Sanyo VHR-590 User manual

FILE NO.
SERVICE MANUAL Siiiqphf
o
Video Cassette Recorder VHR-590
(Australia,NewZealand)
CONTENTS
SELF-DIAGNOSIS DISPLAY ............................ 2
l. DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...5
2. ELECTRICAL ADJUSTMENT. ........................9
3. TEST POINTS FOR TAPE PATH ADJUSTMENT ....... 16 Please see other materials with Reference No.
4. PARTS LIST given in table below.
.ACCESSORIES ................................... 17
PACKING MATERIALS ............................. 17
CABINET &CHASSIS PARTS... .................... 17
Materials Model No. Reference No.
Mechanism V95 I
Manual Mechanism MM531433
II
MECHANISM PARTS .............................. 18 iI
ELECTRICAL PARTS ..............................20
CIRCUIT DIAGRAMS (Refer to the separate volume)
~“0”””“’”y ‘“T’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 parts maybe supplied as the service parts.
3. N.S.PJ Not availableas service parts. ,, :>,.,*,.,
Design and specifications are subject to change without notice. .!,! l’ff!lA
PP4H/A, NZ 143155 35,36 REFERENCE No. SM531469

MechanismMode Display/HeadOutput Drop Warning Display/CylinderRotationAccumulated
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 “L” sign will be blinked. Some models (listed later) will also dispiaythe cylinder
rotation accumulated time.
These display shows the outline of the problems. Use it as areference when servicing the unit.
1.Self-DiagnosisContentsand MechanismMode 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 3seconds 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.
L‘;’’’’:’:
-w
Ill i{“””’”””?~~ng
,:::
Display panel
L! 2HI
00
II
Self-Diagnosis number Mechanism mode number
(Reception channel display) (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 STOP mode.
01 ●The control of the cylinder motor is
faulty.
●The tape winds around the cylinder.
The take-up reel does not rotate.
02 .The take-up reel is caught. Shifts to the STOP mode.
.The reel belt is faulty.
.The take-up torque has decreased.
The capstan motor does not rotate. .The capstan motor is faulty.
03 Shifts to the STOP mode.
.Tha control of the capstan motor is
faulty.
The tape cannot be loaded with the ●Error in the operations of tha tape Unloads, shifts to the INITIAL mode,
cassette inserted. loading mechanism,
(But unloading can be performed.) and the power goes off.
.Foreign particles in the tape Ioad-ing
04 mechanism.
●The tape end sensor is faulty.
●The reel brake of the tape cassette
has not been released.
Tape loading and unloading cannot be ●The tape guide is caught. The power isforcibly turned off with the
05 performed with the cassette inserted. ●The loading motor is faulty. mechanism at its current position.
●The control of the loading motor is
faulty.
–2–

L
15502(1 1D2
No.
06
07
08
09
Problem
Front unloading cannot be performed
whan ejecting the cassette.
(Front loading can be performed.)
Front loading and front unloading
cannot be performed when ejecting
the cassefie.
The mechanism becomes 1(REVIEW)
while moving from 2(IDLER), 3(STILL),
4(BRAKE), and to 5(STOP).
The mechanism becomes 7(INITIAL)
while moving from 1(REVIEW), 2
(IDLER), 3(STILL), 4(BRAKE), and to
5(STOP),
Main Possible Cause
oThe cassette drive mechanism is
faulty.
●The front door is caught.
●The tape cassette is caught in the
cassette drive mechanism.
●The main cam and front rack gear of
the front loading mechanism have
not engaged properly.
●The gears of the front loading
drive mechanism have not en-
gaged properly.
●The mechanism mode switch con-
tact is faulty.
●The mechanism mode switch con-
tact is faulty.
Mechanism Operations and
State After Occurrence
Front loads and shifts to the STOP or
INITIAL mode.
.When the power switch is turned on
before eject operations: Shifts to the
STOP mode.
.When the power switch is turned off
before eject operations: Shifts to the
INITIAL mode and the power goes
off.
The power is forcibly turned off with
the mechanism at its current position.
The power is forcibly turned off with
the mechanism at its current position.
Carries out tape take-up operations,
shifts to the INITIAL mode, and the
power goes off.
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 Display Contents
Mode No. Mechanism Mode Mode No. Mechanism Mode Mode No. Mechanism Mode
00 CASSETTE OUT 08 PLAY 16 VIDEO INSERT
01 STANDBY 09 REC 17 VIDEO INSERT -PAUSE
02 STOP 10 AUDIO DUBBING 18 AUDIO/VIDEO INSERT
03 STILL 11 X2 SPEED PLAY 19 REVERSE X2 SPEED PLAY
04 REC-PAUSE 12 CUE
05 AUDIO DUBBING -PAUSE 13 REVIEW
06 FRAME ADVANCE 14 FAST FORWARD
07 SLOW 15 REWIND 99 OTHERS
1-
2. HeadOutput DropWarning 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 ameans to judge the abnormality.
- - ,...,: ,j..’...,
Display panel Itl ““ I:.,, 1~ J
L! J~...i ,;........!‘L :~“’lJ ll_
IAI
I
Head output drop warning display
(Tape counter “lst digit of Minutes.” position)
–3–

15S01(N) D3
Head playback output voltage check
Warning
iassette Used Display Envelope Detection Output Voltage Main Cause
Envelope detec- lv -----------------------------------
Cassette tion output
with (IC301 Pin 25 or
normal C3016 HOT side:
see Fig. 2-l-1) OV k+05-095v g:~::::z
playback Switching pulse
output (TP1 83: see Fig. CH-I CH-2
2-l-2)
Envelope detec- 4V -----------------------------------
tion output
dt~” (IC301 Pin 25 or
C3016 HOT side:
blinking see Fig. 2-l-1) OV k~~:~than ‘::E=:::
Switching pulse been performed accurately
(TF’1 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) Envelope detec- 4V ----------------------------------- When the average output voltage
tion output
&05v
of the two channels is less than
“L” (lC301 Pin 25 or
C3016 HOT side:
blinking ~Less than ●Tracking adjustment has not
see Fig. 2-l-1) OV t0.5V been performed accurately
Switching pulse
(TPI 83: see Fig. CH-1 CH-2 ●Both video heads are clogged
2-l-2) ●Both video heads have worn
out
Envelope detec- 4V -----------------------------------
tion output
,, ,,
L(IC301 Pin 25 or
Rental C3016 HOT side:
blinking see Fig. 2-l-1) OV +Cr::than %:E:::
cassette Switching pulse been performed accurately
(Without (TP183: see Fig. CH-1 CH-2 ●One video head is clogged
tabs) 2-l-2) ●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 may be less than 0.5V for some, no warning displays
will be shown.
3. Cylinderrotationaccumulatedtime displayOnly VHR-795E,VHR-775Eemploysthisfunction
(However,thisfunctionwillbe equippedonlyfrom the middleof produti”on.
.
.
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 3seconds for 3,300 to 3,399 hours.)
To erase the cylinder rotation accumulated time display, press the RESET button on the remote control during the
accumulated time display.
Cylinder rotation accumulated display (Tape counter “Hours” display)
–4–

y15501(N) Ml
1. DISASSEMBLY
1-1.REMOVAL OF CABINET,MECHANISM UNIT,AND MAIN BOARD
REMOVING THE CABINET PARTS (Fig. 1-1-1 )2. Remove the screw@) at the back of the chassis.
1. Remove the cabinet and bottom cover by removing the 3. Remove the red screw@ in the chassis, remove the red
four screws ~and four screws@. screw @, and remove the holder in this order.
2. Remove the front panel by removing the locks of the 4. Remove the two screws@ and two screws@) of the
clamps (A) using ascrewdriver, etc. and slightly rotating mechanism unit. The two screws (@ of the cassette tray
the bottom part in the direction of the arrow. can be removed easily by pushing the tray lock lever in
Notes: ●Electrical adjustments for the this model can be the arrow direction to remove the lock as shown in the
performed with only the cabinet removed. enlarge view Aand by pushing the lid opener lever in
●When replacing the bottom cover, do not tighten the arrow direction to remove the lock as shown in the
the screws @too much. Excess tightness may enlarge view B.
damage the screw taps on the chassis. 5. Lift up the whole mechanism unit and main board (CP-I
PWB assembly), and as shown in Fig. 1-1-3, push the two
REMOVING THE MECHANISM MAIN UNIT AND THE lock clam~s (D) of the chassis in the arrow direction so
CP-1 PWB ASSEMBLY (Fig.1-l-2 and l-l-3) that they can be removed from the chassis.
After removing the cabinet parts, remove the mechanism
unit and the CP-I PWB assembly connected as follows.
1. First, remove the red screw@ of the TB-2 PWB, spread
M-PP4HIG-1
Fig.1-1-1
out the lock clamps (B) and (C) in the arrow direction
slightly and remove the TB-2 PWB and TM-1 PWB as
shown in Fig. 1-1-2.
-5–

15501(N) M2
M-PP4HIG 2
Tray Lock Lever
B
Fig.
1-1-2
M-PP4tVG-3
TB-2
PWB Assembly
Chassis
Fig. 1-1-3
-—
–/
-
–6–

r15502(1) M3
1-2.TEMPORARILYSEITING UPAND CONNECTINGCP-1PWB 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 2. Operate the unit using the buttons on TM-1 PWB or the
as awhole on aflat surface with the foil side of the main remote control.
board facing up.
L
-
‘L
M-PP4HIG-4
TM-1
CP-I PWB Assembly (Foil side)
\
s
Pw
c
\
Mechanism Main Unit Fig.1-1-4
1-3.INSTALLATIONOF THEFRONTPANEL
When installing the front panel to the chassis aller repaires and adjustments.
1. Pressing down the door opener lever of the mechanism Note: Opened cassette door position does not install the
main unit. front panel to the chassis.
2. Set the cassette door to half-opened state as shown in
Fig.1-l-5, and install the front panel to the chassis.
M-PP4H/G-5
;Ut&dg
Front Pa
(Position A) Cass~tte Door
(Position B) Fig. 1-1-5
–7–

1553s(N) L1
1-4.MAIN CIRCUITBOARD LOCATIONS
L-PP4WG
AD-1 PWB \
~VP-1 PWB Assembly
3in 1Tuner
(Tuner/lF/RF Converter)
TN-3 PWB (Australia)
TB-2 PWB
~lpWB>~ PW-IPWB

15601(N) S1
2. ELECTRICALADJUSTMENT
VCR PRESElllNG
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 MENU/TV button directly before prevent auto
tuning will start.
When steps 1to 3have been finish, ready to operate the all operating mode.
2-1.SERVOCIRCUITADJUSTMENT
.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 deviate
the tracking center set Be sure to press the channel buttons (+) or (-) several times directly after starting playback to prevent
Lauto-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
L
“L
P36200E1S
*
O;---,CJ
1:
.....
CN352
ICI 02 D
Power
supply eTpl~~
Pari ............
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1
,-, 48
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Q
37
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:(....; ,
, .... ,
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~:
::
,:
-
PIC301 ‘:;;og4 :,
! [TN-3
~, ~o
E@EEl [~ ::pwB
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AD-5 ~: ; ~h
.............!
................. PWB :: ;-j;,
L.....---...>- PWB IC602
:-...4-? ~~ $631
~%i!ian ~
~:
!. ...;
on u[SEPARATION
1
iJ1JLI
CP-1 PWB (Foil side) Fig. 2-1-1
–9-

15s01(N) S2
lli%u
IP3SOOC1S -TP183 m
Shield cas
VP-1 PWB Assembly Fig. 2-1-2
Note:
.Self-recording means “Record any broadcasting or video
signal and play back the just-recorded portion. ”
2-1-3. SWITCHING POSITIONADJ.
\Meesuring Point [Meesuring Equipment IAdj. Condition I
TPIOI Oscilloscope PLAY mode
(VIDEO OUT) Alignmenttape
TP183 (SW-P) (VHJ41009 or
VHJ-0023)
Adj. Locetion Adj. Value
IVR351 (SW-P) 16.5 H*0.5H I
1. Play back the alignment tape.
2. Set the tracking control position to the center by pressing
CHANNEL buttons (+) and (-) simultaneously.
Note: To set tracking to center accurately, press the two
CHANNEL buttons together.
3. Adjust VR351 (SW-P) so that the width of “T” becomes
6.5 H*0.5 Has shown in Fig. 2-1-3.
WS-SWP
IFront edge of’
vertical sync signal
J!t
Rise RF. SW. PULSE Fig. 2-1-3
2-1-4. SLOW TRAKCING ADJ.
Meesuring Point
Picture of
monitor TV
Vleesuring Equipment
Color bar generator
or
broadcasting monitor
Adj. Condition
Self-recording
(SP mode)
SLOW mode
Blank tape
----—--——.
Self-recording
(LP mode)
SLOW mode
Blank tape
Adj. Location Adj. Value
CHANNEL (+) button
CHANNEL (-) button
1. Set the tracking control to the center position by press
ing CHANNEL buttons (+) and (-) simultaneously.
2. Play back the self-recorded pottion and set the VCR in the
SLOW mode with the remote control unit.
3. Confirm that there is no noise on the slow playback
display.
4. Press the CHANNEL button (+) about three times and
check that noise dose not appear at the upper part of
the display.
5. Adjust the tracking control to the center again.
6. Press the CHANNEL button (-) the same number of
times as in the step 4(about three times) and check that
noise dose not appear at the lower part of the display.
Note
●CHANNEL button also servers as TRACKING button.
–lo–
----