DOWNLOAD Sony JMECHA Service Manual ↓ Size: 1.29 MB | Pages: 41 in PDF or view online for FREE

Model
JMECHA
Pages
41
Size
1.29 MB
Type
PDF
Document
Service Manual
Brand
Device
VCR / DV MECHANICAL ADJUSTMENT MANUAL VI
File
jmecha.pdf
Date

Sony JMECHA Service Manual ▷ View online

— 5 —
Maintenance and inspection item
Tape running surface cleaning
Rotary drum cleaning and
degaussing
Capstan bearing
Loading motor
Abnormal sound
Back-tension measurement
Brake system
Brake system
FWD/RVS torque measurement
Drive
mec
hanism
P
e
rf
ormance c
hec
k
500
a
a
1000
a
a






1500
a
a
2000
a
a






2500
a
a
3000
a
a






3500
a
a
4000
a
a






4500
a
a
5000
a
a






Remarks
Be careful not to attach oil
Be careful not to attach oil
Operating hours (H)
a: Cleaning, ✩: Check
2-3. Periodic Inspection List
Note 1:
When the machine is overhauled, replace the parts referring to the
above list.
Note 2:
Grease
• Be sure to use the specified grease only.  (If grease of different
viscosity is used, it can cause various troubles.)
• The grease used for bearings must not contain any dust or other
matter, otherwise  excessive abrasion and seizure of the bearing
could occur.
• A drop of grease means the amount of grease as shown in the
illustration, which is the amount that is attracted to the tip of a
rod of 2 mm diameter.
• FLOIL grease (SG-941): Part No. 7-662-001-39
Fig. 2-2
2 mm diameter
Grease
— 6 —
2-4. Service Jigs and Tools
Ref. No.
J-1
J-2
J-3
J-4
J-5
J-6
J-7
J-8
J-9
J-10
J-11
J-12
J-13
J-14
J-15
J-16
Name
Cleaning fluid
Wiping cloth
Super-fine applicator
(made by Nippon Applicator (P752D))
Mirror (small oval type)
Tracking tape (XH2-1) (NTSC, PAL)
Mini DV torque cassette
TG1 adjustment jig (FWD position adjustment)
TG1 FWD adjustment screwdriver
Dummy drum (for TG36) (J mechanism)
TG36 gauge
Torque screwdriver
Tape path screwdriver
Adjustment remote commander
(RM-95 upgraded) * Note 1
Mode Selector II
Mode Selector II conversion board (J)
Mode Selector II ROM (supporting J mechanism)
* Note 2
Part code
Y-2031-001-0
7-741-900-53
J-6080-840-A
8-967-997-01
J-6082-360-A
J-6082-492-A
J-6082-364-A
J-6082-490-A
J-6082-491-A
J-9049-330-A
J-6082-026-A
J-6082-053-B
J-6082-282-B
J-6082-493-A
J-6082-314-E
Jig inscription
GD-2038
Used for
Tape path
Tape path
For TG1 FWD position adjustment
For tape path adjustment
General adjustment (ROM version 1.7)
ROM for Mode Selector II
Other required equipment:
 Oscilloscope
Note 1:
If the microprocessor in the adjustment remote commander is not
the new one  (UPD7503G-C56-12), the pages cannot be switched.
In this case, replace it with the new microprocessor (8-759-148-
35).
Note 2:
This is the ROM used for upgrading the version of Mode Selector
II to enable it to be used for the J mechanism.
— 7 —
J-1
J-2
J-3
J-4
J-5
J-6
J-7
J-8
J-9
J-10
J-11
J-12
J-13
J-14
J-15
J-16
Fig. 2-3
— 8 —
2-5. Mode Selector II Operating Procedure
2-5-1. Introduction
The Mode Selector II is a mechanism drive tool that assists
maintenance work of the various mechanism decks.  It has the
following functions.
1. Manual Test
In this mode, the motor of the mechanism deck is powered only
during the period while the switch is turned on manually.  Using the
Manual Test, the operator can freely control the motor of the
mechanism deck.
2. Step Test
In this mode, the motor of the mechanism deck is kept turned on
until the mechanical status is changed from the present mechanical
status that is obtained from the sensor information.  The Step Test is
used to confirm a series of movements of the mechanism deck.
3. Auto Test
The Mode Selector II stores the status transition table in its memory
as data indicating the respective modes of the mechanism deck.
The status transition table can be used to confirm whether a
mechanism deck is operating normally or has abnormality from a
series of movements of a mechanism deck.  If an abnormal status
transition is detected during operation, the “NG” indication appears
and the mechanism stops moving.
Mode Selector II (J-6082-282-B) connection diagram
Fig. 2-4
RVS
FF
SEL
Mode Selector II 
(Ref. No. J-14)
Selector button
LCD display screen
External battery is 
connected here as 
a power supply
Relay board 
(already connected)
Alligator clip
Fig. 2-5
Alligator clip 
(not used in J mechanism)
Mode Selector II
Battery such as NP-55, NP-77 
(power supply)
Connector (white) 6-pin
Relay board
Mode Selector II 
conversion board (J) 
(Ref. No. J-15)
Connector (black) 6-pin 
(not used in J mechanism)
J mechanism
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