Read Sharp VC-M303 (serv.man9) Service Manual online
46
REPLACEMENT OF IC705(E
2
PROM)
Servicing precautions
When the IC705(E
2
PROM) has been replaced, make the following reprogramming.
Depending on models, the IC705(E
2
PROM) has been factory adjusted for it’s memory function.
It’s therefor necessary to reprogram the memory function for the model in question.
Note that the servo circuit requires readjustments for the slow and still modes.
Note that the servo circuit requires readjustments for the slow and still modes.
1. Memory function reprogramming.
1. Check the power off.(Power is standby mode)
2. Make for moment short-circuit test point(P802), located at the front side on the main PWB.
2. Make for moment short-circuit test point(P802), located at the front side on the main PWB.
Be sure that all the fluorescent display tube light up into the TEST mode.
3. Using the CHANNEL(+) AND (–) buttons, select the right function numbers from JP0 to J39, which appear in the
fluorescent display tube, referring to the E
2
PROM map.
Press the DISPLAY button to pickup the functions(ON) and the CLEAR button to discard the functions(OFF).
DISPLAY and CLEAR buttons, are located on the remote control unit.
DISPLAY and CLEAR buttons, are located on the remote control unit.
∗ when the DISPLAY button has been pressed (ON), the memory function number starts flashing.
∗ when the CLEAR button has been pressed (OFF), the memory function number lights up.
4. Press the FF button on the remote control unit.
By doing, lower 7 of the 10 digits are displayed in hexadecimal notation.
5. Similarly to the above step 4, press the STOP button on the remote control unit.
By doing, upper 3 of the 10 digits are displayed in hexadecimal notation.
6. Example : "ON" and "OFF" are taken as "1" and "0" respectively.
The numbers JP0 to JP39 are divided into four groups and each group’s setting is displayed in hexadecimal notation.
1 When the press the FF button on the remote control unit.
1 When the press the FF button on the remote control unit.
By doing, lower 7 of the 10 digits are displayed in hexadecimal notation.
JP27 JP26 JP25 JP24
1
1
0
0
↓
C
JP23 JP22 JP21 JP20
0
0
0
0
↓
0
0
JP19 JP18 JP17 JP16
0
0
0
0
↓
0
0
JP15 JP14 JP13 JP12
0
1
0
0
↓
4
4
JP11 JP10 JP9 JP8
0
0
1
1
↓
3
3
JP7 JP6 JP5 JP4
0
0
0
0
↓
0
0
JP3 JP2 JP1 JP0
0
0
0
0
↓
0
0
2 When the press the STOP button on the remote control unit.
By doing, upper 3 in the 10 digits are displayed in hexadecimal notation from the feature function.
Also recording level preset number selected from the ten keys on the remote control unit which appear in the fluorescent
display tube, referring to the E
Also recording level preset number selected from the ten keys on the remote control unit which appear in the fluorescent
display tube, referring to the E
2
PROM map.
3 When the press the REW button on the remote control unit.
By doing, recording level preset number selected from the ten keys on the remote control unit which appear in the fluorescent
display tube, referring to the E
display tube, referring to the E
2
PROM map.
Out lights
blank
LP n
∗
∗
↑
selection from the
ten keys.
(from "0" to "7")
ten keys.
(from "0" to "7")
LP n
∗
∗
↑
selection from the
ten keys.
(from "0" to "7")
ten keys.
(from "0" to "7")
SP n
∗
∗
↑
selection from the
ten keys.
(from "0" to "7")
ten keys.
(from "0" to "7")
SP n
∗
∗
↑
selection from the
ten keys.
(from "0" to "7")
ten keys.
(from "0" to "7")
LP p
∗
∗
↑
selection from the
ten keys.
(from "0" to "7")
ten keys.
(from "0" to "7")
LP p
∗
∗
↑
selection from the
ten keys.
(from "0" to "7")
ten keys.
(from "0" to "7")
Out lights
blank
SP p
∗
∗
↑
selection from the
ten keys.
(from "0" to "7")
ten keys.
(from "0" to "7")
SP p
∗
∗
↑
selection from the
ten keys.
(from "0" to "7")
ten keys.
(from "0" to "7")
"0" fixed
displayed
JP39 JP38 JP37 JP36
0
0
0
0
↓
0
0
JP35 JP34 JP33 JP32
0
0
0
0
↓
1
1
JP31 JP30 JP29 JP28
0
0
0
0
↓
0
0
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