|
|
|
Who's Online
There currently are 330 guests online. |
|
Categories
|
|
Information
|
|
Featured Product
|
|
|
 |
|
|
There are currently no product reviews.
 ;
The document was usefull, and it was exactly what I was looking for.
;
OK?..manual is complet and helpfull... for repairing such a old and rare boombox like JVC PCM it is necessary...
;
Super Anleitung. Ordentliche Auflösung. Das ganze noch in Deutsch wäre zu schön. Alle Datenblätter sind sauber Kopiert und alle Leitungswege sind sauber ausgeführt
;
Thanks God for the internet and thanks for the service like this - proffessional solution on time.
;
About the service it's very fast and reliable. About the manual the quality is high enough to read even the tiniest details on the wiring diagrams so you can't ask much more than that, let it alone for a manual of a product from 20 years ago. Thank you, very satisfied.
MDR-RF915R/RF945R
TABLE OF CONTENTS
Specifications ............................................................................ 1 3-5. Free Run Frequency Check and Adjustment (MRD-RF945R) ......... 6 3-6. Receive Frequency Check and Adjustment (MRD-RF945R) ......... 6 3-7. Carrier Modulation Check (MRD-RF945R) ............... 6 3-8. Separation Check (MRD-RF945R) ............................. 6
1. GENERAL ....................................................................... 2 2. DISASSEMBLY
2-1. RX-BASE Board ...................................................... 3
3. ELECTRICAL ADJUSTMENTS .............................. 4
3-1. Free Run Frequency Check and Adjustment (MRD-RF915R) ....... 5 3-2. Receive Frequency Check and Adjustment (MRD-RF915R) ....... 5 3-3. Carrier Modulation Check (MRD-RF915R) ............. 5 3-4. Separation Check (MRD-RF915R) ........................... 5
4. DIAGRAMS
4-1. Block Diagrams ........................................................... 8 4-2. Schematic Diagram ..................................................... 9 4-3. Printed Wiring Board ................................................. 10
5. EXPLODED VIEWS........................................................11 6. ELECTRICAL PARTS LIST........................................12
SECTION 1 GENERAL
This section is extracted from instruction manual.
5- A Turn up the volume to a moderate
level with the VOL control. Press the TUNING button briefly for automatic tuning of the headphones. If you do not receive a clear audio signal, press it again.
Auto power on/off function When you remove the headphones from your head, the power turns off automatically. Do not allow the self adjusting band to be pulled up, otherwise the headphones will be switched on.
A MDR-RF945RK
TUNING button VOL control
The power turns on.
SAFETY CHECK-OUT
After correcting the original service problem, perform the following safety checks before releasing the set to the customer.
5- B Turn up the volume to a moderate
level with the VOL control, then tune the headphones in to the frequency of the transmitter with the TUNING control until you can hear the audio signal loud and clear.
1. 2. 3.
Check the area of your repair for unsoldered or poorly-sol deredconnections. Check the entire board surface for solder splashes and bridges. Check the interboard wiring to ensure that no wires are âpinchedâ or contact high-wattage resistors. Look for unauthorized replacement parts, particularlyt ransis
BMDR-RF915RK
TUNING control VOL control
Try the above steps 3 and 5 until the receiving performance becomes better.
tors, that were installed during a previous repair. Point them out to the customer and recommend their replacement. 4. Look for parts which, through functioning, show obvious signs of deterioration. Point them out to the customer and recommend their replacement. 5. Check the B+ voltage to see it is at the values specified. 6. Flexible Circuit Board Repairing ⢠Keep the temperature of the soldering iron around 270°C during repairing. ⢠Do not touch the soldering iron on the same conductor of the circuit board (within 3 times). ⢠Be careful not to apply force on the conductor when soldering
2
|
|
|
> |
|
