46
DV-NC65H/S
DV-NC70H
REPLACEMENT OF IC710 (E
2
PROM)
<<Servicing precautions>>
When the IC710 (E
2
PROM) has replaced, make the following reprogramming.
Depending on models, the IC710 (E
2
PROM) has been factory adjusted for its memory function.
It's therefore necessary to reprogram the memory function for the model in question.
Note that the servo circuit requires readjustments for the slow and still modes.
1. Memory function reprogramming.
a. Check the power off. (Power is standby mode.)
b. Make for moment short-circuit test point (TP801 and TP803), located at the VCR Operation PWB.
Be sure that all the VCR displays light up into the TEST mode.
c. Using the CHANNEL (+) and (-) buttons, select the right function numbers from JP0 to JP39, which appear in the VCR
LCD display, referring to the E
2
PROM map.
Press the DISPLAY button to pickup the fuctions (ON) and the CLEAR button to discard the functions (OFF).
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.
d. Example: "ON" and "OFF" are taken as "1" and "0" respectedly.
The numbers JP0 to JP39 are divided into four groups and each group's setting is displayed in hexadecimal notation.
Also recording level preset number selected from the ten keys on the remote control unit which appear in the VCR LCD display,
referring to the E
2
PROM map.
2. Memory recording preset level reprogramming.
a. Similarly to the above step 1-a and 1-d the same operate.
b. Using the CHANNEL (+) and (-) buttons, select the right function numbers continued from recording preset number as has been
JP0~JP39, which appear in the VCR LCD display, referring to the E
2
PROM map.
c. Example:
3. Finally make for a moment short-circuit test point (TP801 and TP803), both located at the VCR Operation PWB to clear the TEST
mode.
JP0 JP1 JP2 JP3 JP4 JP5 JP6 JP7 JP8 JP9 JP10 JP11 JP12 JP13 JP14 JP15 JP16 JP17 JP18 JP19 JP20 JP21 JP22 JP23 JP24 JP25 JP26 JP27
0010010011011101111001111010
↓↓↓↓↓↓↓
42BB7E5
JP28 JP29 JP30 JP31 JP32 JP33 JP34 JP35 JP36 JP37 JP38 JP39
010001001100
↓↓↓
223
Out lights SP p * *LPp * *SPn * *EPn * *
↑↑ ↑↑ ↑↑ ↑↑
Blank Selection from the Selection from the Selection from the Selection from the
ten keys. ten keys. ten keys. ten keys.
(from "0" to "7") (from "0" to "7"). (from "0" to "7") (from "0" to "7")
System p : PAL
↓ n : NTSC
Tape speed → SP, LP or EP n
* *
↑↑
Chrominance preset number. (from "0" to "7")
Luminance preset number. (from "0" to "7")
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