Preliminary
SECTION 4
CIRCUIT BOARD NOTES
CHARTS AND DIAGRAMS
1. Foil and Component sides
1) Foil side (B side) :
NOTES OF SCHEMATIC DIAGRAM4. Voltage measurementParts on the foil side seen from foil face (pattern face)
1) Regulator (DC/DC CONV) circuitsare indicated.
Safety precautionsREC : Colour bar signal.2) Component side (A side) :
The Components identified by the symbol arePB : Alignment tape (Colour bar).Parts on the component side seen from component face
critical for safety. For continued safety, replace safN ety: Unmeasurable or unnecessary to measure.(parts face) indicated.
critical components only with manufacturer's recom-4) Indication on schematic diagram
mended parts.Voltage Indications for REC and PB mode on the sche-
matic diagram are as shown below.2. Parts location guides
1. Units of components on the schematic diagramParts location are indicated by guide scale on the circuit board.
Unless otherwise specified.
123
1) All resistance values are in ohm. 1/6 W, 1/8 W (refer toREF No. LOCATION
REC mode2.51.8
parts list).ICCategory : IC
(5.0)
Chip resistors are 1/16 W.IC101 B C6 A
PB and REC modes
K: K?
(1000?
), M: M?
(1000K?
)(Voltage of PB and REC modesB : Foil side
PB mode
are the same)(A : Component side)Horizontal OA� zone
2) All capacitance values are in ?F, (P: PF).
3) All inductance values ?H, (m:are in mH).C : Chip componentVertical O6� zone
Note:If the voltages are not indicated on the schematicD : Discrete component)
4) All diodes are 1SS133, MA165 or 1N4148M (refer to parts
diagram, refer to the voltage charts.
list).
Note: The Parts Number, value and rated voltage etc. in
Note: For general information in service manual, please
the Schematic Diagram are for references only5.. Signal path Symbols
refer to the Service Manual of GENERAL INFORMA-
When replacing the parts, refer to the Parts List.
The arrows indicate the signal path as follows.TION Edition 4 No. 82054D (January 1994).
2. Indications of control voltageNOTE : The arrow is DVC unique object.
AUX : Active at high.
Playback signal path
AUX or AUX(L) : Active at low.
Playback and recording signal path
Recording signal path
3. Interpreting Connector indications(including E-E signal path)
Capstan servo path
1
2Removable connector
Drum servo path
3
(Example)
1
2Wire soldered directly on boardR-Y
Playback R-Y signal path
3
Y
Recording Y signal path
1
2Non-removable Board connector
6. Indication of the parts for adjustments
3
The parts for the adjustments are surrounded with the circle as
shown below.
1
2
Board to Board
3
4
Connected pattern on board
The arrows indicate signal path
7. Indication of the parts not mounted on the circuit board
Note: For the destination of each signal and further line
OOPEN� is indicated by the parts not mounted on the circuit
connections that are cut off from the diagram,
board.
refer to "BOARD INTERCONNECTIONS"
R216
OPEN
S40889-01
4-14-2 |
ACEC
