Hitachi TRKW 550 Service Manual

Page 1

TY No. 484E
@ HITACHI TRK-W550

SE RVI C E MA N UAI. (H,HC,E,E(BS),W,AU)

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CONTENT S-x
SPECIFICATIONS ..................... 1
DISASSEMBLY ...................... 2
DIAL INDICATOR SETTING METHOD A . . . . 3
ADJUSTMENT ....................... 4
PRINTED WIRING BOAD ......... 10-12,16-25
CIRCUIT DIAGRAM ......... 13-15,26-28
WIRING DIAGRAM .......... , 29
BLOCK DIAGRAM ......... . . , .31
DISCRIPTION OF NEW PARTS ............ 34
EXPLODED VIEW ..................... 36
REPLACEMENT PARTS LIST .............. 39
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SAFETY PRECAUTIONS
The followmg precautions should be observed when servrcmgl
1. Smce many parts in the UNIX have specral 531er related characteristics. always use genuine Hltachls replacement parts.
Espec-ally critical parts in the power crrcuit block should not be replaced With other makers,
Crmcal parts are marked with A In the crrcult dlagram and primed wrung board.
2. Belore returning a repaired unit to the customer, the service technician must thoroughly test the um: to ascertain that I!
is completely safe to operate wlthou! danger ol elecmcal shock.
SPECIFICATIONS
. RADIO SECTION
. Circuit Systam: FM/AM 2-band Superheterodvne [For sgnsmmy: FM: 10 dB (pram)
HIHCI 2 dB (maxJ
FM/SW/MW/LW 4-band Superhetero- sw; 30 dB (pm)
dY"? [For E, EIBSII 25 dB (max.l
FM/SWZ/SWl/MW 4-band Superhete- swz; 30 d8 (praJ
rodyne [For W, AU) 20 dB (maxJ
Tuning Range: FM: 88 {0108 MHz [For H4 H6, W, AU! SW1: 50dB (Dra.l
FM: 87.5t0108MHZIForE,ElBSl] 35dB (max)
SW: 6 to 18 MHz [For E, ElBSl] MW (AM)? 50 dB (WE-I
SW2: 7 to 22 MHz [For W, AU] 35:18 (max)
SW1: 23 «)7 MHz [ForW, AU] LW: 57dB IONS.)
MW (AM): 530 to 14605 kHz 45 dB (max)
LW: 150 to 285 kHI [For E, EIBSH Antennas
Intermediate FM: 10.7 MHz (Aerials): FM/SW (SW2): Telescopic antenna
Frquencv: MW (AM): 465 kHz [For E, ElBSH SW1/MW (AMI/LW: Built in
MW (AM): 455 kHz [For H, HC, W, ferrite~core
AU] antenna

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.

PORTABLE COMPONENT SYSTEM

February 1986 TOYOKAWA WORKS

Page 2

TRK-W550 I

0 TAPE RECORDER SECTION 0 GENERAL SECTION
Tape: Cassette tape Semiconductors: le: 10 [For H, HC, W, AU]
Track System: 4 track 2 channel stereo 11 [For E, EiBSl]
Tape Speed: - 4.75 cm/sec: Translstors: 23 (For H, HC, W, AU]
Recording System: AC bias (TAPE 2) 24 [For E, E(BS)]
Erosinq System: AC erase (TAPE 2) Diodes: 25 [For W, AU]
Frequency 24 [Except W, AU]
Response: Normal: 30 to 13,000 Hz LEDs: 3
METAL: 30 to 14,000 Hz Power Supply: AC: 120 V, 60 Hz [For H, HC]
Signal to Noise AC: 220 V, 50 Hz [For E]
Ratio: 50 dB AC: 240 V, 50 Hz [For E (88), AU]
Wow and Flutter: 0.08% (W-RMS) AC: 110 -127V/200 - 220Vl230 '-
Cross Talk: Between tracks: 65 dB 250V,50l60Hz [For M
Between channels= 40 dB DC: 15 v ("D" CELL (iEC R20lx 10
Output Load or equivalent)
Impedance: Mlxlng mic:1.6 mV, 4 kn Power Consumption: 30W [For W!
Llne-ln: 600 mV, 47KB [For H, HC, W, AU] 35w (For H, HC]
CD-in: 650 mV, 47m [For H. HC,W, AU] 45w [For E, EKBS), Au]
Phone-in: 6 mV, 47 kn [For E, E(BSl] Power Output: 60 W P.M.P.(AC operation)
0 L CD/Llne-ln:650mV. 47km [For E, EiBSl] [Except H, HC]
utput owl and
MW... m
Distortion: :eakers 2'8 to 8 n - . Tweeter: 2 cm, 500 0 (X4) .
Erasing Ratio: 65w DI'lImSIons: 642 (w) )5 230 (H)'x 188 (D) mm
Fest Forwarding or Wlllm: 8.0 kg (wrth batteries)
Rewinding time: TAPE 1: 120 sec
TAPE 2: 150 sec
Motor: DC motor
DISASSEMBL Y

1. How to remove the speaker box (Fig .1)
Release one clip to the arrow direction and remove the
speaker box by pulling upward. (both side) Cassette doors

Speaker box /

Mic volume
control knob

Graphic equalizer
oontrol knobs

Volume control knobs

0' Fig.2

Fig.1

2.How to remove the Front panel (Fig. 2, 3)
Remove two screws 6) , three screws ® and one
screw ® which is in the battery case.
Then open the cassette doors and pull the front panel.
(Screw ® is except W, AU)

Note.Eight knobs come off toqether when pull the
front panel.