VC-M312HM (serv.man6). Simplified EEPROM programming method - Sharp VCR Technical Bulletin (repair manual)

vc-m312hm (serv.man6) technical bulletin
Model
VC-M312HM (serv.man6)
Pages
2 Few pages! See other manuals at the bottom of the first or last page.
Size
24.5 KB
Type
PDF
Document
Technical Bulletin
Brand
Device
VCR / Simplified EEPROM programming method
File
vc-m312hm-sm6.pdf
Date

Read Sharp VC-M312HM (serv.man6) Technical Bulletin online

VCR2001 08 01
Month of Issue:  
May 2003
        
Classification: 
White
VIDEO TECHNICAL BULLETIN
Page 1 of 2
Sharp Electronics (UK) Limited
Reference AVW10 08 2001-3
Revision 2
White – Carry out as required
Yellow – Carry out as required and whenever the unit comes in for service
 Red – Carry out on all units
MODELS
VCM301HM
VCM302HM
VCM311HM
VCM312HM
VCM321HM
VCM522HM
VCMH711HM
VCMH712HM
VCMH713HM
VCMH722HM
VCMH73HM
VCMH732HM
REASON
Simplified EEPROM programming method.
ACTION
Follow the procedure outlined below to reprogram the EEPROM.
EEPROM (IC705) Replacement Procedure
When replacing the EEPROM (IC705) it is necessary to reprogram it, this is because it is supplied
blank, i.e. it contains no data.  Depending upon the model type, the EEPROM will have to be
programmed with different data as follows:
1.  The EEPROM has a number of locations (JP0 to JPxx) that contain data to control the
functionality of the machine, i.e. whether the unit has long play, PDC function etc.  These
locations can only be set to either a ‘1’ or a ‘0’.  As the values contained within the EEPROM
varies between units, a table is provided in the relevant service manual, detailing model
types and JP data.
2.  In addition to the above, the recording preset levels will also have to be entered.
3.  It is also necessary to readjust the servo slow and still modes
How to reprogram the JP locations
First enter the test mode:
1.  Ensure the VCR is in the standby mode.
2.  Connect a shorting link between the pins on test point P802 (see location diagram). When
the link is put on, all the display segments will light up.
3.  Remove the shorting link.  The display will change to JP0; this may be static or flashing.
To move between the JP locations, press the CHANNEL (+) or CHANNEL (-) buttons on the front of
the VCR.  Note that the channel change buttons on the remote control will have no effect.
VCR2001 08 01
Month of Issue:  
May 2003
        
Classification: 
White
VIDEO TECHNICAL BULLETIN
Page 2 of 2
Sharp Electronics (UK) Limited
Reference AVW10 08 2001-3
Revision 2
White – Carry out as required
Yellow – Carry out as required and whenever the unit comes in for service
 Red – Carry out on all units
To change the JP locations to a ‘0’, press the CLEAR button on the remote control (JP number will
be static)
To change the JP locations to a ‘1’, press the DISPLAY button on the remote control (JP number
will flash)
After programming, a quick check can be made to see if the data has been entered correctly.  On
the data table, the row at the bottom indicates a checksum, which can be used for this purpose.  As
this is a ten-figure number it cannot be displayed all at the same time, therefore it has to be done in
two parts.
To display the lower seven digits press the FF button on the remote control.
To display the upper three digits press the STOP button on the remote control.
1.  Enter the test mode as shown above.
2.  Press the CHANNEL (+) or CHANNEL (-) buttons until the tape speed indicator is lit (either
SP, LP or EP).  The display will read either n or p (NTSC or PAL), first digit next to this letter
represents luminance preset number, the second, the chrominance preset level.  See below
sp
P 3
5
Luminance preset level
Tape speed
Chrominance preset level
System
3.  To change the values, press the number keys on the remote control.  In the above example
the keys ‘3’ then ‘5’ would be pressed to give ‘35’.  Note that only numbers 0 to 7 can be
entered.
CHANNEL (-) buttons on the front of the unit to move onto the other levels.
5.  When complete, short-circuit the test point P802 again to exit the test mode.
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