JVC GRDF550US
Manual de Servicio

Jig connector diagrams

4.3

MECHANISM COMPATIBILITY ADJUSTMENT

4.3.1 Tape pattern adjustment

JIG CONNECTOR CABLE (YTU93106C)
MAIN CN113 EXMOD_1 1 SYS_TMS 21 SYS_TCK 2 SYS_TDI 22 SYS_TRSTL 3 SYS_TDO 23 SYS_RSTL AL_3VSYS IF_TX JLIP_TX JLIP_RX TXD2 RXD2 NC 4 24 5 25 6 7 26 27 6 7 8 9 JLIP_RX RXD2 I_MTR NC

NOTE: Prior to the adjustment, remove the COVER (ADJ). (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). For actual adjustment, first, turn both the GUIDE ROLLERS (SUP and TU) to tightening direction (clockwise) in order to misalign the waveform once. Next, turn the GUIDE ROLLERS to returning direction (counterclockwise), then stop turning at the point where the waveform becomes flat. Turn only the GUIDE ROLLER (SUP) further more, then stop turning at the point where the waveform starts changing. (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.

NOTE:
The JIG connector board uses 30 pins from among 40 pins of CN113 on the MAIN board. Pins 1 to 5, 21 to 24 and 34 of CN113 on the MAIN board are not used
JIG CONN. BOARD (PIN NO.)

I_MTR 8 NC 28 NC 9 ENV_OUT 29 MAIN_VCO 10 ATFI 30 HID 11 DISCRI FS_PLL HST MON_B NC MON_G GND GND V_OUT NC CVF_B CVF_R CVF_G GND NC NC DSC_DBG KENTO MVD 31 12 32 13 33 14 34 15 35 16 36 17 37 18 38 19 39 20 40

10 MAIN_VCO 11 HID 12 FS_PLL 13 MON_B 14 MON_G GND 15 16 NC 17 18 19 20 25 26 27 28 29 30 31 32 33 35 36 37 38 39 40 CVF_R GND NC KENTO JLIP_TX TXD2 NC NC ENV_OUT ATFI DISCRI HST NC V_OUT CVF_B CVF_G NC DSC_DBG MVD

ENV_OUT

Fig.4-2-2

HID

Fig.4-3-1

Flatten the waveform. Misalignment of guide roller height on the supply side Misalignment of guide roller height on the take-up side

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". (No.YF093)1-19