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OK?..manual is complet and helpfull... for repairing such a old and rare boombox like JVC PCM it is necessary...
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Super Anleitung. Ordentliche Auflösung. Das ganze noch in Deutsch wäre zu schön. Alle Datenblätter sind sauber Kopiert und alle Leitungswege sind sauber ausgeführt
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Thanks God for the internet and thanks for the service like this - proffessional solution on time.
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About the service it's very fast and reliable. About the manual the quality is high enough to read even the tiniest details on the wiring diagrams so you can't ask much more than that, let it alone for a manual of a product from 20 years ago. Thank you, very satisfied.
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The downloaded quality was as good as the orignial
PC-UM10M
THE PC DISPLAY DOES NOT WORK. (DIGITAL DVI)
Does the display work normally with analog inputs? 4 (Yes) Is 14Pin of CN2 at DC+5V? 4 (Yes) Are the signal levels of 1PIN, 2PIN, 9PIN, 10PIN, 17PIN, 18PIN, 23PIN, and 24PIN of CN2 changed? 4 (No) Are the waveforms at 1PIN and 2PIN of IC7 changed normally when the resolution is changed? 4 (Yes) Check IC7and IC8. 3 (No) Check IC7 peripheral circuits. 3 (Yes) IIC8 abnormality 3 (No) Check CN2 and the signal source. 3 (No) First, check with analog inputs.
THE FIRMWARE CANNOT BE UPGRADED
Connected to the analog input CN1? 4 (Yes) Is SW1 set to 1, 2 side? (CN1 side when viewed from you) 4 (Yes) Is 2PIN of Q16 at the GND level? 4 (Yes) Are 1PIN and 13PIN of IC6 changed normally? 4 (Yes) Are signal waveforms provided at 12PIN - 19PIN of IC18? 4 (Yes) Check 31, 32, 33, 35, and 44PIN of IC15. (If there is no abnormality, IC15 or IC19 is defective.) 3 (No) ICheck IC18 and IC19 peripheral circuits. 3 (No) Check IC6 peripheral circuits. 3 (No) Check SW1 and R258. 3 (No) Set SW1 to 1, 2 side (CN1 side when viewed from you). 3 (No) Connect the jig fro rewriting the firmware to the analog input CN1.
AUDIO DOES NOT SOUND
Is the audio cable connected to CN2 of the AUDIO PWB? 4 (Yes) Is 1PIN of CN1 at DC+12V? 4 (Yes) Is the voltage at 2PIN of CN1 changed by varying the sound volume? 4 (Yes) Are 3PIN and 4PIN of CN1 changed to the GND level when any display is made? 4 (Yes) Is 5PIN of CN1 at the GND level? 4 (Yes) Replace the AUDIO PWB. 3 (No) Check CN1, the cable connected to CN1, and CN3 of the main PWB. 3 (No) Check IC20 and its peripheral circuits. 3 (No) Check IC15 and its peripheral circuits. 3 (No) Check Q15 of the main PWB and the AU12V power line. 3 (No) Connect the audio cable to CN2 of the AUDIO PWB.
LL-T1815 TROUBLE SHOOTING
4�5
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