Sanyo FXD-780-RDS, FXD-780-GD Service manual
FILE NO.
SERVICE MANUAL
REL
ATP
BAS-X
LO/DX
LOUD
FM/AM CD RECEIVER FXD-780GD 50W x 4
1
23456
RPTSHF
Full Panel Detachable
High Power
FM/AM Stereo Receiver
Compact Disc Player
VOL
TUNTUN
TRKTRK
AUDIO
MUTE
POWER
FXD-780GD
FXD-780GD (SS)
114782850
FXD-780GD (BK.SS)
114782855
FXD-780RDS (XE)
114782851
FXD-780RDS
Contents
SERVICE NOTES and PRECAUTIONS .................................................................................................................. 1
ELECTRICAL ADJUSTMENTS................................................................................................................................ 4
BLOCK DIAGRAM ..................................................................................................................................................11
IC/TRANSISTOR LEAD IDENTIFICATION............................................................................................................ 13
CD MECHANISM EXPLODED VIEW .................................................................................................................... 15
CABINET & CHASSIS EXPLODED VIEW............................................................................................................. 16
PARTS LIST - CABINET, CHASSIS AND ACCESSORIES ...................................................................................17
PARTS LIST - CD MECHANISM ........................................................................................................................... 19
PARTS LIST-MAIN................................................................................................................................................. 21
PARTS LIST-DISP ................................................................................................................................................. 30
PARTS LIST-RF33 ................................................................................................................................................. 32
SCHEMATIC DIAGRAM ........................................................................................................................................ 38
CIRCUIT BOARD DIAGRAM ................................................................................................................................. 44
REFERENCE No. SM-7900010
Specifications
FM TUNER
Tuning Range.............................................................................. 87.5 - 107.9 MHz. (200 KHz. step)
87.5 - 108.0 MHz. (50 KHz. step)
Sensitivity .................................................................................... 1.5 µV
Separation................................................................................... 30 dB
Signal-to-Noise Ratio .................................................................. 65 dB (stereo), 70 dB (mono)
AM TUNER
Tuning Range.............................................................................. 530 - 1,710 KHz. (10 KHz. step)
531 - 1,602 KHz. (9 KHz. step)
Sensitivity .................................................................................... 20 µV
Signal-to-Noise Ratio .................................................................. 45 dB
CD PLAYER
Frequency Response .................................................................. 20 - 20,000 Hz.
Signal-to-Noise Ratio .................................................................. 90 dB
Channel Separation .................................................................... 60 dB
Dynamic Range .......................................................................... 90 dB
Harmonic Distortion..................................................................... 0.2 %
AUDIO AMPLIFIER & GENERAL
Maximum Output Power ............................................................. 50 W x 4 channels
Output Wiring .............................................................................. Floating-Ground type designed for
4-speaker use
RCA low-level outputs: 2 channels
Output Impedance ...................................................................... 4 - 8 ohms
Power Supply .............................................................................. 12 volts DC, negative ground
Specifications are subject to change without notice.
SERVICE NOTES AND PRECAUTIONS
SERVICE NOTES
1. Make sure that the power lead is connected properly to
power source, otherwise damage to radio may result. If a
battery eliminator is used as a power source in place of a
battery, it must be filtered and regulated. (The power supply capacity should be more than 5 amps.)
2. Integrated circuits (ICs) are used in this unit. Because the
ICs are direc-coupled devices, as to all electronic equipment, reading within 10% of the indicated values are acceptable. Allowance must also be made for variations in
supply voltage. It is expected that any breakdown within
the IC results in drastic changes of the operating voltages
at the terminals.
3. When replacing a power output IC, remember to use the
IC specified in the parts list; Coat the IC-fin with silicon
grease.
WARNING
ln using meters, signal generator and any tool in servicing
Ics, extreme care is needed. DO NOT SHORT THE IC TERMINALS TO THE PATTERN ON THE PC BOARD OR TO
EACH OTHER. THE IC WILL BE INSTANTANEOUSLY DESTROYED.
ALIGNMENT PROCEDURE
Alignment is performed at factory with laboratory equipment.
Therefore, before alignment is attempted, the unit should be
thoroughly checked for circuit troubles.
NOTES:
1. Check for specified source voltage-DC, 14.4volts.
2. Connect an AC voltmeter (AC VM) across speaker or
dummy load (4 ohms. 20W , wirewound resistor)...see Fig.
11-3. (ELECTRICAL ADJUSTMENTS)
3. Signal input must be kept as low as possible to avoid overload and clipping (use highest sensitivity of output indicator).
4. Repeat adjustment to ensure good results.
5. Non-metallic alignment tools must be used (especially at
FM alignment).
6. For alignment location details, refer to CIRCUIT BOARD
DIAGRAM.
INSTALLATION PROCEDURE
1. To prevent a short circuit, remove the key from the ignition and disconnect the
2. Make the proper input and output wire connections for
each unit.
3. Connect the wiring harness wires in the following order:
ground, speakers, battery, ignition.
4. Connect the wiring harness connector to the unit.
5. Install the unit in your car.
6. Reconnect the
7. Disinstall by reversing the installation procedure.
battery.
battery.
CAUTION
• The rear-panel which also heatsink is very hot. Don’t burn!!
• If your car’s ignition does not have an ACC position, connect the ignition wires to a power source that can be turned
on and off with the ignition key . If you connect the ignition
wire to a power source with a constant voltage supply, as
with battery wires, the battery may die.
• If the console has a lid, make sure to install the unit so
that the cover will not hit the lid when closing and opening.
• If the fuse blows, first make sure the wires aren’t touching
to cause a short circuit, then replace the old fuse with one
with the same rating.
• Do not let unconnected wires or terminals touch metal on
the car or anything else conducting electricity. To prevent
a short circuit, do not remove the caps on the ends of the
unconnected wires or the terminals.
• Connect the speaker wires correctly to the terminals to
which they correspond. The unit may be damaged or fail
to work if you share the
metal part in the car.
• After the unit is installed, check whether the brake lamps,
blinkers, wipers, etc. on the car are working properly.
• Insulate unconnected wires with vinyl tape or other similar material .
wires or ground them to any
— 1 —
SERVICE NOTES AND PRECAUTIONS
LASER BEAM SAFETY PRECAUTIONS
NOTES FOR TRANSPORT AND STORAGE
1. The pickup should always be kept in its conductive bag
until use.
2. The pickup should never be subjected to external pressure or impact.
Storage in conductive bag Drop impact
GOOD
REPAIR NOTES
1. The pickup incorporates a strong magnet, and so should
never be brought close to magnetic materials.
NG
3. Each and every pickup is already individually adjusted to
a high degree of precision, and for that reason the adjustment point and installation screws should be absolutely
never be touched.
4. Laser beam may damage the eyes!
Absolutely never permit laser beams to enter the eyes!
Also NEVER switch ON the power to the laser output part
(lens, etc.) of the pickup if it is damaged.
Laser Beam
NEVER look directly at the
laser, and do not let contact
fingers of other exposed
skin.
NG
Magnet
NG
2. The pickup should always be handled correctly and carefully, taking care to avoid external pressure and impact. If
it is subjected to strong pressure or impact, the result may
be an operational malfunction and/or damage to the
printed circuit board.
Pressure
Pressure
5. Cleaning the lens surface
If there is dust on the lens surface, the dust should be
cleaned away by using an air brush (such as one used for
camera lens). The lens is held by a delicate spring.
Conductive Sheet
6. Never attempt to disassemble the pickup.
— 2 —
SERVICE NOTE AND PRECAUTIONS
STATIC ELECTRICITY
The CD pickup might suffer destruction by static electricity during spare-parts maintenance or replacement, although it is stable
when connected to the circuit in the CD unit. The destruction might be caused because the laser diode terminal will be electrically open. To prevent the terminal from being open, do the following steps:
1. When you replace the CD pickup, or remove the CD unit from the car stereo unit for any maintenance purpose, solder the
copper foil pattern indicated in Fig. 1 and Fig. 2 below to short-circuit the connector PCB and flexible wire of the CD unit.
Perform your intended maintenance work with the flexible wire short-circuited.
2. If the original CD pickup may possibly be reused, make a short circuit in the area indicated in Fig. 3 first. Then remove the
pickup and perform the work.
3. The CD Pickup OPTIMA-715K2, which is supplied as one of the spare parts, is already short-circuited with the copper foil
pattern pre-soldered indicated in Fig. 3 below. To handle this CD Pickup, keep the short circuit as it is. Then attach the
Pickup to the unit and connect the flexible wire to the connector.
4. After performing the work, eliminate the short circuit by removing the solder at its respective short-circuited area described
in 1, 2 and 3 above.
5. Insert a CD. If the E-01 or E-02 error should appear on the display on the face plate, check the area mentioned in 4 above,
where the short circuit may not have been eliminated.
6. Note that the semi-fixed VR equipped with the CD Pickup OPTIMA-715K2 must not be turned. You cannot make any
adjustment to the semi-fixed VR, which is completely adjusted when shipped at the factory.
Fig. 3Fig. 2
Fig. 1
— 3 —
ELECTRICAL ADJUSTMENTS
ALIGNMENT OF FM RF & IF SECTION
Set the radio for FM reception. FM signal generator should be coupled with antenna receptacle, through dummy.
STEP
1
2
3
FM SG
&
STEREO SG
GENERATOR
FREQUENCY
Non-Mod.
Non-Mod.
98.1MHz
1kHz, 22.5kHz dev.
SG att:66dBµ EMF
VTVM
*1 *2
FM
DUMMY
ANTENNA
T.P
SET
DUMMY
LOAD &
SW BOX
*1 ：Refer to “DUMMY BOX SCHEMATIC” (Page 10) Fig.11-2
*2 ：Refer to “DUMMY BOX SCHEMATIC” (Page 10) Fig.11-3
Fig. 4 * SG frequency should be as accurate as possible.
RADIO DIAL
SETTING
87.5MHz
107.9MHz
108MHz
98.1MHz
OUTPUT
INDICATOR
DC VTVM to test
VT
point
DC VTVM to test
VT
point
AC VTVM to test
point*
ADJUST-
MENT
—
L103
FM OSC
L110
FM DET
Check the voltage over than
1.1 V.
Adjust for 6.9±0.1V
NULL VOLTAGE to become
-20±20mV.
DISTORTION METER
AC VOLTMETER
REMARKS
4
98.1MHz
1kHz, 22.5kHz dev.
SG att:6dBµ EMF
5
98.1MHz
1kHz, 22.5kHz dev.
SG att:6dBµ EMF
98.1MHz
88.5MHz
AC VTVM across
speaker or 4 ohms
load
AC VTVM across
speaker or 4 ohms
load
L107
FM MIX
L110
FM ANT
L102
FM RF
6
88.5MHz
107.9 (108)MHz
SG att:6dBµ EMF
87.5MHz
107.9 (108.0)
MHz
AC VTVM across
speaker or 4 ohms
load
L100
FM ANT
L102
FM RF
7
98.1MHz
SG att:25dBµ EMF
98.1MHz
TEST MODE
Adjust so that the
*2
“ST” mark of LCD
R129
FM SD
Display appears
7*
RDS
98.1MHz
1kHz, 22.5kHz dev.
SG att:33dBµ EMF
98.1MHz
TEST MODE
Adjust like to appear
*2
for 0.95 of LCD
Display
R204
*1 : Perform step 6 after MPX adjustment of the following page (page 6).
*2 : Setting up TEST MODE at page 7.
Adjust for Maximum output Level.
Adjust for Maximum output Level.
Check for SPEC.
Sensitivity of the seeking frequency.
Sensitivity of the S meter.
— 4 —
ELECTRICAL ADJUSTMENTS
ALIGNMENT OF AM RF & lF SECTION
Set the radio for AM reception. AM signal generator should be coupled with antenna receptacle through dummy.
Set VOLUME control to maximum and TONE to center. Attenuate signal generator output to maintain 0.5 watts (1.4 volts across
4 ohms load) on AC voltmeter.
STEP
1
2
3
AM SG
&
STEREO SG
GENERATOR
FREQUENCY
Non-Mod.
Non-Mod.
1000kHz, 999kHz
400Hz
30% MOD
SG att: 20dBµ EMF
ANTENNA
RADIO DIAL
SETTING
530kHz
531kHz
1710kHz
1602kHz
1000kHz
999kHz
VTVM
*1 *2
AM
DUMMY
T.P
SET
DUMMY
LOAD &
SW BOX
DISTORTION METER
AC VOLTMETER
*1 ：Refer to “DUMMY BOX SCHEMATIC” (Page 10) Fig.11-1
*2 ：Refer to “DUMMY BOX SCHEMATIC” (Page 10) Fig.11-3
Fig. 5 * SG frequency should be as accurate as possible.
OUTPUT
INDICATOR
DC VTVM to test
VT
point
DC VTVM to test
VT
point
AC VTVM across
speaker(L or R) or 4
ohms load
ADJUST-
MENT
—
—
L108
AM IFT1
L111
AM IFT2
REMARKS
Check the voltage over than 2.5V.
Check the voltage less than 7.5V.
Adjust for Maximum output Level.
4
1000kHz, 999kHz
400Hz
30% MOD
TEST MODE*
SG att: 30dBµ EMF
* Setting up TEST MODE at page 7.
1000kHz
999kHz
Adjust so that the
“ST” mark of LCD
Display appears
— 5 —
R124
AM SD
Sensitivity of the seeking frequency.
ELECTRICAL ADJUSTMENTS
ALIGNMENT OF FM MULTIPLEX SECTION
FM signal generator should be modulated by FM stereo signal generator.
Modulation level: 19kHz 10% (7.5kHz dev)
1000Hz 30% (22.5kHz dev)
FM signal generator output level: 66dBµ (1mV)
Frequency: 98.1 MHz.
Set the radio for FM reception and tune to signal. Adjust volume control to provide 0.5 watt on AC VTVM and tone to center. Set
L/R balance control for equal output at each channel.
STEP
1
2
3
MODULATION
FREQUENCY
19kHz & 1000Hz
(Left Channel)
SG att:66dBµ EMF
19kHz & 1000Hz
(Right Channel)
19kHz & 1000Hz
(Left Channel)
SG att:45dBµ EMF
OUTPUT INDICATOR
AC VTVM across Right speaker or
Right channel load
AC VTVM through Left speaker or
Left channel load
AC VTVM across Right speaker or
Right channel load
ADJUST-
MENT
R137
R137
R156
REMARKS
Adjust for minimum.
Check for minimum.
Adjust for 20dB Separation.
— 6 —
ELECTRICAL ADJUSTMENTS
w
FOR FXD-780GD
SETTING UP TEST MODE AT STEP 4 FOR AM & STEP 7 FOR FM
Press the e
to set the mode to the test mode shown in Step 4 for AM and Step 7 for FM.
POWER
button to turn the power off. Next, use the following procedure with the front panel switches
REL
ATP
BAS-X
LO/DX
LOUD
FM/AM CD RECEIVER FXD-780GD 50W x 4
1
23456
RPTSHF
VOL
AUDIO
MUTE
POWER
TUNTUN
TRKTRK
erq
Fig. 6
1. While the power is off, press the q
neously to enable the w
BAND
PRESET 1
button. Then press the w
BAND
button and e
button to be used at the moment the power comes on.
POWER
button simulta-
2. If the above operation is successful all the figures on the LCD light up, check that you have entered test mode. Fig. 7 (A).
3. Press the r
AUDIO
button once. The display shown in Fig. 7 (B) appears on the LCD and the unit enters DX mode.
Then, while receiving FM 98.1MHz rotate the Semi-fixed VR R129 on the TUNER UNIT (RF33) to adjust the LCD until the
stereo mark light “
4. Press the r
ST
” is on. Fig. 7 (B)’.
AUDIO
button, if the display changes to that shown in Fig. 7 (C) the unit is in Local mode. Check that the “
ST
” mark
is displayed (for specific: Input level is 12 ~ 28dB higher than that of the DX mode).
5. Press the w
6. Then press the r
fixed VR R124 on the TUNER UNIT (RF33) to adjust the LCD until “
7. Then press the r
“
ST
” mark is displayed. (for specific: Input level is 12 ~ 28dB higher than that of DX mode).
BAND
button, if the display changes to that shown in Fig. 7 (D) or (D)’ receiving AM 1000 kHz or *(999) kHz.
AUDIO
button, if the display changes to that shown in Fig. 7 (E) the unit is in DX mode. Rotate the Semi-
ST
” mark lights up.
AUDIO
button, if the display changes to that shown in Fig. 7 (F) the unit is in Local mode. Check that the
8. Turn off the power to release the test mode.
TEST MODE CHART
(A) Enter the Test Mode
(C) FM Local Mode OK
(B) FM DX Mode
(B’)OK
(D) Receiving 1000kHz
(D’) Receiving 999kHz
(E) AM DX Mode
(F) AM Local Mode
Fig. 7
— 7 —
(E’)OK
TEST MODE CHART
tw
(A) Enter the Test Mode
ELECTRICAL ADJUSTMENTS
FOR FXD-780RDS
r eq y
Fig. 8
(B) Enter the FM Mode
(C) FM DX Mode
1. While the power is off, press the q
simultaneously. All the figures on the LCD lights up Fig. 9 (A) enters the TEST mode.
2. Press the r
Rotate the R129 on the PC Board Ass’y (RF33R) to adjust the LCD until the STEREO indicator lights up. Fig. 9 (D)
3. Press the r
displayed (for specific: Input level of Signal Generator is 12 ~ 28dB higher than that of the DX mode). Fig. 9 (E)
4. By pressing the w
5. Press the r
Rotate the R124 on the PC Board Ass’y (RF33R) to adjust the LCD until the STEREO indicator lights up. Fig. 10 (H).
AUDIO
AUDIO
AUDIO
button after step 1, the unit enters FM seek adjust mode of the DX mode. Fig. 9 (C)
button again after step 2, the unit enters the LOCAL mode. Check that the STEREO indicator is
BAND
button in the steps 1 to 3 enters the unit to the AM mode. Fig. 9 (F)
button, the unit enters SEEK adjustment mode of the DX mode. Fig. 9 (G)
(D) Receiving 98.1 MHz
(E) FM Local Mode
PRESET 1
button. Then keep pressing the w
Fig. 9
(F) Enter the AM Mode
(G) AM DX Mode
BAND
button, press the e
POWER
button
6. Pressing the r
displayed (for specific: Input level of Signal Generator is 12 ~ 28dB higher than that of the DX mode). Fig. 10 (I)
AUDIO
button again after step 5, the unit enters th LOCAL mode. Check that the STEREO indicator is
— 8 —
(H) Receiving 999 kHz
(K) The Moment TP ON
(N) Change the Display while AF ON
(I) AM Local Mode
(J) S. Meter Adj. Mode
(L) Change the Display while TP ON
(M) The Moment AF ON
Fig. 10
7. Press the t
TA
button in the step 1, the unit enters the S meter adjustment mode. Rotate the R208 on Main PCB to adjust
the LCD until the 0.95 lights up. Fig. 10 (J)
8. e
9. e
POWER
POWER
OFF and ON. Release the test mode.
OFF and press the y
PRESET 5
.
SG 98.1 MHz, MOD. 75kHz, INT MOD. EXT, att 66dBµ
RDS 1.0%, MOD. 30% 1 kHz, MONO, RDS ON, TP ON, SK OFF, BK OFF.
10. Confirm the “
TP
” indicator on the LCD lights up.
Fig. 10 (K) 씮 (L) soon. So RDS ON Sensitivity is OK.
(O) The Moment 107.1 MHz Receiving
(P)
Change the Display while 107.1 MHz Receiving
11. Press the q
12. Press the t
PRESET 1
TA
button for more than 2 seconds and confirm the “
button for more than 2 seconds. (Memorize the RDS).
AF
SG 107.1 MHz, MOD. 75kHz, INT MOD. EXT, att 66dBµ
RDS 1.6%, MOD. 30% 1 kHz, MONO, RDS ON, TP ON, SK OFF, BK OFF.
13. Press the q
PRESET 1
button. Confirm the receiving 107.1 MHz automatically. So the LCD indicator displays Fig. 10 (O) 씮
(P).
” indicator on the LCD lights up. Fig. 10 (M) 씮 (N) soon.
— 9 —
ELECTRICAL ADJUSTMENTS
DUMMY BOX SCHEMATIC
쎲 AM DUMMY ANTENNA
PLUG TO FIT ANTENNA
RECEPTACLE OF UNIT
METAL SHIELD CAN
AM S.G.
(50Ω)
CO-AX CABLE
30Ω 15PF
60PF
Fig. 11-1
쎲 FM DUMMY ANTENNA
PLUG TO FIT ANTENNA
RECEPTACLE OF UNIT
METAL SHIELD CAN
FM S.G.
(50Ω)
CO-AX CABLE
25Ω
Fig. 11-2
쎲 DUMMY LOAD & SWITCH BOX (FOR STEREO UNIT)
4Ω 20W
LEFT CHANNEL OUTPUT
UNIT
RIGHT CHANNEL OUTPUT
4Ω 20W
L
R
L
R
AC V.T.V.M. OR SCOPE
Fig. 11-3
— 10 —
BLOCK DIAGRAM
FOR FXD-780GD
— 11 —
BLOCK DIAGRAM
FOR FXD-780RDS
— 12 —
IC/TRANSISTOR LEAD IDENTIFICATION
TOP VIEW or SIDE VIEW
FOR FXD-780GD
36 19
118
IC401 : LC75421M-CT
48
1
IC901 : LC75823W
60
61 40
33
3249
1764
16
41
61 40
60
20 11
110
IC351 : CXA1821M-CT IC381 : LC6556-CT
48
1
IC101 : LA178IM
33
3249
1764
16
41
36
1
19
18
80 21
1
IC301 : CXD2587Q
IN
GND
IC631: KIA7806API
Q105 : 2SC4081T106-Q, R
Q106 : DTC114TKAT
Q661
Q702
Q542
Q543
OUT
2SC2412KT-Q, R
DTC143TKAT
20
Q612: KTC3199T-Y, GR
Q621: KTC3199T-Y, GR
Q633: 2SD1468ST-R, S
C
B
Q201
Q202
Q583
Q641
Q602
Q632
Q642
80 21
1
IC701 : UPD178024GC
ECB
E
Q351: 2SB815T-B6, B7
DTA124EKAT
Q701: 2SD21030TX-T
Q643: 2SD2375-Q, P
DTC124EKAT
ECB
Q601: 2SB1326T-R
Q611: 2SD1858T-Q, R
Q631: 2SB1326T-Q, R
20
1 25
IC501 : LA4743B
G2 G1
DS
Q100: 3SK263T-5
A
KK
KK
D901 : HZM6.2Z FA
Q111: FC18T-F, G
E/D
BS
CG
— 13 —
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