Onkyo TX-2500 - FM Front End Alignment

FM Signal Dial Output Adjust
Generator
to
set
TX—4500
TX—2500
Indicator
for
Remarks
; Quiet T101 T101 DC Volt
98MHz
400Hz
98MHz
T101
T101
Distortion
Minimum
|
Set
the
output
voltage
to
100% mod. 60dB Top To Analyzer Distortion | 3V with VOLUME.
Repeat step 1 and 2 as necessary.
adam fe |
ca
a
”
Center
106MHz
400Hz
106MHz
OSC
Trimmer|
OSC
Trimmer}
Same
as
0
100%
mod.
60dB
TCS(TC
0)
TC5
above
Repeat step 5 and 6 as necessary.
90MHz 400Hz
100% mod.
AC VTVM or
Oscilloscope
Maximum
TCI(TCA)
TC3(TCR1)
TC4(TCR2)
Set FM Signal Generator
level as low as possible.
fig—16
106MHz 400Hz
100% mod.
Same as
above
106MHz
Maximum
Repeat step 8 and 9 as necessary
98
MHz
400Hz
IF
Core
Top
|
IF
Core
AC
VIVM
or
7
tl
100%
mod.
98MHz
ane
Bottom
L4
Oscilloscope
Maximum
FM
MONO
DISTORTION
AND
MULTIPLEX
ALIGNMENT
EXT.
mod.
Connect
AC
VTVM
across
SPEAKER
terminals.
Distortion
Analyzer
Frequency
.
Oscilloscope
onme °M Sign: Dial to Output vast f
I'M Signal Generator | Stereo Modulator TX 4500 TX_2500 Adjust for Remarks
Mono 98MHz 400Hz T101 T1601 a
98MHz 400Hz Frequency +
STEREO INDICATOR should light up when stereo program is being received.
Pilot Sig. 10%
Multiplex Main & Sub Sig. | 98MHz R138 R157 Nh Minimum
1KHz Lch 90% emu ee
Pilot Sig. 10%
Main & Sub Sig. | 98MHz R138 R157 ach
1KHz Rch 90%
Distortion
Analyzer
Repeat step
1 & 2 as
necessary
98MHz EXT. Mod.
Same as above
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