HCD-GZR888DA, HCD-GZR999DA - Sony Audio Service Manual (repair manual). Page 6

Note of replacing the IC401 on the POWER AMP board
(HCD-GZR999DA only)
The IC401 on the POWER AMP board of HCD-GZR999DA has 
been changed from the midway of production.
Therefor, the IC401 of Former type is limited to the stock quantity 
of service parts.
When the IC401 of Former type cannot be obtained, exchange the 
complete POWER AMP board.
However, when the complete POWER AMP board is exchanged, 
you must also exchange the IC501 on the MAIN board to New 
type at the same time.

•  Serial Number Confi rmation
Confi rm the serial number, and do the work with reference to the 
fl owchart.

120V AC area in E model (E2)

4100500 or 
smaller

4100501 or 
larger

240V AC area in E model (E3)

3101067 or 
smaller

3101068 or 
larger

110 - 120V/220 - 240V AC 
area in E model (E4)

6500623 or 
smaller

6500624 or 
larger

Saudi Arabia model

3500570 or 
smaller

3500571 or 
larger

Mexican model

3101920 or 
smaller

3101921 or 
larger

Chilean and Peruvian models

9151820 or 
smaller

9151821 or 
larger

Singapore model

3150450 or 
smaller

3150451 or 
larger

Philippines model

4100926 or 
smaller

4100927 or 
larger