Text preview for : Yamaha-TX396L tun.pdf part of Yamaha TX396L tuner



Back to : Yamaha-TX396L tun.part1.r | Home

TX-396L




AM/FM STEREO TUNER

TX-396L SERVICE MANUAL




IMPORTANT NOTICE
This manual has been provided for the use of authorized YAMAHA The data provided is believed to be accurate and applicable to the unit(s)
Retailers and their service personnel. indicated on the cover. The research, engineering, and service departments
It has been assumed that basic service procedures inherent to the industry, of YAMAHA are continually striving to improve YAMAHA products.
and more specifically YAMAHA Products, are already known and Modifications are, therefore, inevitable and specifications are subject to
understood by the users, and have therefore not been restated. change without notice or obligation to retrofit. Should any discrepancy
WARNING: Failure to follow appropriate service and safety appear to exist, please contact the distributor's Service Division.
procedures when servicing this product may result in WARNING: Static discharges can destroy expensive components.
personal injury, destruction of expensive components, Discharge any static electricity your body may have
and failure of the product to perform as specified. For accumulated by grounding yourself to the ground buss in
these reasons, we advise all YAMAHA product owners the unit (heavy gauge black wires connect to this buss).
that any service required should be performed by an IMPORTANT: Turn the unit OFF during disassembly and part
authorized YAMAHA Retailer or the appointed service replacement. Recheck all work before you apply power
representative. to the unit.
IMPORTANT: The presentation or sale of this manual to any individual
or firm does not constitute authorization, certification or
recognition of any applicable technical capabilities, or
establish a principle-agent relationship of any form.




I CONTENTS
TO SERVICE PERSONNEL .......................................... 1 µCOM DATA .................................................................. 8
SPECIFICATIONS .......................................................... 1 DISPLAY DATA ............................................................. 9
INTERNAL VIEW ........................................................... 2 BLOCK DIAGRAM ................................................. 10~11
REAR PANELS .............................................................. 2 PRINTED CIRCUIT BOARD .................................. 12~13
DISASSEMBLY PROCEDURES ................................... 2 SCHEMATIC DIAGRAM ........................................ 14~15
ADJUSTMENTS ......................................................... 3~7 PARTS LIST ........................................................... 16~21
TX-396L




100700
P.O.Box 1, Hamamatsu, Japan
TX-396L




AC LEAKAGE
I TO SERVICE PERSONNEL WALL EQUIPMENT TESTER OR
Critical Components Information. OUTLET UNDER TEST EQUIVALENT
Components having special characteristics are marked
and must be replaced with parts having specifications
equal to those originally installed.

INSULATING
TABLE


WARNING: CHEMICAL CONTENT NOTICE!
The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and /or plastic
(where applicable) components may also contain traces of chemicals found by the California Health and Welfare Agency
(and possibly other entities) to cause cancer and/or birth defects or other reproductive harm.

DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REA-
SON WHATSOEVER!

Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or expose
eyes to solder/flux vapor!

If you come in contact with solder or components located inside the enclosure of this product, wash your hands before
handling food.




I SPECIFICATIONS

I FM SECTION I AUDIO SECTION
Tuning Range 87.50 to 108.00 MHz Output Level/Impedance (Fixed)
50dB Quieting Sensitivity (IHF) FM 100 % MOD 1 kHz 500 mV/2.2 k
Mono 1.55 µV(15.1 dBf) MW/LW 30 % MOD 1 kHz 200 mV/2.2 k
Stereo (1 kHz 100% MOD) 21 µV(37.7 dBf) I GENERAL
Usable Sensitivity (DIN) Power Supply AC230V, 50Hz
Mono (S/N 26 dB) 0.9 µV Power Consumption 7W
Stereo (S/N 46 dB) 24 µV Dimensions (W x H x D) 435 x 86 x 278mm
Alternate Channel Selectivity Weight 3.2 kg
Selectivity (two signals) 40 kHz Dev. ±300 kHz 70 dB
* Specifications subject to change without notice.
Signal to Noise Ratio (DIN-Weighted 40 kHz)
Mono 75 dB
· MODEL COLOR
Stereo 70 dB
Black and Gold
Harmonic Distortion 1 kHz
Mono 0.1 %
Stereo 0.2 %
Stereo Separetion 1kHz (40 kHz Dev.) 50 dB · DIMENSIONS
11.3




Frequency Response
20 Hz to 15 kHz 0±0.5 dB
I MW SECTION
Tuning Range 531 to 1611 kHz
Usable Sensitivity 200 µV/m
263.5
278




Signal to Noise Ratio 50 dB
Harmonic Distortion 1 kHz 0.3 %
I LW SECTION
Tuning Range 153 to 288 kHz
Usable Sensitivity 400 µV/m
3.2




Signal to Noise Ratio 50 dB
Harmonic Distortion 1 kHz 0.3 %
70
86




435
16




1
TX-396L




I INTERNAL VIEW
1 2

1 Tuner P. C. B (1)
2 Front-end pack
3 Operation P. C. B. (2)
4 Tuner P. C. B. (2)
5 Operation P. C. B. (1)
6 Operation P. C. B. (3)




3 4 5 6


I REAR PANEL




I DISASSEMBLY PROCEDURES
(Remove parts in the order as numbered.)
1. Removal of Top Cover
Remove 4 screws (1) and 2 screws (2) in Fig. 1.

2. Removal of Front Panel
a. Disconnect the connectors (CB3 anf CB4) in Fig. 1.
b. Remove 2 plastic rivets (3) in Fig. 1.
c. Remove 5 screws (4) in Fig. 1.
d. Unhook at 2 place (5) in Fig. 1.




2
TX-396L




I ADJUSTMENTS
1. Before Adjustment (1)All the segments on the display light up.
(1)With the power turned on, wait for 5 minutes before (2)The model name, TX-396L is displayed.
starting adjustment so that operation becomes stable. (3)The place of destination is displayed.
(2)Adjust the OSC coil and IFT with insulated screwdriver. (4)The µCOM-version is displayed.
(3)Set the TUNING MODE to AUTO.
(4)Decibel abbreviations Pressing the P1 key will cause operation to start from (1).
dBµ : Decibels above or below 1µV Pressing any other key will cause the mode to return to the
Example : NORMAL mode.
0dBµ = 1 µv, 60dBµ = 1 mV
X dBµ = (X + 11.2) dBf
When substituting 60 for X, Preset P1 P2 P3 P4 P5 P6 P7 P8
60 dBµ = 72.2 dBf
A, E 87.50 90.10 95.10 98.10 108.00 88.10 106.10 108.00

2. Measuring instrument abbreviations B, D 630 1080 1440 531 1611 900 1350 1404
FM SG : FM signal generator C 153 171 225 270 288 180 207 252
SSG : Stereo signal generator
AM SG : AM signal generator
DIST. M : Distortion meter 1) Discriminator balance adjustment
FC : Frequency counter
ACVM : AC voltage meter FM TP1
ANT
DCVM : DC voltage meter FM FM Tuner




R51
dummy GND DCVM
SG antenna P. C. B.

TP2
Check that the voltage obtained across each test point
oscillator
and ground on the tuner circuit is as follows.

Test points Rating or Standard 2) Monaural distortion adjustment
+5 V terminal +5.6 ±0.5 V FM L
ANT
-VP terminal -23.0 ±1.0 V FM R
Oscilloscope
FM Tuner
dummy GND
SG antenna P. C. B. OUT
CAUTION : PUT ACVM
Before setting to the TEST mode, write down the user
preset memory content in the table as shown below. (This oscillator DIST. M
is because setting to the TEST mode will cause the
memory content to be the factory preset memory content, 3) Stereo distortion adjustment
i.e. all the user preset memory content will be erased.)
FM L
ANT Oscilloscope
FM FM Tuner R
Preset keys P1 P2 P3 P4 P5 P6 P7 P8 dummy GND
SG antenna P. C. B. OUT YLF-15
A PUT (LPF) ACVM

B
SSG DIST. M
C
D 4) Sensitivity verification
E
FM L
ANT Oscilloscope
FM FM Tuner R
dummy
SG GND P. C. B. OUT
· Turn on the POWER switch while pressing the A/B/C/D/ antenna
PUT ACVM
E and FM/AM(FM/MW/LW) keys simultaneously, and
the unit enters the TEST mode for the display check. DIST. M
After this, repeat (1) to (4).




3
TX-396L



G TEST POINTS





Reception Adjusted
Step Adjustment item Signal (ANT IN) Test point Rating
frequency point

Rough adjustment of FM SG: Preset L8 TP1, TP2 DC 0 V ±100mV
discriminator balance. 98.1 MHz 70 dBµ A-4: 98.1 MHz (right side) (both end at tuning point.
1
Modulation : 100 % of R51)
Monaural : 1 kHz

Rough adjustment of Same as Step 1. Same as Step 1. L8 OUTPUT Minimize distortion.
2
monaural distortion. (left side)

Fine adjustment of Same as Step 1. Same as Step 1. L8 TP1, TP2 DC 0 V ±50mV
3
discriminator balance. (right side)

Fine adjustment of Same as Step 1. Same as Step 1. L8 OUTPUT Minimize distortion.
4
monaural distortion. (left side) (to less than 0.7%)

Verification of Same as Step 1. Same as Step 1. TP1, TP2 DC 0 V ±50mV
5
discriminator balance.

Adjustment of frontend FM SG: Same as Step 1. Frontend TP3, GND Adjust so that the
IFT. 98.1 MHz 30 dBµ IFT DC voltage is
Modulation : 100 % maximum.
Monaural : 1 kHz CAUTION:
6 If IFT core is turned
excessively, the
sensitivity reduces.
(Maximum ±90°)

Adjustment of stereo FM SG: Same as Step 1. VR1, VR2 OUTPUT Minimize distortion.
distortion. 98.1 MHz 70 dBµ Tuning mode is
7
Modulation : 100 % AUTO.
Stereo L or R : 1 kHz

4
TX-396L




Reception Adjusted
Step Adjustment item Signal (ANT IN) Test point Rating
frequency point

Verification of monaural FM SG: Same as Step 1. OUTPUT Minimize distortion.
distortion. 98.1 MHz 70 dBµ (to less than 0.7%)
8
Modulation : 100 %
Monaural : 1 kHz

Verification of stereo FM SG: Same as Step 1. OUTPUT Minimize distortion.
distortion. 98.1 MHz 70 dBµ (to less than 1.4%)
9
Modulation : 100 % Tuning mode is
Stereo L or R : 1 kHz AUTO.

Verification of FM SG: A-6: 88.1 MHz S/N should be 30 dB
sensitivity. 88.1/98.1/106.1 MHz A-4: 98.1 MHz at each frequency of
Modulation : 100 % A-7: 106.1 MHz 88.1 MHz, 98.1 MHz
10 Monaural : 1 kHz and 106.1 MHz.
Make sure that the
voltage at the ANT
terminal is 7 dBµ or
less.

Adjustment of FM SG: Preset VR4 OUTPUT To more than 35 dB.
11 separation. 98.1 MHz 70 dBµ A-4: 98.1 MHz Tuning mode is
Modulation : 100 % AUTO.
Stereo L or R : 1 kHz

Adjustment of the signal FM SG: Preset VR3 Signal Adjust so that the
meter. 98.1 MHz 45 dBµ A-4: 98.1 MHz meter signal meter is
12
Modulation : 30 % maximum at rating
Monaural : 1 kHz level.

Verification of the signal ANT input minimum. Make sure that the
13 meter to turn off. signal meter is
turned off.

Verification of AUTO FM SG: Preset Tuning Automatic reception
TUNING. 98.1 MHz 23 dBµ A-4: 98.1 MHz buttons should be available
Modulation : 30 % when the tuning UP
Stereo L or R : 1 kHz or DOWN key is
pressed.
14
Stereo indicator is
turned on.
Audio muting should
be applied during
tuning.




5
TX-396L



AM loop antenna

· To be adjusted after FM section adjustment.
· Use the specified dummy anetenna for loop antenna.



AM dummy antenna

AM ANT

AM
SG
GND



Reception Adjusted
Step Adjustment item Signal (ANT IN) Test point Rating
frequency point

Adjustment of AM SG: Preset L5 OUTPUT Maximize detected
sensitivity. 630 kHz 50 dBµ, B-1: 630 kHz signal output.
1
1 kHz,
30% modulation

Verification of AM SG: Preset To be less than 54
sensitivity. 630 kHz/1080 kHz/ B-1: 630 kHz dBµ.
2 1440 kHz 50 dBµ, B-2: 1080 kHz
1 kHz, B-3: 1440 kHz
30% modulation

Verification of the signal AM SG: Preset Make sure that the
meter. 1080 kHz 90 dBµ, B-2: 1080 kHz signal meter is
ANT input 90 dBµ turned on.
3
ANT input -10 dBµ or Make sure that the
less signal meter is
turned off.

Verification of auto AM SG: Preset Tuning Automatic reception
tuning. 1080 kHz 60 dBµ, B-2: 1080 kHz button should be available
1 kHz, when the tuning UP
30% modulation or DOWN key is
4
pressed.
Audio muting should
be applied during
tuning.




6
TX-396L



AM loop antenna
· To be adjusted after MW section adjustment.
· Use the specified dummy anetenna for loop antenna.




AM dummy antenna

AM ANT

AM
SG
GND




Reception Adjusted
Step Adjustment item Signal (ANT IN) Test point Rating
frequency point

Verification of AM SG: Preset OUTPUT To be less than 66
sensitivity. 171 kHz/225 kHz/270 C-2: 171 kHz dBµ.
1
kHz 90 dBµ, C-3: 225 kHz
1 kHz, C-4: 270 kHz
30% modulation

Verification of the signal AM SG: Preset Make sure that the
meter. 225 kHz 90 dBµ, B-2: 225 kHz signal meter is
ANT input 90 dBµ turned on.
2
ANT input -10 dBµ or Make sure that the
less signal meter is
turned off.

Verification of auto AM SG: Preset Tuning Automatic reception
tuning. 225 kHz 60 dBµ, B-2: 225 kHz button should be available
1 kHz, when the tuning UP
3 30% modulation or DOWN key is
pressed.
Audio muting should
be applied during
tuning.




7
TX-396L




I µ-COM DATA

IC501 : LC866420A
8 bit µ-COM




No. Port I/O Name Function No. Port I/O Name Function
1 P17/PWM0 O /MMUTE Main mute 41 VDD2 I VDD +5V
2 P30 I ROT1 Rotary encoder input 42 VP I VDDVPP ­24V
3 P31 I ROT0 This input available for ROTSW=H 43 S16/PC0 O P1 FL segment
4 P32 I MODEL Model 0 44 S17/PC1 O P2 FL segment
5 P33 I ROTSW Rotary encoder yes(H) or no(L) 45 S18/PC2 O P3 FL segment
6 P70/INT0 I -- -- 46 S19/PC3 O P4 FL segment
7 /RES I /RESET Reset 47 S20/PC4 O P5 FL segment
8 /P74/XT1 I -- -- 48 S21/PC5 O P6 FL segment
9 P75/XT2 I -- -- 49 S22/PC6 O P7 FL segment
10 VSS1 I GND GND 50 S23/PC7 O P8 FL segment
11 CF1 CF 6MHz 51 S24/PD0 O P9 FL segment
12 CF2 CF 6MHz 52 S25/PD1 O P10 FL segment
13 VDD1 I VDD +5V 53 S26/PD2 O P11 FL segment
14 P80/AN0 ADI KEYIN1 AD key input 54 S27/PD3 O P12 FL segment
15 P81/AN1 ADI KEYIN2 AD key input 55 S28/PD4 O P13 FL segment
16 P82/AN3 ADI KEYIN3 AD key input 56 S29/PD5 O P14 FL segment
17 P83/AN3 ADI METER Signal level input 57 S30/PD6 O P15 FL segment
18 P84/AN4 I -- -- 58 S31/PD7 O -- --
19 P85/AN5 I -- -- 59 S32/PE0 I/O -- --
20 P86/AN6 I -- -- 60 S33/PE1 I/O -- --
21 P87/AN7 ADI VER Version input 61 S34/PE2 I/O -- --
22 P71/INT1 I -- -- 62 S35/PE3 I/O -- --
23 P72/INT2 I /POWERDOWN Power down detect 63 S36/PE4 I/O -- --
24 P73/INT3 I REM REM input 64 S37/PE5 I/O -- --
25 S0/T0 O 13G FL segment 65 P00 O -- --
26 S1/T1 O 12G FL segment 66 P01 O -- --
27 S2/T2 O 11G FL segment 67 P02 O -- --
28 S3/T3 O 10G FL segment 68 P03 O -- --
29 S4/T4 O 9G FL segment 69 P04 O /TMUTE Tuner mute
30 S5/T5 O 8G FL segment 70 P05 O -- --
31 S6/T6 O 7G FL segment 71 P06 O -- --
32 S7/T7 O 6G FL segment 72 P07 O -- --
33 S8/T8 O 5G FL segment 73 VSS2 I GND GND
34 S9/T9 O 4G FL segment 74 P10/S00 O -- --
35 S10/T10 O 3G FL segment 75 P11/SI0 SIN -- --
36 S11/T11 O 2G FL segment 76 P12/SCK0 SCL -- --
37 S12/T12 O 1G FL segment 77 P13/SO1 I PLLDAT-in Data input from PLL
38 S13/T13 -- -- 78 P14/SI1 O PLLDAT-out Data output for PLL
39 S14/T14 -- -- 79 P15/SCK1 O PLL-CLK PLL clock
40 S15/T15 -- -- 80 P16/BUZ O PLLCE PLLCE


KEY INPUT
Key Input 1 2 3 4 5 6 7
Resistance () 0k 1.8k 2.7k 3.9k 6.8k 13k 39k
Extent of AD 00H~15H 16H~3DH 3EH~64H 65H~8AH 8BH~B0H B1H~D3H D4H~F0H
Extent of Voltage (V) 0.00~0.41 0.41~1.19 1.19~1.95 1.95~2.70 2.70~3.44 3.44~4.12 4.12~4.69
Pin No.14 KEYIN1 P3 P4 P5 P6 P7 P8 --
Pin No.15 KEYIN2 MODE EDIT (KMODE) MEMORY PAGE P1 P2 --
Pin No.16 KEYIN3 -- -- -- -- FM/AM (MW/LW) TUNING DOWN TUNING UP

8
TX-396L




I DISPLAY DATA (13-BT-152GK)




PIN CONNECTION
PIN NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

CONNECTION F1 F1 NP P15 P14 P13 P12 P11 P10 P9 P8 P7 P6 P5 P4 P3 P2 P1


PIN NO. 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35

CONNECTION NC 1G 2G 3G 4G 5G 6G 7G 8G 9G 10G 11G 12G 13G NP F2 F2

NOTE:
1) F1, F2 ................. Filament
2) NP ....................... No pin
3) NC ....................... No connection
4) DL ....................... Datum line
5) 1G~13G .............. Grid


ANODE CONNECTION

13G 12G 11G 10G 9G 8G 7G 6G 5G 4G 3G 2G 1G
P1 a a a a a a a a a a a
P2 b b b b b b b b b b b
P3 c c c c c c c c c c c
P4 d d d d d d d d d d d
P5 e e e e e e e e e e e
P6 f f f f f f f f f f f
P7 g g g g g g g g g g g
P8 h h h h h h h h h h h
P9 j j j j j j j j j j j
P10 k k k k k k k k k k k
P11 m m m m m m m m m m m
P12 n n n n n n n n n n n
P13 p p p p p p p p p p p
P14 r r r r r r r r r r r
P15 t t t t t t t t t t t

9
A B C D E F G H I J
TX-396L


1
I BLOCK DIAGRAM



L7
FM DET MPX IC
AM/FM IF IC COIL
FM FRONT END PK1 IC3 : LA3401 LPF
IC2 : LA1266 6 7 L12
RF AMP
2 MIXER L2 Q2, 5 L3 Q3, 4 Q10 L4 Q13 FM IF AMP Q16 L10 5
L ch
1 7 1 B 2 MUTE
FM/AM SW
FM 75 MUTING DECODER
QUADRATURE 8 Q19,20
GND VR1, 2
DET
1 Q22,23 R ch
LEVEL DET
AM DE-EMPHASIS L13
OSC K
0 IF
PLL
BUFFER
BUFFER G
C CONTROL
XL3
5 8
A IF
BUFFER ST IND. MUTE
L9
CERAMIC
Q15 FILTER
C
3 H AM
L5
DET

AM COIL PACK PK2
J
RF AMP MIXER
ANT
K
AGC
COIL


OSC M LED
OSC S. METER
COIL DRIVER

N F 8

PLL IC1 : LC72130
10 -COM
4
1 REFERENCE PHASE DETECTOR 19
DIVIDER CHARGE PUMP
24 20
CMOS G
18
1/2 SWALLOW COUNTER UNLOCK
15 1/16, 1/17 4bits DETECTOR 17 TUNING
CONTROL


21 Q502
7 LSI
14 12bits PROGRAMMABLE
DIVIDER 22
RESET 1
IC501
3
LC866420A
5 4 C2B DATA SHIFT REGISTER LATCH UNIVERSAL
12 Q501 M V501
I/F COUNTER POWER
5 ON 8 bit CPU
6 O~[
16 POWER c~q
ON
RESET 2
*B Ca
23
7 8 9 11 13 C502
BACKUP
CONTROL & DATA BUS
D~F N
12 XY


SW520
POWER SW
6 KEY BOARD
D502
VP
SW501 ~ 519 REMOTE *B
U501 CONTROL POWER
RECEPTER 12V SUPPLY
5V




7


10 11
A B C D E F G H I J
TX-396L


1
I PRINTED CIRCUIT BOARD (Foil side)
FM ANT GND AM ANT
TUNER P.C.B. (1) LINE OUT
DISCRIMINATOR MONAURAL SEPARATION R L
BALANCE DISTORTION TUNER P.C.B. (2)



2


TP1
1 12


TP2
24 13




To TUNER P.C.B.(2)
1 11


3
SIGNAL 22 12 OPE P.C.B. (2)




From TUNER P.C.B.(2)
METER
To TUNER P.C.B.(2)
AM SENSITIVITY




AC1*
AC1

FL1
FL2

DG
VP
To OPE P.C.B.(1)


FL1
FL2

DG
VP
12 13