Sony sasi FE-2
Moderátor: Moderátoři
Proto je třeba se zaměřit na samotný zdroj a měření důležitých napětí, o kterých jsem psal výše. 
p.s. Postupoval bych podle tohoto návodu (diskuse na eservice):
Troubleshooting Tips (ref. Figure 3-3)
NOTE: Follow previously discussed “IC6501 Startup Sequence”. The five steps are in order of occurrence.
NOTE: Use HOT GRND when making measurements on primary side of T6502. This includes all
measurements on IC6501.
Symptom: Unit goes into protection mode, LED flashes four times.
Check: This indicates either a Vertical deflection or power supply problem.
1) Check power supply secondary outputs.
· If voltages are present and at proper the level, then the problem is in the Vertical deflection drive
circuit.
· If the secondary voltages are low or missing, then the problem is in the power supply.
2) The power supply can be safely tested by unloading the +135v line. Unsolder R5013. This will unload
the +135V line of the power supply, but still send necessary feedback to IC6501 for proper power supply
operation.
3) If the power supply outputs proper secondary voltages after unsoldering R5013, suspect a shorted +135V
line
4) If the unit still goes into protection mode after unsoldering R5013, check the following items:
· D6538 (5V Zener) for shorted condition.
· Check IC6505 (B+ OVP) for proper operation.
· IC6501/pin 15 (this is midpoint for output MOSFETS Q6507 and Q6506). A 275Vpp, 85KHz
square-wave should be present. If the waveform pulses four times and stops, check the next
Item.
· IC6501 Feedback circuit. The amount of current feedback can be determined by monitoring the
voltage drop across R6525. The minimum current feedback is 80uA, which is a minimum voltage
drop of 37.6mV. In normal operation, this voltage drop is approximately 223mV. If the voltage
drop is below 37.6mV, suspect components in the feedback path e.g. PH6502 and IC6503.
Reference Figure 3-3 for proper voltages at these components.
· If no waveform is present when the unit is turned ON, then check IC6501/pins 1 and 18 for proper
voltages (reference “IC6501 Startup Sequence” above).
If these voltages check OK, check IC6501/pin 8 for proper voltage of 24V. This is the voltage
used to power IC6501 after initial startup.
If 18V is present at IC6501/pin8, check IC6501/pin 10 for 10.2V. This voltage is developed using
the 18Vs and a voltage regulator circuit inside IC6501. If 10.2V is missing, suspect a defective
IC6501. Also check voltage at IC6501/pin 14 (Use battery powered DVM for this measurement
and use IC6501/pin 15 (VS) as ground ref.). The voltage at IC6501/pin 14 should be 10V. If the
voltage measured at IC6501/pin 14 is incorrect, check D618.
· If all the above measurements check OK, suspect a defective IC6501.
p.s. Postupoval bych podle tohoto návodu (diskuse na eservice):
Troubleshooting Tips (ref. Figure 3-3)
NOTE: Follow previously discussed “IC6501 Startup Sequence”. The five steps are in order of occurrence.
NOTE: Use HOT GRND when making measurements on primary side of T6502. This includes all
measurements on IC6501.
Symptom: Unit goes into protection mode, LED flashes four times.
Check: This indicates either a Vertical deflection or power supply problem.
1) Check power supply secondary outputs.
· If voltages are present and at proper the level, then the problem is in the Vertical deflection drive
circuit.
· If the secondary voltages are low or missing, then the problem is in the power supply.
2) The power supply can be safely tested by unloading the +135v line. Unsolder R5013. This will unload
the +135V line of the power supply, but still send necessary feedback to IC6501 for proper power supply
operation.
3) If the power supply outputs proper secondary voltages after unsoldering R5013, suspect a shorted +135V
line
4) If the unit still goes into protection mode after unsoldering R5013, check the following items:
· D6538 (5V Zener) for shorted condition.
· Check IC6505 (B+ OVP) for proper operation.
· IC6501/pin 15 (this is midpoint for output MOSFETS Q6507 and Q6506). A 275Vpp, 85KHz
square-wave should be present. If the waveform pulses four times and stops, check the next
Item.
· IC6501 Feedback circuit. The amount of current feedback can be determined by monitoring the
voltage drop across R6525. The minimum current feedback is 80uA, which is a minimum voltage
drop of 37.6mV. In normal operation, this voltage drop is approximately 223mV. If the voltage
drop is below 37.6mV, suspect components in the feedback path e.g. PH6502 and IC6503.
Reference Figure 3-3 for proper voltages at these components.
· If no waveform is present when the unit is turned ON, then check IC6501/pins 1 and 18 for proper
voltages (reference “IC6501 Startup Sequence” above).
If these voltages check OK, check IC6501/pin 8 for proper voltage of 24V. This is the voltage
used to power IC6501 after initial startup.
If 18V is present at IC6501/pin8, check IC6501/pin 10 for 10.2V. This voltage is developed using
the 18Vs and a voltage regulator circuit inside IC6501. If 10.2V is missing, suspect a defective
IC6501. Also check voltage at IC6501/pin 14 (Use battery powered DVM for this measurement
and use IC6501/pin 15 (VS) as ground ref.). The voltage at IC6501/pin 14 should be 10V. If the
voltage measured at IC6501/pin 14 is incorrect, check D618.
· If all the above measurements check OK, suspect a defective IC6501.
Tak páni.Vsetko som premeral ako je tu v navode.Napätia na strart Io su.samozrejme ,že ostatne napätia nič.Vzbral som IO premeral vsetkz suciatkz vymenil aj opto,ale nic TV -zdroj nezacne nabiehat.So starym IO to nabehlo aspon raz s tymto novym ani raz - tak neviem.original IO do zdroja SONY neviem zohnat tento som objedla v AVELMAKU no tam je aj ponuka,ze original SONY,ale ten nemali.Moze byt aj v tom chyba?Uz fakt neviem.
Zatajuješ nám, jaká napětí jsi naměřil. Ale shrnul bych to takto:
Pokud je po zapnutí relé na pinu 18 napětí cca +280V, na pinu 1 napětí >+1,3V <+8V a nulová napětí na pinu 5,9 a 11, pak by na osciloskopu připojeném k pinu 16 nebo 12 mělo být alespoň několik startovacích impulzů s kmitočtem cca 200kHz. To ovšem za předpokladu, že součástky oscilátoru R636,C636(na pinu 3 a 4) a zpožďovací kondenzátor C607(pin6) mají správné hodnoty. Pokud za těchto podmínek impulzy chybí, je IO vadný.
Otázkou by pak bylo, proč.
Pokud je po zapnutí relé na pinu 18 napětí cca +280V, na pinu 1 napětí >+1,3V <+8V a nulová napětí na pinu 5,9 a 11, pak by na osciloskopu připojeném k pinu 16 nebo 12 mělo být alespoň několik startovacích impulzů s kmitočtem cca 200kHz. To ovšem za předpokladu, že součástky oscilátoru R636,C636(na pinu 3 a 4) a zpožďovací kondenzátor C607(pin6) mají správné hodnoty. Pokud za těchto podmínek impulzy chybí, je IO vadný.
Otázkou by pak bylo, proč.
