Test Points - Mitsubishi Electric HD-4001 Service Manual

Measuring
Instrument
Test Point
Ext. Trigger
Measuring
Range
Input Signal
Input Terminal
[Video Circuit]
1. Main-Y Gain
Measuring
Oscilloscope
Instrument
Test Point TPMY
Ext. Trigger
------
Measuring
-------
Range
Input Signal
Color bars
Input Terminal
External Input
MODEL: HD-4001
Purpose:

TEST POINTS

Symptom:
TPSY
Purpose:
To set the main picture Y level
Symptom:
Incorrect analog source main picture brightness level.
1. Supply a Color Bars with 100% white signal to an External Input.
2. Connect a scope to TPY.
3. Enter the Alignment Mode (MENU-2-4-5-7)
4. Select the MMTX function (AUDIO button).
5. Select adjust item #14 YDRM (VIDEO button).
6. Set the data so the waveform at TPY is 0.7 Vp-p ±0.03 Vp-p (ADJUST buttons).
7. Press "ENTER" to save data.
8. Press "MENU" twice to exit the service mode.
TPSY
Page 18
TPY
PWB-SIGNAL (Partial)
TPY