R
- 910DVD-CD
ManualService
CD-910DVD
|
CONTENTS |
|
Page |
Disassembly Instructions..................................................................................................................................... |
3 |
Disassembly Diagram.......................................................................................................................................... |
4 |
Operation Check.................................................................................................................................................. |
5 |
Block Diagram ..................................................................................................................................................... |
6 |
Alignment Locations ............................................................................................................................................ |
7 |
Alignment Procedures ......................................................................................................................................... |
8 |
Printed Circuit Boards........................................................................................................................................ |
10 |
Wiring Diagram .................................................................................................................................................. |
17 |
Exploded Views (Panel)..................................................................................................................................... |
18 |
Exploded View Parts Lists (Panel)..................................................................................................................... |
19 |
Exploded Views (Cabinet) ................................................................................................................................. |
20 |
Exploded View Parts Lists (Cabinet) ................................................................................................................. |
21 |
Schematic Diagram ........................................................................................................................................... |
23 |
Electrical Parts List ............................................................................................................................................ |
29 |
Specifications..................................................................................................................................................... |
34 |
2
DISASSEMBLY INSTRUCTIONS
1.Using the unlock key that came with the unit or a similar tool, unlock the mounting box and remove toward the Rear of the unit.
2.Remove two screws (A) located on the Cabinet Top then remove the Cabinet Top.
3.Remove two screws (B) located on the Cabinet Bottom then remove the Cabinet Bottom.
4.Remove two screws (C) (one located at the left side and one located at the right side of the front cabinet) then remove two Hooks.
6.Remove the screw (D) from on the left side of the left bracket and remove the screw (E) from on the right side of the right bracket.
7.Remove two screws (F) from on the rear bracket then remove the Deck.
8.Take Out the Panel and the Ring.
Remove two screws (G) from each side of the base then remove the Base.
9.Remove two screws (H) from on the right bracket then remove the Tooth Bracket and the Tune Top Tooth. Slide off the Nut and the Stop Washer then remove the Brass Bush and the Tuning Shaft /Tuner.
9.Remove the screw (I) and two screws (J) from on the right bracket then remove the Tune FIX Support. Remove the screw (K) from on the right bracket and remove three screws (L) from under the right bracket and remove the 2BND Tuner and the Tuner Support.
10.Remove two screws (M) from on the back of the rear bracket and Slide off two Nuts then remove the DC FAN 12V.
Remove five screws (N) from on the back of the heat sink then remove the Heat Sink and the Heat Sink Adaptor.
Remove two screws (O) from on the back of the rear bracket then remove the 22PIN Socket.
11.Remove the screw (P) from on the left bracket then remove the Transistor Holder.
12.Remove three screws (Q) from under the main board then remove the Main Board.
13.Remove two screws (R) from on the left bracket then remove the Left Bracket.
14.Remove two screws (S) from the right bracket then remove the Right Bracket and the Rear Bracket.
3
DISASSEMBLY DIAGRAM
4
OPERATION CHECK
GENERAL SPECIFICATIONS OF SIGNAL
Standard frequency |
FM |
98.1 MHz |
(87.5, 108 MHz) |
|
MW |
1000 kHz |
(522, 1620 kHz) |
Signal output |
FM |
1 mV |
|
|
MW |
5 mV |
|
Modulation |
MW |
400 Hz |
30% MOD. |
|
FM Stereo |
1 kHz |
75 kHz DEV. |
|
|
|
46% for L only or R |
|
|
|
only pilot level 8%. |
AF output level |
FM/MW |
|
|
Power source voltage |
DC 14.4V (Backup voltage is the same as this) |
||
AF load impedance |
4 ohm pure resistance |
|
|
Balance |
Center position of level |
|
|
Tone |
Center position. |
|
|
The signal strength read in this section is voltage on the antenna.
|
|
Test Diagram |
|
2-SPEAKER |
4-SPEAKER |
4-SPEAKER |
2-SPEAKER |
|
RL. |
RR. |
|
|
SPK. |
|
|
FRONT |
SPR. |
|
FRONT |
|
|
||
SPK. |
|
|
SPK. |
|
FL. |
FR. |
|
|
SPK. |
SPE. |
|
MAIN UNIT
DISTORTION |
|
|
DUMMY |
|
VTVM |
VTVM |
ANTANNA |
||
METER |
||||
|
ACC (DV14.4V)
BACK UP (14.4V)
GROUND
POWER ANTANNA
ANT
MPX
STEREOS
MODULATOR
AM SG |
FM SG |
5
BLOCK DIAGRAM
6
ALIGNMENT AND PROCEDURES
FM IF/RF ADJUSTMENT
Equipment required
●FM IF/RF signal generator
●Oscilloscope
●FM Stereo signal generator
●Solid-state voltmeter (SSVM)
●Regulated DC power supply
●Distortion meter
FM IF and RF Alignment Using FM Signal Generator
Note: Press the radio power switch to on the radio. Signal generator output must be kept as low as possible to avoid overload and dipping
Step |
Generator |
Generator |
Display |
Adjustment |
Remark |
|
Coupling |
Setting |
Setting |
|
|
|
|
|
|
|
|
IF |
FM RF signal |
10.7 MHz |
98.1 MHz |
T102 |
Adjust so that |
|
Generator to |
Sweep output |
|
|
maximum AF |
|
Antenna |
30dB/µV |
|
|
output power and |
|
Input. |
|
|
|
minimum |
|
|
|
|
|
distortion |
76 kHz pilot |
Signal generator |
75 kHz Dev. |
98.1 MHz |
VR2 |
Adjust to |
Modulation |
to antenna |
90% for L only |
|
|
76 kHz |
|
receptacle |
or R only pilot |
|
|
|
|
|
level 10% |
|
|
|
Stereo |
Signal |
98.1 MHz |
98.1 MHz |
VR1 |
Adjust AF |
Separation |
Generator to |
int. 1 kHz |
|
|
Output power |
|
antenna |
Dev. 75 kHz |
|
|
For maximum |
|
|
L + R = 92% |
|
|
Separation |
|
|
Pilot = 8% |
|
|
|
Note: The tuner module is well-aligned and adjustment is not recommended
7
AM IF/RF ADJUSTMENT
Equipment required
zAM IF/RF signal generator
zSolid-state voltmeter (SSVM)
zRegulated DC power supply
z2-CH voltmeter
zDistortion meter
AM IF and RF Alignment Using AM Signal Generator
Note: Press the power switch to on the radio. Signal generator output must be kept as low as possible to avoid overload and clipping
Step |
Generator |
Generator |
Display |
Adjustment |
Remark |
|
Coupling |
|
Setting |
|
|
IF |
AM RF |
450 kHz Sweep |
530 kHz |
T101 |
Adjust so that |
|
Signal |
Output |
|
|
maximum left and |
|
Generator to |
60dB/µV |
|
|
right are |
|
Antenna. |
|
|
|
symmetrical |
FREQ. |
|
|
530 kHz |
T106 |
|
Low |
|
|
1710 kHz |
CT103 |
|
FREQ. |
|
|
|
|
|
High |
|
|
|
|
|
RF |
Signal |
600 kHz Int. |
600 kHz |
T107 |
Adjust AF output |
|
Generator |
400Hz 30% |
|
CT102 |
power for |
|
to antenna |
Mod output |
|
|
maximum |
|
receptacle |
20dB/mV |
|
|
|
RF |
Signal Generator |
1000kHz Int. |
1400 kHz |
VC101 |
Adjust AF output |
Count |
To antenna |
400Hz 30% mod. |
|
|
power for |
|
receptacle |
Output 20 dB/mV |
|
|
maximum |
Note: The tuner module is well-aligned and adjustment is not recommended.
8
PRINTED CIRCUIT BOARDS
MAIN BOARD
TOP VIEW
9
MAIN BOARD
BOTTOM VIEW
10
KEY BOARD
TOP VIEW
11
KEY BOARD
BOTTOM VIEW
12
DISPLAY BOARD
TOP VIEW
13
DISPLAY BOARD
BOTTOM VIEW
14
Loading...