Test Mode - Sony HCD-GN700 Service Manual

HCD-GN700/GX8800
[GC TEST MODE]
• This mode is used to check the fluorescent indicator tube, LED,
model, destination, software version, volume, key and VACS
level.
Procedure:
[AMP MENU
1. Press x button,
simultaneously.
2. All LEDs and segments in fluorescent indicator tube are lighted
up.
3. When you want to enter the software version display mode,
[DISC 1]
press button. The model and destination are displayed.
[DISC 1]
4. Each time button is pressed, the display changes from
MC version, GC version, CD version, CDDM version, CDMA
version, CDMB version, BDA version, BDB version, ST version,
TA version, TM version and TC version in this order, and returns
to the MC version display.
[DISC 3]
5. When button is pressed while the version numbers
are being displayed except model and destination, the date of
the software creation appear. When
again, the display returns to the software version display. When
[DISC 1]
button is pressed while the date of the software creation
is being displayed, the date of the software creation is displayed
in the same order of software version display.
[DISC 2]
6. Press button, the key check mode is activated.
7. In the key check mode, the fluorescent indicator tube displays
"K 0 V 0".
Each time a button is pressed, "K" value increases. However,
once a button has been pressed, it is no longer taken into account.
"V" value increases in the manner of 0,1, 2, 3 ... if
knob is turned clockwise, or it decreases in the manner of 0, 9,
[VOLUME]
8,7 ... if knob is turned counter-clockwise.
[DISC 3]
8. When button is pressed after all LEDs and segments
in fluorescent indicator tube light up, the fluorescent indicator
tube displays "VACS A + B". A is VACS level which is trigger
by signal level while B is VACS level which is trigger by thermal.
Total VACS value would be the sum of A and B.
[DISC SKIP/EX-CHANGE]
9. When
LEDs and segments in fluorescent indicator tube light up,
alternate segments in fluorescent indicator tube would light up.
[DISC SKIP/EX-CHANGE]
If you press
half of alternate segments in fluorescent indicator tube would
[DISC SKIP/EX-CHANGE]
light up. Pressing
would case all segments lights up.
10. To release this mode, press three buttons in the same manner as
step 1, or disconnect the power cord.
[MC TEST MODE]
• This mode is used to check operations of the respective sections
of Amplifier, Tuner, and Tape.
Procedure:
* To enter MC Test Mode
[AMP MENU]
1. Press x button,
simultaneously.
2. The TAPE A and TAPE B segments flash on the fluorescent
indicator tube. The function is changed to VIDEO.
16
SECTION 4

TEST MODE

[DISC 2]
] button and
button
[DISC 3]
button is pressed
[VOLUME]
button is pressed after all
button again, another
button again
[DISC 3]
button and button
* Check of Amplifier
V
1. When button is pressed, GEQ increases to its maximum and
a message "GEQ MAX" appears on the fluorescent indicator
tube.
v
2. When button is pressed, GEQ decreases to its minimum and
a message "GEQ MIN" appears on the fluorescent indicator
tube.
B b
3. When button or button is pressed, GEQ is set to flat and
a message "GEQ FLAT" appears on the fluorescent indicator
tube.
[VOLUME]
4. When the knob is turned clockwise even slightly,
the sound volume increases to its maximum and a message
"VOLUME MAX" appears for two seconds, then the display
returns to the original display.
[VOLUME]
5. When the knob is turned counter-clockwise even
slightly, the sound volume decreases to its minimum and a
message "VOLUME MIN" appears for two seconds, then the
display returns to the original display.
* Check of clock frequency
1. To check the frequency of clock used to run the clock of the
system, the clock output is available at IC501 pin ek (CLOCK-
OUT) on the MAIN board during MC test mode.
2. The frequency is 32.768 kHz.
* Tape function
1. When a tape is inserted in Deck B and recording is started, the
function is changed to VIDEO automatically. When
button is pressed during recording in function, ALC (Automatic
Logic Control) is turned on.
2. After recording is stopped by pressing
button will change the function to TAPE B and rewind Tape B
until the recording start position and playback of Tape B is
[REC PAUSE/ START]
started. If the
pause and pressed again to resume recording during recording
time, when tape deck B is rewind, tape deck B will be rewind
until the position where the pause is applied.
* AMS Test Mode
1. Select the function "TAPE A" or "TAPE B".
2. Select Loop or Relay direction mode by pressing the
[DIRECTION]
button. Insert a test tape AMS-110A or AMS-
120 to selected tape deck.
[AMP MENU]
3. Press the button to enter the AMS test mode.
4. After the test tape is rewind to the beginning of the tape, the
AMS+ is checked, and the mechanism is shut off after detecting
the AMS signal twice.
5. Then the AMS- is checked and the mechanism is shut off after
detecting the AMS signal twice.
6. When the check is complete, a message of either OK or NG
appears.
* To release MC Test mode.
1. To release this mode, press
2. The cold reset is enforced at the same time.
[CD SYNC]
button, press m
x
button is pressed for a
button.
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