MODELS:
[High Voltage Circuit] | Purpose: | To set the CRTs anode voltages | |||||
3. High Voltage Control | Symptom: | Dark picture. | |||||
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Measuring | DC Voltmeter | 1. | Supply a Monoscope signal to a Video Input. | ||||
Instrument | |||||||
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Test Point | + Lead to DT #5 | 2. | Connect a DC Voltmeter to pins 4 and 5 of the DT connector. | ||||
- Lead to DT #4 |
| • Positive Lead to DT #5 | |||||
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Ext. Trigger |
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| • Negative Lead to DT #4 | ||||
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| 3. | Set Contrast to maximum, and Brightness to the center position. | ||
Measuring |
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| 4. | Enter the Service Mode and check that Item “7 BRTH” under the VCJ Function is | |||||
Range |
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| set at 31. |
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Input Signal | Monoscope |
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5. | Press Enter and Exit the Service Mode. | ||||||
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Input Terminal | Video Input | 6. | Enter the Convergence Mode and select the Conv. Misc Function. | ||||
7. | Select Item “1 HVOL” (screen goes black). | ||||||
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| 8. | Adjust “1 HVOL” for 0.15 ±0.01 V on the meter. | ||
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| 9. | Exit the Convergence Mode and verify that the meter reading does not exceed | ||
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| 0.85V. |
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Note: HV must be reset if E2RESET is activated.
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| CONVERGENCE MODE | |
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| Activate | |
SERVICE MODE | |||
| Misc. ……………….……"6" | ||
Activate …….. |
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| Coarse………………..…."5" | ||
Function …...………..AUDIO |
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| Fine ……………………..."4" | ||
Item No. ……….…….VIDEO |
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| Color (R,G B or DF)...AUDIO | ||
Adjust Data ….…….ADJUST |
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| Item No………….…..VIDEO | ||
Save Data …. ………ENTER |
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| Adjust/Move……….ADJUST | ||
Exit …………..MENU (twice) |
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| Cursor Toggle….…..ENTER | ||
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| Save & Exit…..MENU (twice) |
[Focus] |
| Purpose: | To improve edge focus |
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4. Dynamic Focus | Symptom: | Blurred picture at the edges of the screen. | |||||||
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Measuring | 1. Supply a Monoscope signal to the Video Input. | ||||||||
Instrument |
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Test Point | 2. Enter the Coarse Convergence Mode and select the DF Function. | ||||||||
3. Verify that the data values are set as indicated in the table below. | |||||||||
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Ext. Trigger | 4. Exit the Convergence Mode. |
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Measuring |
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Range |
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Input Signal | Monoscope |
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| CONVERGENCE MODE |
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| DF Function |
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| Activate |
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Input Terminal | Video Input |
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| Item | Abbrev. | Data |
| Misc. ……………….……"6" |
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| 0 | DFH | 200 |
| Coarse………………..…."5" |
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| 1 | DFV | 100 |
| Fine ……………………..."4" |
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| Color (R,G B or DF)...AUDIO |
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| Item No………….…..VIDEO |
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| Adjust/Move……….ADJUST |
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| Cursor Toggle….…..ENTER |
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| Save & Exit…..MENU (twice) |
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Page 29
