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CDX-GT48UM/GT480U/GT480US/GT484US
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NOTES ON CHIP COMPONENT REPLACEMENT
- Never reuse a disconnected chip component.
- Notice that the minus side of a tantalum capacitor may be damaged by heat.
TEST DISCS
Please use the following test discs for the check on the CD
section.
YDES-18 (Part No. 3-702-101-01)
PATD-012 (Part No. 4-225-203-01)
SAFETY-RELATED COMPONET WARNING!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE
WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS
WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostat-
ic break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The fl exible board is easily damaged and should be handled with
care. NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused
on the disc re
fl ective surface by the objective lens in the optical
pickup block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.
CAUTION
Use of controls or adjustments or performance of procedures
other than those speci fi ed herein may result in hazardous radia-
tion exposure.
If the optical pick-up block is defective, please replace the whole
optical pick-up block.
Never turn the semi- fi xed resistor located at the side of optical
pick-up block.
optical pick-up
semi-fixed resistor
- Abbreviation
AR : Argentina model
IND : Indian model
MX : Mexican model
Model Part No.
GT480U: E 4-119-904-0
[]
4-119-905-0 []
GT480US: E 4-119-906-0
[]
4-119-907-0 []
GT480US: MX 4-119-908-0[]
GT480US: AR 4-119-909-0[]
GT484US: IND 4-119-910-0[]
GT48UM: IND 4-119-911-0[]
MODEL IDENTIFICATION
The CDX-GT480U and CDX-GT480US include the model
manufactured in Chinese and the model manufactured in Thai.
This service manual guides the model manufactured in Chinese.
Check the part number speci fi ed on the model number label when
performing service and inspection.
FRONT PANEL Part No.
-Bottom View-
