46
VC-TA350/TA351/351W
VC-TA352W/TA355/TA356
REPLACEMENT OF IC710(E
2
PROM)
Servicing precautions
When the IC710(E
2
PROM) has been replaced, make the following reprogramming.
Depending on models, the IC710(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.
1. Memory function reprogramming.
1. Check the power off.(Power is standby mode)
2. Make for moment short-circuit test point (TP801), 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 C) AND (-) buttons, select the right function numbers from JP0ü`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.
∗
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 5 of the 10 digits are displayed in hexadecimal notation.
Example : "ON" and "OFF" are taken as "1" and "0" respectively.
JP19 JP18 JP17 JP16 JP15 JP14 JP13 JP12 JP11 JP10 JP9 JP8 JP7 JP6 JP5 JP4 JP3 JP2 JP1 JP0
0
1
1
0
0
1
1
0
0
0
1
0
0
0
0
1
0
0
1
1
↓
↓
↓
↓
↓
6
6
2
1
3
5. Press the STOP button on the remote control unit.
By doing, upper 5 in the 10 digits are displayed in hexadecimal notation from the feature function.”
Example : "ON" and "OFF" are taken as "1" and "0" respectively.
JP39 JP38 JP37 JP36 JP35 JP34 JP33 JP32 JP31 JP30 JP29 JP28 JP27 JP26 JP25 JP24 JP23 JP22 JP21 JP20
0
0
1
1
0
1
1
0
0
0
0
0
0
0
0
0
1
0
0
0
↓
↓
↓
↓
↓
3
6
0
0
8
2. Memory recording preset level reprogramming.
1. Similarly to the above step 1-1 and 2 the same operate.
2. Using the CHANNEL (+) AND (-) buttons, select the right function numbers continued from recording preset
number as has been <LP p
∗ ∗
to SP p
∗ ∗
>, which appear in the fluorescent display tube, referring to the
E
2
PROM map.
3. 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.
4. Example :
SP or LP
p
∗ ∗
↑
↑ ↑ ↑
Tape speed
Chrominance preset number. (from "0" to "7")
Luminance preset number. (from "0" to "7")
System (p : PAL)
5. When press the REW button on the remote control unit.
By doing, PAL system 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.
LP
p
∗
∗
LP
p
∗
∗
SP
p
∗
∗
SP
p
∗
∗
↑
↑
↑
↑
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")
6. When press the PLAY button on the remote control unit.
By doing, NTSC system 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.
EP
p
∗
∗
EP
p
∗
∗
SP
p
∗
∗
SP
p
∗
∗
↑
↑
↑
↑
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")
3. Finally make for a moment short-circuit test point (TP801), located at the front side on the main PWB to clear the
TEST mode.
