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VS-840/840S
8: Fader Check (incl. Track Cue)
Turn the potentiometers - faders 1 through 7/8, TRACK CUE 1
through 7/8 from minimum level to maximum level, one by one as
indicated on the LCD.
When all potentiometers pass the test, the program displays "OK"
and proceeds to the test 9.
9: MIDI Check
Connect MIDI IN and OUT through a MIDI cable. The test data is
automatically verified.
The program will display "OK" and proceed to the test 10.
10: SCSI Check (skip if VS-840)
Insert a blank ZIP DISK (for test) into the ZIP drive ( ID No.6, ZIP-
EXT-1S/2S ) and then connect the drive to SCSI IF connector.
The program starts data verification.
After verification, the program displays "OK" and proceeds to the test
11.
11: Audio Check
Note: First read through procedures in this test to minimize repetition
of steps.
Set an audio generator: 200 Hz, rectangular, 1.5 Vpp.
Set INPUT SENS to +4 dBm; CH and MASTER faders to "0
dB".
Input the signal to INPUT sockets 1, 2, 3 and 4 one by one and
observe the signal at the corresponding OUT socket on an
oscilloscope.
Verify that:
Signal at MASTER OUT L and R are identical to that on INPUT
3 and 4, respectively.
Signal at MON/AUX A and B are identical to that on INPUT 1
and 2, respectively.
Repeat the above steps but set the generator frequency at 500
Hz.
Note: INPUT 1 and GUITAR IN (high Z) are internally connected in
parallel with INPUT 1 given priority over GUITAR IN.
INPUT 3 and 4 are internally connected in parallel with pin socket
with the standard socket given priority over pin socket.
. Check the following with MUTE OFF/PHONES (AUX).
INPUT SENS: While monitoring output, turn INPUT SENS knob fully
CW and CCW and verify smooth peak level change.
Verify that AUX signal is sent to PHONES output. Turning PHONES
knob CW and CCW, verify smooth level change.
PEAK LED
Check that the LED turns on at around the middle of INPUT SENS
travel range.
Press REC button.
MUTE OFF/PHONES (MST)
Insert headphones and verify that the master signal is sent to the
PHONES out.
8
. Check Residual noise
Set the product:
INPUT SENS: +4dBm
CH SELECT: INPUT (orange)
INPUT CH: Open
Connect an appropriate noise metering instrument e.g. noise meter
to the corresponding OUT: MASTER R and L, MONI/AUX A
and B.
With the meter connected to one of the OUTs specified above, verify
that meter readings are less than -87 dBm (IHF-A).
Repeat noise reading for the OUT: MASTER R and L, MONI/AUX A
and B.
Press REC button.
MUTE ON/PHONES (MST)
Verify that the signal indicated on the LCD is muted.
Exiting the test program
Simply turn off VS-840.
Turn on VS-840. It should start with the opening screen and necessary
startup information.
Checking in operation mode
Checking ZIP drive
Insert the Demo ZIP DISK ( P/No. 71017756 ) into VS-840 ZIP drive
,and play the Demo Song.
Checking VARI PITCH
Press SHIFT and VARI PITCH buttons. Turning TIM/VALUE dial and
verify pitch change.
Checking ZIP DISK injection
Stop the test disk. Press the ZIP drive inject button and remove the ZIP
DISK.
This completes the tests in this section.
SAVING USER DATA & RELOADING SAVED DATA
Prepare a Blank ZIP DISK ( P/No. 01343023 ) formatted by VS-840.
Before troubleshooting, back up user data onto the ZIP DISK, and
reload the saved data afterward by following the procedure
below.
Saving user area data backup file
1. Holding down PLAY, REC and TRK3 buttons, turn on VS-840.
2. The LCD will display the message "User FILE Wr?" Insert the ZIP
DISK into the drive and then press YES button. The backup file will
be created on the disk. Remove the disk.
Loading user area data backup file
1. After completing troubleshooting (e.g. replacement of a PCB), insert
the ZIP DISK and then turn on VS-840.
2. The LCD will display the message "User Area Load?". Press YES
button to load the backup data.
Mar, 1998
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