CM151
3-7
CA - SERVICING
Adjust
A ATT
register in IC1400 for 490 mVrms (±
10mVrms) in TVOUT-L output, pin 44 of IC1400 for MTS
models and at pin 11 for STEREO models.
Stereo, SAP VCO adjustment
(only for MTS models)
Set bits TEST-DA = “1” and TEST1 = “0” of IC1400.
Monitor the TVOUT-R output frequency (pin 43 of
IC1400) in a no input state.
Adjust A VCO register of IC1400 so that frequency is as
close to 62.936 KHz (± 0.5 KHz) as possible.
Stereo, SAP dbx filter adjustment
(only for MTS models)
Set bits TEST-DA = “0” and TEST1 = “I” of IC1400.
Input 9.4 KHz, 600mVrms to COMP-IN pin 19 of IC1400.
While monitoring the STATUS FLAG (FILADJ bit, see figure
2) of IC1400, adjust A FILTER register. Align with the
center of the FILADJ = 1 .
IF AND AUDIO ALIGNMENT PROCEDURE (continued)
Separation Adjustment (for MTS and Stereo models)
Set bits TEST-DA = 0 and TEST1 = 0 of IC1400 for MTS
models.
Set the chassis for RF input.
Set IC1400 to stereo mode.
a) Input signal: PIF 30 dBmv modulated with color bars
at 85% mod., SIF 19 dBmv modulated with stereo
signal, 300 Hz at 12.9 KHz deviation (30 % mod.),
left channel only, dbx ON.
b) Adjust
WIDEBAND
register to reduce right speaker
output at the minimum. Set the frequency only of
SIF signal to 3 KHz. Adjust
ASPECTRAL
register to
reduce right speaker output at the minimum.
MICRO
LOCATION
RANGE
PRESET VALUE
221-01384
-
-
-
221-01385
30
0-63
31
221-01386
-
-
-
221-01387
27
0-63
31
A VCO
MICRO
LOCATION
RANGE
PRESET VALUE
221-01384
33
0-63
31
221-01385
17
0-63
31
221-01386
17
0-63
31
221-01387
16
0-63
31
ASPECTRAL
MICRO
LOCATION
RANGE
PRESET VALUE
221-01384
34
0-63
31
221-01385
33
0-63
31
221-01386
31
0-63
31
221-01387
30
0-63
31
WBAND
