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RQ-345
RQ-345
SCHEMATIC DIAGRAM MODEL RQ-345
CIRCUIT BOARD AND WIRING
a
3
:
2
:
f
8
CONNECTION
DIAGRAM
a
VOLUME
PM DYNAMIC
SPEAKER
hn
(4.5cm)6Q
1
C1
5
:
Q2
MONITOR J1
C4
C7
l
ve
C3m
i
A
MONITOR
C10
IC1
(BA526)
Q1,2
(2SC1740SLNS)
A|
ELECTRET
PRE AMP, AGC
|
PRE/POWER AMP
CONDENSER
MICROPHONE §f
ry
RECORD/ J
PLAYBACK
os
om
BLK
HEAD
150P
3)
BATTERY. &V
aw,
—N,
DC IN J2
(UM- 3x4)
S.
=o.
6V)
=P UT
ee
ee
ee
&@
C8 0.0047
D1
D2
D)
ecrase HEAD
(20A90)
(RVDSM1A02)
>—(M)
ae
A.G.C
PROTECTOR
MOTOR
Hs ls tH
><
a
Ec]
O
cea
BATTERY avi
IC{
QI
DC IN 6V
SC pote
. 2 e
MSA)
4 (45¢m) 6.2
ELECTRICAL
PARTS LIST
Notes:
Notes: (for Circuit Board and Wiring Connection Diagram)
NOTES:
1. $1-1~S1-4:
Record/playback
switch
in "PLAYBACK"
position.
¢ The circuit shown in |
on the conductor indicates printed circuit on
BLK
; Bick
Numbering System of Resistor
Numbering System of Capacitor
(R...Record, P...PLAYBACK)
the back side of the printed circuit board.
BLU ........Blue
Example
|
:
on
Em
re
=
:
E
2. S2:
Motor ON/OFF switch.
° The circuit board diagram may be modified at any time
ese
pos
essen
eee)
fe
ee
ee,
es,
eS
ee,
BR
Volume control VR.
.
.
with the development of new technology.
GRN .......Green
Type
Wattage
Shape
Tolerance
Value
Type
Voltage
Value
Tolerance
Peculiarity
4. DC voltage measurements are taken with electronics voltmeter
L. BLU....Light Blue
(1000)
(1000 pF)
from negative terminal of battery.
NIL......... No Color Mark
sae
rae ee
ae
saa
ae
sare oe
see
epee,
gee
No mark...Playback
ORG ....... Orange
Type
Wattage
Shape
Tolerance
Value
Type
Voltage
Peculiarity
Value
5. Battery Current: NO SiQmal ............csccccssccsssessteessseesseeeeseeeesaeees 177mMA
ao pea
(2.20)
OR)
Maximum output (playback) «0.0... 850mA
SLD.......Shield Wire
Maximum output (TeCOrd) ..sscssessccssneeeesee 820mA
VUT Violet
+ This schematic diagram may be modified at any time with the
vee ase ie
ERD: Carbon
> YW:
+5%
ERG: Metal Film
ERX: Metal Film
ERQ: Fuse Type Metal
RRD: Carbon
(Chip Type)
Capacitor Type
Tolerance
i
ee
development of new technology.
ec Semmes
[ASSIA Se Zaee
MEASUREMENTS AND ADJUSTMENTS
ECKD:
Ceramic
:
PE oy 0%
ECQP:
Polypropylene
: +100%,
>
- PLAYBACK
ECET: Electrolytic
:
me
===> - RECORD/PLAYBACK
READ CAREFULLY BEFORE ATTEMPTING ALIGNMENT
QCU 2: Ceramic (Chip Type)
ECUX: Ceramic (Chip Type)
1. Make sure heads are clean.
4. Set volume control to maximum.
2. Make sure capstan and pressure roller are clean.
5. Set power source voltage to 6V DC.
3. Judgeable room temperature: 20+5°C (68-9 °F)
CAPACITORS
RESISTORS
RCBS1C562NX
ERD16TJ332
RCBS1C103NY
ERD16TJ223
ECEA0JK331
ERD16TJ101
ECEA1HK2R2
ERD25TJ273
RCBS1C152NX
ERD16TJ155
ECFT1E104MX
ERD16TJ822
RCBS1H271KB
ERD16TJ102
RCBS1C472NX
ERD16TJ820
RCBS1H471KB
ERD16TJ821
ECEA1EK3R3
ERD25TJ123
—_ Le)
INTEGRATED CIRCUIT
VARIABLE RESISTOR
= ADJUSTMENT
MEASUREMENT
ADJUSTMENT
ITEM
POINT
SPECIFICATION
POINT
REMARKS
BA526
IC, PRE/POWER AMP
VR 1
EVJ56AT12A14
Volume Control VR.
TRANSISTORS
SWITCHES
~ =—-ON
OOF
WD
— — ©
—
>
.
QZZCFM
Monitor jack
Maximum
Head adjustment
Head azimuth
(8kHz, —20dB)
(8Q)
output
screw
(Fig. 1)
2SC1740SLNS_
Transistor, PRE AMP, A.G.C.
RSH2D17Z
Slide Switch,
Record/Playback
DIODES & RECTIFIERS
QSB0294
Leaf Switch, Power ON/OFF
ECEA0JK221
ERD16TJ682
ECEA1EK4R7
ERD16TJ121
ECEA0JK470
ERD25FJ3R9
ECEA0JK101
ERD25FJ331
ECFT1E333MX
ECEA1AU331
RCBS1H681KB
RCBS1H151KB
Playback mode
20A90
Diode, A.G.C.
JACKS
RVDSM1A02
Diode, Regulator
RJJD3M6Z
Jack, Monitor
6]
Cc
Cc
Cc
Cc
Cc
Cc
Cc
C
Cc
Cc
Cc
Cc
C
Cc
Cc
Cc
C
C
RJJ97Y
Jack, DC IN
POM
a=
wo
ew
oe "OAD
OND
UW
Head Azimuth Screw
a
me
Fig. 1
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