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Purpose:
Measuring
Instrument
Test Point
Measuring
Range
Input Signal
Ext. Trigger
Input Terminal
Symptom:
Purpose
Measuring
Instrument
Test Point
Measuring
Range
Input Signal
Ext. Trigger
Input Terminal
Symptom:
MODELS: WS-55859 / WS-55909 / WS-65869 / WS-65909 / WS-73909
Oscilloscope
Connector ST pins 16&12
------
50mV/Div
RF Stereo
300 Hz modulation
RF Input
Check the input signal level to the MCS circuit
Distorted sound during a stereo broadcast.
1. Supply an RF MCS signal to the Ant A input, 300 Hz at 100% modulation
(25 kHz deviation) for right and left channels.
2. Connect the oscilloscope to connector ST pin 16 (Right Audio).
3. Enter the Adjustment Mode and select the Audio Function.
4. Verify that the Audio Function items are set to the data values given the
table below.
5. Set the data for Item 1 INP for 1.56 Vp-p ±0.06V.
6. Connect the oscilloscope to connector ST pin 12 (Left Audio).
7. Confirm that the left audio level at pin 12 of the ST connector is 1.56 Vp-p
±0.06V.
Note:
Adjustment 2 (Stereo Separation) must be performed after this adjustment)
[Audio Circuit]
1. MCS Input Level
Oscilloscope
Conector ST pin 16
------
10mV/Div
RF Stereo
RF Input
[Audio Circuit]
2. Separation
Check stereo separation
Poor stereo separation
Note:
This adjustment must follow Adjustment 1 (Input Level)
1. Supply a RF Stereo Signal (dual tone stereo) to the Ant. A input.
Left Channel = 300 Hz modulation
Right Channel = no modulation
2. Connect the oscilloscope to connector ST pin 16 (Right Audio).
3. Enter the Adjustment Mode and select the Audio Function.
4. Set the data for Item 3 WDE for minimum Right Audio signal.
5. Change the modulation frequency to 3kHz.
6. Adjust the data for Item 4 SPC for minimum Right Audio signal.
AUDIO Function
Item #
Abbrev.
Data
1
INP
8
3
WDE
3
4
SPC
3
CIRCUIT ADJUST MODE
Activate
.. MENU-0-1-5-7
Function
...
..AUDIO
Item No.
.
.VIDEO
Adjust Data
.
.ADJUST
Save Data
.
ENTER
Exit
..MENU (twice)
CIRCUIT ADJUST MODE
Activate
.. MENU-0-1-5-7
Function
...
..AUDIO
Item No.
.
.VIDEO
Adjust Data
.
.ADJUST
Save Data
.
ENTER
Exit
..MENU (twice)
Summary of Contents for WS-55859
Page 2: ......
Page 61: ...MODELS WS 55859 WS 55909 WS 65869 WS 65909 WS 73909 Page 61 STANDBY SUPPLIES REGULATOR ...
Page 62: ...MODELS WS 55859 WS 55909 WS 65869 WS 65909 WS 73909 Page 62 SWITCHED SUPPLIES REGULATOR ...
Page 63: ...MODELS WS 55859 WS 55909 WS 65869 WS 65909 WS 73909 Page 63 DM POWER SUPPLY ...
Page 64: ...MODELS WS 55859 WS 55909 WS 65869 WS 65909 WS 73909 Page 64 VIDEO COLOR A V SWITCH CIRCUIT ...
Page 65: ...MODELS WS 55859 WS 55909 WS 65869 WS 65909 WS 73909 Page 65 PCB SIGNAL Y C PATH ...
Page 66: ...MODELS WS 55859 WS 55909 WS 65869 WS 65909 WS 73909 Page 66 SYNC PATH ...
Page 67: ...MODELS WS 55859 WS 55909 WS 65869 WS 65909 WS 73909 Page 67 DEFLECTION CIRCUIT X RAY PROTECT ...
Page 68: ...MODELS WS 55859 WS 55909 WS 65869 WS 65909 WS 73909 Page 68 SOUND CIRCUIT ...
Page 69: ...MODELS WS 55859 WS 55909 WS 65869 WS 65909 WS 73909 Page 69 CONVERGENCE CIRCUIT ...
Page 70: ...MODELS WS 55859 WS 55909 WS 65869 WS 65909 WS 73909 Page 70 CONTROL CIRCUIT ...
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