Pioneer DVR-520H-S Service Manual page 81

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• When "NG" is displayed at First screen (version information, etc)
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(*1) NG+ : Version of the tuner microcomputer too advanced
NG- : Version of the tuner microcomputer too old
1. When TUFL µ-com is MASK type
NG+ : Download the firmware.
NG- : Replace the TUFL µ-com or JCKB ASSY.
2. When TuFL µ-com is FLASH type
NG+ : Download the firmware.
NG- : Download the firmware.
(*2) NG : NG (improper drive)
Replace the correct Drive Assy.
(*3) NG+ : Version of the drive too advanced
NG- : Version of the drive too old
NG+ : Download the firmware.
NG- : Download the firmware.
(*4) NG : Serial No. of the drive not registered
Check the part No. and replace the correct Drive Assy.
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