Procedure Of Compatibility And P.b. Eq; (Error Rate) Adjustments; Precautions; Adjustment Standard - JVC GR-DVF11U Service Manual

2.3 PROCEDURE OF COMPATIBILITY AND P.B. EQ.

(ERROR RATE) ADJUSTMENTS

2.3.1 Precautions

Prior to starting disassembling and adjusting work, be sure to
make a backup copy of the data stored in the EEPROM (IC1003
on the MAIN board) for the "EEPROM utility" of the SSS soft-
ware.
Table 2-3-1 shows important service points for adjustment of
P.B. EQ. (error rate).
Adjustment item
Linearity
adjustment
Service point
Replacement of Necessary
DRUM
Note 1
Replacement of parts of Necessary
tape transport system
Note 1
Repair of parts of tape Necessary
transport system
(DRUM) Note 1
Replacement of IC3501 Unnecessary
(SECOND board,
PRE/REC amp)
Replacement of MAIN Unnecessary
BOARD
Note 2
Table 2-3-1
Note 1: Linearity adjustment is needed only after replacement
of the drum or replacement/repair of the TU/SUP guide
rail.
Note 2: After replacement of the MAIN board, be sure to write
the original data on the EEPROM of the new MAIN
board. After data writing, adjust the camera section.
When the MAIN board is replaced for the reason of
communication failure, install the original EEPROM on
the new MAIN board.
If adjustment is needed for two or more items, proceed in ad-
justment of respective items in the following order.
2.3.3 Linearity adjustment
2.3.4 PB switching point adjustment
2.3.5 Head REC current adjustment
2.3.6 P.B. EQ. (error rate) adjustment (both in SP and LP)
Error rate
P.B. Switching Head Recording
(P.B. EQ).
Point Current
adjustment
adjustment adjustment
(SP/LP)
Necessary Necessary Necessary
Unnecessary Unnecessary Check
Unnecessary Unnecessary Check
Unnecessary Necessary Check
Necessary Necessary Necessary

2.3.2 Adjustment standard

Note : For details of the test instruments, tools and jigs re-
quired for adjustment, refer to pages 1-2, 1-3 and 2-1
of this manual.
1. Remove the cover (CC).
Note : Carefully remove the cover not to scratch the exterior
of the camera. Since the cover (CC) shall be restored
to the original position after adjustment, be very care-
ful not to soil its adhesive surface.
2. Open the monitor assembly. Remove two screws (1, 2)
and then remove the upper case (2).
3. Remove one screw (3) and then remove the cover (jig).
Pole base
assembly
1
(S4)
Upper
case (2)
2
(S4)
Guide roller
assembly
Fig. 2-3-1
3
(S5)
Cover
(jig)
Jig connecror
cable
CN105
(YTU93082C)
Cover
(CC)
2-17