Compatibility And Error Rate Adjustments; Preparation; Adjustment - JVC SR-VS20E Service Manual

2.18 COMPATIBILITY AND ERROR RATE ADJUSTMENTS

2.18.1 Preparation

Before disassembly and adjustment, back up the data stored
in the EEPROM (IC1007 on the DV MAIN board) using the
Service Support System Software (SSS software).
Table 2-18-1 shows the important service points for the com-
patibility and error rate adjustments.
Adjustment Item
Linearity

Adjustment

Service Point
Drum replacement Required
Note 1
Transport part Required
replacement Note 1
Transport part Required
(drum) repair Note 1
IC5001
(PRE/REC amp on Not
PRE/REC MDA
board) replacement
IC2001
(PB. EQ on DV Not
MAIN board)
replacement
DV MAIN board
replacement Not
Note 2
Table 2-18-1
Note 1 :
• The linearity adjustment is required only after servicing or
replacing the drum or the take up/supply guide rail.
Note 2 :
• After replacing the DV MAIN board, write the original data in
the EEPROM of the new board. If write communication is not
possible, mount the original EEPROM on the new board.
When adjustments of more than one item are required, use
the following order for the adjustments.
2.18.3 Linearity Adjustment
∫
2.18.4 PB Switching Point Adjustment
∫
2.18.5 Error Rate Adjustment
2.18.2 Adjustment
The actual adjustment requires the following preparation.
1. Tools required for adjustment
Alignment tape Guide driver
US : MC-1 YTU94085
PAL : MC-2
SSS software PC cable
PTU94016-3 US : QAM0099-002
PAL : QAM0099-005
Fig. 2-18-1
2-40
PB Switching Error Rate
Point Adjustment Adjustmenmt
Required Required
Not Check
Not Check
Not Check
Not Required
Required Required
Jig connector cable
PTU94018B
Jig RCU
PTU94023B
2. Procedure
1. Take out the 7 screws (1 to 7), then remove the top cover.
(See Fig. COM1 on page 1-3 of section 1.5.)
2. Connect the jig connector cable to CN1101 on the DV
MAIN board.
Jig Connector Cable
PTU94018B
<Note> : Switch setting of the
Jig connector cable
Switch OFF
(UP)
Fig. 2-18-2
3. Setup for computer adjustment
– Setup by extending the jig connector –
When performing the adjustment by the SSS software, set the VCR
to external communication mode by transmitting the code "6C" from
the Jig RCU.
Jig RCU
[PTU94023B]
INITIAL MODE
DATA CODE
CUSTOM CODE
[Data transmitting method]
43: A CODE
Depress the " " ( 3 ) button 53: B CODE
after the data code is set.
Switch
<JLIP>
Fig. 2-18-3
Service Support Software
RS-232C Port
JVC
MENU
PC Cable
QAM0099-002
Personal Computer
<Note> : Switch setting of the
Jig connector cable
Switch OFF
(UP)