Important safety notice . . ... ... ... .... ... .T2o check purity . ... ... .... ... ... .. 21
Instructional flow chart for service mode 22
Safety precautions. ... ... ... .... ... . 2
Generalguidelines. ... ... ... ....S...ervi.ce2adjustments (electronic controls) . . . 24
Leakage current cold check... .... ... . 2
Leakage current hot check ... .... ... . 2Sub-Contrast adjustment.... ... ... .. 24
Sub-Brightness (BRIGH) .... ... ... .. 24
X-ray radiation . ... ... ... ... .... ... . 2Tint/Color adjustment .. .... ... ... .. 24
Horizontal oscillator disable circuit test . . 2
Tint/Color adjustment
Servicenotes ... .... ... ... ... ... .... ... .(5Norainbowpattern) .... ... ... .. 25
Color temperature adjustment
Leadless chip component
(B/W Tracking) . ... .... ... ... .. 25
(surface mount)... ... ... .... ... . 5Complete adjustment... .... ... ... .. 25
Component removal . . ... ... .... ... . 5
Horizontal centering (H-POS) ... ... .. 26
Chip component installatio....n . .... . 5Horizontal width adjustment (H-WIDTH) 26
How toreplaceFlatIC. ... ... .... ... . 5Horizontal trapezoid
Horizontal oscillator disable circuit . . . . . 6
adjustment(HTRAP) .... ... ... .. 26
Parallelogram adjustment (R524) . . . . . 26
East west PCC balance
adjustment(SIDE). . .... ... ... .. 26
Receiver featuretable ... ... ... ... .... ... Ve. 7rtical linearity adjustment (V-C) . . . . . 27
Vertical correction adjustment (V-S) . . . 27
Vertical size and vertical position
adjustment(VEAMP & VRAS) .. .. 27
PCCadjustment(PCC) . .... ... ... .. 27
Locationof controls (receiver) . . ... .... ... . 9Corner PCC adjustment
(TOPG, TOPSL, BTMG, BTMSL) . . 27
Quick reference control operation . . . . . . 9MTS circuit adjustments .... ... ... .. 28
Inputlevel adjustment(MTSIN) .. ... .. 28
Locationof controls (remote) ... ... .... ... 10
Stereo separation adjustment
(SEPAL & SEPAH) . .... ... ... .. 28
Clock adjustment (CLOCK) . . ... ... .. 28
Service adjustments
(mechanical controls) ... ... ... .. 28
Disassembly forservice . ... ... ... .... ... 11
Focus (partofT551) ... .... ... ... .. 28
Back cover.... ... ... ... ... .... ... 11
A-Board . . .... ... ... ... ... .... ... 11
L-Board . . .... ... ... ... ... .... ... 11
Speakers . .... ... ... ... ... .... ... 11
Audiosignalpathblock diagram . . ... ... .. 29
Keyboard push button assembly . . . . . . 11
Disassembly for CRT replacement . . . . 11Videosignal pathblock diagram . . ... ... .. 30
CRT replacement . ... ... ... .... ... 11
Description of connectors...... . . ... ... .. 31
Back coverremoval .. ... ... ... ... .... ... 13
Component identification ...... . . ... ... .. 33
Chassis service adjustment procedures . . . . 14
Partslist . . ... .... ... ... ... .... ... ... .. 36
140.0V B+ Voltage confirmation . . . . . . 14
Source voltagechart .. ... ... .... ... 14
High voltage check ... ... ... .... ... 14
Purity andconvergence procedure . .... ... 15
Schematics, voltages and waveforms
When the CRT or the yoke is replaced . 15
Vertical raster shift adjustment .... ... 15
Initial center static convergence . . . . . . 16A-Board schematic.. ... ... .... ... ... .. 50
Purity adjustment. . ... ... ... .... ...A-B1o6ard voltages ... ... ... .... ... ... .. 54
Finalconvergenceprocedure . .... ... 16
D-Boardschematic.. ... ... .... ... ... .. 56
Dynamic corvergence adjustment . . . . . 16D-Board voltages . . . . ..... . . . ....... .. 59
DY(YHC, YV, XV) adjustment . .... ... 16
YV Adjustment (VR1 forA-Board waveforms . ... ... .... ... ... .. 60
Horizontal dynamic convergence). . 16G-Board schematic . ... ... .... ... ... .. 62
YH Adjustment (VR2 for
vertical dynamic convergence) . . . . 17G-L-Board voltages . ... ... .... ... ... .. 65
XV AdjustmentL-Boardschematic .. ... ... .... ... ... .. 66
(precise adjustment) . . ... .... ... 17
A-Board pcb .... ... ... ... .... ... ... .. 68
Permalloy convergence corrector
strip(part No.0FMK014ZZ) ... ... 17D-Boardpcb.... ... ... ... .... ... ... .. 70
DAF adjustment... ... ... ... .... ...G1-7Board pcb.... ... ... ... .... ... ... .. 72
Servicemode (electronic controls). . .... ... 1L9-Boardpcb .... ... ... ... .... ... ... .. 74
Quick entry to service mode . . .... ... 19
To toggle between aging and
service modes. ... ... ... .... ... 19
Exiting the service mode . . ... .... ... 19
To check colors ... ... ... ... .... ... 19
Entering service mode
(open-back method) . ...... . . ... 19
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