Jvc HMHDS 1 U Service Manual

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1 Hard Disk Drive (HDD) 1. Hard Disk Drive (HDD) Handling Precautions The HDD is a precision device for use in reading and writing a large amount of data on or from a disk rotating at a high speed. If it is not handled carefully, either abnormal operation may result or it may not be possible to read data. The HDD is sensitive to the following items and special care is required in safeguarding against them when handling an HDD. Also take care in handling a set incorporating an HDD. 1. Vibrations and impacts 2. Static electricity 3. Rough handling 1.1 Handling in transport, etc. sBe sure to place the HDD in the manufacturer's specified package carton before transport. sWhen receiving a package containing an HDD, check that the pack- age carton is not damaged (such as having holes in the carton, crushed corners, etc.). sDo not impact the packaging carton when loading or unloading it. sIt is not permitted to use the inner package carton only for transport- ing an HDD. sDo not stack package cartons one upon another. 1.2 Handling an HDD in the stand-alone status sWhen handling an HDD on a hard workbench, place an antistatic mat (rubber sheet) or similar object on the hard surface (to prevent any impacts occurring between the HDD and bench). sDo not stack the HDDs one upon another. sDo not knock an HDD with a hard object (such as a screwdriver). sDo not place an HDD on its side panel without using a support (do not place an HDD in an unstable position). 1.3 Handling the installation of an HDD sPlace antistatic mats or similar sheets on all of the surfaces on which work is conducted or when the HDD is transported. sDo not permit the HDD to knock against the set's brackets. sWhen screwing the brackets, be careful not to knock the HDD. When using a power screwdriver, use a low- shock model and arrange the tightening torque properly. sWhen mounting an HDD in a HDD/VHS DUAL RECORDER, take care not to apply excessive force to the brackets. HDD Do not throw or drop packages. Be sure to package and transport the HDDs correctly.

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2 2. In Case of an HDD Failure When a HDD/VHS DUAL RECORDER AC cord is plugged into a power outlet, the boot loader is read from the IC8204 (8M FLASH ROM), which activates the HDD and reads the system files in the HDD before getting ready for operation. In consequence, the computer cannot be turned on if the HDD fails. In case a failure of the HDD is in doubt, use the following procedure to switch the main power of the set ON using the VHS section alone, by bypassing the HDD operation check. (1) With the HDD/VHS DUAL RECORDER in the remote control standby status, transmit code 7b from the remote jig for more than 2 seconds. (2) The REC LINK button on the computer blinks, indicating that the power supply can be switched ON. (3) When the code 7B is transmitted again from the remote jig, the button stops blinking and its function is canceled. Initial mode Data codeCustom code 43: A code 52: B code HDD OK HM-HDS1POWER BS DIGIATL CHANNEL Blinks. ASIC_IF MPEG_DEC 40GB HDD IC8201 IC8001 8M FLASH OPEN IC8204 IC8205 IC8206 IC8207 DVD 0_:7_ VIO 0:7 IDE 40PIN AD 0:31 AD 4:11 AD 12:19 LADO 4:11 LADO 12:19 AD 0:15 AD 16:31AD 4:19 VHS SYSCON HOSTDATAKBUS_IN KBUS_OUT Address Latch Address Latch E:08 is displayed in the case of a communication error with the VHS SYSCONFirmware HDD driver Navigation information boot loader VHS Navi back up