Akai HX-R40 User manual

AKAT Servite manuat
STEREO CASSETTE DECK
move. HX=-R4Q0

ABBREVIATIONS FOR SERVICE MANUAL
MODEL HX-R40
ABBREVIATION EXPLANATION
ADJ ADJustment
CAM M CAM Motor
Dolby NR Dolby Noise Reduction
EQ EQualizer
FF Fast Forward
FREQ FREQuency
FWD ForWarD
FWD AR ForWarD Anti Record
H High level
HD High Density
IND INDicator
IPLS Instant Program Location System
L Low level
OSC OSCillator
PB Play Back
Q REV Quick REVerse
REC RECord
REEL M REEL Motor
REEL M P/F REEL Motor Play/Forward
REG REGulator
REV REVerse
REV AR REVerse Anti Record
SW SWitch
VR Variable Resistor
VREG Voltage REGulator

STEREO CASSETTE DECK
wove. HX-R40
SECTION 1 SERVICE MANUAL .................... 3
SECTION 2 PARTS LIST .......................0... 17

SAFETY INSTRUCTIONS
SAFETY CHECK AFTER SERVICING
Confirm the specified insulation resistance between power cord plug prongs and externally exposed parts of the set is
greater than 10 Mohms, but for equipment with external antenna terminals (tuner, receiver, etc.) and is intended for
or [A], specified insulation resistance should be more than 2.2 Mohms (ground terminals, microphone jacks,
headphone jacks. line-in-out jacks etc.)
PRECAUTIONS DURING SERVICING
1. Parts identified by the A\ symbol parts are critical for safety.
Replace only with parts number specified.
2. In addition to safety, other parts and assemblies are specified for conformance with such regulations as those
applying to spurious radiation. These must also be replaced only with specified replacements.
Examples: RF converters, tuner units, antenna selector switches, RF cables, noise blocking capacitors, noise
blocking filters, etc.
3. Use specified internal wiring. Note especially:
1) Wires covered with PVC tubing
2) Double insulated wires
3) High voltage leads
4. Use specified insulating materials for hazardous live parts. Note especially:
1) Insulation Tape
2) PVC tubing
3) Spacers (Insulating Barriers)
4) Insulation sheets for transistors
5) Plastic screws for fixing microswitch (especially in turntable)
5. When replacing AC primary side components (transformers, power cords, noise blocking capacitors, etc.), wrap
ends of wires securely about the terminals before soldering.
— c>
Observe that wires do not contact heat producing parts (heatsinks, oxide metal film resistors, fusible resistors, etc.).
Check that replaced wires do not contact sharp edged or pointed parts.
Also check areas surrounding repaired locations.
Use care that foreign objects (screws, solder droplets, etc.) do not remain inside the set.
oD
VOLTAGE CONVERSION
Models for Canada, USA, Europe, UK and Australia are not equipped with this facility. Each machine is preset at the
factory
according
to
destination,
but
some
machine
can
be
set
to
110V,
120V,
220V,
or
240V
as
required.
If your machine’s voltage can be converted:
Before connecting the power cord, turn the VOLTAGE SELECTOR located on the rear panel with a screwdriver until
the correct voltage is indicated.
VOLTAGE
SELECTOR
CYCLE CONVERSION
Cycle conversion are not necessary since HX-R40 use a DC MOTOR.

IL
Il.
VI.
VIL.
VIIL
X.
SECTION 1
SERVICE MANUAL
TABLE OF CONTENTS
SPECIFICATIONS. 5.00002. 65 gee Stew bw HR ee ee eee 4
DISMANTLING OF UNIT ................ 0. eee eee ees 5
CONTROLS | 2 esi scc cose e cok we ted Bhs Bin eines EERE a EARS 6
PRINCIPAL PARTS LOCATION ........... 0.0.0. ee eee eee ene 7
MECHANISM EXPLANATION OF EACH MODE.................. 8
5-1. DIRECT OPERATIONS RESULTING BY MOVEMENTS OF
THE MAIN GEAR WHEEL ..... 8
FIXING PROCEDURES FOR CAM WHEEL AND
ROTARY ENCODE PCB..... 11
MECHANICAL ADJUSTMENT .......... 0.000000. 02: eae eee 12
7-1. PINCH ROLLER PRESSURE MEASUREMENT ............... 12
7-2. WINDING TORQUE MEASUREMENT IN EACH MODE ........ 12
7-3. TAPE SPEED ADJUSTMENT .......... 2.0.0.0... 0000s eee 12
HEAD ADJUSTMENT .. 2.2.2.0... . cece cece eee ees 13
8-1. TAPE GUIDE HEIGHT ADJUSTMENT..................... 13
8-2. HEAD HEIGHT ADJUSTMENT ......................0... 13
8-3. REC/PB HEAD AZIMUTH ALIGNMENT ADJUSTMENT ........ 13
ELECTRICAL ADJUSTMENT ..........0.. 0.000.000 ee eee eee ee 14
9-1. QUICK REVERSE SENSITIVITY ADJUSTMENT.............. 14
9-2. PRE-AMP ADJUSTMENT............... 0.0.0... .0 000000. 1S
PC BOARD TITLES AND IDENTIFICATION NUMBERS............ 16
For basic adjustments, measuring methods, and operating principles, refer to GENERAL
TECHNICAL MANUAL.
SERVICE MANUAL

SPECIFICATIONS
TRACK SYSTEM
4 track 2 channel stereo
TAPE Phillips type cassette
HEADS HD head for recording and playback x 1
Erase head x 1
MOTORS Electronically speed controlled DC motor for capstan drive x 1
DC motor for reel drive x |
DC motor for cam drive x 1
WOW & FLUTTER
FOR J-MODEL
0.05% WRMS (JIS), 0.12% (DIN)
+0.07% W. Peak (EIAJ), 0.05% WRMS
FREQUENCY RESPONSE
NORMAL
CrO,
METAL
20 Hz to 17,000 Hz + 3 dB
20 Hz to 18,000 Hz + 3 dB
20 Hz to 19,000 Hz + 3 dB
S/N (METAL)
FOR J-MODEL
DOLBY B TYPE NR SWITCH ON
DOLBY C TYPE NR SWITCH ON
59 dB
58 dB (EIAJ)
Improves up to 5 dB at 1 kHz, 10 dB above 5 kHz
Improves up to 15 dB at 500 Hz, 20 dB at 1 kHz to 10 kHz
HARMONIC DISTORTION (METAL)
FOR J-MODEL
Less than 0.8%
0.8% (EIAJ)
INPUT SENSITIVITY/IMPEDANCE
MIC
LINE
OUTPUT SENSITIVITY/IMPEDANCE
LINE
HEADPHONES
0.25 mV/5 kohms (Required microphone impedance 600 ohms)
70 mV/47 kohms
388 mV/2 kohms
0.3 mW (8 ohms)/82 ohms
POWER REQUIREMENTS
120V, 60 Hz for USA & Canada
220V, 50 Hz for Europe except UK
240V, 50 Hz for UK & Australia
110V/120V/220V/240V, 50 Hz/60 Hz
convertible for other countries
POWER CONSUMPTION 17W
FOR J-MODEL 14W
DIMENSIONS 440 (W) x 110 (H) x 250 (D) mm
(17.3 x 4.3 x 9.8 inches)
WEIGHT 4.3 kg (9.5 Ibs)
* For improvement purposes, specifications and design are subject to change without notice.
$e SERVICE MANUAL
4

Il. DISMANTLING OF UNIT
3
UPPER COVER
In case of trouble, etc. necessitating dismantling, please
dismantle in the order shown in the photographs.
Reassemble in reverse order.
anni
SCREWS
1 4
CASSETTE LID
FRONT PANEL
W SCREWS
| SCREWS
SERVICE MANUAL

lil. CONTROLS
EJECT (@) PEAK METER
BUTTON
TAPE SELECTOR
TAPE COUNTER
RESET BUTTON
DIRECTION INDICATOR
TAPE COUNTER DOLBY NR SWITCH
AND SELECTOR
CASSETTE HOLDER
AND LID
TAPE TRANSPORT
BUTTONS
| Pee fe ee a
TIMER START MIC JACKS
SELECTOR
REV SELECTOR REC LEVEL
CONTROL
POWER
SWITCH
PHONES
JACK
REC
BALANCE
CONTROL
Fig. 3-1 Front View
rn
SERVICE
MANUAL
6

IV. PRINCIPAL PARTS LOCATION
TAPE SELECTOR SW
Swi
POWER SW SWI
TAPE COUNTER METER PCB
T2077B5020
a
a
. *
fy. in c ’ ad i
REC LEVEL VR VRI
REC BALANCE vR vRi——+
Fig. 4-1 Front View
r-—- POWER TRANSFORMER T90I VOLTAGE SELECTOR VS9OI -—— PRE AMP PCB
T2077(U) ({U] MODEL ONLY ) T2077 A
T2077(J) aac
T2077(C, 504A
T2077(E, 505A [E.V.B:S]
T2077(B,
CAM MOTOR CONTROL(B)A PCB
M903 CMR30CSIOA
—— REEL MOTOR SW LEAF PCB
M902 CMR30C5030
— CAPSTAN MOTOR
M90!
Fig. 4-2. Top View ([U] model)
SERVICE MANUAL

V. MECHANISM EXPLANATION OF EACH MODE
The operating functions are controlled by the rotary
encoder. The main cam wheel is rotated to the set point.
Here, we shall explain the mechanism functions:
The main cam wheel is driven by the cam motor through
cam gears (B) and (C).
5-1. DIRECT OPERATIONS RESULTING BY MOVEMENTS OF THE MAIN GEAR WHEEL
1) Pinch roller (Refer to Fig. 5-1)
CAPSTAN
PINCH
ROLLER
CAM MOTOR
Meigs GEAR (B)
KOK
\we——- CAM GEAR (C)
\Y
\Y
Why's
MAIN CAM WHEEL
nn
UU
ANN
\\
\\\\
~~
PINCH ROLLER
DRIVE LEVER
\
PINCH ROLLER
DRIVE SLIDE
The main cam wheel’s groove (A) rived the pinch
roller drive lever, pinch roller drive slide and the
pinch roller.
2) Head base plate (Refer to Fig. 5-2)
GROOVE
\\\
TA,
HEAD DRIVE
LEVER FULCRUM
The main cam wheel’s groove (8) drives the head
drive lever and the head base plate. When the head
SERVICE MANUAL
Fig. 5-1
When the pinch roller drive lever moves in the right
direction, the reverse side’s pinch roller moves to the
left direction and the capstan contacts to the forward
side’s pinch roller.
MAIN CAM WHEEL
Fig. 5-2
base plate moves vertically, the REC/PB combination
head moves vertically.