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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
5.2
Check points for each error
5.2.1 Spindle start error (1) Defective spindle motor � Are there several ohms resistance between each pin of CN201 "2-3","3-4","2-4"? (The power supply is turned off and measured.) (2) Defective spindle motor driver (IC201) � Has motor drive voltage of a sine wave or a rectangular wave gone out to each terminal(UOUT,VOUT,WOUT) of CN201"2,3,4" and IC201"19,18,17"? � Is FG pulse output from the terminal of IC201"41"(FG) according to the rotation of the motor? (3) Has the control signal come from the microcomputer? � Is it "H" while the terminal of IC201"48"(MUTE1) is operating? � Is the control signal input to the terminal of IC201"25"(SPDRV)? � Is the SVREF voltage input to the terminal of IC201"26"(VREF)? (4) Is the FG signal input to the servo IC? � Is FG pulse input to the terminal of IC301"175"(FGIN) according to the rotation of the motor? 5.2.2 Disc Detection, Distinction error (no disc, no RFENV) � Laser is defective. � Front End Processor is defective (IC101). � APC circuit is defective. --- Q101, Q102. � Pattern is defective. --- Lines for CN101 - All patterns which relate to pick-up and patterns between IC101 � IC101 --- For signal from IC101 to IC301, is signal output from IC101 "40" (FE)? 5.2.3 Traverse movement NG (1) Defective traverse driver � Has the voltage come between terminal of CN201 "7" and "8" ? (2) Defective BTL driver (IC201) � Has the motor drive voltage gone out to IC201"11" or "14"? (3) Has the control signal come from the microcomputer? � TRSDRV Is the signal input? (IC301 "161") (4) TRVSW is the signal input to microcomputer? (IC301 "177") 5.2.4 Focus ON NG � Is FE output ? --- Pattern, IC101 � Is FODRV signal sent ? (R275) --- Pattern, IC301 "160" � Is driving voltage sent ?IC101 "3", "4" --- If NG, pattern, driver, mechanical unit . � Mechanical unit is defective. 5.2.5 Tracking ON NG � When the tracking loop cannot be drawn in, TE shape of waves does not settle. � Mechanical unit is defective. Because the self adjustment cannot be normally adjusted, the thing which cannot be normally drawn in is thought. � Periphery of driver (IC201) Relative component or IC it self is defective. � Microcomputer (IC301) When improperly adjusted due to defective IC.
(No.YD053)1-19
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