Technics RS-B105 Service Manual page 9

Hi MAIN CIRCUIT SECTION
@ ELECTRICAL PARTS LIST @ SCHEMATIC DIAGRAM
Notes: 1. Part numbers are indicated on most mechanical parts. Notes:
Please use this part number for parts order.
(This schematic diagram may be modified at any time with the develop-
L O C)
ary Sie St-1 51-3
—[=>>-
¢ All voltage values shown in circuitry are under no signal condition and
playback mode with volume control at minimum position otherwise
specified.
(Yan
ZN
0808
or 1SS254
3.3
(4.2) ]Cr02/Metai
0 28
Ce | wove [pero
INTEGRATED CIRCUITS
Nl ow ~ OO Ok
..Voitage values at record mode.
al
TRANSISTORS
Q3,4 2SK246Y FET
Q 13, 14, 15, 16, 17, 18
2$C3311-Q Transistor
Play SW
Meets ene ON with
1C1
2$C3311-Q Transistor
Q 600 2SD592ANC-Q Transistor
Q 601 2SB621A-R Transistor
Q 800 2SA1309Q Transistor
Q 900 2SD592ANC-Q_ Transistor
Overall Gain Adj.
* Caution!
IC and LSI are sensitive to static electricity.
DIODES & RECTIFIERS Secondary trouble can be prevented by taking care during
D1,2 MA165 Diode repair.
05,6
= MA165 Diode
* Cover the parts boxes made of plastics with aluminum foil.
D
D ee ea bos 603 * Ground the soldering iron.
1$R35200
Diode
* Put a conductive mat on the work table.
ae * Do not touch the legs of IC or LSI with the fingers directly. Bias
" SLASeYC LED
Current Adj.
D 703, 704, 705, 706, 707, 708
SLRS6URC LED
D 709, 710, 711, 712
@ EQUIVALENT CIRCUIT
SLRS6YC LED
D713 LN846RP LED
D 800, 801, 803, 808
1C700: AN6888
MA165 Diode
VARIABLE RESISTORS
0
Metal-0.7
2SC3311A
TAPE SELECTOR
VR 1,2 EVND4AA00B24 P.B. Gain Adj. VR
VR 3,4 EVND4AA00B54 Overall Gain Adj. VR
VR 200 EWCS5SA000A54
Input Level Control
eer VR 201 EWHFDAF15G15 Balance Control
| PartNo. | Part-Nams 8: Description
VR 301, 302
EVND4AA00B15 Bias Current Adj. VR SWITCHES
$1,800 SSH2097
Push Switch
oSCaaTtA
(Line/Mic Selector!
$201-1 $200-1 $200-2 $201-2 Dolby NR IN/OUT Selector)
phe Se
Normal+>Cr02 Normal<+Metal Normal+»Metal Normai+>Cr02
S 200, 201
L 1,2 QLQX0343KWA Bias Trap Coil
SSH3700 Push Switch
aes
L 401, 402
(Metal/CrO, Tape Selector)
SPECIFICATIONS = * Input level control... MAX
SLM1C89-K — MPX Coil
$600 A SSH1069 Push Switch
(Power ON/OFF Selector)
P|
ck S/N ratio
$900 SSP83 Leaf Switch
hte tape...QZZCFM
Greater than 45dB
F
TRANSFORMERS
(Motor Switch)
pes:
S$ 901 SSP83 Leaf Switch (Play Switch)
- F
T300 SLO9C19-K
_Bias Oscillation Coil
$902 SSP83 Leaf Switch (Mute Switch)
Overall distortion
Normal......
...QZZCRX for CrO,
...QZZCRZ for Metal
T 600
[EK] A SLT5K236SA AC Power Transformer
T 600 [E]
[EGA] A SLT5K235SA AC Power Transformer
T 600
Metal(4.9)
Cr02(3.0)
~4.9 (0) Less than 4%
QJA0454ZC Mic Jack
* Test tape...QZZCRA (without NAB filter)