Genius 2093, ISO XFR-75W, 1493, 2793, 3693, 1793, 1993 Retrace, Lines, Monitor, Shuts, Down, Power

Problem		Tests																			Probable Solution
Retrace	1.	Turn down M. Gain to minimum.
		Measure voltage, auto bias IC												927					If any of the voltages are
Lines .
		pins 2, 4, & 6 for 5.5V to 6.5V.																	not in the listed voltage
		Also measure voltage, pins 3, 5,																	range, replace IC																		.
																														927
		& 7 for 1.1V to 2.7V
	2.	Measure voltage, LM324																If old style C-Film (no solder
										920								connection) & pin 5 voltage is 4.8V
		pin 5. Should be less than 4.5V.																add a 7.15K resistor pins 8 to 11.
																		Otherwise replace C-Film.
	3.	Check video gain line (J										)						If either V. or H. blanking is
									215
		scope sync on Vs				, .2mS/cm,												missing, go to that circuit for
			215
		and verify V. & H. blanking.																further tests.
Problem		Tests																			Probable Solution
	1.	If screen turns bright & shutdown.																Check voltage across cap.																									5-10V
Monitor																																			846
Shuts	2.	If shutdown right after power up.																Check V+, Hfo, & EHT at power up.
Down.	3.
		Disable fault; clip					to GND.											If solution, check fault circuit.
				019
	4.	Disable shutdown; clip V- to													.			Measure EHT, should be less than 27KV.
												109
Problem		Tests																			Probable Solution
	1.	With power applied, check voltage																If 0V to 100V, ohm out fuse																												&
No																																							146
		ground to (V-) anode of diode														.		inrush current limiter														25Ω								to .5Ω .
												156																159
Power.
	2.	Measure voltage, V+ line is 0V &																Ohm out crowbar zener diode																															.
																																												181
		PS chirps																Also ohm out H. output Xsr																													.
																																							433
	3.	If fuse is blown.																If the zener is shorted and the fuse
																		is blown, replace fuse												146						,
		Ohm out 160V crowbar zener											181				.	zener		181			, power FET									136							,
																		and the C5184 IC													.
																										115
	4.	If the power supply chirps and																Ohm out the 17V line; V- to anode
		high voltage can be heard.																of	141		,	141		,	149		,		139					,		132									,
																		J-Film pins 8-14 & IC													115							pin 15.
	5.	If the power supply chirps, check
		for shorted secondary voltages by;																First, ohm out diodes;																				,										,
																															142									168
		Disconnect power to chassis.																																				,										.
																															169									181
		Apply external DC PS to 16V																If PS current less than .5A and 12V
		line at cathode of diode									.							line=11.5V to 12.5V, go to next test.
									169
		Apply second DC voltage to 24V																If PS current less than .3A, line OK.
		line at cathode of						.										Check base of H. output																433								for
					168
																		drive waveform. If OK connect 24V
		FBT Check at low voltage;																line to V+ line and check flyback
																		waveform at collector of																							.
																																	433
																		(Without H. deflection load,																							PS
																		chirps) If large and small pulses
																		observed, replace the FBT.

97