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The purchased manual is an high quality scan of the original Philips paper-based Service Manual. I am very satisfied!
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The purchased manual is an scan of the original Panasonic paper-based Service Manual. Unfortunately the contrast is not perfect, but I am satisfied anyway!
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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.
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It paid to find this Service Manual, couldn't find it anywhere else. Exactly what I wanted. Received within 24 hours.
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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.
HCD-GB3
Adjustment Location: Record/Playback/Erase Head
CD SECTION
Note: 1. CD Block is basically constructed to operate without adjustment. 2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated. 3. Use an oscilloscope with more than 10 M� 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. 5. Check the focus bias check when optical pick-up block is replaced.
FOCUS BIAS CHECK
oscilloscope (DC range) BD83S board TP (RFACI) TP (VC)
+ �
Procedure : 1. Connect oscilloscope to TP (RFACI) and TP (VC) on the BD83S board. 2. Press the I/1 button to turn the power ON, and press the Z (CD) button to open the CD disc tray. 3. Set disc (YEDS-18) on the tray and press the CD 7 button to playback. 4. Confirm that oscilloscope waveform is as shown in the figure below. (eye pattern) A good eye pattern means that the diamond shape (�) in the center of the waveform can be clearly distinguished.
VOLT/DIV: 200 mV TIME/DIV: 500 ns
level: 0.9 ± 0.4 Vp-p
Checking Location: � BD83S Board (SIDE B) �
TP (VC)
IC201
TP (RFACI)
17
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