37DM-23H (serv.man28). Details of hotel mode operation — Sharp TV Technical Bulletin (repair manual)

Model
37DM-23H (serv.man28)
Pages
2 Few pages! See other manuals at the bottom of the first or last page.
Size
11.9 KB
Type
PDF
Document
Technical Bulletin
Brand
Device
TV / CTR / Details of hotel mode operation
File
37dm-23h-sm28.pdf
Date

View Sharp 37DM-23H (serv.man28) Technical Bulletin online

Sharp Electronics (UK) Limited    CE Technical Support Group
Originator  
$Y:
$Y:
    Supervisor   
   
     Approval Date       /    /        Reference   GE74000X 
White - Carry out as required      Yellow - Carry out as required and whenever unit comes in for service      Red - Carry out on all units
CTV980201
Month of Issue : February 1998
Classification : 
White
TELEVISION TECHNICAL BULLETIN
Page 1 of 2
MODELS
  37DM23H
  37DT25H
  51DT25H
  
SYMPTOM It is possible to put the above television receivers into a hotel mode to
1.
Lock out the channel tuning function.
2.
Restrict the volume level.
ACTION
To facilitate the hotel mode it is necessary to first enter the service mode as
indicated below.
1.
Ensure that the receiver is on and displaying a picture, then switch it off 
using the mains switch.
2.
Press the volume down button and the channel up button simultaneously.
3.
Whilst still holding down the above buttons, switch the receiver on using the
mains switch.  Continue holding the buttons until the set shows a picture
4.
When the picture appears, the set will be in the service mode, release the
buttons.
To access the NVM memory, press the channel up button on the remote control
until the NVM setting function is reached.  Note that the NVM address is shown
in green and the NVM value is shown in red.
The NVM value is stored in a hexadecimal form, each address comprising of two 
hexadecimal numbers.  Each of these numbers will break down into a four bit binary code.
Hex code
                                       A           5 
Binary code                                                1  0  1  0          0  1  0  1
Button on remote to toggle                        7  6  5  4           3  2  1  0
In the example given above, the hexadecimal code is A5, the binary equivalent is 1010 
0101 and the remote control button to toggle each bit on or off, i.e. a 1 or a 0 is shown 
below the binary code.  Therefore to change this to A6, remote control buttons 1 then 0 
would be pressed.
Sharp Electronics (UK) Limited    CE Technical Support Group
Originator  
$Y:
$Y:
    Supervisor   
   
     Approval Date       /    /        Reference   GE74000X 
White - Carry out as required      Yellow - Carry out as required and whenever unit comes in for service      Red - Carry out on all units
CTV980201
Month of Issue : February 1998
Classification : 
White
TELEVISION TECHNICAL BULLETIN
Page 2 of 2
To block the tuning mode NVM address 0B has to be changed as follows.
Model
Nominal Value
Hotel Value
37DM23H
F8
FC
37DT25H
F8
FC
51DT25H
F8
FC
To set the maximum volume level, change NVM address 0E as follows.
Maximum volume
FF
90% volume ( approximately )
E7 to EF
80% volume ( approximately )
CF to DF
73% volume ( approximately )
BF
62% volume ( approximately )
9F to BF
50% volume ( approximately )
7F
When the hotel mode has been set, turn off the receiver at the mains switch, turn back on
and check all functions.
Page of 2
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Here you can view online or download Sharp 37DM-23H (serv.man28) Technical Bulletin in pdf. This Technical Bulletin can help you recover, restore, fix, disassemble and repair Sharp 37DM-23H (serv.man28) CTR. Information contained in Sharp 37DM-23H (serv.man28) service manual (repair manual) typically includes:

  • Disassembly, troubleshooting, programming, maintenance, remote, adjustment, installation and setup instructions.
  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).