PDF《GENERAL NOTES》

1 but G1-K SHORT lamp does not light with FUNCTION switch RESTORE position, follow STEP B-CLEAN?BALANCE 2. If G1-K Short lamp lights when function switch is in RESTORE position, press REMOVE SHORTS button and release. Lamp will no longer glow if short is removed. Several operations may be necessary. Wait about

10 seconds between operations. Repeat STEP

2 and STEP

3 after shorts are removed. B C CLEAN ? ? ? ? BALANCE 1. Select gun to be cleaned when: ? G1-K leakage is indicated in STEP

1 but G1-K SHORTS lamp does not glow in RESTORE position. ? Emission GOOD but too low to track with other guns. ? Emission BAD in LIFE test. 2. Set FUNCTION switch to RESTORE 3. Place REJUVENATE/CLEAN?BALANCE switch to CLEAN?BALANCE. Wait

20 seconds. 4. Push RESTORE button below meter for gun selected. Pointer will rise immediately. Hold button until pointer begins to fall. Release button when pointer falls to 0.2. NOTE: If pointer does not continue to fall observe the G1-K SHORTS lamp. If it glows remove shorts before proceeding. 5. Return to TEST. Wait for reading to stabilize. Repeat STEP

2 and STEP 3. 6. Repeat procedure if further improvement is required. If still unsuccessful proceed to STEP C-REJUVENATE. C- REJUVENATE 1. Select gun to be restored when: ?Emission is in BAD region. ?TRACKING CANNOT BE CORRECTED BY CLEAN?BALANCE 2. Set FUNCTION switch to REJUVENATE. 3. Place REJUVENATE/CLEAN?BALANCE switch to REJUVENATE. Wait

20 seconds. 4. Push RESTORE button directly under meter of lowest emission gun. Pointer will immediately rise. Hold button until pointer begins to fall. Release immediately when pointer reaches0.5 (bad area). Note: If pointer does not continue to fall, observe the G1-K SHORT lamp. If it glows, remove short before proceeding. 5. Return to TEST. Wait for readings to stabilize. Repeat STEP

2 and STEP 3. If emission is now GOOD but further improvement of any gun is required for TRACKING or LIFE TEST use, CLEAN?BALANCE. If emission is still BAD repeat Rejuvenate. -4- CONDENSED INSTRUCTIONS MODELS

470 AND

480 SIMPLIFIED TEST PROCEDURE Do not apply power to the CRT chassis at any time during the test of any CRT. Completely discharge High Voltage Anode supply of CRT before connecting it to the CRT tester STEP 1: Set-Up Set all controls fully counterclockwise. Find proper adapter and heater voltage in SET-UP chart. Select HTR RANGE. Plug in tube and power cord. Rotate FUNCTION switch to SET HEATER . Adjust HEATER control until meter reads voltage specified in SET- UP CHART. STEP 2: LEAKAGE Rotate FUNCTION switch to HTR-LEAKAGE. Meter reading anywhere in YELLOW area of meter scale is acceptable. Turn GUN SELECTOR to test all guns. Excessive H-K leakage cannot be repaired, use isolation transformer. Rotate FUNCTION SWITCH TO G1 LEAKAGE. Meter reading anywhere in YELLOW area of meter scale is acceptable. Turn GUN SELECTOR switch to test all guns. For excessive leakage proceed to RESTORE CA. STEP 3: SET G1 BIAS Rotate FUNCTION switch to SET- G1 voltage Set G1 Bias to 50V unless there is a * (asterisk) in SET- UP CHART (see General Notes). STEP 4: SET C CUTOFF Rotate FUNCTION switch in SET CUTOFF-VOLTAGE. Adjust each G2 control until meter rises ONE DIVISION. Use GUN SELECTOR switch and corresponding G2 control with color tubes. STEP 5: TEST Rotate FUNCTION switch to read EMISSION. Emission is okay if meter reads in GOOD region. Use GUN SELECTOR switch for other guns. If any gun reads BAD, proceed to RESTORE C C. Rotate FUNCTION switch to SET TRACKING. Use GUN SELECTOR switch to select highest reading gun. Adjust TRACKING control to make meter read at SET TRACKING mark on meter scale. Tracking is okay if other guns read in YELLOW area on meter scale. If tracking is BAD, proceed to RESTORE C B. CAUTION -5- RESTORING THE PICTURE TUBE RESTORE A- REMOVE SHORTS- Rotate FUNCTION switch to REMOVE SHORTS. 1. IF G1 Leakage in STEP 2- B reads full scale or higher. A. Set GUN SELECTOR to shorted gun. B. Press and hold pushbutton for