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Even if the PDF is a scan, I can read the information I need.
The price is affordable and the service (mail sending) is very fast.
Thanks ! Regards. William (Fan of Kenwood)
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Very good quality original datasheet!I like this amazing website!!!!!!
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Excellent just what I needed to replace the electrolytic caps and make this old gem a beauty again. Was as scan of the original photocopied service manual.
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It was helpful to get schematic with waveforms in important points and lot of service information. Manual is good quality, fast delivered. Of course it is hardcopy of paper one with all its disadvantages.
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I want to give you a real heads-up for your desire to enable such people as I to acquire the information I need to maintain the older types of equipment such as this Akai HXA351W. You do a swell job with all the processes you have to perform so I can have a legible, thus usable
document which does not send me crazy trying to figure out the blurry text of a bad copy.
Very well done, Thomas.
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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