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Excellent printing quality.
A complete and very usefull service manual with all details.
GREAT SERVICE AT VERY LOW PRICE!
A+++++++++++++++++++++++++
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Very fast and perfect delivery. Clear and well scanned. A lot of work professionally realized.
Again thak you a lot
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This manual is accurate and of high quality. It is only volume 2 of the service manual. This is schematic, parts lists, and exploded mechanical drawings. The theory of operation and the diss-assembly instructions are in volume 1. The unit can be tricky to dis-assemble portions of so the volume 1 manual can be important. The product description of the manual is accurate but it does not say anything about volume 1 and the image of the front page does clearly say Volume 2.
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Wellll again thank you very much fast and effective. Clear and well done for such an old TV!!!!
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It has all the information you will need to fix it. The main circuit diagram is only A4 but being a PDF, you can print it to any size - I did it on two sheets of A3 and it didnt lose any detail - just made it readable when pinned up above the bench. I've found the fault, just need to buy some obscure bits to get it going again!
I cant fault the process, I paid for the manual in the morning and it was ready to download by lunch time.
HCD-GPX6/GPX7 SECTION 5 ELECTRICAL ADJUSTMENTS
DECK SECTION
1. Demagnetize the record/playback head with a head demagnetizer. 2. Do not use a magnetized screwdriver for the adjustments. 3. After the adjustments, apply suitable locking compound to the parts adjust. 4. The adjustments should be performed with the rated power supply voltage unless otherwise noted. 5. The adjustments should be performed for both L-CH and RCH. 6. Switches and controls should be set as follows unless otherwise specified.
CD SECTION
Note: 1. CD Block is basically designed to operate without adjustment. Therefore, 2. 3. 4. check each item in order given. Use YEDS-18 (3-702-101-01) unless otherwise indicated. Use an oscilloscope with more than 10M� impedance. Clean the object lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks.
RF signal waveform VOLT/DIV : 200mV TIME/DIV : 500ns
level : 0.7 ± 0.3 Vp-p
S-CURVE CHECK
� CD BOARD (Conductor Side) �
Oscilloscope CD board TP(FE) TP(VC)
REC BAIS ADJUSTMENT
Setting:
digital voltmeter (AC range) MAIN board TP101 (L), TP201 (R) TP (GND)
Procedure : 1. Connect an oscilloscope to TP (FE) and TP (VC) on the CD board. 2. Press the I/1 button to turn the power ON. 3. Load a disc (YEDS-18) and actuate the focus search. (In consequence of open and close the disc tray, actuate the focus search) 4. Confirm that the oscilloscope waveform (S-curve) is symmetrical between A and B. And confirm peak to peak level within 2.0 ± 0.5 Vp-p.
S-curve waveform symmetry
Procedure: 1. Connect a digital voltmeter (AC range) to TP101 (L), TP201 (R) and TP (GND) on the MAIN board. 2. Insert a tape. 3. 4. 5. 6. 7. Press the I/1 button to turn the power on, and press the [FUNCTION] button to select TAPE function. Press the [z REC] button twice to start recording. Adjust RV101 (L-ch), RV201 (R-ch) on the MAIN board so that the digital voltmeter reads AC 6.15 V. Connect an oscilloscope or frequency counter to TP101 (L), TP201 (R) and TP (GND) on the MAIN board. Confirm that the frequency is 82 kHz ±3 kHz.
TP (VC)
TP (FE) IC101
A within 2.0 ± 0.5 Vp-p B
TP (RFACO)
Adjustment Location:
� MAIN BOARD (Conductor Side) �
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.
REC BIAS ADJUSTMENT TP201 (R) (R-CH) (L-CH) RV101
Connecting Location: CD board
RFAC LEVEL CHECK
oscilloscope CD board
RV201 TP101 (L) TP (GND)
TP(RFACO) TP(VC)
Procedure : 1. Connect an oscilloscope to TP (RFACO) and TP (VC) on the CD board. 2. Press the I/1 button to turn the power ON. 3. Load a disc (YEDS-18) and playback. 4. Confirm that oscilloscope waveform is clear and check if RFAC signal level is correct or not.
Note: Clear RFAC signal waveform means that the shape � � � can be clearly distinguished at the center of the waveform.
Connecting Location: CD board
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