HCD-GTR33, HCD-GTR55, HCD-GTR77, MHC-GTR33, MHC-GTR55, MHC-GTR77 - Sony Audio Service Manual (repair manual). Page 4

Step: 1) Work after removing the case (side-R and side-L) referring to “2.2. CASE(SIDE-L/R)” on disassembly (page 5).
 

  2)  Work after removing the top case referring to “2-3. TOP CASE” on disassembly (page 6).

d

a

e

c

c

b

When installing a new OP unit, be sure to connect the fl ex-
ible printed circuit board fi rst of all before removing the static 
electricity prevention solder bridge by unsoldering.
Remove the static electricity prevention solder bridge by unsolder-
ing after the fl exible printed circuit board has already been con-
nected.
(Do not remove nor unsolder the solder bridge as long as the OP 
unit is kept standalone.)

BOARD FOR HCD-GTR55/GTR77
Take note for HCD-GTR55/GTR77 set as listed below:
a)  For all serial number of HCD-GTR55/GTR77 
 

(AR, E2, E51 and MX)

b)  For serial number which is before S 011206151 of 
 HCD-GTR55 

(E4)

c)  For serial number which is before S 011206641 of 
 HCD-GTR77 

(E4)

The IC800 is limited to the stock quantity of service parts.
When the IC800 cannot be obtained, exchange the complete 
POWER board (refer to Supplement-1).
Moreover, when the complete POWER board is exchanged, you 
must also exchange the IC401 on the MAIN board (refer to Sup-
plemetn-1) at the same time.
Refer to Supplement-1 (page 2) for the “REPLACING THE IC800 
ON THE POWER BOARD” fl owchart.

Note: Refer to Supplement-1 for the servicing notes, printed 

wiring board, schematic diagram of POWER board (HCD-
GTR55/GTR77) and electrical part list of POWER board 
(HCD-GTR55/GTR77) and MAIN board (HCD-GTR55/
GTR77).

• Abbreviation
 AR  : 

Argentina 

model

  E2 

: 120V AC area in E model

 E4  : 

African 

model

  E51 

: Chilean and Peruvian models

  MX 

: Mexican model