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[Multi Channel Sound Circuit]
3. Input Level
Measuring
instrument
Test point
EXT trigger
Measurement
range
Input signal
Input terminal
Symptom when
Adjustment purpose
Set the level of the input signal for the multi channel sound circuit.
Distorted sound during an MCS broadcast.
incorrectly adjusted
Oscilloscope
TPM2
DIV 50mV
TIM 2ms
RF signal
(monaural sound)
FF IN terminal
PCB-SIGNAL(COMPONENT SIDE)
[Multi Channel Sound Circuit]
4.
Filter
Measuring
instrument
Test point
EXT trigger
Measurement
range
Input signal
Input terminal
12 eTPM2
RG § JICsE1
Symptom when
* This adjustment must follow adjustment 2 (Stereo VCO).
1. Supply an RF signal (monaural sound 400Hz 100%MOD).
2. Observe the waveform at TPM2 (pin @ of connector RG).
3. Press the "MENU" button on a remote hand unit.
4. Press the buttons "2", "3", "5" and "7" in that order.
(The screen will change to the circuit adjustment mode.)
§. Set the function to "MCS". ("AUDIO" button)
6. Select item "2 INP". "VIDEO" button)
7. Set the data so the amplitude of the waveform is 1.41+0.03Vp-p. ('ADJUST"
button)
8. Write the data into memory. (Press "ENTER")
9. Terminate the circuit adjustment mode. (Press "MENU" twice)
Note: Adjustment 4 (Filter) must be performed immediately after this adjustment.
Adjustment purpose _ Filter for the pilot signal.
Poor S/N ratio of signal in STEREO and SAP modes.
incorrectly adjusted
Oscilloscope
TPM2
DIV 10mV
TIM 2ms
RF signal
(stereo sound)
RF IN terminal
PCB-SIGNAL(COMPONENT SIDE)
TU101
12 eTPM2
RG 5 __]Icse1
* This adjustment must follow adjustment 3 (input Level).
1. Supply an RF signal (Stereo Pilot signal but no sound signal).
2. Observe the waveform at TPM2 (pin @ of connector RG).
3. Press the "MENU" button on a remote hand unit.
4. Press the buttons "2", "3", "5" and "7" in that order.
(The screen will change to the circuit adjustment mode.)
5. Set the function to "MCS". ("AUDIO" button)
6. Select item "3 FIL". "VIDEO" button)
7. Set the data for minimum amplitude of the waveform.("ADJUST" button)
Decrease the data from 63, and set the data to the value where the first
minimum amplitude is obtained.
8. Write the data into memory. (Press "ENTER")
9. Terminate the circuit adjustment mode. (Press "MENU" twice)
Note: Adjustment 5 (Separation) must be performed immediately after this
adjustment.
99
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