Aiphone MA-4U - Manual (Page 8)

(ADJUSTING CALL TONE VOLUME)
* Call tone volume can be adjusted to
(ADJUSTING CONTRAST)
* The picture contrast may be adjusted to
3 levels as desired.
STRONG MEDIUM SOFT
NIGHT
DAY
C adjusting brightness )
Notes: (1) To obtain the best picture, please set contrast switch to DAY position during daytime, and to NIGHT position
during the night, and then adjust brightness.
NEVER HOLD HOOK SWITCH DOWN, WHILE YOU PICK UP HANDSET. IF CALLED FROM DOOR JUST
AT THAT MOMENT, THE CHIME WILL BE ANNOUNCED LOUDSPEAKING THRU HANDSET AND
WOULD RUPTURE YOUR EARDRUM.
Do not keep MONITOR button in depressed position by tape, etc., which may cause damage.
(
2
)
(3)
( trouble - shooting guide )
No. MODE OF TROUBLE LOOK FOR
1
Unit totally dead. * Power supply not plugged.
* Connector leads to power supply disconnected.
* Short in connector leads to power supply.
2
Cannot call and communicate, and picture tube lights,
but no picture. * Inferior connector of coaxial cable at the terminal end.
* Short in coaxial cable connections at the terminal end.
* Break in coaxial cable.
* Coaxial cable disconnected.
* Defective door station (in camera).
3
Can call and communicate, and picture tube lights,
but no picture. * The shutter has closed to protect the vidicon in the camera from
direct sunlight . . . this is normal operation, not a fault.
* Defective door station (in camera).
4
Can call and communicate, but picture tube remains
dark. * Defective room station (in video monitor).
5 Cannot call from door station. * Defective door or room station.
6 Picture is okay, but no audio signal. * Defective door or room station.
7 Inferior sensitivity and contrast of picture tube. * Worn-out vidicon (A general life of vidicon is approximately
3 years in normal application).
8 Fuzziness in bright area.
9 Spots in picture.
10
“Negative” image (reversal of black and white). * Worn-out picture tube (A general life of picture tube is
approximately 4 years in normal application).
( cautions )
* DO NOT OPEN THE BACK COVER OF THE MA-4U UNIT, WITHOUT FIRST REMOVING PLUG OF PS-24M POWER
SUPPLY FROM AC OUTLET. The high voltage is loaded on the monitor unit inside.
* Do not connect any terminal on MA-4U to AC power lines.
* NEVER HOLD HOOK SWITCH DOWN, WHILE YOU PICK UP HANDSET. IF CALLED FROM DOOR JUST AT
THAT MOMENT, THE CHIME WILL BE ANNOUNCED LOUDSPEAKING THRU HANDSET AND WOULD
RUPTURE YOUR EARDRUM.
* Avoid to run the coaxial cable thru doors or windows or between furniture, which may pinch coaxial cable.
* Please handle MA-4U unit with utmost care. The unit, if dropped or struck, may be damaged.
Aiphone warrants its products to be free from defects of material and workmanship under normal use and service for a period of one
year after delivery to the ultimate user and will repair free of charge or replace at no charge, should it become defective upon which
examination shall disclose to be defective and under warranty. Aiphone reserves unto itself the sole right to make the final decision
whether there is a defect in materials and/or workmanship; and whether or not the product is within the warranty.
This warranty shall not apply to any Aiphone product which has been subject to misuse, neglect, accident, or to use in violation of
instructions furnished, nor extended to units which have been repaired or altered outside of the factory.
This warranty does not cover batteries or damage caused by batteries used in connection with the product.
This warranty covers bench repairs only, and any repairs must be made at the shop or place designated in writing by Aiphone. Aiphone
will not be responsible for any costs incurred involving on site service calls.
Aiphone Co., Ltd., Nagoya, Japan
Aiphone Corporation, Bellevue, Washington
MA-4UI-1083
(A)
ALL OVER THE WORLD
AIPHONE
PRINTED IN JAPAN ©