VC-MH85 (serv.man4). Trouble shooting guide - Sharp VCR Service Manual (repair manual). Page 13

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 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), located at the front side on the main PWB.

Be sure that all the display 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

display, 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.

d. 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.

JP27 JP26 JP25 JP24

1

1

0

0

↓

C

JP23 JP22 JP21 JP20

0

0

0

0

↓

0

JP19 JP18 JP17 JP16

0

0

0

0

↓

0

JP15 JP14 JP13 JP12

0

1

0

0

↓

4

JP11 JP10 JP9 JP8

0

0

1

1

↓

3

JP7 JP6 JP5 JP4

0

0

0

0

↓

0

JP3 JP2 JP1 JP0

0

0

0

0

↓

0

Also recording level preset number selected from the ten keys on the remote control unit which appear in the
LCD display, referring to the E

2

PROM  map.

JP39 JP38 JP37 JP36

0

0

0

0

↓

0

JP35 JP34 JP33 JP32

0

0

0

1

↓

1

JP31 JP30 JP29 JP28

0

0

0

0

↓

0

SP     n

∗

∗

↑

selection from the 
ten keys.
(from "0" to "7")

EP     n

∗

∗

↑

selection from the 
ten keys.
(from "0" to "7")

Out lights

blank

SP     p

∗

∗

↑

selection from the 
ten keys.
(from "0" to "7")

LP     p

∗

∗

↑

selection from the 
ten keys.
(from "0" to "7")

2. Memory recording preset level reprogramming.

a. Similarly to the above step 1-a  and 1-b 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 LCD display, referring to the E

2

PROM map.

3. Example :

System

p : PAL
n : NTSC

↓

 Tape speed

→

LP or EP

n

∗

∗

        

↑

↑

                   

        

Chrominance preset number. (from "0" to "7")                    

       

Luminance preset number. (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.

↑

↑

↑

↑