Sanyo VHR-VX400 User manual

FILE NO.
SERVICE MANUAL
Video Cassette Recorder
L
(VHR-VX400, VHR-VX200)
CONTENTS
1.DISASSEMBLY .................................................................... 6
2. ELECTRICAL ADJUSTMENT ............................................ 10
3. TEST POINTS FOR TAPE PATH ADJUSTMENT .............12
4. PARTS LIST
CABINET &CHASSIS PARTS ........................................... 13
MECHANISM PARTS ......................................................... 14
ELECTRICAL PARTS ........................................................ 16
ACCESSORIES .................................................................. 21
PACKING MATERIALS ...................................................... 21
CIRCUIT DIAGRAMS (Refer to the separate volume)
Sqplmil
VHR”VX400
(Product Code: 143179 50)
(Australia)
(New Zealand)
VHR”VX200
(Product Code: 143179 51)
(Australia)
(New Zealand)
VHR-2791R
(Product Code :143179 15)
(Ireland)
Please see other materials with Reference
number given in table below.
~
PRODUCT SAFETY NOTICE
The components designated by asymbol (~) in this schematic diagram designates components whose value are of special
significance to product safety. Should any component designated by asymbol need to be replaced, use only the part designated
in the parts List. Do not deviate from the resistance, wattage, and voltage ratings shown.
NOTE: 1. Parts order must contain model number, part number, and description.
2. Substitute parts maybe supplied as the service parts.
3. N.S.P. :Not available as service parts.
Design and specifications are subject to change without notice.
SE2LNIA, SE2NIA, SE2UIR2 REFERENCE No.SM531OO28

SELF-DIAGNOSIS DISPLAY
Mechanism Mode Display /Head Output Drop Warning Display
This unit displays the diagnosis contents of abnormalities and the mechanism mode on its display panel in 2-digit numbers.
When the head playback output has dropped, the “L” sign will be blinked.
These display shows the outline of the problems. Use it as a reference when servicing the unit.
1. Self-Diagnosis Contents and Mechanism Mode Display
●When the STOP button on the remote control is pressed for about 10 seconds continuously, the self-diagnosis number will be
displayed on the display panel and number indicating the failed mechanism mode (changed mode when being shifted) on the tape
counter “seconds” display for 10 seconds each.
●During self-diagnosis display, displays other than the diagnosis number/mechanism mode number will be turned off and when
displays end, the normal display will be returned automatically.
●Refer to “Self-Diagnosis Contents” for the self-diagnosis numbers and the “Mechanism Mode Display Contents” for the
mechanism mode numbers.
●When the “0:’ button on the remote control unit is pressed during display, and clearing the self-diagnosis display and mechanism
mode display.
Self-Diagnosis number Mechanism mode number
(Tape counter “Seconds” display)
Self-Diagnosis Contents
No. Problem Main Possible Cause Mechanism Operations and
State After Occurrence
00 There is no abnormality in the mechanism.
The cylinder motor does not rotate. ●The cylinder motor is faulty. Shifts to the STANDBY mode, and
01 ●The control of the cylinder motor is the power goes off.
faulty.
●The tape winds around the cylinder.
The take-up reel or supply reel does ●Thetaleup aorsupiW@ iscaught. Shifts to the STANDB’f mode. and
02 not rotate. ●The reel belt is faulty. the power goes off.
●The reel torque has decreased.
The capstan motor does not rotate. ●The capstan motor is faulty.
03 Shifts to the STANDBY mode, and
●The control of the capstan motor is the power goes off.
faulty.
The tape cannot be loaded with the ●Error in the operations of the tape Unloads, shifts to the INITIAL mode,
cassette inserted. loading mechanism. and the power goes off.
(But unloading can be performed.) ●Foreign particles in the tape load-
04 ing mechanism.
cThe tape end sensor is faulty.
●The reel brake of the tape cassette
has not been released.
Tape loading and unloading cannot ●The tape guide is caught. The power is forcibly turned off with
05 be performed with the cassette in- ●The loading motor is faulty. the mechanism at its current position.
serted. ●The control of the loading motor is
faulty.
-2–

L
L.’
No. Problem Main Possible Cause Mechanism Operations and
State After Occurrence
Front unloading cannot be performed ●The cassette drive mechanism is Front loads and shifts to the STOP or
when ejecting the cassette. faulty. INITIAL mode.
(Front loading can be performed.) .The front door is caught. ●When the power switch is turned on
before eject operations Shifts to the
06 STOP mode.
●When the power switch is turned off
before eject operations: Shifts to the
INITIAL mode and the power goes
off .
Front loading and front unloading can- ●The tape cassette is caught in the The power is forcibly turned off with
not be performed when ejecting the cassette drive mechanism. the mechanism at its current position.
cassette. ●The main cam and front rack gear of
07 the front loading mechanism have
not engaged properly.
●The gears of the front loading drive
mechanism have not engaged prop-
erly.
The mechanism becomes 1(RE- ●The mechanism mode switch con- The power is forcibly turned off with
08 VIEW) while moving from 2(IDLER), tact is faulty. the mechanism at its current position.
3(STILL), 4(BRAKE), and to 5
(STOP).
The mechanism becomes 7(INITIAL) ●The mechanism mode switch con- Carries out tape take-up operations,
09 while moving from 1(REVIEW), 2tact is faulty. shifts to the STANDBY mode, and the
(IDLER), 3(STILL), 4(BRAKE), and power goes off.
to 5(STOP).
The capstan motor does not rotate ●The capstan motor is faulty. Shifts to the EJECT mode.
10 and cassette tape eject when cas- ●The control of the capstan motor is Protect cassette tape.
sette tape insert. faulty.
The cylinder motor does not rotate ●The cylinder motor is faulty.
11 Shifts to the EJECT mode.
and cassette tape eject when cas- ●The control of the cylinder motor is Protect cassette tape.
sette tape insert. faulty.
The supply reel does not rotate and ●The supply reel is caught. Shifts to the EJECT mode.
12 cassette tape eject when tape un- ●The reel belt is faulty. Protect cassette tape.
loading. ●The reel torque has decreased.
Note: For details of mechanism operations corresponding to the mechanism positions of the self-diagnosis numbers 08 and 09 above,
refer to the separate volume on the VC mechanism manual. These manual reference numbers are shown in the cover.
Mechanism Mode Display Contents
Mode No.
00
01
02
03
04
05
06
Mechanism Mode
CASSETTE OUT
STANDBY
STOP
STILL
REC-PAUSE
AUDIO DUBBING-PAUSE
FRAME ADVANCE
Mode No.
07
08
09
10
11
12
13
Mechanism Mode Mode No. Mechaniam Mode
SLOW 14 FAST FORWARD
PLAY 15 REWIND
REC 16 VIDEO INSERT
AUDIO DUBBING 17 VIDEO INSERT-PAUSE
X2 SPEED PLAY 18 AUDIO/VIDEO INSERT
CUE 19 REVERSE X2 SPEED PLAY
REVIEW 99 OTHERS
L.
–3–

2. Head Output Drop Warning Display
●When the STOP button on the remote control is pressed for 10 seconds continuously 10 seconds after play starts, “L” will be
displayed blinking at the minutes position on the tape counter when the head output is lower than the specified value to indicate
an abnormality.
●The cause of the abnormality maybe due to drop in the playback output caused by drop in the efficiency of the cassette used or
head clogging. Refer to “Head Playback Output Voltage Check” as a means to judge the abnormality.
IAI
Head output drop warning display (Tape counter of “Minutes” position)
Head playback output voltage check
Warning
asaette Used Display Envelope Detection Output Voltage Main Cause
Cassette
with normal
playback –@;:E+05-0g5v Z:ZE
output Switching pulse normal
(TP1 83: see Fig. CH-1 CH-2
2-l-1)
Envelope detec- 4V -----------------------------------
tion output
(IC301 Pin 85 or
C3016 HOT side:
“L” blinking see Fig. 2-l-1) ~V +G$:han E:!!:z::
Switching pulse been performed accurately
(TP1 83: see Fig. CH-1 CH-2 ●One video head is clogged
Recorded 2-l-1) ●One video head has worn out
cassette
(with tabs) When the average outputvolt-
Envelope detec- 4V -----------------------------------
tion output
(IC301 Pin 85 or
C3016 HOT side:
“L” blinking see Fig. 2-l-1) OV ~,,.than z~g:;;;;;
Switching pulse
(TP183: see Fig. CH-1 CH-2 ●Both video heads are clogged
2-l-1) ●Both video heads have worn
out
Envelope detec- 4V -----------------------------------
tion output
(IC301 Pin 85 or
“L” blinking C3016 HOT side:
see Fig. 2-l-1) Ov k~:::~han :Z::z::
Rental Switching pulse been performed accurately
cassette (TPI 83: see Fig. CH-1 CH-2 ●One video head is clogged
without tabs) 2-l-1) ●One video head has worn out
●Some rental cassettes may have extremely low video playback outputs even when both video heads are normal.
As the average output voltage of the two heads maybe less than 0.5V for some, no warning displays will be
shown.
-J
–4–

3. Cylinder rotation accumulated time display
.-s .Press the STOP button on the remote control for approximately 10 seconds and the cylinder rotation accumulated time excluding
the cassette out and standby operation time will be displayed on the “Hours” and “Minutes” display in units of 100 hours. (“33”
will be displayed for 10 seconds for 3,200 to 3,299 hours.)
●To erase the cylinder rotation accumulated time display, press the RESET button on the remote control during the accumulated
time display.
IAI
Cylinder rotation accumulated display (Tape counter “Hours” and “Minutes” display)
‘L
L
–5–

1. DISASSEMBLY
1-1.REMOVAL OF CABINET, MECHANISM UNIT, AND MAIN BOARD
REMOVING THE CABINET PARTS (Fig. l-l-l) REMOVING THE MECHANISM MAIN UNIT AND THE
1. Remove the cabinet by removing the four screws(1). CP-1 PWB ASSEMBLY (Fig. 1-1-2 and l-l-3)
2. Remove the front panel by removing the locks of the clamps After removing the cabinet parts, remove the mechanism unit
(A) using ascrewdriver, etc. and slightly rotating the bottom and the CP-I PWB assembly connected as follows.
part in the direction of the arrow. 1.
Notes: ●Electrical adjustments for the this model can be 2.
performed with only the cabinet removed. 3.
4.
Remove the three screws (2) as shown in Fig. 1-1-2.
Remove the two screws (3) at the CP-1 board, and then
disconnect the bottom cover.
Remove the two screws (4) and two screws (5) of the
mechanism unit. The two screws (5) of the cassette tray
can be removed easily by pushing the lid opener lever in the
arrow direction to remove the lock as shown in the enlarge
view.
Lift up the whole mechanism unit and main board (CP-1
PWB” assembly), and as shown in Fig. 1-1-3. so that they
can be removed from the chassis.
M-SE2LN/A-l
,6$’(’)
Front P
(1)
Fig. 1-1-1
‘-”
–6–

M-SE2LNIA-2
c
Fig. 1-1-2
M-swLN/A-3
Mec
-1 PWB Assembly
Chassis
Fig. 1-1-2
-7-

1-2. TEMPORARILY SETTING UP AND CONNECTING CP-1 PWB ASSEMBLY
The following is an example of how to place and connect the main board without ajig, when repairing the CP-1 PWB assembly.
1. Place the mechanism unit and main board up side down as 2. Operete the unit using the buttons on CP-I PWB or the
awhole on aflat surface with foil side of the main board remote control.
facing up.
M-SEZLNIA-4 CP-1 PWB Assembly (Foil side)
\
Screws
al Board
Ca
Fig. 1-14
1-3. INSTALLATION OF THE FRONT PANEL
When installing the front panel to the chassis after repaires and adjustments.
1. Pressing down the door opener lever of the mechanism Note: Opened cassette door position does not install the front
main unit. panel to the chassis.
2. Set the cassette door to half-opened state as shown in Fig.
1-1-5, and install the front panel to the chassis.
M-SE2LI’JA-5
Front
c&:&yy’w ~sse,eDoor
(Position B)
Fig. 1-1-5 w
–8-

L
L
L
Note: Before assembling the mechanism unit and the CP-I board, check the eject mode positioning marks as shown in Fig. 1-1-6
and Fig. 1-1-7.
Elh
gearl
Fig. 1-1-6
Fig. 1-1-7
1-4. CIRCUIT BOARD LOCATIONS
L-SE2LN/A
–9–

2. ELECTRICAL ADJUSTMENT
VCR PRESEITING
This VCR need three basic presetting by using the menus displayed on-screen. After all connection have been made, then follow steps
1to 3to preset the VCR.
The three presetting steps will be displayed in sequence on TV screen. The setting are entered with the remote control.
Turn on the VCR
1. Adjusting the TV receiver to the video channel: The AUTO SETUP screen will appear. When the video channel has been preset,
press the OK button on the remote control.
2. Country selection: Using the numeric button, select the country of use.
3. Language selection: When the desired language has been select, press the MENUTW button directly before prevent auto tuning
will start.
When steps 1to 3have been finish, ready to operate the all operating mode.
2-1. SERVO CIRCUIT ADJUSTMENT
.These adjustments should be done upon completion of the tape transport adjustments.
●If the tape transport adjustments (except the tilt adjustment) are done after these adjustments, follow the procedures again in
section 2-1-3, “Switching position adj.”
●When acassette tape is loaded, auto-tracking will be set immediately after starting the first playback. As this will daviate the _
tracking center set, be sure to press the channel buttonsA (+) and r(–) once directly after starting playback to prevent auto-tracking
from being set.
2-1-1. TEST EQUIPMENT AND STANDARDS REQUIRED
Oscilloscope Vertical sensitivity :5 mV/DIV, external trigger
Bandwidth :more than 10 MHz
Alignment Tape VHJ-0009 or VHJ-0023 :SP mode, monoscope, 6KHz
Blank Tape VHS-type cassette tape
Monitor TV
2-1-2. LOCATION OF ADJUSTMENT POINTS
PlB470mE TP182 ; ;TP183 u\
o
TPI 01
-- 0
0
(
(PX’~!le) n
o
IC301
CP-1 PWB (Foil side) Fig. 2-1-1
–lo–