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[Multi Channel Sound Circuit]
5. Separation
Test point
EXT trigger
Measurement
range
Input signal
Input terminal
Symptom when
Adjustment purpose
Adjust right and left separation.
Poor or no stereo separation.
incorrectly adjusted
Measuring
:
:
Oscilloscope
instrument
e
TPM2
DIV 10mV
TIM 2ms
RF signal
(stereo sound)
RF IN terminal
PCB-SIGNAL(COMPONENT SIDE)
12 eTPM2
na > __jIC3E1
[High Voitage Circuit]
6. High Voltage Control
Measuring
instrument
EXT trigger
Measurement
range
Input signal
Input terminal | VIDEO IN terminal
Symptom when
* This adjustment must follow adjustment 4 (Filter).
1. Supply an RF signal (L-CH only stereo sound 300Hz 30%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. Make sure that the data of "5 HSP" is "32".
7. Select item "4 LSP". ('VIDEO" button)
8. Set the data so that the amplitude of the waveform (300Hz) is minimum.
(""ADJUST" button)
9. Change the modulating signal to 3kHz.
10. Select item "S HSP". ("VIDEO" button)
11. Set the data so the amplitude of the waveform (8kHz) is minimum. ("ADJUST"
button)
12. Repeat the steps 7 to 8.
13. Write the data into memory. (Press "ENTER")
14. Terminate the circuit adjustment mode. (Press "MENU" twice)
Adjustment purpose
CRT anode voltage.
Too dark picture.
incorrectly adjusted
DC voltmeter
+lead : pin @ of connector DQ
- lead : pin @ of connector DQ
VIDEO signal
(monoscope)
PCB-MAIN (COMPONENT SIDE)
* This adjustment must follow adjustment 7 (CRT Cut Off, White).
1. Supply a VIDEO signal (monoscope).
2. Set the CONTRAST control to maximum and BRIGHTNESS conirol to center
position.
3. Observe the DC voltage between pins @ and @ of connector DQ.
(plus lead to pin @)
4. Press the "MENU" button on a remote hand unit.
5. Press the buttons "2", "3", "5" and "7" in that order.
(The screen will change to the circuit adjustment mode.)
6. Set the function to "HV". ("AUDIO" button)
(The screen will change to the black picture.)
7. Set the data so the DC voltmeter reads 0.150+0.005V. ("ADJUST" button)
8. Write the data into memory. (Press "ENTER")
9. Terminate the circuit adjustment mode. (Press "MENU" twice)
Pree
1° eae
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