Service Manual
Video Cassette
Recorder
W R-220 series
VHR-230 series
VI+ R-235 series
VHR-23 series
VHR-25 series
\,<,;.+. .....i.>.... ,...-:
Illustration:VHR-220G
m
b
.-— —
I
PAL
TABLE OF CONTENTS
1.. CIRCUIT BOARD LOCATIONS
1-1. MAIN BOARDS.
. .. . . . . . . . . . . . . . . . . . . . . . . . . . . .. .. . . . . . . . . . . . . . . .. .. . . . . . . . . . . . . . . . . .
1
1-2. LOCATION FOR TAPE PATH ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . .. .. . . . . . . .. . . 1
2. ELECTRICAL ADJUSTMENT
2-1. PREPARATION . . . .. . . . . . . . . . . . . . . . . . .. . . . . . .. . . . . . . . . . . . . . . . . .. .. .. . . . . . . . .. . . . . . . . 2
2-2. SERVO CIRCUIT ADJUSTMENT . . . . . . . . . . . .. .. . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . 4
2-3. VIDEO CIRCUIT ADJUSTMENT
. .. .. . . . .. . . . . . .. .. . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . .
5
2-4. AUDIOCIRCUIT ADJUSTMENT . .. . . . . . . . . . . .. .. . . . . . . . .. .. . . . . . . . . . .. . . . . . . . . . . . 7
2-5. TUNER lFCIRCUIT ADJUSTMENT . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . .. .. . . . . . . . . . . . 7
3. DISASSEMBLY PROCEDURES
3-1. REMOVAL OF REMOTE CONTROL UNITCASE . . . .. . . . . . . . .. . . . . . . . . . . . . .. . . . 8
—
EP1, EP1L, EP2 series
REFERENCE No. WM-531027
3502L11(N)
1. CIRCUIT BOARD LOCATIONS
1-1. MAIN
BOARDS
L13L068
PW-1 (PowersuPPlY)board=
CP-1(Video,Servo& Audio)board
\< / rTB-’(Termina’)ba‘deo‘re-amp‘“”n /
TM-
N2A’L.
— RFconverter
TM-2 (Operation)board
J ~~y~::;
(Operationkey & Display)board
Installedspecificequipmentand models
TM-5 (OSA:onscreenassist)board:VHR-230G, 230EX, 235E, 25SP, 25PR
TM-8 (VPS)board:VHR-220G, 230G
VD-1 (MESECAMdet.)board:VHR-220PS
Appearanceandspecificationsare subjecttochangewithoutnotice.
Fig. 1-1
1-2. LOCATION FOR TAPE PATH ADJUSTMENT
NOTE: Test point TP182 and TP183 for tape path adjustment is shown in figure below.
For adjustment, refer to the separate volume
“Mechanism Service Technical Information”.
P06L018
Shield
case
\
n
o
‘p”” 07(
*
J
TP183
TP182
SW-P.
ENV.
Fig. 1-2 Video pre-amp unit
:.
–l—
3503.J1 l(N)
2. ELECTRICAL ADJUSTMENT
2-1. PREPARATION
2-1-1. EQUIPMENT
●
●
●
●
●
●
●
●
●
●
●
●
L
●
●
●
Colour lV monitor
PAL Colour-bar generator (with RF and LINE OUTPUT)
Audio signal generator
Oscilloscope (dual trace; frequency response: 10MHZ or
more; probe: 10:1 )
Frequency counter (countable to 10MHZ or higher)
Digital voltmeter
AC voltmeter
In/output probes
Alignment cassette (VHJ-0008) PAL Colour bar 1KHz
Alignment cassette (VHJ-0009) Monoscope 6KHz
Alignment cassette (VHJ-0051 ) Check for D.O.C.
Alignment cassette (VHJ-0023) PAL Monoscope 6KHz,
PAL Colour-bar 1KHz, SECAM Colour-bar 1KHz, PAL RF
Sweep MESECAM Colour-bar 1KHz, NTSC Colour-bar
1KHz.
Relay jig (VHJ-0065) 5-wire cable for Pre-amp unit
Relay jig (VHJ-0084) for CP-1 and CP-2 board
Relay jig (VHJ-0085) for Video pre-amp unit
2-1-2, CONNECTING THE RELAY JIG
When repairing
CP-1
(see Figs.
2-1-2 and 2-1 -3)
NOTE: The connection of any Relay jigs can be done with-
out removing the front panel of the main unit.
1. Remove the seven red screws of the CP-1 board to take
out.
2. Insert the CP- 1 board in the slit of chassis as shown in
Fig. 2-1-3.
3. Connect CNO1 and CN02 of Relay jig (VHJ-0084) into
connectors of the PW-1 board and the Pre-amp unit, in the
direction of arrow as shown in Fig. 2-1-3. Fix the Relay jig
(VHJ-0084) with screw if necessary.
‘...-
4. Connect 12-pin, 8-pin and 4-pin connectors of the Relay
jig to connectorsCN541,CN101 and CN201 on the CP-1
board, respectively.
5. Connect connector from ACE head to CN06 of the Relay
jig (VHJ-0084).
6. After finishing the repairs and adjustments, put the Flat
cables (A) and (B) back to its former position.
When repairing the Video pre-amp unit
(see Figs. 2-1-1 and 2-1 -4)
1. Remove the Pre-amp unit from the chassis, connect
Relay jig (VHJ-0065) between the Pre-amp unit and
cylinder assembly.
2. Connect Relay jig (VHJ-0084) excepting 8-pin connector
between the PW-1 board and CP-1 board as shown in
Fig. 2-1-4. Fix the Relay jig (VHJ-0084) with screw
if
necessary.
3. Connect Relay jig (VHJ-0085) between the top of Pre-
amp unit and CN101 on the CP-1 board.
NOTE:
When repairing or adjusting the Pre-amp unit, be
sure to make contact an end of the Shield case
with Bracket of the Pre-amp unit to maintain the
shield effect. If the Pre-amp unit does not contact,
image can be obtained.
CAUTION: Be sure that the Relay jig does not have touch
with video head or the upper cylinder assem-
bly.
CN02 connectorto
CN181 of Pry-ampunit
8-pin connectorto
CN101 ofCP-1board
Relay jig VHJ-0085
Fig. 2-1-1
FoaJolo
CN06 connectorfrom
12-pin connectorto
CN02 connectorto
connectorforACEhead
>
CN541
of CP-1 board
>>...
CN181 of Pre-amp unit
+.
~Qj\
f~w
8-pin connectorto
<
-.
CN101 of CP-1 board
*.
.<..
CNO1 connector to
<
CN511 of PW-1 board
Relay jig VHJ-0084
“%?&-
4-pin connector to
CN201 of CP-1 board
I
Fig. 2-1-2
1
—2—
350ZJ21(N)
—
201
1
Fig. 2-1-3
I
KWO16
I
Lead wires of connector _
~ 12-pin connector
ector
Video pre-
nector
Relay jig (
Syli
L~&~
), ,
Fig. 2-1-4
2-1-3. SET-UP
Because the RF input signal is used for circuit adjustments, . Check to be sure that there is no spike noise in
connect the colour-bar generator to the ANT IN terminal of
part of the horizontal sync signal.
the sync
the VCR. The RF input signal is processed by the tuner and
IFcircuit. It is improtant that the video output signal of the IF
[
wowcm
circuit satisfies the items shown in Fig. 2-1-5. Connect the
white> ,
oscilloscope to the VIDEO OUTPUT terminal of the video
circuit and terminate with a 75!2 load, and then check the
‘“ T
video output signal.
-[
! Ir [ ~
;‘,) 4b
0.7 Vp-p
.
The amplitude of the sync signal should be approxi-
1 I
mately 0.3 Vp-p.
0.3 Vp-p 4
0
The amplitude of the video signal should be approxi-
4
_f_ ~
>olour burst
0.3 Vp-p
mately 0.7 Vp-p.
-L
o While observing the oscilloscope or TV screen, make
H svnc signal
fine-tuning adjustments so that the colour burst
Fig. 2-1-5
amplitude is approximately 0.3 Vp-p.
–3—
i
3502 S11(N)
2-2. SERVO CIRCUIT ADJUSTMENT
o
These adjustments should be carried out upon completion of the tape transport adjustments.
If the tape transport adjustments (except the tilt adjustment) are carried out after these adjustments, follow the procedures
again in Item 1 SWITCHING POSITION ADJ.
“ Unless otherwise specified, all test point and adjustment location on the CP-1 board.
—
Jo.
—
1
—
Item
SWITCHING
POSITION
Input
Alignment
cassette
(VHJ-0009
VHJ%0231
Mode
PLAY
Point
VIDEO
OUTPUT
TP1OI
RF SW
pulse
TP183
(Video pre-
amp unit)
Location
VR351
Remark
W25SO01
Video signal
7654321 —
v sync
1.
2.
Press the tracking control (+) (-) buttons si-
multaneously to the tracking center position
(Display in the indicator panel “T —:— “).
Adjust VR351 so that the phase of the lead-
ing edge of the vertical sync signal isdelayed
6.5 * 0.5 H from the rise of the RF switching
pulse waveform.
CN201
TP211@
TP2120
o
IC301
CN302
~-.------_------- ,
i-_____ -_-__ --_J
@ VR201
.. .
‘ BIAS
F IC602
,1~--y
------------ ,
,1, ,
TP102
VR101 :-+
PB-Y @+-.------
i..
II
Iclol :
II
VR103 ,---1:
It
,
II
CAR
@Jo._------ __: II
●
lJ
V--I VR102
VR1~:~~‘P103 ‘.?; EE
r
----=
I
,1
DEV -------------
----------- 4
TM-5 OSA
I
I
IRF [
I
~-_---_.-.---------- .
\
conv. ~
1
,
~----- ---------
-1
Tuner ! I ~
-------------------- J L--- __ ---_ --—--i
.--- _---=
~------m
L-------l
L_-__-A
Fig. 2-2-1 CP-1 board (Foil side view)
P13s047 ~
—4—
3502V11(NI
2-3. VIDEO CIRCUIT ADJUSTMENT
Use the Relay jig mentioned in the 2-1. PREPARATION to provide simple adjustment of the Video pre-amp unit.
Unless otherwise specified, all test point and adjustment location on the CP- 1 board.
—
b
—
1
—
2
—
3
—
4
—
Item
E-E
LEVEL
PB-Y
LEVEL
CARRIER
SET
DEVIATION
Input
Colour bar
(100% white
level)
from
Colour bar
generator
Alignment
cassette
(VHJ-0008
VHJ&23)
Colour bar
(100% white
level) from
Colour bar
generator
I
No-signal
Colour bar
(100% white
level)
from
Colour bar
generator
Mode
E-E
PLAY
REC
REC
(Adjust-
ment)
i
PIAY
(Check)
Point
VIDEO
OUTPUT
TP101
VIDEO
OUTPUT
TP101
TP103
VIDEO
OUTPUT
TP101
Location
VR102
VR101
VRI 03
VR104
Remark
w25v031
0.05Vp-p
1. Terminate VIDEO OUTPUT terminal with a
75 ohms.
2. Adjust VR102 so that the level is 1.00 *
0.05 Vp-p.
w25VOOI
%white
7
1 *
0.05Vp-p
1
1. Terminate VIDEO OUTPUT terminal with a
75 ohms.
2. Adjust VR101 so that the level is 1.00 +
0.05 Vp-p.
1.
2.
3.
1.
2.
3.
4.
Input the PAL colour bar signal to VIDEO
INPUT terminal.
Set the channel selector bunonstothe “AV”
position and put the VCR in the REC mode.
Put the VCR in the no-signal REC mode and
adjust VR103 so that the frequency is 3.83
* 0.05 MHz immediately.
0/0white
T
1 * 0.05
Vp-p
1
d
w~
Terminate VIDEO OUTPUT terminal with a
75 ohms.
Insert the blank tape to the VCR and record
colour bar signal.
Playback the recorded part, and check that
the level is 1.00* 0.05 Vp-p.
If the adjustment value is not satisfactory,
adjust VR 104 and repeat step 3.
–5—
ii
3502V21(N)
—
10
—
5
—
Item
Y/C REC
CURRENT
Input
Colour bar
from
Colour bar
generator
Mode
REC
Point
Compassion chart of Models and Marks
rP181 (HOT]
Shield case
(GND)
(Video pre-
amp unit)
Location
VR182
(Video pre-
amp unit)
Remark
w25v02t
~ models
A 800+25 mVp-p
B: 500 ~ 25 mVp-p
L
AL
-IL
H sync
H sync
1.
2.
3.
Connect the ground of the oscilloscope to
the Shield case of Video pre-amp.
Set the channel selector buttons to the AV
position and place in the SP record mode.
Adjust VR182 so that the signal level at the
sync tip is 600*25 mVp-p (for models A), or
500 A 25 mVp-p (for models B).
Note: Follows are the applicable models and
their corresponding mark.
Model
Mark
I I
vHR-220 series, VHR-230 series, VHR-23
series, VHR-25 series
A
VFIR-235 series
B
rwavo2
—
Fig. 2-3-1 Video pre-amp unit
Shield case
\
VR182
REC Y/C
~
\ \
101
TPlk
—6—
3502A11(N)
i
2-4. AUDIO CIRCUIT ADJUSTMENT... Applies to “SP/LP tape speed models” (ex. VHR-235E...) only.
“
Unless otherwise specified, all test point and adjustment location on the CP- 1 board.
E
No, Item
1
BIAS
LEVEL
2-5, TUNER IF
Input
Mode Point Location Remark
1.Set the channel selector buttons to the AV
No-signal REC
TP201 (HOT)
VR201
position and place in the SP record mode
TP202 (GND) without a signal.
2. Adjust VR201 so that the level is 23 mVrms.
:IRCUIT ADJUSTMENT
“ There are two of the VIF unit’s type and different with the model as shown in figure below.
—
do
—
1
—
Item
RF AGC
Input
Tv
broadcast
Mode
E-E
Point
TV screen
VR611 a
RFAGC
B
Ic
611
Location
VR611
(VIF unit)
WPE A
CP-1board
/
~
Remark
I
1.
2.
Receive the middle electrical field (60 dB - I
80 dB) of the TV channel, and slowly turn
-“
VR611 from the point where snow-noise is
present to the point where itjust disappears
from the monitor TV.
Confirm by monitor TV that there is no beat
and saturation (S/N is best point) when re-
ceiving any TV channel.
VR611
RF AGC
CP-1board
TYPE B
Fig. 2-6-1 VIF unit (Partsside view)
J
—7—
.-
—- ,
3502B1 1(N)
3, DISASSEMBLY PROCEDURES
3-1. REMOVAL OF REMOTE CONTROL UNIT CASE
Open the remote control unit case as follows. Although a
large type remote control unit is shown in the figure bellow,
small type remote control unit can be opened by the same
procedures.
NOTE: When opening the remote control unit for repairing,
use a GUITER PICK made of plastic (1 mm thickness) shown
in the Fig. 3-1-2 or the like (a thin plastic piece) to prevent
scratching.
Never use a metal screwdriver to avoid scratching.
1. Open the battery cover and take out batteries, the then
remove the bottom case fixing screw.
2. Applying force strongly to the battery compartment edge
in the arrow (A) direction by your thumb as shown in Fig.
3-1-1 to make a space (B) between the bottom and upper
case as shown in the cross section Fig. 3-1-3.
m7Bml
Edge
r
\A
Make a space (B)
/
$
Battery
compartment
Bottom case —
/
*Q%
Upper case
Fig. 3-1-1
P07BO03
G
GUITER PICK or
Thin plastic piece
Fig. 3-1-2
Make a space (B)
~~y
GUITER
‘~><~ plCK
\
Hooks (F)
Bottom case
1
Upper case
Fig. 3-1-3
I
To make this procedure easier, push the remote
contro
unit end (C) against your body Fig. 3-1-4.
3. Insert the GUITER PICK above mentioned into the
space
(B) as shown in Figs. 3-1-3, 3-1-4 and move the PICK i
the arrow (D) and (E) direction, then disconnect two
hooks
(F) of the top of the cases.
4. Applying force to the space (B) and battery compartment
edge by your thumb so that the bonom case is
separated
from the upper case as shown in the Fig. 3-1-5.
5. Insert the PICK into the space (G) of the case side
slanting-
ly against the bonom case and move the PICK
tc
disconnect the hooks (H) of the side in order from top
tc
bonom Fig. 3-1-5.
6. Disconnect the hooks of the other side using the pick
b
the same procedure as step 4.
I
P07BW2
/ GUITER PICK
c
Fig. 3-1-4
I
Keep a space (6)
K
Batt
com
H)
Fig. 3-1-5
—8—
Jan./’97&13l3 HA
Printed in Japan
SANYO Electric Co., Ltd.
Osaka, Japan
.,
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