Test Mode - Pioneer CRT3452 Service Manual

1

6.5 TEST MODE

1) Precautions on Adjustment
• Because this equipment uses a single voltage (+5 V)
A
in the regulator, the reference voltage of a signal is
not GND, but is REFO (VR21, VR25, PREF). If REFO
and GND are mixed and touched at product
adjustment, correct potential cannot be measured
but also the servo malfunctions and an strong
shock applies to the pickup. So, note the following
items. REFO and GND must not be mixed on the
negative side of the probe of the measuring
apparatus. In particular, do not connect the
negative side of the ch1 probe of the oscilloscope to
REFO and the negative side of the ch2 probe to
B
GND. Further, in general, because most main units
of measuring apparatuses reach the same potential
as the negative side of the probe, make the main
unit of the measuring apparatus enter the floating
state. If REFO and GND are incorrectly connected,
immediately turn off the power.
• Be sure to turn off the power when attaching and
detaching the various filters and wire materials
required for measurement.
• For the adjustment and measurement after power-
C
on, adjust or measure after having performed
running for about one minute until the circuit
becomes stable.
• Because various types of protection do not operate
by software in the test mode, do not apply a
mechanical and electrical shock during adjustment.
• This equipment uses a photo transistor to detect a
disc when inserting and removing it to and from the
tray. Accordingly, if strong light enters this
equipment with the case remove at repair and
adjustment, the following malfunctions may occur.
D
* Although there is a disc, play is disabled because
the disc cannot be used.
* A disc of 12 cm is incorrectly detected for a disc
of 8 cm.
When a malfunction occurred, take action such as
changing the position of the light source, changing
the orientation of this equipment or covering a
photo transistor.
• In the test mode, after having executed carriage
movement during focus search, immediately turn
off the power. (The lens is stuck up or down and
E
the actuator may be damaged by fire.)
• During disc replacement, press the key of the disc to
be replaced by a new one.
F
74
1
2
2) Test Mode
Because this machine is adjusted by combining a
pet unit, each adjustment key operation is also
performed by the pet unit. For reference purposes,
how to enter the test mode and key operation for
KEX-M9737ZT-02/UC are described. Besides, the key in this
adjustment text is also an KEX-M9737ZT-02/UC key.
• How to enter the test mode
Normal mode
Diagnosis mode
• How to reset the test mode
Enter ACC and backup OFF.
• After having executed carriage movement during
focus search, immediately turn off the power.
(Because the lens is stuck, the actuator may be
damaged by fire.)
• The TR Jump below 255 TR continues operation
even if the key is detached. Other TR Jumps enter
the T Close state when the key is detached.
• As soon as the power is turned on/off, the Jump
Mode is reset to Single TR and the automatic
adjustment value returns to the initial value.
• During disc replacement, press the key of the disc to
be replaced by a new one.
• Be sure to load a DVD disc on the first tray of the
magazine.
XDV-M8357ZT/UC
2
3
Press the DISC key three times while
pressing the 1 key and 6 key.
Press the AM and SEEK/TRACK DOWN key.
Test mode
3
4
4