Panasonic Repair Tips

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Make	Model	Symptom	Problem
PANASONIC	Z3	Stuck in stby ic1104 5v rail low at 4v	Q804 or zener diode d810
PANASONIC	Z3	Set buzzes from psu but dead	If pin 15 ic101 high ( x-ray protection ) try shorting to chassis , if set ok check q502 and r560 270k
PANASONIC	Z3	Reduced height poor linearity	C404 ( 4u7 ) 50v
PANASONIC	Z3	Powers up then goes dead	Remove q451 power up on variac , if field collapse check d4539 on odd occasions flashovers in tube cause diode to fail
PANASONIC	Z3	Poor field lin top expanded bottom compressed	C458 may be 10uf 50v or 4u7 50v
PANASONIC	Z3	Picture size flutters and set goes to stby int.	Str50103a us
PANASONIC	Z3	No tuning	C17 0.01uf sc
PANASONIC	Z3	No start up. if pin 15 ic101 shorted to chassis se	Check feeds to q502
PANASONIC	Z3	No picture - sound ok	Check for dry joints on crt socket
PANASONIC	Z3	No pic	D453 22v zener in field cct s/c - also suspect loptx
PANASONIC	Z3	No colour	C616 on ic101 pin 29 10nf 50v ceramic
PANASONIC	Z3	No col - pink screen with hanover bars	C601 10nf disc ceramic cap in pal dl leaky
PANASONIC	Z3	Int no picture	Line driver tx dry
PANASONIC	Z3	Int loss of pic	Check for cracks in print around t531 line drive tx
PANASONIC	Z3	Int dead when off ic1101 reset pin 6 low	Check q804 5v reg d810 5v zen & c1122 ( 0.01uf )
PANASONIC	Z3	If brightness turned up set trips off	R316 47k oc
PANASONIC	Z3	Fails to start	R802 ( 330k ) bias to chopper chip o/c
PANASONIC	Z3	Dead with groaning sound	100v ht present, no line drive, prot tr q451 operating. when removed field coll . no 25v to field chip - r467 1r8 o/c
PANASONIC	Z3	Dead - str50103 s/c	Replaced also prot diode and positor
PANASONIC	Z3	Dead - st/by only	S/c on ht line - d816 r2g overvolts diode - replace str50103a