Jvc BR S422 E Service Manual Part 2

Page 1

2.7 ADJUSTMENT OF TAPE TRANSPORT SYSTEM

Note: The tape transport system has been precisely adjusted at the factory before shipment. Check and adjustment are
required only after the parts of the tape transport system are replaced.

No. Item Adjustment and Check
1 Location of parts
SP. guide roller 'i'U. guide roller
1 i
Impedance
roller
\ i
\\ DA TU. guide pole
\ TU. guide arm
/
V
Fig. 2-7-1 Names of Tape gUides
2 SPiguide rolloer (1) Required tool:
TU. guide rolloer -Hexagon head key (l.27 mm)
OK N6 N6 (2) Slightly loosen the setscrew under the guide roller.
(3) Play an ordinary thin tape (more than E-240 tape).
{4) Adjust the height of the guide roller temporarily sothat the
tape smoothly runs.
(5] Tighten the setscrew.
; 0 O O i J After the temporary adjustment, check the FM waveform.
Setscrew : 1.27m
Fig. 2772 Height adjustment of SP. & TU. guide roller
3 TU, guide pole {1} Play an ordinary thin tape (more than E-24O tape),
OK N6 N6 [2)- Adjust the height of the take-up guide pole so that the tape
smoothly runs on the lower flange of the take-up guide pole.
\ \ \ (Lower edge alignment}
T i l [3} Check that the tape is not damaged at near the take-Lip
i j guide pole and the guide arm in the following modes several
l i times respectively
i i PLAYHS REV-~3FWD-48TlLL-rPLAY
ii I; [4i When there is any result unsatisfactory in the above step
.3 turn the take-up guide pole Within a quarter round to
. , . _ lower the height and repeat the check mentioned in the
Fig. 2-7-3 Height adjustment of TU. gUIde pole above step (3:.
(5)- This adjustment result must be checked again after the
A/C head adjustment (see 2.6.4) is completed.
(6) After the adjustment, apply screw sealant to the screw.
4 TU. guide arm (1) Required tool:
-Hexagon head Key (0.9 mm)
OK OK NG NG
Ti [3 : (2) Set to SREV mode an ordinary thin tape (more than E-240
1 i tape)
4 . l
i i i (3) Adjust the height of the TU. guide arm with set screw so
i i l j that the tape is not damaged at upper frange of the TU.
i: l:l : guide arm. (Upper edge alignment)
Fig, 2_7_4 Height adjustment of TU. guide arm \4) After the adjustment, apply screw sealant to the set screw

2-20

Page 2

2.8 TABLE OF SCREWS AND SLIT WASHERS USED IN THIS SET

Note: The numbers of screws and slit washers shown below respectively accord with numbers of them appearing in this

section.

(gold) ;® (gold) @ (silver) <4) (black) (5) (gold)
(9 TBmm E G) 5mm @ (Sm @ 8mm @ 18mm
PDM4165A (-Ma) SDSP26052 SPSPZOOSZ P0435878 (M26) P044621 (-VM2.6)
(6) (gold) ® (gold) (8) (gold) ® (gold) ® (goid)

T .\
@T @T 16m @%}m @?M (as? 1%
sospzewzz SDSP26062 DPSPZOOSZi sosrzeosz SDSPZOO4Z
a) (gold) ® (gold) ///
T /
G) 4% 15m
SDSPZGOAZ SDsrzoosz
\
® (I75 ® $5 © ¢5
\
(0.5 1 ms «1.35
1
¢3.1 am $11
POM30017-24(red) POM30017-26(red) 1 POM30017-2 (black)
i \

2»21

Page 14

Na Item Check point Adjustment Signal i Mode Check and Adjustment
5 REC TPBII R2963: Coior bari REG (1] Connect the osciiioscope to TPB
rocess i -HS
:utput level Y/C 443 (2] Perform recording In the S~VHS mode
, IN (3) Adiust R296 so that the Signai ievei is 0.5Vp-p.
I. CAMERA
ADAPTER?
H~rate
6 Carrier 8 TPiGEE R349C®I Color bar REC Nate: This adjustment needs the carrier checker
deviation (CAR RI) . S-VHS (PGJ05008-2).
i Y
REES)??? fl: 443 (1)Connect the carrier checker and an osmiioscope as
1 shown in the figure.
I CAMERA
ADAPTER) (2) Set the carrier checker for SvVHS mode and set the
DEVI/EAL switch to the "DEVI" pOSItion
I (3) Perform recording in the S-VHS mode
EXT. TRIG. IN
VIDEO OUT (4.) Aiign the sync tip With the icwer marker wrth
TP16 FM OUT R349, while aiign the 100% white with the upper
i 10:1 probe IN marker With R350
i
Carrier Checker Oscilloscooe Note: Confirm that both the sync-tip and the 100% white
(PGJDSOOSQ) are aligned with the markers respectively
Upper marker -> -H-!-
_ I n
H "-_
- i he -
I H. i r
Lower marker -> Au-v-h
R347IED T REG [5} Perform recording In the VHS mode.
(CARRii
; RSABUII [6) in the same manner as the above step (4), use R347
1 DEVi) and R348 to align the sync tip and the WOO/0 white
i thh the iower and upper markers respectiveiy
i
i
CARRIER
MODE DEVIATION
SYNC TIP 100%WHITE
S-VHS 5.4MHsz49 7.0MH1 CR350 i,6MHz
VHS 3.8MHsz47 4.8MH1 CR348 1.0MH1

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- PARTS SIDE -

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