Technics SA-222 M Service Manual

e@ How to remove the power !IC @
1. Remove the cabinet and bottom board. (Refer to os
‘How to remove the cabinet,’’ and ‘‘How to remove @
the bottom board."’) SS ee a
2. Remove the 4 setscrews (Fig. 6 : @ ~ @) to detach
the power transformer from rear panel in the direc-
tion of the arrow @.
Unsolder of power IC.
4. Remove the 2 setscrews (Fig. 6 : @ , @) used to
secure the power IC on the heat sink, and then pull
the power IC.
5. When mounting the power IC, apply silicone com-
pound (or equivalent heat diffuser) to the rear side of
power IC, and then follow the steps 1 ~ 4 reversely.
w
Power transformer
[Fig. 6]
e How to replace chips (resistor, capacitor and jumper)
1. Unsolder from chip by using solder sucker.
2. Remove chip with tweezers by rotating it while remov-
ing solder as shown in Fig. 7.
3. Solder circuit board first and then solder chip in the
direction of the arrow as shown in Fig. 8.
Notes:
1. Do not use chip again which is removed from printed
circuit board.
2. Use lead wire with insulator for replacement instead of pee
chip jumper. z
Tweezers
_ Soldering
Color Original Parts Name
Unsolder
Black Chip Resistor and Jumper
Brown, White or Green Chip Capacitor
e Note for replacing chips
1. Do not heat chips more than three (3) seconds.
2. Be careful not to damage the electrode of chips.
replacing chips.
e Precautions for repair
Soldering
Chip
iron
by oscilloscope.
Solder
ment to IC terminals.
Rear panel Heat sink
Power IC
3. Use soldering iron (less than 60W) and tweevers for
When frequency is not indicated, FL (display tuse), FL
driver, digit circuit, and micro-computer must be ch ecked
In this case, take care not to allow short circuit between IC
terminals or application of voltage from measuring j nstru-

Technics SA-222 M Specifications

General

Brand	Technics
Model	SA-222 M
Category	Stereo Receiver
Language	English