CMT-101, HCD-101, TC-TX101 - Sony Audio Service Manual (repair manual). Page 9

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There are two methods to enter the TEST mode.

• How to Enter the Test Mode - 1

Remove the AC power cord from wall outlet, and press [EJECT
6].  While pressing [EJECT 6], connect the AC power cord to
wall outlet.

• How to Enter the Test Mode - 2

(This method toggles between “Entering the TEST Mode” and
“Exiting the TEST Mode”.)
Turn on the main power.  While pressing [TUNING +], press
[DBFB], release hand from [DBFB] then press [FUNCTION].
(Keep pressing [TUNING] all the way.)
Pressing these buttons again in the same order exits the TEST
mode.

* The small ATT segment lights in the center top of display during

the TEST mode.

* To exit the TEST mode, disconnect the AC power cord from wall

outlet, or use “How to Enter the TEST Mode - 2”.

1. Audio volume control setting (Can be adjusted only during TEST

mode.)
Press [CD STOP 

p] and [VOL–] at the same time

→

 VOL MINIMUM appears

Press [CD STOP 

p] and [VOL+] at the same time

→

 VOL MAXIMUM appears

*

The audio volume data is kept stored even after the main  power
is turned off.

2. Audio balance setting (Can be adjusted only during TEST

mode.)
Press [CD STOP 

p] and [DBFB] at the same time

→

 LEFT 10 appears

Press [CD STOP 

p] and [FUNCTION] at the same time

→

 RIGHT 10 appears

Press [CD STOP 

p] and [CD EJECT 6] at the same time

→

 CENTER appears

* The audio balance data is kept stored even after the main  power

is turned off.

3. Key test and FL display tube test (Can be adjusted only during

TEST mode.)
• Press [VOL-] and [BAND] at the same time

→

All FL tubes

light.  Pressing the following key in this status enables key
checks as follows.

• Display depending upon the pressed key
[FUNCTION]

→

KEY NO. 1

[VOL –]

→

KEY NO. 2

[VOL +]

→

KEY NO. 3

[BAND]

→

KEY NO. 4

[TUNING+]

→

KEY NO. 5

[EJECT 

6]

→

KEY NO. 6

[TUNING –]

→

KEY NO. 7

[STOP 

p]

→

KEY NO. 8

[PLAY 

^]

→

KEY NO. 9

[DBFB]

→

KEY NO. 10

• [POWER]

→

Returns to the TEST mode

* Note: After all keys are (KEY No.1 to KEY No.10) tested,

CHECK OK!! appears.

The following items have no relation with the TEST mode.

4. Initial setting (All clear of all memories)

Disconnect the AC power cord.  While pressing [POWER],
connect the AC power cord to wall outlet.

5. Watch operation check (Can be operated only while the main

power is off.)
Press [FUNCTION] and [BAND] at the same time. 

→

 Watch

starts counting.

Pressing the two keys at the same time enables the various
adjustment and test as follows in the TEST mode, and “ATT”
segment is flashing.

1) Pressing [TUNING–] and [CD EJECT 

6] at the same time :

The present normal tracking balance value (“31” to “36”) is
displayed when the above key operation is performed and
(TRBAL.) is displayed.

The tracking gain is fixed to “3F” (TOG1 to TOG2: all off)

2) Pressing [TUNING–] and [DBFB] at the same time :

(SHUFFLE) is displayed.
• ADJUSTMENT mode

When the above key operation is performed, the machine
enters the ADJUSTMENT mode.  The “SHUFFLE” flashes
on display tube.

During the ADJUSTMENT mode:

The CLV gain is not switched to 8 cm.  (The CLV gain is
fixed to 12 cm always.)
The machine is ready to enter the AF-ADJUSTMENT mode
as described below.

3) Pressing [TUNING–] and [FUNCTION] at the same time :

(SHUFFLE) and (PROGRAM) are displayed.
• AF-ADJUSTMENT mode

After the machine enters the ADJUSTMENT mode by the
key operation as described in step 2), the machine can enter
the AF-ADJUSTMENT mode by pressing the above key
operation. [TUNING – /FUNCTION]
The “SHUFFLE” and “PROGRAM” flash on display.

During the AF-ADJUSTMENT mode, the tracking and sled
servos are turned off in addition to the ADJUSTMENT mode.
The machine stops the GFS error check which is normally
performed by software.

• Sled motor check

When disc is removed by pressing EJECT during the AF-
ADJUSTMENT mode, the sled can be moved to inner
circumference or outer circumference by pressing [TUNING–
] or [TUNING+].  At this time, because the  microprocessor
is not sensing the sled position, be careful when moving the
sled not to damage gears and other  mechanism.

4) Pressing [TUNING–] and [VOL–] at the same time :

• No CDM mode

[1] is displayed.
When the above key operation is performed, the control on
the slot mechanism which takes in and ejects a CD disc is
stopped.
At this time “1” on the display flashes.

During the no CDM mode,

The TOC data is deleted by the [CD EJECT 

6]  key.

(When the TEST mode is cleared and a CD disc is inserted,
machine reads the TOC again.)