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1-2.
EXPLODED VIEW
NOTE:
• -XX and -X mean standardized parts, so they
• Items marked "*" are not stocked since they
may have some difference from the original
are seldom required for routine service. Some
one.
delay should be anticipated when ordering
• Color Indication of Appearance Parts
these items.
Example:
• The mechanical parts with no reference num-
ber in the exploded views are not supplied.
KNOB, BALANCE (WHITE) . . . (RED)
↑
↑
Parts Color Cabinet's Color
MECHANISM DECK SECTION
(MG-25F-136)
159
158
155
154
157
#6
156
153
152
Ref. No.
Part No.
Description
151
A-3291-667-A CLUTCH (FR) ASSY
* 152
3-019-130-01 LEVER (LDG-A)
* 153
3-019-131-01 LEVER (LDG-B)
154
3-020-539-01 SPRING (LD-1), TENSION
155
3-020-540-01 SPRING (LD-2), TENSION
156
3-020-542-01 GEAR (LOADING FT)
157
3-341-753-11 WASHER, POLYETHYLENE
158
3-020-533-01 HOUSING
* 159
3-020-532-01 ARM (SUCTION)
160
3-020-534-01 HANGER
161
3-933-346-01 CATCHER
160
163
A
161
162
A
164
165
#7
168
168
166
167
151
Remark
Ref. No.
Part No.
Description
162
3-933-344-01 GUIDE (C)
163
3-014-798-01 SCREW (HEAD), SPECIAL
164
3-364-151-01 WASHER
165
A-3301-267-A CHASSIS ASSY (F)
166
3-017-302-01 BELT (25)
167
3-936-853-01 FLYWHEEL (F)
168
3-701-437-21 WASHER
HP901
1-500-157-21 HEAD, MAGNETIC (PLAYBACK)
M901
A-3291-665-A MOTOR ASSY, MAIN (CAPSTAN/REEL)
#6
7-624-104-04 STOP RING 2.0 TYPE-E
#7
7-627-553-17 PRECISION SCREW +P 2X2 TYPE3
– 5 –
2. MAIN BOARD MODIFICATION
• New/Former Discrimination
[MAIN BOARD] (COMPONENT SIDE)
HP901
M901
2-1.
NOTE FOR PRINTED WIRING BOARD AND SCHEMATIC DIAGRAM
Note on Printed Wiring Board:
• X : parts extracted from the component side.
•
: parts mounted on the conductor side.
p
•
: internal component.
¢
• b : Pattern from the side which enables seeing.
Remark
Former type: 1-664-751-11
New type
: 1-664-751-12
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and
1
/
W or less unless otherwise
4
specified.
•
: internal component.
¢
• C : panel designation.
• U : B+ Line.
• Power voltage is dc 14.4 V and fed with regulated dc power
supply from battery and accessory terminals.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
(
) : AM (MW)
〈〈
〉〉 : TAPE PLAYBACK
∗
: Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
f
: AM (MW)
E
: TAPE PLAYBACK
• Abbreviation
105
: EXR-105
3740 : XR-3740
– 6 –
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