JVC GR-D750UC Service Manual page 20

Jig connector diagrams
JIG CONNECTOR CABLE (YTU93106B)
MAIN CN102
MVD 20
V_OUT 10
- 19
- 9
- 18
CVF_G 8
COM_VF 17
GND 7
FS_PLL 16
GND 6
HID 15
ATFI 5
MAIN_VCO 14
ENV_OUT 4
IF_RX 13
IF_TX 3
AL_2.8VSYS 12
IRU 2
KENTO 11
KENTO2 1
ADDITIONAL WIRE
13. IF_TX
28. IF_RX
Fig.4-2-3
Conversion Connector
KENTO 30 11
AL_2.8VSYS 29 12
IF_RX 28 13
MAIN_VCO 27 14
HID 26 15
FS_PLL 25 16
COM_VF 24 17
- 23 18
- 22 19
MVD 21 20
20
19
18
17
16
Fig.4-2-4
1-20 (No.YF173)
JIG CONN. BOARD
(PIN NO.)
NC
30
AL_2.8VSYS
29
IF_RX
28
NC
27
HID
26
NC
25
NC
24
-
23
-
22
NC
21
NC
20
NC
19
NC
18
NC
17
NC
16
NC
15
NC
14
IF_TX
13
ENV_OUT
12
NC
11
GND
10
GND
9
CVF_G
8
-
7
NC
6
NC
5
NC
4
NC
3
NC
2
NC
1
1 15 KENTO2
2 14 IRU
3 13 IF_TX
4 12 ENV_OUT
5 11 ATFI
6 10 GND
7 9 GND
8 8 CVF_G
9 7 -
10 6 V_OUT
5
4
3
2
1
4.3 MECHANISM COMPATIBILITY ADJUSTMENT
4.3.1 Tape pattern adjustment
NOTE:
Prior to the adjustment, remove the CASS.COVER.
(1) Play back the compatibility adjustment tape.
(2) While triggering the HID, observe the waveform of
ENV_OUT.
(3) Set the manual tracking mode (ATF OFF).
(4) Confirm that the waveform is entirely parallel and straight,
and free from remarkable level-down, through the tracking
operation.
Make the confirmation as follows if necessary.
(5) If level-down is observed on the left hand side of the
waveform, straighten the level by turning the GUIDE
ROLLER (SUP).
If level-down is observed on the right hand side of the
waveform, straighten the
level by turning the GUIDE ROLLER (TU).
(6) After the adjustment, try the unloading motion once, and
confirm that the waveform is flat when the tape has been
played back again.
(7) Play back the self-recording.
(8) Confirm that the waveform is flat.
Misalignment of guide
roller height on the
supply side
Fig.4-3-1
ENV_OUT
HID
Fig.4-3-2
4.4 ELECTRICAL ADJUSTMENT
Electrical adjustment is performed by using a personal computer
and software for SERVICE SUPPORT SYSTEM. Read
README.TXT file to use the software properly.
As for the connection of cables, see "4.2 JIG CONNECTOR
CABLE CONNECTION".
Flatten the waveform.
Misalignment of guide roller
height on the take-up side