Sony DPS-V55, Service Manual, Page: 11 / 32

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SECTION 4
TEST MODE
[Operation of Test Mode]
• The test mode is executed according to order the following.
• Press
N
button, and come back the before item.
1 Begin the test mode
1) Press
[POWER]
button while Press three buttons
[SYSTEM]
,
[BYPASS]
and N simultaneously.
2) The self-diagnosis is executed and indicated error mes-
sages in case of something wrong a hardware (See [Self-
diagnosis Message]), begin the test mode in case of no
damage.
Display:
2 Key switch and rotary encoder check
1) Press any switch button, and display a figure to button.
Button Display Button Display
n 0 ENTER 4
N
1 SAVE 5
BYPASS 2 SYSTEM 6
Fx TYPE 3 EXIT 7
2) Right down of display value increases like 1, 2, 3...... if
rotating JOG knob in clockwise, or decreases like 0, 9,
8...... if rotating in counter clockwise.
(Limit of figure: 000 to 255)
Display:
3 MIDI circuit check
• Preparation:
The MIDI cable (DIN cable) between MIDI IN connec-
tor and MIDI OUT/THRU connector.
(If not available this check with not connect cable)
1) Press
n
button.
(This check begin with display all figure of switch but-
ton and rotary encoder position.)
2) Begin the MIDI circuit check, and display result.
Display: No problem
Circuit problem or no connecting cable
• If retry of check, Press
n
button, and Press
N
button
with begin.
4 Signal check 1 (Bypass check mode)
1) Press
n
button.
2) Enter the bypass check mode.
Analog output muting is OFF, and each channel the out-
put signal as intact as input signal.
Display:
5 Signal check 2 (Sine wave output mode)
1) Press
n
button.
2) Enter the sine wave output mode.
Each channel output jack output a sine wave 1 kHz (about
7.3 Vp-p). (Input have muting)
Display:
6 Ending the test mode
1) Press n button.
2) The display change the following.
Display:
• Item
1
or
2
is executed at the work contents.
1
Next item (A) - (E) is press
[ENTER]
button.
(A) Change the ROM.
(B) Change the battery.
(C) Change the RAM.
(D) Customer request is initial state.
(E)
Besides the above-mentioned. Repair connected
with hardware on the main board.
This case display the following few seconds, and come
up power. (Initialize is done.)
Display:
2
Next item (F), (G) is press
[EXIT]
button.
(F) Hardware is not change repair.
(G) Only check, such as function check.
This case come up power usual. (No initialize)
* * * * * * * * * * * * * * * *
* * * * *
switch button's figure
(state of pressed all) rotary encoder count
(optional value)