Super Star 4900B User manual

Super Star 4900B Service Manual
This is a on going project to document the Superstar 4900B. I started working on this manual Dec 2000. You can display
and print it but publication on the web and commercial use are not allowed.
If you have test equipment and a 4900B or can help in technical writing and/or research and would like to help on this
project go to the CBTricks Message Board and look for the Superstar documentation Discussion Group.
This manual is by no way complete.
Rev. History
Rev. # 1.0
(a) Put up on the site
Rev. # 1.1
(a) Worked on the Alignment hook-up diagrams.
(b) Put the parts lists with the board layouts
(c) Made a change to alignment layout
(d) Put a picture of the radio on first page.
(e) Schematic of the ASC PCB.
Rev. #1.2
(a) Schematic of MIC PCB
(b) Board Layouts MIC PCB
(c) AMC Mod Information
Next I need to work on the following sections.
Alignment Procedure
Export Frequency Modification
Parts List
Circuit descriptions
Semiconductor Information
Index page and index all the pages
www.CBTricks.com

SPECIFICATIONS
GENERAL
FREQUENCY COVERAGE 28.000 TO 29.690 MHz (10 METER BAND)
23.000 TO 29.600MHz (10 METER EXPENDED.)
26.965 TO 27.405MHz (CITIZEN BAND)
23.815 TO 30.555MHZ (600CHANEL CB BAND)
FREQUENCY GENERATION BY MEANS OF PLL SYNTHESIZER
FREQUENCY STABILITY ±0.001%
OPERATING TEMPERATURE -10C TO +55C
POWER SOURCE REQUIREMENTS AC 120V/5OHz or DC 16V
ANTENNA IMPEDANCE 50 ohm Unbalanced
MIC IMPEDANCE 2000 OHM
RECEIVER SECTION
CIRCUIT TYPE DUAL CONVERSION SUPERHETERODYNE
IF FREQUENCY 1st IF: 10.695MHz, 2’nd IF : 455KHz
SENSITIVITY FM: 0.5uV FOR 20dB SINAD, With CCITT FILTER
AM: 0.7uV FOR 10dB NQ
SSB:0.15uV FOR 10dB NQ
SPURIOUS & IMAGE REJECTION 60dB Mm.
INTER MODULATION DISTORTION 54dB Mm.
S/N RATIO 40dB
AUDIO OUTPUT @I0%THD 2.0 W
TRANSMITTER SECTION
POWER OUTPUT SSB (A3J): 20Watts PEP input
AM (A3E): 15Watts
FM (F3E): I5Watts
MODULATION FM : 2KHZ, AM : 85%
HARMONIC OUTPUT More than 40 dB below peak power output
S/N RATIO 40dB

Semiconductors And Function
IC COMPLEMENT
FUNCTION REF.NO TYPE MANUFACTURER
MIC AMP IC-4 KIA4558F KEC
RESET IC-13 KIA7045F KEC
SQ COMPARATOR IC-2 NJM324 (M) JRC
DTMF DECODER IC-5 KS58015 SAM SUNG
DTMF ENCODER IC-6 KT3170 SAM SUNG
BALANCE MODULATOR IC-12 TDA6130-5 SGS
IF DEMODULATOR IC-1 MC3361 MOTOROLA
ASC COMPARATOR IC-1 ASC BD KIA324F (SMD) KEC
CPU IC-7 TMP87CM21DF TOSHIBA
PLL IC-9 LC7152M SANYO
LCD DRIVER IC-401 LC75854W SANYO
10V REGULATOR IC-14 KIA7810 (TO-220) KEC
BALANCE MIXER IC-3 UPC1037AH SGS
EEPROM IC-8 X24C02F PRO-CHIPS
5V REGULATOR IC-10 78L05 SOT-89 KEC
AUDIO POWER AMP IC-11 KIA7217AP KEC
Transistor & Diode Complement
FUNCTION REF.NO TYPE MANUFACTURER
CLARIFIER B+ SW Q404 KRA102S KEC
B+ SW FOR USA & LSB Q403 KRC102S KEC
SW FOR ANT 1 LED Q406 KRC112S KEC
SW FOR ANT 2 LED Q405 KRC112S KEC
SW FOR LCD BACKLIGHT Q401 KTC200, TO-92 KEC
SW FOR LCD BACKLIGHT Q402 KTC200, TO-92 KEC
FINAL PA Q73 25C1969 (CH) MITSUBISHI
FINAL PA Q74 25C1969 (CH) MITSUBISHI
DRIVER Q72 25C2166 MITSUBISHI
AVR SWITCH Q65 KTA1940 KEC
NB B+ SWITCHING Q1 KRA104 KEC
NB B+ SWITCHING Q2 KRC110S KEC
NB SIGNAL MUTE Q7 KRC110S KEC
NB NOISE AMP Q5 KRC112S KEC
NB B+ DRIVER Q6 KTA1504 KEC
AMC DRIVER Q43 KTA1504S KEC
FM LIMITTER B+ SWITCH Q50 KRA102S KEC
RX DET LEVEL SWITCH Q29 KRC110S KEC
SSB MOD MUTE Q41A KRC110S KEC
AM MOD MUTE Q59 KRC110S KEC
AUDIO MUTE Q62 KRC110S KEC
RX MUTE Q18 KTC3880S KEC
RX 1st AMP Q19 KTC3880S KEC
RX I'ST MIXER Q22 KTC3880S KEC
RX AMP Q23 KTC3880S KEC
10.2417 OSC Q32 KTC3880S KEC
FIN BUFFER Q36 KTC3880S KEC
VCO OSC Q37 KTC3880S KEC
VCO BUFFER Q38 KTC3880S KEC
2nd MIXER OSC Q53 KTC3880S KEC
SQ IN Q14 KRC102S KEC
FM B+ SW FOR MIC AMP 039 KRC102S KEC
SWITCH FOR HI-CUT Q45 KRC102S KEC
SWITCH FOR HI-CUT Q46 KRC102S KEC
SWITCH FOR HI-CUT Q47 KRC102S KEC
SWITCH FOR HI-CUT Q48 KRC102S KEC
SWITCH FOR METER Q60 KRC102S KEC
SSB AGC CONTROL Q16 KRC102S KEC
AMC DRIVER Q44 KTC3875S KEC
AM ALC DRIVER Q64 KTC3875S KEC
AM / FM POWER DRIVER Q68 KTC3875S KEC

AUDIO PRE AMP Q17 KTC3875S KEC
AUDIO PRE AMP Q63 KTC3875S KEC
RF GAIN DRIVER Q21 KRC112S KEC
SWITCH FORANL Q31 KRC112S KEC
RX / TX SWITCH Q57 KRC112S KEC
SWR SWITCH Q603 KRC112S KEC
NB AMP Q3 KTC3878 KEC
NB AMP Q4 KTC3878 KEC
TX IF AMP Q24 KTC3878 KEC
IF AMP Q25 KTC3878 KEC
IF AMP Q26 KTC3878 KEC
IF AMP Q27 KTC3878 KEC
IF AMP Q28 KTC3878 KEC
SSB POWER SW Q42 KTC3878 KEC
TX PRE DRIVER Q75 KTC3879 KEC
TX BUFFER AMP Q69 KTC3879 KEC
RX / TX SWITCHING Q611 KRC107 KEC
SWR SWITCHING Q602 2SJ144 TOSHIBA
CAL SWITCHING Q604 2SJ144 TOSHIBA
MOD METER SWITCHING Q607 2SJ144 TOSHIBA
RX B+ SWITCH Q55 KTC200 KEC
SSB B+ SWITCH Q67 KTC200 KEC
TX B+ SWITCH Q58 KTA200 KEC
MAIN B+ SWITCH Q66 KTA200 KEC
9V REG B+ SWITCH Q61 KTC3205 KEC
PRE DRIVER Q71 2SC2314 SANYO
BIAS D75 1N4001 KEC
BIAS D74 1N4001 KEC
NB DC DETECT D1 1N60 KEC
NB DC DETECT D2 1N60 KEC
CAL / SWR METER DETECT D77 1N60 KEC
RX SIGNAL METER DET. D7 1N60 KEC
RX AM / SSB DET. D23 1N60 KEC
RX AM / SSB DET. D24 1N60 KEC
RX SIGNAL METER DET. D83 1N60 KEC
CAL / SWR METER DET. D101 1N60 KEC
RELAY RECTIFIER D78A 1N4148 KEC
9.1V REG ZENER D103 UZ9.1B KEC
ANT 1 ON LED D411 DKL30RD EVER GREEN
ANT 2 ON LED D412 DKL30RD EVER GREEN
RX / TX INDICATOR LED D407 209EGW/S209 EVER GREEN
BRIDGE RECTIFIER BD1 KBPC606 PYUNG CHANG
RX EXPENDER D13 KDV251S KEC
RX EXPENDER D14 KDV251S KEC
VARICAP FOR CLR D28 KDV251S KEC
VCO EXPENDER D29 KDV251S KEC
VCO EXPENDER D31 KDV251S KEC
TX EXPENDER D68 KDV251S KEC
TX EXPENDER D69 KDV251S KEC
TX EXPENDER D71 KDV251S KEC
RX EXPENDER D30 KDV251S KEC
Manufacturers.
KEC : KOREA ELECTRONICS CO., LTD.
JRC JAPAN RADIO COMPANY.
SANYO TOKYO SANYO ELECTRNIC CO., LTD.
TOKO JAPAN TOKO ELECTRNIC CO.,LTD
PYUNG CHANG: PYUNG CHANG CO.,LTD
EVER GREEN: HONG KONG EVER GREEN CO.,LTD

SS4900 Block Diagram

SS4900 Adjustment Locations

Test Equipment Required
1) CPU and Phase Locked Loop Section
1 Frequency Counter
2 DC Power Supply
3 DC Volt Meter
4 Oscilloscope
2) Transmitter Section
1 RF Power Meter (RF SSVM)
2 50ΩLoad (non-inductive)
3 RF Attenuator
4 Oscilloscope
5 Audio Generator
6 DC Power Supply
7 Spectrum Analyzer
8 Frequency Counter
9 Coupler
3) Receiver Section
1 RF Signal Generator
2 RF Power Meter
3 Distortion Meter
4 DC Power Supply
Alignment Procedure
1) Phase Looked Loop And CPU Section
STEP SETTING CONNECTION ADJUST ADJUST FOR
1 Frequency Adjustment;
Mode: Receive
Volume: Optional
Squelch : Optional
CH Selector: 1
FM
ANT1
Frequency counter to output
pin 3, 4 of IC-7.
(Figure-1)
4MHZ ± 100Hz
2 CPU Voltage Check; Mode:
Receive
Volume: Optional
Squelch : Optional
CH Selector: Optional
FM
ANT1
Connect DC volt. meter to PIN
3 of IC-10.
(Figure-2)
Indication on DC
voltmeter must be
5.0 - 6volt.

2) Transmitter Section
STEP SETTING CONNECTION ADJUST ADJUST FOR
1 RF Driver Stage;
Mode : Transmit
Volume: Optional
Squelch : Optional
CH Selector:19
AM
ANT1
Without modulation
Connect oscilloscope probe to
base of Q72
(Figure-3)
T216
T217
T218
T219
T220
Adjust for Maximum
waveform on the
oscilloscope.
2 RF Power Stage; ANT1
Mode : Transmit
ANT 1 selected
Volume: Optional
Squelch : Optional
CH Selector:19
AM
Without modulation
Connect dummy load and RF
power meter to the external
ANT1 Jack on the set
(Figure-4)
L21
Power
volume
max.
Adjust for max.
Indication on the power
meter.
3 RF Power Stage; ANT2
Mode : Transmit
ANT 2 selected
Volume: Optional
Squelch : Optional
CH Selector:19
AM
Without modulation
Connect dummy load and RF
power meter to the external
ANT2 Jack on the set
(Figure-4)
Check for the same
output as in step 2
4 Second harmonic Check;
Mode: Transmit
ANT 1 selected
Volume: Optional
Squelch : Optional
CH Selector: 19
AM
Without modulation
Connect RF power meter with
dummy load to spectrum
analyzer through coupler/-40dB
atten. to EXT-ANT 1 Jack on
the set
(Figure-5).
At no modulation,
Compare the level of
fundamental freq-
spectrum to the level of
harmonic freq-
spectrum. Suppression
of the 2nd harmonic
Freq. level must be
lower than -60dB.
Check for the other
channel’s
5 Frequency Check;
Mode : Transmit
ANT 1 selected
Volume: Optional
Squelch : Optional
CH Selector: 19
FM
ANT1
Connect dummy load and
frequency counter through
coupler to RF power meter.
Also connect power meter to
ANT1 jack on the set.
(Figure-6)
RV3
T214
Make sure that the
Indication of the
Transmitter freq. Is
27.965 [Mhz] ±300Hz
on the frequency
counter.
6 MAX Deviation Check;
Mode : Transmit
ANT 1 selected
Volume: Optional
Squelch : Optional
CH Selector: 19
ANT1
Change: FM OR AM
Connect dummy load and
modulation meter through
coupler to RF power meter.
Also connect power meter to
EXT-ANT 1 Jack on the set.
(Figure-7)
VR401
RV7
RV5
VR850
Adjust RV7so that the
indication of the
modulation analyzer is
90% with ±5% tolerance
at high power mode.
Adjust RV5 so that the
indication of the
deviation analyzer is
2.0KHz ±0.2KHz
tolerance at high power
mode

3) Receiver Section
STEP SETTING CONNECTION ADJUST ADJUST FOR
1 RX Sensitivity;
Mode: Receiver
Volume: Fully clockwise
Squelch:
Turn to counterclockwise
CH Selector:19
SSG :
27.185MHz,1KHz,
1uV(-107dBm)
(AM) 60% MOD
(FM) 1.2kHz 0EV
Connect RF signal generator to
external ANT. Jack. Connect
SSVM, Sinadder,
Oscilloscope and distortion
meter across EXT-Speaker out
jack with 8Ωdummy load
(Figure-8)
(FM)
T201
T202
T203
T204
T205
(AM)
T206
T207
T208
Adjust the parts of
tuning circuitry with
observing
ADM(Automatic
Distortion Meter)
indicates 20dB SINAD
in AM mode, and adjust
output level of RF-SSG
until speaker out level
reaches about 500
miliwatt (2.0Volt)
Adjust for Maximum
indication on SSVM
2 Squelch Adjustment;
Mode: Receiver
Volume: 500mW (2.0V)
Squelch : TIGHT
CH Selector:19
SSG:
27.185MHz, 1KHz
<Tight> 1 mV(-47dBm)
(AM) 60% MOD
(FM) 1.2kHz_DEV
Connect RF signal generator to
external ANT. Jack. Connect
RF power meter and distortion
meter Across EXT-Speaker out
jack with 8Ωdummy load
(Figure-8)
RV2 At each mode, Adjust
the point until the audio
output appeared on
oscilloscope.
3 Signal Meter Adjustment;
Mode: Receiver
Volume: 500mW (2.0V)
Squelch:
Turn to counterclockwise
CH Selector: 19
SSG : 27.185MHz, 1KHz,
1.2KHz DEV
100uV (-67dBm)
Connect RF signal generator to
external ANT. Jack. Connect
RF power meter and distortion
meter across EXT-Speaker out
jack with 8Ωdummy load
(Figure-8)
RV1 Adjust so that the 9th
LCD Bar display on the
LCD
4 ASC Adjustment;
Mode: Receiver
Volume: 500mW (2.0V)
Squelch:
Turn to counterclockwise
CH Selector:19
SSG : 27.185MHz, 1KHz,
1.2KHz DEV.
0.5 µV (-113dBm)
Connect RF signal generator to
external ANT. Jack.
Connect SSVM, Sinadder,
Oscilloscope and distortion
meter across EXT-Speaker out
jack with 8Ωdummy load
(Figure-8)
Inside on
the
ASC BD
At each mode, Adjust
the point until the audio
output appeared on
oscilloscope.

Figure 1
Figure 2
Figure 3

Figure 4
Figure 5
Figure 6

Figure 7
Figure 8

SS4900 AMC Limiter Modification
To open the AMC (Automatic Modulation Control) circuit,
locate Q43 (SMD) in grid location G1 on the main PCB.
Carefully unsolder and lift the center pin up from the PCB, or
remove the part entirely.
Export Frequency Modification

Microphone Wiring Information:
Original Microphone Wiring Diagram:
Pin # Description
(1) Mic Audio (White)
(2) Receive (Black)
(3) Transmit (Red)
(4) Ch Down/Ch Up (Blue)
(5) Ground (Shield)
(6) + 13.8 VDC (Green)
(See Note Below)
Warning:
When wiring alternative microphones to this unit, Do Not short pin 6 to any other pins on the connector or damage to the
unit may occur. Many service techs often short these pins to determine the mic wiring config. Shorting the 13.8VDC on pin
6 to other pins such as pin 4 may result in damage to the Microprocessor or Power Supply in the unit.
Astatic TUG9D104 Wiring:
Pin # Description
(1) White
(2) Black
(3) Red
(4) N/C
(5) Blue & Shield
(6) N/C
Yellow N/C
Cobra CA-72 Power Desk Mic Wiring:
Pin # Description
(1) Red
(2) Blue
(3) White
(4) N/C
(5) Black & Shield
(6) N/C
Sure 526T Base Mic Wiring:
Pin # Description
(1) White
(2) Black
(3) Red
(4) N/C
(5) Blue & Shield
(6) N/C
Yellow N/C

Semiconductor Lead Identification And Internal Diagrams IC’s
ASC PCB
IC-1
NJM324 M
Main PCB
IC-1
MC3361 (SMD)

Main PCB
IC-2
KIA324F
Main PCB
IC-4

Main PCB
IC-5
Main PCB
IC-6
KT3170
1 IN + Non inverting input of the op amp.
2 IN - Inverting input of the op amp.
3 GS Gain Select.
4 VREF Reference Voltage output
5 IIN Input inhibit
6 PDN Control input for the stand-by power down mode.
7, 8 OSC1 OSC2 Clock input/output.
9 GND Ground pin.
10 OE Output Enable input.
11 - 14 Q1 - Q4 Three state data output.
15 DSO Delayed Steering Output
16 ESO Early Steering Outputs
17 SI / GTO Steering Input/Guard Time Output
18 VDD Power Supply

Main PCB
IC-7
TMP87CM21DF
CPU Pin Assignment
NO. PIN NAME REMARK DESCRIPTION ACTIVE
1 VSS GROUND
2 XOUT 4.0MHz HIGH FREQUENCY CLOCK OUT
3 XIN 4.0MHz HIGH FREQUENCY CLOCK IN
4 RESET RESET INPUT HIGH
5 P22 (XOUT) OPEN DRAIN DIMMER OUT1
6 P21 (XTIN) OPEN DRAIN DIMMER OUT2
7 TEST FOXED TO LOW (GROUND)
8 P20 (INT5/STOP) OPEN DRAIN MODE IN (IN)
9 P40 (INT3/TC3) TRI STATE N.C
10 P41 (PWM/PDO) TRI STATE BEEP TONE OUT FOR
1750HZ(OUT)
11 P42 (SCK1) TRI STATE SQ OUT (OUT) HIGH: SQ ON
12 P43 (S11) TRI STATE ASC CONTROL (OUT) HIGH: ASC ON
13 P44 (S01) TRI STATE ANL CONTROL (OUT) ACTIVE “H”
14 P45 (SCK2) TRI STATE NB CONTROL (OUT) ACTIVE “H”
15 P46 (S12) TRI STATE MODE IN (IN)
16 P47 (S02) TRI STATE DTMF ENCODER ENABLE (OUT)
17 P10 (INT0) TRI STATE ROTARY CHANNEL UP (IN) ACTIVE “L”
18 P11 (INT1) TRI STATE ROTARY CHANNEL DN (IN) ACTIVE “L”
19 P12 (INT2/TC1) TRI STATE DTMF ENCODER ENABLE (OUT)

20 P13 (DVO) TRI STATE TX OUT (OUT) ACTIVE “H”
21 P14 (PPG) TRI STATE LC7152 DI (OUT)
22 P15 (TC2) TRI STATE LC162 CLK (OUT)
23 P16 TRI STATE LC7152 ENABLE (OUT)
24 P17 TRI STATE LC7152 LDA (OUT)
25 P30 OPEN DRAIN EEPROM DATA
26 P31 OPEN DRAIN EEPROM CLOCK
27 P32 OPEN DRAIN FREQUENCY SHIFT 0.5KHz (OUT) ACTIVE “H”
28 P33 OPEN DRAIN FREQUENCY SHIFT 1KHz (OUT) ACTIVE “H”
29 P34 OPEN DRAIN FREQUENCY SHIFT 2KHz (OUT) ACTIVE “H”
30 P50 (AIN0) TRI STATE MODULATION LEVEL IN (A/D) (IN)
31 P51 (AIN1) TRI STATE SIGNAL LEVEL IN (A/D) (IN) ACTIVE “H”
32 P52 (AIN2) TRI STATE SWR LEVEL IN (A/D) (IN)
33 P53 (AIN3) TRI STATE AC LEVEL IN (IN)
34 P54 (AIN4) TRI STATE N.C
35 P55 (AIN5) TRI STATE MIC (PTT, UP, DN) (A/D) (IN)
36 P56 (AIN6) TRI STATE MIC (MON,P1, P2, P3) (IN) TABLE
37 P57 (AIN7) TRI STATE EMG SELECTOR (IN) “H”: EMG 19
“L”: EMG 9
38 VASS ANALOG INPUT MODEL SELECTOR 3 IN (IN)
39 VAREF ANALOG INPUT AD REFERENCE HIGH VILTAGE
40 VDD ANALOG INPUT VDD
41 P70 (SEG31) OPEN DRAIN LC7584 DATA OUT (OUT)
42 P71 (SEG30) OPEN DRAIN LC7584 DATA IN (OUT)
43 P72 (SEG29) OPEN DRAIN LC7584 CLOCK (OUT)
44 P73 (SEG28) OPEN DRAIN LC7584 CHIP ENABLE (OUT)
45 P74 (SEG27) OPEN DRAIN MODE IN TABLE
46 P75 (SEG26) OPEN DRAIN MODE IN TABLE
47 P76 (SEG25) OPEN DRAIN MODE IN TABLE
48 P77 (SEG24) OPEN DRAIN MODE IN TABLE
49 SEG23 (P60) DTMF IN/OUT
50 SEG22 (P61) DTMF IN/OUT
51 SEG21 (P62) DTMF IN/OUT
52 SEG20 (P63) DTMF IN/OUT
53 SEG19 (P64) ANT SELECTOR (OUT) “L” ANT 1
“H” ANT2
54 SEG18 (P65) MOD OUT (OUT) ACTIVE “H”
55 SEG17 (P66) N.C
56 SEG16 (P67) N.C
57 SEG15 (P90) HI-CUT OUTOUT (1) (OUT)
58 SEG14 (P91) HI-CUT OUTOUT (2) (OUT)
59 SEG13 (P92) HI-CUT OUTOUT (4) (OUT)
60 SEG12 (P93) HI-CUT OUTOUT (8) (OUT)
61 SEG11 N.C
62 SEG10 N.C
63 SEG9 N.C
64 SEG8 N.C
65 SEG7 N.C
67 SEG5 N.C
68 SEG4 N.C
69 SEG3 N.C
70 SEG2 N.C
71 SEG1 N.C
72 SEG0 N.C
73 COM 3 N.C
74 COM 2 N.C
75 COM 1 N.C
76 COM 0 N.C
77 VLC N.C
78 N.C N.C
79 N.C N.C
80 N.C N.C

Main PCB
IC-8
X24C02
PIN DESCRIPTION
A0 A1 A2 Address Inputs
SDA Serial Data
SCL Serial Clock
WC Write Control
VSS Ground
VCC Supply Voltage