|
|
|
Who's Online
There currently are 5277 guests online. |
|
Categories
|
|
Information
|
|
Featured Product
|
|
|
 |
|
|
There are currently no product reviews.
 ;
The purchased manual is an high-quality scan of the original JVC paper-based Service Manual. The Service Manual includes the Owner´s Manual, so you do not have to buy both of them.
 ;
It paid to find this Service Manual, couldn't find it anywhere else. Exactly what I wanted. Received within 24 hours.
;
Complete manual with clear schematic diagrams and printed circuit board layouts of two variants of the headset and the transmitter an old and a new version.
Also shows how the headset and the transmitter is opened and how transmitter and receivers can be adjusted and where to measure.
I had no problems to repair the headset using this service manual.
;
Excellent printing quality. A complete and very useful manual with all details.
;
This is a great site. I placed my order and by the next am it was available for download. Had some problems with some missing copy on some pages. Once I brought the error to the OMC's attention, the issue was resolved. I'll come back again.
HCD-EP515
SECTION 5 ELECTRICAL ADJUSTMENTS
CD SECTION
Note: 1. CD Block is basically designed to operate without adjustment. Therefore, check each item in order given. 2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated. 3. Use an oscilloscope with more than 10M� impedance. 4. Clean the object lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks.
RFDC signal waveform
VOLT/DIV: 200 mV TIME/DIV: 500 ns
level: 1.15 ± 0.35 Vp-p
S-curve Check Connection:
oscilloscope CD board TP (FE) TP (DVC)
+ �
Checking Location: CD board (Conductor side) RFAC Level Check Connection:
oscilloscope CD board
Procedure: 1. Connect an oscilloscope to test point TP (FE) and TP (DVC) on the CD board. 2. Turn the power on. 3. Put the disc (YEDS-18) in and turned power switch on again and actuate the focus search. (actuate the focus search when 4. disc table is moving in and out) Check the oscilloscope waveform (S-curve) is symmetrical between A and B. And confirm peak to peak level within 2 ± 1 Vp-p.
S-curve waveform
TP (RFAC) TP (VC)
+ �
Procedure: 1. Connect an oscilloscope to test point TP (RFAC) and TP (VC) on the CD board. 2. Turn the power on. 3. Put the disc (YEDS-18) in to playback the number five track. 4. Confirm that oscilloscope waveform is clear and check RFAC signal level is correct or not.
Note: A clear RFAC signal waveform means that the shape ��� can be clearly distinguished at the center of the waveform.
symmetry
RFAC signal waveform
A within 2 ± 1 Vp-p B
VOLT/DIV: 200 mV TIME/DIV: 500 ns
level: 1.35 ± 0.4 Vp-p
Note: � Try to measure several times to make sure than the ratio of A : B or B : A is more than 10 : 7. � Take sweep time as long as possible and light up the brightness to obtain best waveform.
Checking Location: CD board (Conductor side) RFDC Level Check Connection:
oscilloscope CD board TP (RFDC) TP (DVC)
+ �
Checking Location: CD board (Conductor side) (See page 14)
Procedure: 1. Connect an oscilloscope to test point TP (RFDC) and TP (DVC) on the CD board. 2. Turn the power on. 3. Put the disc (YEDS-18) in to playback the number five track. 4. Confirm that oscilloscope waveform is clear and check RFDC signal level is correct or not.
Note: A clear RFDC signal waveform means that the shape ��� can be clearly distinguished at the center of the waveform.
13
|
|
|
> |
|
