Sony SLV-E420CP / SLV-E420VC / SLV-E520CP / SLV-E520UX / SLV-E520VC Service Manual ▷ View online
5-2
1-2. SERVICE TOOLS
1-2-1. SERVICE TOOLS
NOTES ON ALIGNMENT TAPES
NOTES ON ALIGNMENT TAPES
Select a PAL or NTSC alignment tape from the list below, according to the transmission system of the VCR you are
repairing.
PAL: For models with 625 scanning lines and a field frequency of 50Hz
NTSC: For models with 525 scanning lines and a field frequency of 60Hz
repairing.
PAL: For models with 625 scanning lines and a field frequency of 50Hz
NTSC: For models with 525 scanning lines and a field frequency of 60Hz
VHJ-0005, VHJ-0006, VHJ-0007
VHJ-0003
VHJ-0102
VHJ-0048
VHJ-0014
VHJ-0100, VHJ-0101
VHJ-0045
VHJ-0016
VHJ-0099
No. 1, 2, 3, 4
No. 5
No. 6
No. 7
No. 8
No. 9
No. 10
No. 11
No. 12
No. 13
No. 14, 15
No. 16
VHJ-0106
VHJ-0041
VHJ-0004
Fig.1-2-1
No.
Tool
Tool No.
Remarks
NTSC
PAL
1
Alignment tape
VHJ-0005
VHJ-0008
SP colour bar 1kHz (normal)
2
Alignment tape
VHJ-0006
VHJ-0009
SP monoscope 7kHz (normal)
3
Alignment tape
VHJ-0007
––––––––
EP monoscope
4
Alignment tape
––––––––
VHJ-0052
LP monoscope
5
Eccentric screw driver
VHJ-0003
Used to adjust the tape path
6
Nut box
VHJ-0048
Used to adjust the height of the
lever load assembly
lever load assembly
7
Torque dial gauge
VHJ-0004
Used to measure reel winding
torque
torque
8
Cassette torque meter
VHJ-0016
Used to measure back tension
torque
torque
9
Load lever assembly height adjustment tool
VHJ-0102
Used to adjust the height of the
load lever assembly
load lever assembly
10
Torque gauge screwdriver
VHJ-0014
Used to adjust the tightening torque
of screws
of screws
11
3 mm dia. bit for torque screwdriver
VHJ-0045
Used to replace the bit of the torque
gauge screwdriver
gauge screwdriver
12
Video head removing tool
VHJ-0041
Used to remove the upper cylinder
13
Oil
VHJ-0099
14
Grease
VHJ-0100
15
Grease
VHJ-0101
16
Relay cables
VHJ-0106
Relay cables of mechanism and
CP-1 PWB assembly
CP-1 PWB assembly
5-3
1-2-2. Using the Relay Cable (VHJ-0106)
The mechanism can be repaired without using the relay
cable (VHJ-0106). As shown in Fig. 1-3-1, the relay cable
(VHJ-0106) is a tool used for relay between the CP-1 PWB
assembly and mechanism unit.
When connecting it, take note of the pin number of the
connector.
cable (VHJ-0106). As shown in Fig. 1-3-1, the relay cable
(VHJ-0106) is a tool used for relay between the CP-1 PWB
assembly and mechanism unit.
When connecting it, take note of the pin number of the
connector.
NOTE 1:
Do not place the mechanism upright as shown
in Fig. 1-3-1 when inserting/ejecting the cassette.
NOTE 2:
For NTSC models, be sure to connect the VM-1
PWB assembly and CP-1 PWB assembly.
Mechanism unit
CP-1 PWB assembly
VM-1 (VP-1) PWB
assembly
assembly
Relay cable:
VHJ-0106
VHJ-0106
Fig. 1-2-2
Fig. 2-1-1
2. AN OVERVIEW OF THE MECHANISM
2-1. NAMES OF THE MAIN PARTS
2-1-1. CASSETTE MECHANISM ASSEMBLY
Under frame
Stand L
Release lever
Lid opener spring
Pinion gear
Lock gear
Gear holder
Drive gear
Tray lock
spring
spring
Door opener
lever
lever
5-4
2-1-2. TOPVIEW
2-1-3. UNDERSIDE
Capstan motor
Pinch roller lever assembly
Pinch lift cam
Pinch lift mounting
Front rack gear
Opener mounting
Pinch cam gear
Start rack gear
Load lever assembly
Tape top sensor
L guide act lever assembly
T soft brake assembly
Take-up reel assembly
T reel gear
Cylinder (Drum)
Cleaner lever
Cleaner roller assembly
Capstan brake assembly
Audio R/P head assembly
(ACE head)
(ACE head)
T brake act slide
Clutch mounting assembly
S reel gear
S brake
assembly
assembly
T brake assembly
EP sw lever
EP switch
S soft lever
Supply reel assembly
Band brake assembly
BT spring
Tape sensor LED
BT lever assembly
Tape end sensor
Guide roller assembly
S incline mounting assembly
Full erase head
T incline mounting assembly
Guide roller assembly
Cylinder mounting
Fig. 2-1-2
Fig. 2-1-3
Stator
Rotor
T load gear
S load gear
Crescent mounting
T load lever assembly
S load lever assembly
BT spring lever assembly
MC-1 PWB assembly
Reel belt
Capstan motor
Loading motor assembly
Reel pulley
Friction gear assembly
S brake act slide
Wheel gear 2
Wheel gear 1
Worm gear assembly
Cylinder earth
assembly
assembly
Brake act lever
assembly
assembly
Harness mounting
Pinch cam gear
Mode switch (S8001)
Brake control lever
Main cam
Clutch change lever
Crescent slide
5-5
2-2. AN OVERVIEW OF THE MECHANISM MODES
2-2-1 . MECHANISM MODE SWITCHING TABLE
NOTE:
The letters and figures enclosed in circles in the mechanism mode column are the codes on the crescent slide.
FF/REW
EJECT
CASSETTE IN
IN REW
INITIAL
REVIEW
IDLER
STILL/SLOW
PLAY/STOP
BRAKE
Fig. 2-2-1
6
2
0
7
0
1
0
1
0
2
0
3
0
5
0
4
0
6
EJECT
E
Distinguished by whether the
EP switch is ON or OFF.
Horizontal shift section.
Vertical shift section.
EP switch is ON or OFF.
Horizontal shift section.
Vertical shift section.
IN REW
R
INITIAL
7
Cleaner roller assembly: ON
S/T mounting incline assembly
pressure begins.
S/T mounting incline assembly
pressure ends.
S/T mounting incline assembly
pressure begins.
S/T mounting incline assembly
pressure ends.
REVIEW
1
IDLER pos.
2
(Pinch roller OFF)
STILL/SLOW
3
PLAY/STOP
5
BRAKE pos.
4
FF/REW
6
CASSETTE OUT
(EJECT)
IN REW
(SHORT REW)
INITIAL
(POWER OFF)
The principal mode-switching states of the mechanism
Mechanism mode
HEX
DATA
When loading is carried out starting at
the CASSETTE IN position
the CASSETTE IN position
REVIEW
STILL/SLOW
REC PAUSE
REC
STOP
P LAY
CUE
REW
FF
APPEARANCE OF MODE SWITCH AND
RELATIONSHIP BETWEEN MODE POSITIONS
RELATIONSHIP BETWEEN MODE POSITIONS
MODE SWITCH OUTPUT TABLE
HEX
SW DATA
SW DATA 2
DATA
1
X
Y
Z
0
5.0V
H
H
H
5V
1
5.0V
H
H
L
0V
2
2.5V
H
L
H
5V
3
2.5V
H
L
L
0V
4
3.4V
L
H
H
5V
5
3.4V
L
H
L
0V
6
2.0V
L
L
H
5V
7
2.0V
L
L
L
0V
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