Service manual

6-4

VL-H870U

VL-H875U

VL-H890U

VL-H870U

VL-H875U

VL-H890U

6-3-2-3. Battery shut-off voltage adjusting method

1) Supply power to the main unit, using the variable-voltage DC power supply (range of 2.5V to 5V).

2) Set the CAM/OFF/VCR SW to CAM to switch to the camera mode.

3) Load a recordable tape and set the main unit to CAM REC. PAUSE.

4) Set the main unit to TEST mode No. 3, and start recording.

5) Measure voltage between TL901(+) and TL903(GND), and adjust the supply voltage to 3V.

6) The adjustment is complete if "BATTERY" is displayed on the monitor screen for a second when the PLAY key of operation unit

is pressed.

7) The adjustment is regarded as proper if the auto shut-off is actuated after the warning is displayed when the TEST mode is

cancelled.

* In case of automatic adjustment of shut-off voltage, adjustment is impossible if voltage is above 3V ± 0.2V.

If the adjustment is made at 2.9V or below, the low-voltage operation may become unstable.

•Type of test modes

To adjust the camera section of this machine, the remote control for servicing (RRMCG0033TASA) is used.

Press the "CONTINUE" key → "TEST SEL", this will show [T-01] on the LCD OSD, (01:flashing), and select the below TEST No. with

"FF" or :REW" key and set with "PLAY" key.

Same procedures of adjustment from now on.

Use the SW2 thru SW9 switches on the adjustment tool to select the following test modes.

TEST No. Title

Contents

Sensor on/off

1 Sensors off All sensors but the cassette controller switch, dew sensor and

battery sensor stay off.

2 Mechanism adjustment 1 Automatic SP/LP detection prohibited All sensors on

mode 2 Different-mode detection prohibited

3 ATF sampling limited to center

3 Automatic battery sensor Battery sensor’s input voltage put in memory.

adjustment

4 Error display Past errors appear on the counter display of the viewfinder. All sensors on

Battery adjustment error Battery sensor’s adjustment errors are displayed at the right of the All but sensors

display “past errors” area. on

5 PASS mode Track shift mode (1/4 shift) All sensors on

6 Camera adjustment mode Camera adjustment mode [VCR

interrupted]

7 VCR adjustment mode VCR adjustment mode

8 Automatic switching point Play standard tape and call this mode. Switching point is

adjustment (STOP ADJ) automatically adjusted.

1 When the battery adjustment mode is selected from the camera adjustment mode with a cassette with the erase protection tab,

the VCR is automatically put in the REC mode.