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[. . . ] 5 SERVICE POSITION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 VCR TEST TAPE INTERCHANGEABILITY TABLE . . . . . . . . . . . . . . . 7 ELECTRICAL MAIN PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 ~ 10 TRANSISTOR ILLUSTRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] YES Is the I2C Bus siganl applied NO to the IC301 Pins 23, 24?YES Does the normal RF signal appear at the IC301 Pin 74?NO Is the V. H. S/W signal applied NO to the IC301 Pin 11 ?YES Is V. H. S/W "H" about 3. 4V at the IC301 Pin 11?(Check R304, R340) Check the System Circuit. (IC501 Pin 105) Refer to 'SYSTEM I2C BUS CHECK Trouble Shooting'. (Power Circuit)
Clean the Drum.
Replace the IC301.
Does the Y(Luminance) RF signal appear at the IC301 Pin 17?YES Is the Y(Luminance) Video waveform showed up at theIC301 Pin 41?YES Replace the IC301.
NO
Check the path of the Y(Luminance) RF signal. (Check the Q301)
YES
NO
Check the path of the Y(Luminance) RF signal. (Check Q302, Q303)
YES
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ELECTRICAL TROUBLESHOOTING -9/17 3. YES Does the RF signal appear at the IC301 Pin 12?
Check EE Mode.
NO
Check the line of the 5. 2V Line. (Power Circuit)
NO
Check PB Mode.
NO
Is the REC "H" signal (about 4V) applied to the IC 301 Pin 30?YES
NO
Check the System of REC "H". (the IC501 Pin 47 / the D301)
YES
Check REC Luminance Pass & Color Pass.
YES
Replace the IC301.
Does the REC RF signal appear at the IC301 Pin 90?YES Check the Drum & Drum Connector
NO
Check the circuit of the IC301 Pin 90, 92, 94.
YES
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ELECTRICAL TROUBLESHOOTING -13/17 5. Tuner/IF circuit (1) No picture on the TV screen
No picture on the TV screen YES Does the Video signal at the TU701 Pin24?YES NO Is +30VT applied to TU701 Pin 16?YES Does the Clock signal appear at TU701 Pin 11?YES Does the data signal appear at TU701 Pin 12?YES NO Check the lIC Data signal of µ-com Pin 60. NO Check the lIC Clock signal of µ-com Pin 59. NO
Check 33VT line.
Replace Tuner
Does Sync appear at IC501 Pin39? [. . . ] If the dirt on the head is too stubborn to remove by tape, use the cleaning patch. Coat the cleaning patch with Isopropyl Alcohol. Touch the cleaning patch to the head tip and gently turn the head(rotating cylinder) right and left. (Do not move the cleaning patch vertically. [. . . ]
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