Sanyo VHR-850 User manual

FILE NO.
-=
SERVICE MANUAL
Video Cassette Recorder
(VHR-850)
CONTENTS
SELF-DIAGNOSIS DISPLAY .................................................... 2
Sqlwlo
VHR-850
(Product Code :143173 47)
(Australia)
(Product Code :143173 48)
(New Zealand)
VHR-870
(Product Code: 143173 43)
(Australia)
(Product Code :143173 44)
(New Zealand)
VHR-890
(Product Code: 143173 41)
(Australia)
(Product Code: 143173 42)
(New Zealand)
1. Disassembly ....................................................................5
2. Electrical ADJusTMENT ..............................................9 Please see other materials with Reference
3. TEST POINTS FOR TAPE PATH ADJUSTMENT .............13 number given in table below.
4. PARTS LIST
LMECHANISM PARTS ......................................................... 14
CABINET &CHASSIS PARTS ........................................... 16
ELECTRICAL PARTS ........................................................ 17
Accessories .................................................................. 25
PACKING MATERIALS ...................................................... 25
CIRCUIT DIAGRAMS (Refer to the separate volume)
Materials IModel No. IReference No.
~‘RODucT‘AFEW‘OT’cE~
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 patis may be supplied as the service parts.
3. N.S.P. :Not available as service parts.
Design and specifications are subject to change without notice.
AP21WA2, NZ2, A, NZ, AP4HNIA, NZ REFERENCE No.SM531665

SELF-DIAGNOSIS DISPLAY
Mechanism Mode Display/ Head Output Drop Warning Display/Cylinder Rotation Accumulated
Time 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 “V sign will be blinked. Some models (listed later) will also display the cylinder
rotation accumulated time.
These display shows the outline of the problems. Use it as areference when servicing the unit.
1. Self-Diagnosis Contentes 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 reception channel display of 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 and the cylinder accumulated
rotation time display described later (some models only) 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 “O” button on the remote control unit is pressed during display, and clearing the self-diagnosis display and mechanism -
Self-Diagnosis number Mechanism mode number
(Reception channel display) (Tape counter “Seconds” display)
Self-Diagnosis Contents
No.
00
01
02
03
04
05
Problem Main Possible Cause Mechanism Operations and
State After Occurrence
There is no abnormality in the mechanism.
The cylinder motor does not rotate.
The take-up reel does not rotate.
The capstan motor does not rotate.
The tape cannot be loaded with the
cassette inserted.
(But unloading can be performed.)
Tape loading and unloading cannot
be performed with the cassette in-
serted.
.The cylinder motor is faulty.
●The control of the cylinder motor is
faulty.
●The taDe winds around the cylinder.
●The take-up reel is caught.
●The reel belt is faulty.
●The take-up torque has decreased.
●The capstan motor is faulty.
●The control of the capstan motor is
faulty.
●Error in the operations of the tape
loading mechanism.
●Foreign particles in the tape load-
ing mechanism.
●The tape end sensor is faulty.
●The reel brake of the tape cassette
has not been released.
●The tape guide is caught.
●The loading motor is faulty.
●The control of the loading motor is
faulty.
Shifts to the STOP mode.
Shifts to the STOP mode.
Shifts to the STOP mode.
Unloads, shifts to the INITIAL mode,
and the power goes off.
The power is forcibly turned off with
the mechanism at its current position.
.-
.-
–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 periormed 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 INITIAL 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 STANDBY mode.
10 and cassette tape eject when cassette ●The control of the capstan motor is Protect cassette tape.
tape insert. faulty.
The cylinder motor does not rotate ●The cylinder motor is faulty.
11 Shifts to the STANDBY mode.
and cassette tape eject when cassette ●The control of the cylinder motor is Protect cassette tape.
tape insert. faulty.
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 V95 Imechanism manual. These manual reference numbers are shown in the cover.
Mechanism Mode DiSDIW Contents
.-
Mode No. Mechanism Mode Mode No. Mechanism Mode Mode No. Mechanism Mode
00 CASSEl_fE OUT 07 SLOW 14 FAST FORWARD
01 STANDBY 08 PLAY 15 REWIND
02 STOP 09 REC 16 VIDEO INSERT
03 STILL 10 AUDIO DUBBING 17 VIDEO INSERT-PAUSE
04 REC-PAUSE 11 X2 SPEED PLAY 18 AUDIONIDEO INSERT
05 AUDIO DUBBING-PAUSE 12 CUE 19 REVERSE X2 SPEED PLAY
06 FRAME ADVANCE 13 REVIEW 99 OTHERS
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 first digit of 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
I
Head output drop warning display (Tape ‘counter”1 st digit of Minutes.” position)
–3-

.. -—- ~._, _——..—-..,.
Warning
:aasette Used Envelope Detection Output Voltage
Display Main Cause
Envelope detec- 4V ...................................
Cassette tion output
(IC301 Pin 25 or
with normal R3032Markside:
playback – see Fig.2-1-1) OV &+’’-’g’v Z::z:
output Switching pulse normal
(TP183: see Fig. CH-1 CH-2
2-l-2)
Envelopedetec- Av ----------------------------------- When the output voltage differ-
tionoutput
(IC301 Pin25 or
R3032Markside:
“L”blinking see Fig.2-l-1) ov kG:::han gp:g;e;;:
Switching pulse
(TPl 83: see Fig. CH-1 CH-2 ●One video head is clogged
Recorded 2-l-2) ●One video head has worn out
cassette
(with tabs) When the average output volt-
Envelopedetec- 4V -----------------------------------
tionoutput
(IC301 Pin 25 or
R3032Markside:
“L”blinking see Fig.2-l-1) ov ~,,,t’an ‘?:5:;:;:;
Switching pulse
(TP183: see Fig. CH-1 CH-2 ●Both video heads are clogged
2-l-2) ●Both video heads have worn
out
Envelope detec- Av -----------------------------------
tionoutput
(IC301 Pin 25 or
“L”blinking R3032Markside
Rental ‘ee ‘g 2-’-’) Ov &EI~:$Jhan :;:g:d
Switching pulse
cassette (TP183: see Fig. CH-1 CH-2 ●One video head is clogged
(without tabs) 2-l-2) ●One video head has worn out
cSome 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.
3. Cylinder rotation accumulated time display
●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” 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.
9--- ,,, ----
Display panel Ill II IIJ
L(:I :l:l’’:’” L!L
IA
1
Cylinder rotation accumulated display (Tape counter “Hours” display)
-4-

1. DISASSEMBLY
%& 1-1.REMOVAL OF CABINET, MECHANISM UNIT, AND MAIN BOARD
REMOVING THE CABINET PARTS (Fig. l-l-l) 1. Spread out the lock clamps (C) in the arrow direction
1.
2.
Remove the cabinet and bottom cover by removing the four slightly and remove the TM-1 PWB as shown in Fig. 1-1-2.
screws @and four screws@. 2. Remove the screw@ at the chassis.
Remove the front panel by removing the locks of the clamps 3. Remove the screw@ in the chassis, the screw@, and the
(A) using ascrewdriver, etc. and slightly rotating the bottom holder in this order.
part in the direction of the arrow. 4. Remove the two screws ~and two screws @of the
mechanism unit. The two screws @of the cassette tray can
Notes: ●Electrical adjustments for the this model can be be removed easily by pushing the tray lock lever in the
performed with only the cabinet removed. arrow direction to remove the lock as shown in the enlarge
●When replacing the bottom cover, do not tighten the view Aand by pushing the lid opener lever in the arrow
screws @too much. Excess tightness may damage direction to remove the lock as shown in the enlarge view
the screws taps on the chassis, B.
5. Lift up the whole mechanism unit and main board (CP-1
REMOVING THE MECHANISM MAIN UNIT AND THE PWB assembly), and as shown in Fig. 1-1-3, push the two
CP-1 PWB ASSEMBLY (Fig. 1-1-2 and l-l-3) lock clamps (D) of the chassis in the arrow direction so that
~After removing the cabinet parts, remove the mechanism unit they can be removed from the chassis.
and the CP-1 PWB assembly connected as follows.
L-
b-
M-AP21JE-l
Front PanelIUnit
ver
@&
Fig. 1-1-1
–5-

M-PF2LrvrA-2
Tray LockLever
B
CassetteTray Fig. 1-1-2
M-PF2LIWA-3
PWBAssembly
T
Chassis
Fig. 1-14
-
-6-

1-2. TEMPORARILY SEITING 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 TM-1 PWB or the
L
L
‘L
awhole on aflat surface with foil side of the main board remote control.
facing up.
M-PF2LNflA-4 CP-1 PWB Assembly (Fo{l side)
TM-1
vMechan&m Main Unit Fig. 1-1-4
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.
1
M-AA4HICI%?-5 Jutted part of
Cassette Ho
Front
(Position B) Fig. 1-1-5
–7–

1-4. CIRCUIT BOARD LOCATIONS
L-AP2HN/A2, MP4HN/E3, AP4HN/A, AP2HN/Nz
vHR-850 (Australia) ~l~ej~Rk Conv.)
TN-3 PWB ,Afp”lpwBAssemb”
\
r~
o\
[
CP-I PWB
VHR-850 (New Zealand) TM-1 PWB
T.-5p~;KF>\ 4<:””””
~%
vTN-3
PWB
mbly
-.. ,. ..,., -
TM-1PwB- \w/ (T.ner/lF/HF umv., ,,1= >
VHR-870 (New Zealand)
VHR-890 (New Zealand) /
TN-5
w--w’
TM-2 PWB-
TM-lpwB~\? ~-~/
w
-----
—,
“%./
–8-

2. ELECTRICAL ADJUSTMENT
L. VCR PRESETTING
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 MENWTV button directly before prevent auto tuning
will starl.
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.”
U“ 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 buttons (-F) and (–) 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-O023 :SP mode, monoscope, 6KHz
Blank Tape VHS-type cassette tape
Monitor TV
2-1-2. LOCATION OF ADJUSTMENT POINTS
L
L
P12000B
TP101 :L
o
D’
1VR351
:...
:0’:
..../ no on
CP-1 PWB (Foil side) Fig. 2-1-1
-9-

P663C4D TP183 TI
(SW-P) (E
b—k
●@
1
VP-1 PWB Assembly
182
Iv.)
Fig. 2-1-2
2-1-3. SWITCHING POSITION ADJ.
Measuring Point Measuring Equipment Adj. Condition
TP101 Oscilloscope PLAY (SP) mode
(VIDEO OUT) Alignment tape
TP183 (SW-P) (VHJ-0009 or
VHJ-0023)
Adj. Location Adj. Value
VR351 (SW-P) 6.51-1 k0.5 H
1. Play back the alignment tape.
2. Set the tracking control position to the center by pressing
CHANNEL buttons (-l-) and (–) simultaneously.
3. Adjust VR351 (SW-P) so that the width of “T” becomes 6.5
H~0.5 Has siown in Fig. 2-1-3.
IWS-SWP
1- T=6.5H tO.5H
lH 0.5H i
I I Front edge of
venical sync signal
!t
Rise RF. SW. PULSE
1- Fig. 2-1-3
-
–lo-