Sanyo VHR-1110 Series User manual

SERVICE MANUAL
COLOUR VIDEO
CASSETTE RECORDER
VHS
PAL
Models
VHR-1110
eee VHR-1700M
VHR-2300 rl n
VHR-2500
Series
and
VHR-2350EE
VHR-2700
MECHANISM DESCRIPTION
AND
MECHANISM ADJUSTMENT
TABLE OF CONTENTS
1. MECHANIMS DESCRIPTION PAGE
1-1. MAIN MECHANISM COMPONENTS AND LAYOUT DIAGRAM ........... 0.00 eve eeee 1~2
1-2, OUTLINE OF MECHANISM OPERATION .......... 0... cece ee te eee eens 3
1-3... DIFFERENCES FROM PREVIOUS MODELS 20 o a ta eee eee ee Rea wae 3~5
1-4, MECANISM OPERATION INEACH MODE ........... 0. cece cee et ee eee 6
be “OPERATION JIN-EACH MODE: 2.4.54 4 44 te eG ee and mae eee ORM OR ae ak ae 7~10
2. MECHANISM ADJUSTMENT
2-1. JIGS AND TOOLS FOR ADJUSTMENT... 10... .. eee ce ee ee tees 11
2-2. STANDARD MAINTENANCE TIMETABLE... 1... ee ee ee tees 12
28 CLE IN IN Gi i set seca akg Meck, Wee ott hs ke th Sole tee ae etc hte here. nepal nara tere ab ea ab at Beata 13
2-4. MECHANISM REPAIR AND PARTS REPLACEMENT ........ 0... cee eee eee eee 14~21
2-5. PREPARATIONS FOR ADJUSTMENT... 0.0... 0... eee ee ee ens 22
2-62 “ADJUSTMENT «sae Seeley & be eG Re iees Pa hE O OSE ASE eS Ses 23~28
2-7. CHECKING AND ADJUSTING THE TAPE-TRANSPORT SYSTEM .......... 0000s eee 29~31
Reference No. WM-18674

1. MECHANISM DESCRIPTION
1-1.
MAIN
MECHANISM
COMPONENTS
AND
LAYOUT
DIAGRAM
(Figs.
1-1-1
and
1-1-2)
Loading Motor
Full-width erase head
8g RABIES DCN ASO IEE
Impedance roller
Bs
3
ii
=
avin re =
2. o
os
Capstan Motor
shaft
Leading guide
Review guide
(Supply-side)
lever
Leading guide
(Take-up side) :
Loading Brake
NI Tape Sensor ™
Back-Tension lever
Brake
Band
Take-up
Reel
base
Supply reel base
Se ee ees
Soft Brake
(Take-up side)
Soft Brake
(Supply side)
Erase Prevention SW Main Brake Idler stopper Roller Assy. Main Brake
(Supply side) (Take-up side)
Fig. 1-1-1 Mechanism Assembly Top View
SR main changed parts compared to former models VHR-1100, VHR-1300 and VHR-1500.

Pulley (Loading Motor) Small belt Two-step Pulley Large Beit Small Pulley
eee
ress tit geal | Press-fit gear
nae a (Supply side)
1
Capstan
Motor
Large
Pulley
Capstat belt ; % Two-step gear
m : (small)
Two-step gear
Main Slide Sector gear
Solenoid ! VA
(VHR-2500 | i x ¢ Sneeptaiar ‘ Momentary Brake
' Intermediate gear
series only)
Mode Detection switch Review gear Main slip gear POM. Lever Sub slide
Momentary Brake slip
gear
Fig. 1-1-2 Mechanism Assembly Bottom View

1-2. OUTLINE OF MECHANISM OPERATION
The greatest change compared to former models (VHR-
1100, VHR-1300 and VHR-1500 series) is the change of
rotation of both reel bases from the reel motor to the
capstan motor.
well as the movement of both guides, the transition device
to each mode, and the safety device, are fundamentally the
same as for previous models (VHR-1100, VHR-1300 and
VHR-1500 series), so their description is omitted here.
1-3. DIFFERENCES FROM PREVIOUS MODELS
(VHR-1100, VHR-1300 and VHR-1500 series)
There are five points which are different, regarding the
mechanism’s main components, between this mechanism
and that of former models.
The operation of those components is described below.
1-3-1. Method of drive transmission of both reel bases
By using this mechanism, the reel motor is eliminated, and
the rotation of the capstan is transmitted via the belt to the
main slip gear; the direction of reel base rotation depends
upon the direction of rotation of the capstan.
As a result, it can be seen that the function of the newly
added main slip gear is very important.
Figure 1-3-1 shows the rotation-transmission system.
*Main slip gear:
The slip mechanism functions during the PLAY, REC,
F/R-SEARCH and SLOW modes.
In other words, because force is transmitted from the
pulley gear to the drive gear via the felt for slippage during
these modes, the rpm of the drive gear is caused to be
reduced to less than the rpm of the pulley gear. The pulley
gear and the drive gear are locked during the F-FWD and
REW
modes,
with
the
result
that
the
rotation
of
the
pulley
gear and of the drive gear is the same rotation.
* Review gear:
The review gear is engaged with the main slip gear during
the R-SEARCH mode.
Capstan Motor
Main slip gear
Drive gear
Pulley gear
Supply, Take-up reel base
Drive gear
Felt for
slippage
Pulley gear
Roller Assy.
Fig. 1-3-1

1-3-2. Main slip gear (Fig. 1-3-2(a) and Fig. 1-3-2(b))
The main slip gear is composed of the pulley gear and the
drive gear. A slip mechanism made of felt is incorporated at
the drive gear side.
Figure 1-3-2(a) shows the ordinary conditions (PLAY,
REC, F/R-SEARCH, UNLOADING, SLOW, etc.).
When the capstan motor rotates during these conditions,
the pulley gear is caused to be driven, and thus the drive
gear is caused to be driven via the slip mechanism.
Figure 1-3-2(b) shows the fast forward and rewind condi-
tions.
The FF lever is caused to move in the-»direction by the
sub slide being activated in the loading direction by the
movement of the cam.
As a result of this action, the spring coil located between
the FF lever and the direct lever is caused to be pulled, with
the result that the lock ring is caused to be activated in the
lifting direction.
As a result, the pulley gear and the drive gear are caused to
be locked, and, when the capstan motor rotates, the pulley
gear and drive gear rotate as a unified component, with the
result that there is no slippage.
Pulle
eet a ald Main slip
Spring
Direct lever
Fig. 1-3-2(a) Slip condition
FF lever
Direct lever
Fig. 1-3-2(b) Lock condition
—4q—

1-3-3. Review gear
This gear functions during the R-SSEARCH mode.
Because tape take-up during the R-SSEARCH mode is via the
drum, a stronger rotation (than for the F-SEARCH mode)
is necessary.
Detection
Main slide
(The rotation torque during the F-SSEARCH mode is 70
+15g-cm, and during the RSSEARCH mode is 200 +30g-cm.)
For this reason, the review gear is used to increase the
rotation torque of the main slip gear (pulley gear and drive
gear).
Main Slip Gear
ee ee
Review gear
Moving the main slide from PLAY mode © to R-SEARCH mode@®.
Fig. 1-3-3
1-3-4, Capstan “soft’”’ braking by solenoid
(Fig. 1-3-4 VHR-2500 series only)
The “soft” braking is switched ON during the SLOW mode
and the STILL mode.
The capstan motor operates under intermittent drive
conditions during the SLOW mode and the STILL mode. In
order to stabilized the intermittent drive of the capstan
motor, a solenoid is used to apply braking to the capstan
motor.
Capstan Motor
Capstan soft brake
Solenoid
The voltage applied from the system-control circuitry to
both terminals of the solenoid during the SLOW mode and
the STILL mode is 13V.
1-3-5. Loading brake (Fig. 1-3-5)
In order to eliminate tape loosening or slack during the
loading operation, braking is applied to the supply reel base
side during loading.
When the loading operation is finished, the loading brake is
released.
Ue
j ifn gy
Nn Pde
Loading brake
Supply reel base
5
E
:
O
Idler stopper

1-4. MECHANISM OPERATION IN EACH MODE
a ets
Capstan
Motor
Drum
Motor
Loading
Motor
(Table cerns
Supply | Take-up |Supply | Take-up
side side side side
| SoftBrake |
Brake
Mode
Detection
Loading
Brake
(Supply
Reel Base)
Position
ON OFF
ON>OFF
ON ON
PLAY/REC| OFF ON OFF | OFF
(CW) oan
F-SEARCH| OFF ON OFF | OFF
(CW) con
ON
REVERS
rite ee. bee ac ace MORE gee lh Ane Rox
SLOW
(VHR-2500| OFF OFF | OFF ON OFF OFF
series only) (cew)
ON
ON
ON>OFF
PAUSE OFF OFF (ewocew) coed OFF | OFF ata ON OFF @)
ON ON>OFF
EJECT icw) OFF eewl OFF OFF ON ON ON OFF OFF Gd)
Notes:
1. CW: clockwise
CCW: counterclockwise
The rotation of the front-loading, reel, capstan and drum motors is as seen from the chassis top, and the rotation of the loading motor is a
seen from the bottom of the chassis.
ON/OFF of brakes:
ON: Brake is applied to reel base.
OFF: Brake is not applied to reel base.
nS
Table 1-4-1

1-5, OPERATION IN EACH MODE
For this model, both ree! bases are rotated according to the
drive by the capstan motor.
As a result, the method employed for transmission of the
rotation of both reel bases has been changed from the reel
motor used for previous models (VHR-1100, VHR-1300
and VHR-1500 series) to the capstan motor.
Even though the operation for each mode has changed from
the reel motor to the capstan motor, the movement of the
mechanism is fundamentally the same as for previous
models.
1-5-1. From STOP mode to PLAY mode
CPLAY) button is pressed.
Mode Detect SW ®@.
Head Motor
100ps
PLA
Capstan Motor:
RWO |
12V
Lo.
Tape Loading Motor ‘aoe
Unto.
Main brake
ro 100ms
The movement of the motor and brakes during the follow-
ing four operations is described by timing chart, and the
explanation is omitted here.
(1) From STOP mode to PLAY mode
(2) From PLAY mode to R-SEARCH mode
(3) From REC mode to REC PAUSE mode
(4) From STOP mode to F-FWD (REW) mode
(5) From PLAY mode to STOP mode
Moving the Leading guide to loading direction.
PLAY mode
(@! Leo)
Y Rotation PLAY Rotation
a
5SV
1
DY,
Cie
eS
SOS)
<r
(Supply
reel
base
side)
~{OFF
Soft brake
(Supply reel base side) ( ; {ON
Loading brake ;
\
'
Main brake
fh eo
(Take-up
ree!
base
aie
ggg
Sl
ae
es
i]
Soft brake
1
rc, Cr
(Take-up
reel
base
Sid@)
ope
pes
ee
ee
Review brake
;
ON
a
SE
ae
ees
Table 1-5-1 Timing chart of from STOP mode to PLAY mode

1-5-2. From PLAY mode to R-SEARCH mode
button
is pressed. | R-SEARCH mode
Mode Detect SW
—_
Head Motor (i Seen i
f] 1
{ |
u 1
Capstan Motor sewo; | rt—“:;Cs*s*s*~C—C—C—s—~sdrSCSCidY
#RWO
|
PF
200s
ec
| RVS PLAY Rotation
Lo.
300
psec
a
R-SEARCH
Rotation
Tape Loading Motor
p
g
5,
ee
Tl
Sonsec
Main brake
Unlo. 5.5V
|
l
(Supply reel base side) —{OFF
Soft
brake
ON
(Supply
ree!
base
side) (OFF
Loading brake —(oFF
Main brake ON
(Take-up reel base side) (FF
Soft brake $n
(Take-up
reel
base
side)
—{orrF
}p—-—
$$
ON
Review
brake
—(OFF
ec
eS
I
Table 1-5-2 Timing chart of from PLAY mode to R-SEARCH mode
1-5-3. From REC mode to REC PAUSE mode
PAUSE/STILL) button is pressed. REC PAUSE mode
Mode Detect SW
Nn
Head Motor
1
|
I
i
|
'
y
|
Capstan
Motor
+Fwol
Short
REV
{RWD
|
:
I. 12V
ry
+ |
tot
' 1
| I
1 PLAY Rotation | !
| tol
i l
! i |
an)
[7] sec
3
L ri
ed mate
:
|
Tape Loading Motor
¢}
>]
= 9°
=5.5V 5Opsec -5.5V
Main brake
(Supply reel base side) —{oFF
ae Gree ee
(Supply
reel
base
side)
—{OFF
Loading brake (FF jp
Main brake
(Take-up reel base side) —{OFF
|
Soft brake
(Take-up reel base side)
CN
a
evant
Se
ee
AREF
Si
Se
ae
Table 1-5-3 Timing chart of from REC mode to REC PAUSE mode
—38—

1-5-4. From STOP mode to F-FWD mode
(See Fig. 1-5-1, Table 1-5-4)
When the FF button is pressed during the STOP mode, the
mode changes to the F-FWD mode. The movement of the
main gear at this time is as described below.
As a result of the movement of the sub slide in Fig. 1-5-1 in
the direction of arrow G), the FF lever is caused (by the
hook of the sub slide) to move in the direction of sub slide
@.
Direct lever to be moved in the
perpendicular up direction @
Review gear
button is pressed.
Mode Detect SW chs @)
Head Motor
Capstan Motor
Tape Loading Motor
Main brake
Soft brake
Direct Lever
F-FWD
(REW)mode
The
spring
located
between
the
FF
lever
and
the
direct
lever
is
thus
caused
to
be
pulled,
causing
the
direct
lever
to
be
moved
in
the
perpendicular
up
direction,
with
the
result
that
the
main
gear
@)
is
driven
directly.
At the same time, the review gear is caused to move away
from the main gear, with the result that the main gear
rotates at high speed.
F-F Lever
Q+—
Sub slide
Main slip gear
STOP mode
' .
psec
ON
FE
(Supply
reel
base
side)
—(OFF
)
|
(OFF
|
i
Loading brake
|
|
|
Main brake on
(Take-up reel base side)
|
Soft brake
(Take-up reel base side) —{orF )
oN }-—
Review brake
——{ OFF oe
|
sa cg aaa
!
Table 1-5-4 Timing chart of from STOP mode to F-FWD (REW) mode

1-5-5 From PLAY mode to STOP mode
Moving the Leading guide to unloading direction.
STOP) button is pressed. STOP mode
Mode Detect SW
Head Motor
Main brake
(Supply reel base side) —lorr
Soft brake
(Supply reel base side) —OFF
Loading brake —{OFF
Main brake
(Take-up reel base side) (FF
Soft brake (on
(Take-up
reel
base
side)
—{orr
}————
$$
: ON
Review brake PE Sa) 2 ESS ED aera re
‘
Table 1-5-5 Timing chart of from PLAY mode to STOP mode
—10—

2. MECHANISM ADJUSTMENTS
2-1. JIGS AND TOOLS FOR ADJUSTMENT
a
La
Cassette
stand
plate
gauge
VHJ-0001
Adjustment
of
reel
height
peed
Position
adjustment
gauge
VHJ-0013
Adjustment
of
back
tension
guide
(New)
es
Te
[eons
[vino
[ie
Te
|
eeesmeie
[vs
|
teen
ee
ee
a
ee
P|
ete
[vom
|
Attn
a
ca
Torque
gauge
driver
VHJ-0021
Adjustment
of
fixed
order
screw
Position
adjustment
gauge
VHJ-0024
Adjustment
of
tape
sensor
position
VHJ-0001 VHJ-0013 (New) VJ-0017
. : No. 3
VHJ-0058, VJ-0108
a=

VHJ-0004 VHJ-0008, VHJ-0009, VHJ-0020 (New | VHJ-0016 (New)
VHJ-0021 (New) VHJ-0024
2-2. STANDARD MAINTENANCE TIMETABLE
In order to keep the VCR in peak working order, care for the parts indicated in Table 2-2-1 at the periods given.
SUPPLY REEL
O : Cleaning CO : Parts replacement Table 2-2-1
4 : Lubrication
=

2-3. CLEANING
2-3-1. VIDEO HEAD (See Fig. 7-3-1.)
(1) Turn off the power. [Set the power switch to the OFF
position. ]
(2) Move the video head drum to a position at which the
video heads are easy to clean.
(3) Wipe each head several times with the deerskin part of
the head cleaning stick. If the heads are extremely dirty,
wipe more times.
(Note)
@ When pressing a finger on the head cleaning stick to
clean the heads, do not press too hard.
e Do not move the head cleaning stick up and down
against the video heads; doing so will damage the heads.
Cleaning stick
2-3-2. TAPE PATH
Clean the surfaces of the tape guides and the drum tape
path by using a soft cloth or cleaning stick moistened with
an alcohol.
(Note)
When cleaning the drum surfaces, be careful not to contact
the video heads.
ae ee ae
2-3-3. PINCH ROLLER, CAPSTAN, SUPPLY AND TAKE-
UP REEL BASE
(1) Using a soft cloth moistened with alcohol, clean the
surfaces of the pinch roller, capstan, supply and take-up
reel base.
(2) If there are scratches on the pinch roller, remove the
E-ring and replace the pinch roller lever assembly.
2-3-4. CLEANING THE AUDIO/CONTROL HEAD AND
FULL-ERASE HEAD (See Fig. 2-3-2, 2-3-3.)
Apply alcohol to the cleaning stick, and move the cleaning
stick against the heads in the direction of the head gap.
Full-erase head
Cleaning stick
Fig. 2-3-2
Audio/control! head
Cleaning stick

2-4. MECHANISM REPAIR AND APRTS REPLACEMENT
2-4-1. BACK TENSION BRAKE BAND (See Fig. 2-4-1.)
(1) Remove the spring (a).
(2) Remove the screw (b) and washers (c), and then
remove the brake band and backtension lever.
(3) Disconnect the brake band lever from the back tension
lever.
(4) Install the new brake band by reversing the removal
procedure.
(Note)
Be careful not to crease or scratch the new brake band.
(5) Adjust the position of the back tension lever.
Back tension
Brake band
bracket
2-4-2. FRONT LOADING MOTOR (See Fig. 2-4-2.)
(1) Disconnect the MC-32 printed circuit board from the
solder terminals of the front loading motor.
(2) Remove the front loading motor belt.
(3) Remove the screws (a) which hold the front loading
motor.
(4) Replace the front loading motor, and install it in the
reverse order of removal.
MC-32
Printed
circuit
board
Front loading motor
—14—

2-4-3. SUPPLY REEL BASE (See Fig. 2-4-3.)
(1) Remove the fix screw of brake band. (refer to Fig.
2-4-1)
(2) Remove the spring (a), and then remove the supply
soft brake.
(3) Remove the washer (b), and then remove the main
srip gear.
(4) Remove the three screws (c), and then remove the
bracket with roller assembly.
(5) Remove the supply reel base.
(Note)
Be careful not to lose the height adjustment spacer.
(6) Wipe off the old oil from the reel shaft by using a
cloth moistened with alcohol, and then apply a small
amount of new oil.
(7) If a new supply reel base is being installed, adjust the
Supply reel base
Hight
adjustment
spacer
hg
reel base height.
Spring eed
Supply soft brake
Roller Assy.
Main slip gear
2-4-4. TAKE-UP REEL BASE (See Fig. 2-4-3.)
(1) Remove the one screw (c), and then remove the
bracket.
(2) Remove the spring (d), and then remove the take-up
soft brake.
(3) Remove the take-up reel base.
(Note)
Be careful not to lose the height adjustment spacer.
(4) Wipe off the old oil from the reel shaft by using a
cloth moistened with alcohol, and then apply a small
amount of new oil.
(5) If a new take-up reel base is being installed, adjust the
reel base height.
Take-up reel base
Height adjustment spacer
oo (d)
Take-up
soft brake
Ge

2-4-5. CAPSTAN MOTOR (See Fig. 2-4-4.)
(1) Disconnect the capstan motor connector.
(Note)
Be sure that the power is off [the power switch in the
OFF position} when connecting or disconnecting the
connector.
(2) Remove the screws (a), and then remove the bracket.
(3) Remove the screws (b) securing the capstan motor, and
then remove the motor.
(4) Install the new capstan motor by using the reverse
order of the removal procedure.
Capstan motor
Bracket
Fig. 2-4-4
2-4-6. ROLLER ASSEMBLY (See Fig. 2-4-5)
(1) Remove the washer (a), and than remove the roller
assembly.
(2) Install the new roller assembly by using the reverse
order of the removal procedure.
Washer (a)
Roller Assy.
—16—

2-4-7.
UPPER
DRUM
(See
Fig.
2-4-6.)
2-4-8.
DRUM
MOTOR
(See
Fig.
2-4-7.)
(Models VHR-2100EX, VHR-2300 EX, G) (Models VHR-2100 EX, VHR-2300 EX, G)
(1)
Remove
the
screw
(a),
then
remove
the
brush.
(1)
Remove
the
screws
(a)
securing
the
rotor,
and
then
(2)
Remove
the
screws (b)
which
hold
the
upper
drum, remove
the
rotor.
and than remove the soldered lead wire. (2) Remove the screws (b) securing the stator, and then
(Note) remove the stator.
Be careful to the solder the lead wire at correct position. (3) Install the new drum motor by using the reverse order
(3)
Check
the
tape
path.
of
the
removal
procedure.
VIDEO HEAD LEAD WIRE POSITION (TOP VIEW)
RED TUBE (don’t remove)
Yellow lead wire Red lead wire
Brown lead wire Yellow lead wire
BROWN TUBE
Fig. 2-4-6
(Note)
Use the torque gauge screwdriver (VHJ-0014) for installa-
tion of the stator and rotor.
The tightening torque of the stator is 3kg-cm, and for the
rotor is 2kg-cm. (When installing, first tighten to a tem-
porary tighteness and then tighten to the specified torque.)
=

2-4-9. DRUM ASSY. (See Fig. 2-4-8.)
(Models VHR-2100 EX, VHR-2300EX, G)
(1) Remove the screw (a), and then remove the brush. (4) Remove the screws (c), and then remove the drum
(2) Remove the screws (b), and then remove the shield assembly.
plate. (Be careful not contact the video heads)
(3) Remove the soldered lead wire of MC-30. (5) Install the new drum assembly by using the reverse
order of the removal procedures.
(b)
Shield plate
Drum Assy. |
Q
ee drum rotaly trans, lead a
install position
P.C.B. MC-30
(Black marking)
(Black
marking)
eA
a
Green
wire
Red wire
From under drum Trans.
—18—

2-4-10. UPPER DRUM (See Fig. 2-4-9.)
Models VHR-1110, VHR-2100, VHR-2300, VHR-2500
series and VHR-1700M, VHR-2350EE except models
VHR-2100EX, VHR-2300EX, G.
(1) Remove the screws (a) which hold the upper drum,
and then remove the soldered lead wire.
(Note)
Be careful to the solder the lead wire at the correct posi-
tion.
(2) Check the tape path.
VIDEO HEAD LEAD WIRE POSITION [Top view]
(Models: VHR-1100, VHR-2100, VHR-2300
series and VHR-1700M, VHR-2350EE except
models VHR-2100EX, VHR-2300EX, G)
Yellow
lead
wire
Red
lead
wire
(don’t remove)
White lead wire Yellow lead wire
(Models: VHR-2500 series)
Red lead wire
Blue
lead
wire
Yellow
lead
wire
Upper drum
Red lead wire Red lead wire
White lead wire
Fig. 2-4-9
2-4-11. DRUM MOTOR (See Fig. 2-4-10.)
Models VHR-1110, VHR-2100, VHR-2300, VHR-2500
series and VHR-1700M, VHR-2350EE except models
VHR-2100EX, VHR-2300EX, G.
(1) Remove the screws (a), than remove the brush.
(2) Remove the screws (b) securing the rotor, and then
remove the rotor.
(3) Remove the screws (c) securing the stator, and then
remove the stator.
(4) Install the new drum motor by using the reverse order
of the removal procedure.
C
Speacer ————>-
(0 or 1)
Rotor
Fig. 2-4-10
(Note)
e Use the torque gauge screwdriver (VHJ-0014) for installa-
tion of the stator and rotor.
The tightening torque of the stator is 3 kg-cm, and for the
rotor is 2 kg-cm. (When installing, first tighten to a tempo-
rary tighteness and then tighten to the specified torque.)