Sony CFD-G70 Service Manual ▷ View online
3
CFD-G70
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electro-
static breakdown because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic breakdown and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled
with care.
static breakdown because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic breakdown and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled
with care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused
on the disc reflective surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode
emission, observe more than 30 cm away from the objective
lens.
The laser beam on this model is concentrated so as to be focused
on the disc reflective surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode
emission, observe more than 30 cm away from the objective
lens.
CHUCK PLATE JIG ON REPAIRING
On repairing CD section, playing a disc without the CD lid, use
Chuck Plate Jig.
• Code number of Chuck Plate Jig : X-4918-255-1
On repairing CD section, playing a disc without the CD lid, use
Chuck Plate Jig.
• Code number of Chuck Plate Jig : X-4918-255-1
SECTION 1
SERVICING NOTES
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
1. Press CD open knob.
2. Open the lid for CD.
3. Push on SWITCH (S801) as following figure.
4. Confirm the laser diode emission while observing the
CHECK
1. Press CD open knob.
2. Open the lid for CD.
3. Push on SWITCH (S801) as following figure.
4. Confirm the laser diode emission while observing the
objecting lens. When there is no emission, Auto Power
Control circuit or Optical Pick-up is broken.
Objective lens moves up and down once for the focus
search.
Control circuit or Optical Pick-up is broken.
Objective lens moves up and down once for the focus
search.
To Exposed Metal
Parts on Set
Parts on Set
0.15
µF
1.5k
Ω
AC
voltmeter
(0.75V)
voltmeter
(0.75V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
SAFETY CHECK-OUT (US model)
After correcting the original service problem, perform the
following safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs,
screws, and all other exposed metal parts for AC leakage. Check
leakage as described below.
following safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs,
screws, and all other exposed metal parts for AC leakage. Check
leakage as described below.
LEAKAGE TEST
The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes).
Leakage current can be measured by any one of three methods.
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a VOM
or battery-operated AC voltmeter. The “limit” indication is 0.75
V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)
V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)
Insert a precision
screw driver and push
SWITCH (S801)
screw driver and push
SWITCH (S801)
4
CFD-G70
• Service Position
Note: For removal, a screwdriver with the long shaft 25cm or more is required.
Repair without removing Headphone board.
Cabinet (front) ASSY
Tuner board
Cabinet top ASSY
Main board
Cabinet (rear) ASSY
5
CFD-G70
SECTION 2
GENERAL
LOCATION AND FUNCTION OF CONTROLS
This section is extracted from
instruction manual.
instruction manual.
1 Tape operation buttons
REC z
PLAY N
REW m
FF M
STOP/EJECT x/Z
PAUSE X
2 PRESET – button
3 PRESET + button
4 CD u button
5 CD x button
6 VOLUME –/+ button
7 Z PUSH OPEN/CLOSE
8 GAME/LINE button
9 GAME Xpand button
0 MODE button
qa SOUND button
qs RADIO BAND/AUTO PRESET button
qd POWER DRIVE WOOFER button
qf CD: AMS > button
Radio: TUNE + button
qg CD: AMS . button
Radio: TUNE – button
qh Remote sensor
qj Display window
qk GAME/LINE IN jack
ql i jack
w; OPR/BATT indicator
wa DISPLAY ENT/MEMORY button
ws POWER button
wd SLEEP button
0
8
9
qa
qh
qd
qj
qk
ql
qs
qf
qg
wd
w;
wa
ws
1
6
23 45
7
6
CFD-G70
SECTION 3
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
3-1. CABINET (FRONT) ASSY, CABINET (REAR) ASSY
z
The equipment can be removed using the following procedure.
Set
Cabinet (front) ASSY
Cabinet (rear) ASSY
Cabinet top ASSY
LCD board
AC inlet board, Power board,
VOL SEL board (E4 model)
VOL SEL board (E4 model)
BATT board,
BATT COM board
BATT COM board
Main board
Tuner board
CD board, TC board,
Optical pick-up block,
Mechanism deck
Optical pick-up block,
Mechanism deck
M321 (Capstan/Reel motor),
Belt, HRP301 Head, magnetic,
HE301 Head (Erase)
Belt, HRP301 Head, magnetic,
HE301 Head (Erase)
Optical pick-up (KSS-213C)
Control-1 board, Control-2 board
Headphone board
1
8
4
2
Screw
(+BVTP 3
×
20)
2
Screw
(+BVTP 3
×
20)
5
Screw
(+BVTP 3
×
10)
6
Flexible cable
(from Main board CNP805)
7
Connectors
(from Headphone board CN391, 394, 396)
3
Screws
(+BVTP 3
×
14)
3
Screws
(+BVTP 3
×
14)
3
Screws
(+BVTP 3
×
14)
Cabinet (rear) ASSY
Cabinet (front) ASSY
Lid, battery case
• Abbreviation
E4
: 110-120V/220-240V AC changeable
