) (ANT 200)
DVM
(+)
(-)
Stereo
Multiplexer