Preliminary
CIRCUIT BOARD NOTES
CHARTS AND DIAGRAMS
1. Foil and Component sides
NOTES OF SCHEMATIC DIAGRAM4. Voltage measurement1) Foil side (B side) :
1) Regulator (DC/DC CONV) circuitsParts on the foil side seen from foil face (pattern face)
Safety precautionsREC : Colour bar signal.are indicated.
The Components indentified by the symbol!arePB : Alignment tape (Colour bar).2) Component side (A side) :
critical for safety. For continued safety, replace safety?: Unmeasurable or unnecessary to measure.Parts on the component side seen from component face
critical components only with manufacturer's recom-2) Indication on schematic diagram(parts face) indicated.
mended parts.Voltage indications for REC and PB mode on the sche-
rts location are indicated by guide scale on the circuit board.
matic diagram are as shown below.
2. Parts location guides
1. Units of components on the schematic diagram
Parts 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 to
REC mode2.51.8REF No. LOCATION
parts list).(5.0)
Category : IC
Chip resistors are 1/16 W.IC
PB and REC modesIC101 B C6 A
K: K&(1000&), M: M& (1000K&)(Voltage of PB and REC modes
PB mode
are the same)B : Foil side
2) All capacitance values are in ?F, (P: PF).
(A : Component side)Horizontal ?A? zone
3) All inductance values are in ?H, (m: mH).
4) All diodes are 1SS133, MA165 or 1N4148M (refer to partsNote: If the voltages are not indicated on the schematicC : Chip componentVertical ?6? zone
D : Discrete component)
list).diagram, refer to the voltage charts.
Note: The Parts Number, value and rated voltage etc. in
the Schematic Diagram are for references only. 5. Signal path SymbolsNote: For general information in service manual, please
When replacing the parts, refer to the Parts List.
The arrows indicate the signal path as follows.refer to the Service Manual of GENERAL INFORMA-
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
?OPEN? 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
2-12-2 |
ACEC
