Sony DPP-MS300E, Service Manual

Page: 19 / 88

3-1 E
SECTION 3
MECHANICAL ADJUSTMENTS
Replacing the Thermal Head
1) Before replacing the head, print the stair-step pattern with the
old head (faulty head).
Note 1: Only when the head is not entirely damaged with black or
white lines.
Note 2:
To reproduce the stair-step pattern, refer to “Adjusting
Method 1” in “4. Electrical Adjustments”.
2) Remove the upper cabinet. (Refer to “2. Disassembly”.)
3) Remove the flat cables
1
(POHE13) and
2
(ADHE13) from
the thermal head. (Refer to Fig. 1)
4) Remove the two screws
3
(BVTT2.6
×
6) and remove the
harnesses
4
and fan holder
5
. (Refer to Fig. 1)
5) Remove screw
6
, (PS2.6
×
4) and remove the ribbon guide
7
. (Refer to Fig. 2)
6) Remove the two screws
8
(PSW2.6
×
8) and remove the ther-
mal head
9
from the heat sink
0
. (Refer to Fig. 2)
Note: Do not remove the screw
!™
fixing the heat sink
0
and head
arm
!¡
.
7) Replace the thermal head
9
.
Note:
Make sure that the silicon grease (white) does not stick onto
the printing screen of the thermal head. If it does, remove with
alcohol.
8) Assemble in the reverse order of steps 2) to 6).
9) Perform “Head Voltage Adjustment” of “4. Electrical Adjust-
ments” (Page 4-3).
3
two screws
(BVTT2.6
×
6)
4
harness
4
harness
2
flat cable
(ADHE13)
1
flat cable
(POHE13)
5
fan holder
!¡
head arm
8
two screws
(PSW2.6
×
8)
6
screw
(PS2.6
×
4)
7
ribbon guide
!™
two screws
Note: Do not remove
the screw.
0
heat sink
9
thermal head
Fig. 1
Fig. 2