Sharp VL-H870U, Руководство по обслуживанию

Страница: 25 / 148

6-1
VL-H870U
VL-H875U
VL-H890U
VL-H870U
VL-H875U
VL-H890U
6. ADJUSTMENT OF VCR AND CAMERA
6-1. INITIAL SETTING OF E
2
PROM IC
6-1-1. E
2
PROM data alterable ways
1) Set the switch of main body to CAM, and use the remote control (RRMCG0033TASA) for adjustment to turn on the adjustment
mode.
2) VCR adjustment address setting.
V ADJ
0000
“0000” is blinking
After an objective address was established, play key is pushed and set.
In addition, numerical change uses a “REW” or “FF” key.
3) VCR adjustment data setting.
V ADJ
0000 ##
Value of “##” differs by an address.
After an objective data was established, “PLAY” key is pushed and set.
4) When data of other address are changed successively, push “STOP” key, and please repeat operation to 5) from 3).
5) When SW of the substance is turned into off, data are written to E
2
PROM from systematic microcomputer.
6-3. ADJUSTMENT OF VCR SECTION
6-3-1. Before starting the electric circuit adjustment
•
Electric circuit adjustment becomes necessary, in most cases, when any of the wear mechanical parts or the video head has been
replaced. Before starting the electric circuit adjustment, be sure to check that the mechanical parts work well (i.e., the mechanical
parts have all been perfectly adjusted). In case a trouble or troubles are found in the electric circuitry, be sure to pinpoint the cause(s)
by using the measuring instruments described below. After locating the trouble spot(s), then proceed to repair, replacement or
adjustment. Do not change the positions of the controls when adequate measuring instruments are not available.
•
In order to implement a higher-density, smaller machine, most of the electric circuit parts used on the Circuit Boards are of small-
sized, surface-mounted type. For replacing part(s) as after-sales service, work with a soldering iron as speedily as possible. The
heat resistance of the surface-mounted components is poor, when compared with the larger-sized discrete parts used for television
sets and stationary decks, owning to their small sizes. Therefore, exercise due care to avoid long-time exposure of the pins of these
parts to the heat of the soldering iron which may possibly damage them. Such care should be exercised especially for chip-layer
capacitor replacement. It is advisable to use a temperature-controlled ceramic soldering iron (temperature at the tip: 250
°
C,
contacting time: less than 5 seconds).
6-2. ADJUSTING THE Y/C, AUDIO AND LCD CIRCUITS ON MODELS WITHOUT A/V IN MODE
(A/V IN MODE SET-UP PRODUCE)
1) Set the switch of main body to CAM, and use the remote control (RRMCG0033TASA) for adjustment to turn on the adjustment
mode.
2) Set up the adjustment address (example : EE mode adjustment address 14). Once this address has been set up, the A/V IN mode (test
mode) is automatically brought and the images appear on the LCD display.
3) Now make the adjustments referring to the instruotions in the manual.
6-1-2. IC703 (E 2 PROM)
When the IC703 has been replaced, make the following settings and
adjustments.
1. Remove the backup battery (CR2025).
2. Turn power switch to CAMERA.
3. Setting up the V ADJ mode as follows.
*
After press the CONTINUE key, press the VCR ADJ key on service
remote control (RRMCG0033TASA).
4. After setting the above data, clear the V ADJ mode and turn off the power
by pull out the battery pack or DC cable.
Neglect about 30 seconds after turned of power, because data of
address becomes effective after microcomputer is reset.
Now the setting of data is completion.
Adjustments to follow
Make the system controller servo, VCR, and LCD adjustments according
to their respective instructions.
6-1-3. Camera adjustment
When the IC2 has been replaced, make the camera adjustment according
to its instructions.
All the camera adjustment data are written in the E
2 PROM provided on
the lens unit. Therefore, when the lens is replaced, the camera must be
adjusted again according to the camera adjusting procedure.
H870U H875U H890U
address data data data
03 (Specificaton code) 48 4F 4A
02 (Country code) 01 01 01