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Service Mode (Electronic Controls, Continued)
Note: Set the 30% modulation with the P.L and
N.R. switches OFF then turn them ON while
testing.
5. Adjust MTS High-Level Separation (SEPAH) data
until the amplitude of the waveform measured on
the scope is minimum.
6. Repeat above steps 3 through 4 until the amplitude
is at minimum for both signals.
Clock Adjustment (CLOCK)
Preparation:
Connect the frequency counter from IC001 MPU
Pin 10 or TPA009, to cold ground ( ).
Note: Frequency Counter probe capacitance should
be 8pF or less.
Procedure:
1. Turn the PTV "ON" with the AC power applied.
2. Measure TPA009 IC001 MPU pin 10 for frequency
and record the reading.
Note: Pin 10 measurement must have at least four
digits of resolution following the decimal point.
Example: 000.0000
3. Place the PTV into Service Mode for making
electronic adjustment, select the Clock Adjustment
DAC CLOCK and change value to 128.
4. Calculate
and
set
following formula:
=
128
+
CLOCK
0.450x106x
Note: Pin
10
measurement
regardless of the value stored in CLOCK.
Service Manual
CLOCK
based
on
the
{
(
) Hz
[
]
}
–
pin
732.4220
10
---------------------------------------------------------------- -
732.4220
will
not
change
- 32 -
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