Yamaha HS80M Service Manual page 10

HS80M/HS50M
6. TRANS Circuit Board and Power Trans-
former
(Time required: about 2 minutes)
6-1 Remove the rear panel assembly. (See procedure 3.)
6-2 Remove the four (4) screws marked [130]. The TRANS
circuit board with the power transformer can then be
removed. (Fig. 3)
6-3 Unsolder the power transformer mounting solder (6
locations) and separate the power transformer from
the TRANS circuit board.
* The power transformer is not a component of the
TRANS circuit board.
7. AC INLET Circuit Board
(Time required: about 2 minutes)
7-1 Remove the rear panel assembly. (See procedure 3.)
Unsold soldered parts (2 locations) of the power
switch.
7-2 Remove the two (2) screws marked [150]. (Fig. 3)
7-3 Unsold the soldered part of the AC inlet grounding
wire and remove the AC INLET circuit board.
(Photo. 4)
[130]
Fig. 3
[110]: Bind Head Tapping Screw-S 3x10 (WG341400)
[115]: Bonding Tapping Screw-B 3x10 (WH042000)
[130]: Bind Head Tapping Screw-S 4x10 (WG341300)
[150]: Bind Head Screw-S 3x15 (WG341500)
10
LEVEL Knob
AC INLET Circuit Board AC INLET Circuit Board
[110]
[115]
[150]
HS80M
Power Switch Power Switch
Solder Solder
AC Inlet AC Inlet
Photo. 4
[D] [D]
[E] [E]
[F] [F]
Photo. 5