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JVC menu
CN104
DV MAIN PWB
<JLIP>
Connector cable
PTU94018A
VCO DC
FS PLL
HID
A GND
ENV OUT
PC cable
QAM0099-001
Adjustment software
RS-232C port
Personal computer
Switch
Drum replacement
2.12.5
Linearity
Adjustment
3.6.7
Play Switching
Point Adjustment
3.6.8-3
Error Rate (PB
EQ) Adjustment
3.6.8-1
REC Current
Adjustment
Adjustment Item
Servicing
Note 1
Required
Note 1
Required
Not required
Not required
Not required
Not required
Not required
Not required
Required
Required
Check
Check
Required
Required
Required
Required
Not required
Not required
Required
Required
IC501 replacement
(PB EQ on DV Main
board)
IC901 replacement
(PRE/REC amp on
P/R & MDA board)
DV Main board
replacement
Note 2
Required
2.12.2 Before Adjustments
Table 2-12-1 shows the adjustments to be enforced after servicing.
Note 1 : Check is required after servicing or re-
placement related to the drum, TU/
SUP guide rails or tension.
Note 2 : After having replaced the DV Main
board, be sure to write the original
data in the EEPROM (IC103) of the
new board. If the original data cannot
be written due to communication fail-
ure, mount the original EEPROM to
the new board.
The following data are written in the
EEPROM (IC103) on the DV MAIN
board.
• EVR adjustment value data
• Hour meter
• Warning history
• IEEE1394 ID code
Table 2-12-1
Fig. 2-12-2 Adjustment Setup
2.12.3 Adjustment Setup
As shown in Fig.2-12-2 below, connect the connector cable to
CN104 on the DV MAIN board and then connect it to the PC
cable.
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