HYT TC-518 User manual

TC-
518 Service Manual
1
Contents
Introduction ....................................................................................................................... 2
Safety Information............................................................................................................. 2
Radio Overview ................................................................................................................. 3
Software Specifications.................................................................................................... 5
Circuit Description ............................................................................................................ 8
CPU Pins.......................................................................................................................... 13
TC-518 Parts List 1 .......................................................................................................... 16
Adjustment Description.................................................................................................. 26
Troubleshooting Flow Chart........................................................................................... 38
Disassembly and Assembly for Repair.......................................................................... 41
Exploded View.................................................................................................................46
TC-518 Parts List 2 .......................................................................................................... 47
Packing............................................................................................................................. 49
TC-518 PCB View Top Layer........................................................................................... 50
TC-518 PCB View Bottom Layer..................................................................................... 51
TC-518 Level Diagram..................................................................................................... 52
TC-518 Block Diagram .................................................................................................... 53
TC-518 Schematic Diagram(VCO&PLL&RF) ................................................................. 54
TC-518 Schematic Diagram(LED&Knob Board)............................................................ 55
TC-518 Schematic Diagram(MCU&Power&AF) ............................................................. 56
Specifications.................................................................................................................. 57

TC-
518 Service Manual
2
Introduction
Manual Scope
This manual is intended for use by experienced technicians familiar with similar types of communication equipment. It
contains all service information required for the equipment and is current as of the publication date.
Safety Information
The following safety precautions shall always be observed during operation, service and repair of this equipment.
◇This equipment shall be serviced by qualified technicians only.
◇Use only HYT supplied or approved batteries and chargers.
◇To avoid electromagnetic interference and/or compatibility conflicts, turn off your radio in any area where posted
notices instruct you to do so. Turn off your radio before boarding an aircraft. Any use of a radio must be in
accordance with airline regulations or crew instructions.
◇For vehicles with an air bag, do not place a radio in the area over an air bag or in the air bag deployment area.
◇Turn off your radio prior to entering any area with explosive and flammable materials.
◇Do not charge your battery in a location with explosive and flammable materials.
◇Turn off your radio before entering a blasting area.
◇Do not use any portable radio that has a damaged antenna. If a damaged antenna comes into contact
with your skin, a minor burn can result.
◇Do not expose the radio to direct sunlight over a long time, nor place it close to heating source.
◇When transmitting with a portable radio, hold the radio in a vertical position with the microphone 3 to 4
centimeters away from your lips. Keep antenna at least 2.5 centimeters away from your body when transmitting.

TC-
518 Service Manual
3
Radio Overview
PTT (Push-to-Talk) Key
Press and hold down thePTT key to transmit, and release it to receive.
SK1
SK1 is a programmable key that can be assigned with press function by your dealer.
SK2
SK2 is a programmable key that can be assigned with press function by your dealer.
Channel Selector Knob
Rotate the knob to select from channel 1 to channel 16.
Volume Control Knob
Turn the volume control knob up/down to increase/decrease the volume.
LED Indicator See table below for status of LED Indicator and alert tone：
(1) Power On/Off Key (2) PTT (Push-to-Talk) Key (3) SK1 (programmable key) (4) SK2
(programmable key)
(5) Antenna (6) LED Indicator (7) Channel Selector Knob (8) Channel Indicator
(9) Volume Control Knob (10) Microphone (11) Speaker (12) Battery Latch
(13) Audio Accessory Jack
and Programming Port (14) Accessory Jack Cover (15) Belt Clip (16) Battery
(17) Belt Clip Screw (18) Charging Piece

TC-
518 Service Manual
4
Function Status of LED Indicator and Alert Tone
User Wired
Clone
Enter the User Wired Clone Mode
Hold down the SK for 2 seconds to power on the source radio,
and red LED flashes once.
Power on the target radio directly.
Status of the source radio (After the
target radio is powered on and
installation of clone cable is
completed, press PTT to begin to
clone.)
During cloning process, red LED glows.
Clone errors:
a. User Clone. Once clone begins, frequency band
and Model ID will be checked.
LED glows orange for 2 seconds and then goes out to
indicate a failed check. If the check is successfully
carried out but error data clone occurs, LED will flash
orange. In this situation, press any key other than the
power switch to turn it off.
b. Factory clone. If error data clone occurs, LED will
flash orange. In this situation, press any key other
than the power switch to turn it off.
Once clone is completed, green LED solidly glows.
LED flashes red when it indicates low voltage, which will not
be responded in the clone mode.
Status of the target radio LED solidly glows green when cloning is in progress.
Green LED goes out when cloning is completed.
Power On (enter User Mode)
When the radio is on, the alert tone sounds, and orange LED
flashes once.
When the current channel is a blank channel, the radio sounds
beep tone continuously.
Low Battery Alert LED flashes red, and a low-pitched tone sounds at intervals of
10 seconds.
Transmit
Red LED solidly glows.
When TOT timer expires, the radio sounds beep tone
continuously.
TOT pre-alert: a beep is heard.
Receive LED glows green when carrier is present.
Scan
Green LED flashes at every 1 second, while scanning is in
process.
Scan Start Alert Tone (programmable by your dealer): a beep
is heard.
Scan Exit Alert Tone (programmable by your dealer): a beep is
heard.
Programming Reading: red LED glows.
Writing: green LED glows.
Power Adjustment
A low-pitched tone is heard when transmit power is switched
from high power to low power.
A high-pitched tone is heard when transmit power is switched
from low power to high power.

TC-
518 Service Manual
5
VOX The alert tone sounds once when the VOX feature is activated.
The alert tone sounds twice when the VOX feature is disabled.
Programmable Key Functions
The following auxiliary functions are programmable forSK1 and SK2 by your dealer.
None
Monitor
Monitor Momentary
Scan
Squelch Off
Squelch Off Momentary
Power Adjustment
Battery Strength Indicator
VOX (Voice-Operated Transmit)
Compandor
Scrambler
Channel Lock
Functions below are programmed by factory default:
Key Operation TC-518
SK1 Short press VOX
Long press Squelch Off Momentary
SK2 Short press Scan
Long press Battery Strength Indicator
Note: Short press: key-press time is no longer than 1 second;
Long press: key-press time is longer than 1 second.
Software Specifications
Feature Description
1. 1 - 16 channels available
2. Channel Spacing: 25KHz/12.5KHz
3. Channel Scan
4. Tx / Rx Status Indicator (Red & Green LED)
5. CTCSS/CDCSS Codec (38 groups of CTCSS, 83 groups of CDCSS, and CTCSS Tail Revert by 180 degree )
6. Low Battery Alert
7. Automatic Battery Save
8. Unlock Detection and Emergency Alarm
9. Nine selectable Squelch levels
10. Monitor
11. Time-out Timer (TOT)
12. Squelch Tail Elimination
13. PC Programming (manual / automatic adjustment)
14. High/Low Power Switch (2.0/4.0W)
15. Wide & Narrow Band Compatibility
16. Busy Channel Lockout (transmission prohibited in busy status)

TC-
518 Service Manual
6
17. Wired Clone
18. Battery Strength Indicator
19. Manual Tuning
20. VOX and five selectable sensitivity levels
Mode Description
User Mode
Conventional Communication Mode: the default mode after power-on.
PC Programming Mode
PC programming software will bring the radio into PC Programming Mode through communication based on specific
communication protocol. In this mode, it works out to set radio functions and adjustment parameters by applying PC
programming software (including User Version and Factory Version).
Wired Clone Mode
1. Description
Wired Clone Mode is an independent mode. To access other modes, you must restart the radio.
Wired Clone Mode covers user wired clone mode and factory wired clone mode.
1) User Wired Clone Mode:
Connect two radios by using a cloning cable. Simultaneously hold down SK1 and Power On key to power on the
source radio so that the wired clone mode will be entered after 2 seconds, and then directly power on the target radio
to enter the user mode. In this mode, parameter data stored in EEPROM of the source radio will be cloned to
EEPROM of the target radio. The range of data transmitted only covers channel data and common parameters,
excluding adjustment data, version and serial No. of the model.
2) Factory Wired Clone Mode:
Connect two radios using a cloning cable. Simultaneously hold downSK1 and Power On key to power on the source
radio so that the wired clone mode will be entered after 2 seconds, and then press SK1 to switch to factory wired
clone mode (when the wired clone mode is entered, the user wired clone mode is defaulted); then directly power on
the target radio to enter the user mode. The range of transmitted data covers all data (including flag of manual
adjustment switch) stored in EEPROM, with exclusion of the serial No.
2. Process
Process of Wired Clone:
1) Red LED flashes once after the source radio enters wired clone mode. Press PTT to clone data to the target radio.
2) During communication, red LED of the source radio glows, and green LED of the target radio glows. When the
communication ends, green LED of the source radio glows and the green LED of the target radio goes out, which
indicates the preparation for another clone.
3) Stop the communication if any abnormality occurs during communication. Orange LED of the source radio glows,
which indicates the preparation for another clone.
4) When the communication ends, the source radio goes back to standby status. Press PTT again to begin with clone.
Manual Adjust Mode
Hold down PTT,SK1 and Power On key for 2 seconds to power on the radio and enter the Manual Adjust Mode. (Note:
This operation is subject to the option Manual Adjust Disable in the programming software.)When manual adjustment
function is disabled, the radio will be unable to enter the adjustment mode. It helps avoid parameter modification and
performance decrease caused by user’s misoperations.
Disable this function after the value is well-adjusted during production to avoid any unexpected value modification. The
adjusted value can only be reset and changed in Factory Adjust Mode to meet different requirements.
Adjustment Instructions are as follows:

TC-
518 Service Manual
7
1) Access to Manual Adjust Mode:
Hold down PTT,SK1 and Power On key to power on the radio for 2 seconds or longer. In case of a longer period (longer
than 2 seconds), the orange LED (red LED plus green LED) glows, which indicates that the adjustment mode has been
entered. When the key is released, the radio will enter Item N of Tx group (N depends on the position where the channel
selector knob locates). Red LED glows in adjustment status of Tx group; green LED glows in adjustment status of Rx
group.
2) Switch of adjustment items in Tx group and Rx group:
This operation is done through the channel selector knob.
Red LED solidly glows when you are adjusting items in Tx group.
Green LED solidly glows when you are adjusting items in Rx group.
3) Switch of adjustment items in Tx group/Rx group:
This action is carried out by applying channel selector knob as follows:
Tx group: CH1-CH9, respectively stands for Tx low power, Tx high power, CDCSS balance, CDCSS deviation, CTCSS
deviation (low), CTCSS deviation (medium), CTCSS deviation (high), Tx low voltage threshold and Max. Tx audio
deviation.
Red LED solidly glows when you are adjusting items CH1-CH9.
Rx group: CH10-CH12, respectively stands for normal carrier squelch open, normal carrier squelch close and Rx low
voltage threshold.
Green LED solidly glows when you are adjusting items CH10-CH12.
With invalid CH13-CH16, no adjustment item can be found and LED goes out.
4) Wide/Narrow band switch for a certain adjustment item:
When adjusting a certain item, short press SK1 (orange LED flashes indicating valid press) to switch between
wide/narrow band. Then the first frequency of current bandwidth is the frequency to be adjusted by default.
5) Frequency switch under certain bandwidth and certain adjustment item
Short press (no longer than 1 second) PTT (green LED flashes indicating valid press) and automatically switch
adjustment frequencies under certain bandwidth and certain adjustment item.
6) Add/Subtract the adjustment value under certain bandwidth and certain adjustment item:
Rotate the volume control knob upwards, and the adjustment value will increase by 1 under certain bandwidth and certain
adjustment item; hold the knob up without release, and the adjustment value will keep increasing continuously in steps of
1. The adjustment value will keep unchanged once it reaches its maximum value.
Rotate the volume control knob upwards, and the adjustment value will decrease in steps of 1 under certain bandwidth
and certain adjustment item; hold the knob up without release, and the adjustment value will keep decreasing
continuously in steps of 1. The adjustment value will keep unchanged once it drops to its minimum value.
7) Measures on Special Items:
Tx group: Ch8 is the Tx low voltage threshold. These adjustment items are related to AD sampling. Rotate the volume
control knob up or down to activate AD sampling (including calculation) for one time after entering the above mentioned
adjustment options. Rotate the channel selector knob and save the current AD sampling value. If you do not rotate the
volume control knob, neither the AD sampling will be activated, nor the original adjustment value will be updated.
Rx group: CH10-CH12, respectively stands for normal carrier squelch open, normal carrier squelch close and Rx low
voltage threshold. These adjustment items are related to AD sampling. Rotate the volume control knob up or down to
activate AD sampling (including calculation) for one time after entering the above mentioned adjustment options. Rotate
the channel selector knob and save the current AD sampling value. If you do not rotate the volume control knob, neither
the AD sampling will be activated, nor the original adjustment value will be updated.
8) Description of Key-press:
Short press: key-press time is no longer than 1 second.
Long press: key-press time is longer than 1 second.

TC-
518 Service Manual
8
Circuit Description
1.1 General Principle
Tx section: The modulated signal from MIC is directly sent to MCU chip (U604) for A-D conversion to digital signal,
processing such as filtering, signal compression, encryption, pre-emphasis, Tx gain control and amplitude limiting, and
restoration to modulated signal via D-A conversion. The modulated signal from MCU passes through RC low-pass filter
circuit, and enters VCO together with CTCSS/CDCSS signal generated by MCU for direct frequency modulation (The
PLL system is composed of U101, Q104 and Q105.). The modulated audio signal and CTCSS/CDCSS signaling are
transferred to RF carrier signal. The modulated RF carrier signal is converted to RF signal by the buffer amplifier Q106
and Q109, and then enters the preamplifier Q402, where the signal power is amplified. The RF signal is further amplified
by the pre-driver Q403 to drive the final power amplifier Q404 to get signals of the desired power. The amplified signal
enters the low-pass filter circuit through the diode D402 and D404, and then it is transmitted from the antenna after
high-order harmonics are removed. D402/D404 and D501/D502 compose the Rx-Tx switch circuit.
Rx section:Desired/Undesired RF signal is received via the antenna, and goes through the bandpass filter (composed of
D503, D504 and D505) to filter the undesired out-of-band interference signal. Then the desired RF signal enters the
high-frequency low-noise amplifier Q618, where the desired signal is amplified. The amplified signal goes through the
bandpass filter (composed of D506 and D507) again to filter the undesired out-of-band interference signal. The desired
RF signal is mixed with the first local oscillator signal (output from VCO) at Q502. The newly generated signal is
processed by the crystal filter (XF503), which brings the first IF signal (desired). After amplified by Q505, this IF signal
enters the IF demodulation IC (U301), and it is mixed with the second local oscillator signal to generate the second IF
signal. Then the second IF signal is demodulated by U301 and outputs in the form of audio signal, which is sent to MCU
for A-D conversion and filtering. Afterwards, the audio signal is divided into two flows for further processing: one flow is
processed by CTCSS/CDCSS decoder; the other is restored to audio signal through filtering, de-emphasis, decoding and
D-A conversion. Then the restored audio signal is processed by the audio power amplifier (U302) to drive the speaker
directly.
Power Supply Section: The 7.4V battery voltage goes through LDO IC U601, and generates 5V DC steady voltage,
which is divided into two flows. One flow is converted to 4.5V voltage output (one flow supplies the Txcircuit with 4.5T and
the other flow supplies VCO as V_SAVE under MCU control; V_SAVE flow is converted to 4.5R through Q604 and
supplies the Rx circuit.) through double-channel LDO U602. The other flow is converted to 3.0V voltage output through
double-channel LDO U603, and supplies MCU and PLL.
Signaling Code: CTCSS/CDCSS generated by MCU is divided into two flows. One flow. is output through MOD port, and
sent to VCO together with audio signal for modulation through RC filter network. The other flow is output through D/Aport,
and goes through RC network to modulate the PLL reference frequency oscillator.

TC-
518 Service Manual
9
1.2. Realization Methods for Basic Functional Modules
1.2.1 HF Sections
(1) Block diagram of PLL circuit:
PLL
38.4MHz
MB15E03SL
QT
U101
D102
TCXO
DATA
BB179
PLL_LE
CLK
PLL_LD
TXVCO
2SK508NV
Q104
FLITER
LOOP 2SK508NV Q105
Q106
2SC51082SC5108
RX SW
MA2S077
D508
MA2S077
D401
TX SW
RXVCO
MOD
1st LO
TX RF
PLL circuit mainly generates RF carrier signal (for Tx) and 1st local oscillator signal (for Rx).
PLL: Step frequency of the PLL circuit is 5.0KHz or 6.25KHz. In U101, the 38.4MHz reference oscillator signal is divided
into 5.0KHz or 6.25KHz reference frequencies via a fixed counter in PLL. The signal output from the VCO
(TXVCO/RXVCO) is buffer amplified by Q106 and enters PLL where the signal is divided by the variable frequency-divider.
In the phase detector (PD) of PLL, new signal generated in frequency division is compared with the reference frequency.
After passing through a low-pass filter, the signal output from PD is sent to the varactor of VCO so as to control its output
frequency.
VCO: Both Tx and Rx have a VCO section. Tx mode: PLL generates voltage to control the varactor by PD and low-pass
filter (LOOP FILTER) so as to make TX VCO produce RF carrier signal which is consistent with MCU preset frequency.
The modulated signal processed by MCU is transferred to RF carriers through D102, and buffer amplified. Then the signal
is sent to RF power amplifier for further amplification.
Rx mode: RXPLL generates voltage to control the varactor by PD and low-pass filter (LOOP FILTER) so as to make RX
VCO produce the first local oscillator signal which is consistent with MCU preset frequency, and then it is mixed with the
received RF signal in mixing tube Q502 to generate the first IF signal.
Unlock Detector: In case any LD pin of U101 is at low level, it indicates an unlocked status. When the microprocessor
detects such situations, Tx/Rx operation is prohibited, and the unlock alarm sounds.
(2) Block diagram of RF power amplifier:
APC
AMP AMP LPF
D402
ANT
MA2Z077
TX SW
Q404
AMP
RQA0002
RD01
Q403
2SC4988
Q402
U401
NJM2904
TX RF

TC-
518 Service Manual
10
The modulated carrier signal from Q109 is preamplified at Q402, and then enters Q403 for amplification of driver stage to
drive the final power amplifier Q404, which further amplifies the input RF signal. The last amplified RF signal enters LC
low-pass filter circuit (LPF) through diode D402, and then it is transmitted from the antenna after the high-order harmonics
are removed by LPF.
APC is composed of U401 and peripheral components. U401 controls Tx current by controlling the bias voltage at the
gates of Q403 and Q404 so as to control the power.
(3) Block Diagram of Rx LNA and the First Mixing circuit:
TU
1st MIX
BPF
BPF
2SK318
AT41511
Q502
Q618
ANT
LPF
LNA
D501
RX SW
D502
MA2S077*2
1st IF
1st LO
Desired/Undesired RF signal is received via the antenna, and goes through the bandpass filter to filter the undesired
out-of-band interference signal. Then the desired RF signal enters the high-frequency low-noise amplifier Q618, where
the desired signal is amplified. The amplified signal goes through the bandpass filter again to filter the undesired
out-of-band interference signal. The desired RF signal is mixed with the first local oscillator signal output from VCO at
Q502.
MCU controls the center frequency of tunablebandpass filter by output voltage from APC/TU pins.
1.2.2 IF Processing and Audio Demodulation
AF
SQL IF FLITER U301
IF SYSTEM
AT31136
XF503
450KHz DEL COIL
Z501 CD501
BPF
2nd LO
IF
Q505
IF AMP
The signal (mixed at Q502) is processed by crystal filter XF503, and the first IF signal (38.85MHz) is generated. After
amplified at Q505, this IF signal enters the IF demodulation IC (U301), and it is mixed with the second local oscillator
signal to generate the second IF signal (450KHz). Then the second IF signal is demodulated by U301 and outputs in the
form of audio signal, whichis sent to MCU for A-D conversion and filtering. Afterwards, the audio signal is divided into two
flows for further processing: one flow is processed by CTCSS/CDCSS decoder; the other is restored to audio signal
through filtering, de-emphasis, decoding, signal expansion and D-A conversion. Then the restored audio signal is
processed by the audio power amplifier (U302) to drive the speaker directly.

TC-
518 Service Manual
11
1.2.3 MCU Control, Signal Processing and Audio Amplification
Circuit diagram of this section is shown as below:
HPF
U302
AF AMP
Q303
V_BAT
DC SW
Q302
TDA2822
APA_EN
FMT717
AT24C64
DCT114EE
R3112Q271A
U607 U605
LPF
AUDIO_CTL
VOX_DET
PORT
INPUT
KEYS
SK2PTT
TXD
SK1
VOL_UP
ALARM
VOL_DOWN
SW601
SW_channel
VOX_DET
VOX D210
Q201
POWER SW
MCU
U604
/CDCSS
CTCSS
RESET
DTMF
EEPROM
ADC
32.768KHz
X601
EXT_MIC
Q201
MOD
Compressor
VOX
HPF
Encryotion
Limiter
DTMF
Pre-emph
DAC
DEMOD
DAC ADC
CTCSS
/CDCSS
TONE(DTMF)
TONE
PORT
OUTPUT
VT_CTL
/QT
APA_EN
SAVE_CTL
VR_CTL
CLK
DATA
APC/TU
PLL_LE
PLL_LD
OPT_SEL
EXT_PTT
BAT DET
RSSI
SQL
Expander
RXD
De-emphDecryotion
LPF
(1) MCU Control Circuit
MCU control circuit is composed of MCU, EEPROM and keys, etc. This section features the following functions: to
initialize data of the radio and save data in EEPROM; to detect and respond to signals from external keys, LD and
VOX-DET, and battery voltage; to transmit the required data to PLL based on the channel encoding status; to switch and
control Rx/Tx based on the input PTT signal; to control the squelch circuit (on/off) based on the input signaling decode
signal and squelch level signal; to output control signal to control circuit of high/low power switch, audio power amplifier,
VCO power supply, Rx power supply and Tx power supply; to communicate with PC by transmitting and receiving data
between the RXD/TXD and PC based on RS232 protocol during programming by users.
(2) Signal Processing
a. Tx Baseband Processing
Audio signal from MIC is divided into two flows. One flow enters U604 directly, and it is converted to digital signal by
analog-to-digital conversion (ADC). After filtered by the digital low-pass filter, the signal is sent for digital processing such
as AGC, companding, high-pass filtering, encryption and pre-emphasis. Then this signal is superposed with
CTCSS/CDCSS signal from MCU, converted to baseband signal by digital-to-analog converter (DAC), and put out.
Afterwards, this signal is processed by the active low-pass filter, and sent to VCO for modulation. The other flow is
converted to DC level at Q201 and D210, and sent to MCU as VOX energy detector.
b. Rx Baseband Processing
After the DEMOD signal demodulated at IF enters U604, a digital signal is generated as A-D conversion is completed.
Then, the signal enters digital LPF for further filter.The signal is divided into 2 flows. One flow is processed by
CTCSS/CDCSS signaling decoder; the other is processed through high-pass filtering, de-emphasis, decryption and signal
expansion (volume control of audio digital signal), etc, and finally outputs audio signal via digital-to-analog conversion.
(3) Audio Power Amplifier
The digital audio signal demodulated at U604 is processed with volume control (digital gain control in MCU), and
converted to analog signal via D/A conversion. Then it enters audio power amplifier IC (U302) for audio power
amplification to drivethe speaker directly.

TC-
518 Service Manual
12
1.2.4 Power Supply Processing
Block diagram of power supply is shown as below:
7.4V
BATTERY
XC6401FF55
XC6209E502R
Q603
Q602
Q601
SAVE_CTL
VT_CTL
XC6401FF37
Q606
VDD
U602
U601
U603
VR_CTL
VT
POWER SW
V_SAVE
VR
LDO
LDO
LDO
Power Supply Section: The 7.4V battery voltage is converted to 5V DC voltage through LDO IC U601. One flow is
converted to 4.5V DC voltage by double-channel LDO U602 to supply the Tx/Rx/VCO circuit, and the other flow is
converted to 3.3V DC voltage by U603 to supply the MCU/EEPROM/PLL.

TC-
518 Service Manual
13
CPU Pins
PIN NO. PORT Pin Name I/O Function
1 NC / / /
2 NC / / /
3 NC / / /
4 NC / / /
5 NC / / /
6 TXD TXD O UART TxD
7 RXD RXD I UART RxD
8 P60 APA_EN O Speaker switch control, H: on; L: off.
9 P61 SAVE_CTL O Power save control. In non-power-save status, it is
set at high level.
10 P62 MIC_EN I Check MIC connection (available for high level)
11 P63 EXT PTT I PTT key on the earpiece (available for high level)
12 P64 RLED O Red LED
13 P65 GLED O Greed LED
14 P66 Reserve O
15 P67 Reserve O
16 Vssd GND S Power grounding of digital circuit
17 Vddd VCC（3.3V）S Power supply of digital circuit
18 P50/INT0 VOL+ I To increase the volume
19 P51/INT1 VOL- I To decrease the volume
20 P52/INT2 / I
21 P53/INT3 SK2 I Programmable function key (SK2)
22 P54/INT4 SK1 I Programmable function key (SK1)
23 P55/INT5 PTT I PTT key (available for low level)
24 P56/INT6 Reserve O
25 P57/INT7 Reserve O
26 Vdd_CLD VCC（3.3V）S Power supply of digital power amplifier
27 CLD_OUTP CLD_OUTP O LINEOUT output; positive output of digital power
amplifier
28 VSS_CLD GND S Power grounding of digital power amplifier
29 CLD_OUTM Reserve Negative output of digital power amplifier
30 Vdd_CLD VCC（3.3V）S Power supply of digital power amplifier
31 P77 T/R_CTRL O Rx/Tx control, H: Rx; L: Tx (switch to VCO)
32 P76/DAC1 APC/TV DA Tx power control, Rx bandpass control/Tx power
control
33 P75/VREF VCC（3.3V）I Input of exterior reference voltage of ADC and
DAC Pin
34 P74/DAC0 QT_OUT DA CTCSS/CDCSS Output
35 P73/AD3 Reserve AD
36 Vssa GND S Power grounding of the analog circuit

TC-518 Service Manual
13
37 Vdda VCC（3.3V）S Power supply of analog circuit
38 P72/AD2 Reserve AD
39 P71/AD1 SQL AD Noise detect
40 P70/AD0 BAT_DET AD Battery strength detect
41 XTAL0 OSC0 32.678KHz Main crystal oscillator Pin
42 XTAL1 OSC1
43 PLL_CAP PLL_CAP PLL external capacitor (10nF) connection
44 NC / / /
45 NC / / /
46 NC / / /
47 NC / / /
48 NC / / /
49 P03/COM3 PWR_ON/OFF O Power output control
50 P02/COM2 PWR_DET I Power On/Off detect
51 P01/COM1 Reserve O
52 P00/COM0 Reserve O
53 P10/SEG0 Reserve O
54 P11/SEG1 Reserve O
55 P12/SEG2 Reserve O
56 P13/SEG3 Reserve O
57 P14/SEG4 Reserve O
58 P15/SEG5 PWR_LIGHT O Power LED control; blue LED.
59 P16/SEG6 Reserve O
60 P17/SEG7 Reserve O
61 P20/SEG8 CE0 I Pin for detecting encode switch input
62 P21/SEG9 CE1 I
63 P22/SEG10 CE2 I
64 P23/SEG11 CE3 I
65 P24/SEG12 Reserve O
66 P25SEG13 Reserve O
67 P26/SEG14 Reserve O
68 P27/SEG15 Reserve O
69 P30/SEG16 Reserve O
70 P31/SEG17 Reserve O
71 NC / / /
72 NC / / /
73 NC / / /
74 NC / / /
75 NC / / /
76 P32/SEG18 Reserve I/O
77 P33/SEG19 Reserve O
78 P34/SEG20 Reserve O
14

TC-518 Service Manual
15
79 P35/SEG21 Reserve O
80 P36/SEG22 Reserve O
81 P37/SEG23 Reserve O
82 P40/SEG24 Reserve O
83 P41/SEG25 SCL O EEPROM CLOCK
84 P42/SEG26 SDA O EEPROM DATA
85 P43/SEG27 LD I Unlock detection of PLL circuit (H: lock; L: unlock)
86 P44/SEG28 DATA O PLL DATA
87 P45/SEG29 CK O PLL CLOCK
88 P46/SEG30 STB O PLL ENABLE
89 Vssd GND S Power grounding of digital circuit
90 Vddd VCC（3.3V）S Power supply of digital circuit
91 SW_P0 Reserve O
92 SW_P1 TX_CTRL O Tx power control (high level Tx)
93 RESET RESET I
94 Vssa GND S Power grounding of the analog circuit
95 Vdda VCC（3.3V）S Power supply of analog circuit
96 BG_REF O Output pin of reference voltage
97 MIC_IN MIC_IN I Input pin of microphone
98 DEMODE DEMODE I Input pin of base-band signals (audio and
CTCSS/CDCSS)
99 MODOUT MODOUT O Output pin of base-band signals (audio and
CTCSS/CDCSS)
100 NC / / /

TC-
518 Service Manual
16
TC-518 Parts List 1
No. Material No. Description Qty. Ref No. Print No.
1 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 C622 B4I
2 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 R105 T4G
3 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 R111 T3G
4 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 R115 T4H
5 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 R309 B2E
6 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 R509 T2F
7 3001050000000 Chip resistor 0402 0ΩJ 1/16W 1 R515 T1F
8 3001051000020 Chip resistor 0402 10ΩF 1/16W 1 R133 T3G
9 3001051000020 Chip resistor 0402 10ΩF 1/16W 1 R303 T2I
10 3001051000020 Chip resistor 0402 10ΩF 1/16W 1 R410 T4F
11 3001051000020 Chip resistor 0402 10ΩF 1/16W 1 R413 T4F
12 3001051010040 Chip resistor 0402 100ΩF 1/16W 1 R112 T3G
13 3001051010040 Chip resistor 0402 100ΩF 1/16W 1 R535 T1H
14 3001051010040 Chip resistor 0402 100ΩF 1/16W 1 R615 B2I
15 3001051010040 Chip resistor 0402 100ΩF 1/16W 1 R622 B4I
16 3001051010040 Chip resistor 0402 100ΩF 1/16W 1 R632 B4H
17 3001051010040 Chip resistor 0402 100ΩF 1/16W 1 R637 B4H
18 3001051010040 Chip resistor 0402 100ΩF 1/16W 1 R642 B4H
19 3001051020000 Chip resistor 0402 1KΩF 1/16W 1 R110 T4G
20 3001051020000 Chip resistor 0402 1KΩF 1/16W 1 R116 T4I
21 3001051020000 Chip resistor 0402 1KΩF 1/16W 1 R215 B1H
22 3001051020000 Chip resistor 0402 1KΩF 1/16W 1 R313 B2E
23 3001051020000 Chip resistor 0402 1KΩF 1/16W 1 R516 T2F
24 3001051020000 Chip resistor 0402 1KΩF 1/16W 1 R619 B1F
25 3001051020000 Chip resistor 0402 1KΩF 1/16W 1 R625 B4I
26 3001051020000 Chip resistor 0402 1KΩF 1/16W 1 R640 B2H
27 3001051020000 Chip resistor 0402 1KΩF 1/16W 1 R641 B2H
28 3001051030000 Chip resistor 0402 10KΩJ 1/16W 1 R136 T2F
29 3001051030000 Chip resistor 0402 10KΩJ 1/16W 1 R401 T3F
30 3001051030000 Chip resistor 0402 10KΩJ 1/16W 1 R427 B4E
31 3001051030000 Chip resistor 0402 10KΩJ 1/16W 1 R605 T2E
32 3001051040000 Chip resistor 0402 100KΩF 1/16W 1 R106 T3G
33 3001051040000 Chip resistor 0402 100KΩF 1/16W 1 R108 T4H
34 3001051040000 Chip resistor 0402 100KΩF 1/16W 1 R114 T4I
35 3001051040000 Chip resistor 0402 100KΩF 1/16W 1 R205 B2H
36 3001051040000 Chip resistor 0402 100KΩF 1/16W 1 R501 T3C
37 3001051040000 Chip resistor 0402 100KΩF 1/16W 1 R502 T3C
38 3001051040000 Chip resistor 0402 100KΩF 1/16W 1 R507 T3E
39 3001051040000 Chip resistor 0402 100KΩF 1/16W 1 R508 T3E
40 3001051040000 Chip resistor 0402 100KΩF 1/16W 1 R510 T2F
41 3001051040000 Chip resistor 0402 100KΩF 1/16W 1 R512 T2F
42 3001051040000 Chip resistor 0402 100KΩF 1/16W 1 R601 T2D
43 3001051040000 Chip resistor 0402 100KΩF 1/16W 1 R602 T2E
44 3001051040000 Chip resistor 0402 100KΩF 1/16W 1 R603 T2D
45 3001051040000 Chip resistor 0402 100KΩF 1/16W 1 R604 B2D
46 3001051040000 Chip resistor 0402 100KΩF 1/16W 1 R606 T4J
47 3001051040000 Chip resistor 0402 100KΩF 1/16W 1 R609 T2E
48 3001051040000 Chip resistor 0402 100KΩF 1/16W 1 R620 T1D
49 3001051050000 Chip resistor 0402 1MΩF 1/16W 1 R426 B4F
50 3001051050000 Chip resistor 0402 1MΩF 1/16W 1 R433 B4F
51 3001051050000 Chip resistor 0402 1MΩF 1/16W 1 R435 T3E
TC-518 Parts List 1 (Main Board)

TC-
518 Service Manual
17
52 3001051050000 Chip resistor 0402 1MΩF 1/16W 1 R629 B1F
53 3001051220000 Chip resistor 0402 1.2KΩJ 1/16W 1 R117 T4I
54 3001051230000 Chip resistor 0402 12KΩJ 1/16W 1 R503 T3D
55 3001051240000 Chip resistor 0402 120KΩJ 1/16W 1 R123 T3I
56 3001051510010 Chip resistor 0402 150ΩF 1/16W 1 R131 T3G
57 3001051520010 Chip resistor 0402 1.5KΩF 1/16W 1 R409 T3F
58 3001051520010 Chip resistor 0402 1.5KΩF 1/16W 1 R532 T1H
59 3001051530000 Chip resistor 0402 15KΩJ 1/16W 1 C168 T3I
60 3001051530000 Chip resistor 0402 15KΩJ 1/16W 1 R124 T3J
61 3001051530000 Chip resistor 0402 15KΩJ 1/16W 1 R210 B1H
62 3001051530000 Chip resistor 0402 15KΩJ 1/16W 1 R421 T4E
63 3001051530000 Chip resistor 0402 15KΩJ 1/16W 1 R530 T2H
64 3001051540000 Chip resistor 0402 150KΩF 1/16W 1 R126 T3J
65 3001051540000 Chip resistor 0402 150KΩF 1/16W 1 R511 T2F
66 3001051540000 Chip resistor 0402 150KΩF 1/16W 1 R513 T2F
67 3001051810010 Chip resistor 0402 180ΩJ 1/16W 1 R118 T4I
68 3001051820000 Chip resistor 0402 1.8KΩJ 1/16W 1 R414 T4F
69 3001051840000 Chip resistor 0402 180KΩJ 1/16W 1 R113 T3G
70 3001051840000 Chip resistor 0402 180KΩJ 1/16W 1 R208 B4H
71 3001052210000 Chip resistor 0402 220ΩJ 1/16W 1 R211 B1H
72 3001052220010 Chip resistor 0402 2.2KΩF 1/16W 1 R302 T3I
73 3001052220010 Chip resistor 0402 2.2KΩF 1/16W 1 R307 T1H
74 3001052220010 Chip resistor 0402 2.2KΩF 1/16W 1 R610 B1F
75 3001052230010 Chip resistor 0402 22KΩJ 1/16W 1 R310 B1D
76 3001052240000 Chip resistor 0402 220KΩJ 1/16W 1 R137 T4H
77 3001052240000 Chip resistor 0402 220KΩJ 1/16W 1 R623 T1D
78 3001052740000 Chip resistor 0402 270KΩJ 1/16W 1 R301 T2I
79 3001053310010 Chip resistor 0402 330ΩJ 1/16W 1 R411 T3F
80 3001053310010 Chip resistor 0402 330ΩJ 1/16W 1 R506 T3E
81 3001053310010 Chip resistor 0402 330ΩJ 1/16W 1 R514 T2F
82 3001053320000 Chip resistor 0402 3.3KΩJ 1/16W 1 R120 T3G
83 3001053320000 Chip resistor 0402 3.3KΩJ 1/16W 1 R130 T2G
84 3001053320000 Chip resistor 0402 3.3KΩJ 1/16W 1 R134 T3G
85 3001053320000 Chip resistor 0402 3.3KΩJ 1/16W 1 R135 T3F
86 3001053320000 Chip resistor 0402 3.3KΩJ 1/16W 1 R305 T2I
87 3001053330000 Chip resistor 0402 33KΩF 1/16W 1 R422 T4E
88 3001053340000 Chip resistor 0402 330KΩJ 1/16W 1 R434 B4F
89 3001053920010 Chip resistor 0402 3.9KΩJ 1/16W 1 R212 B1H
90 3001053920010 Chip resistor 0402 3.9KΩJ 1/16W 1 R214 B1H
91 3001053920010 Chip resistor 0402 3.9KΩJ 1/16W 1 R311 B1D
92 3001053930000 Chip resistor 0402 39KΩJ 1/16W 1 R314 T3I
93 3001054320000 Chip resistor 0402 4.3KΩJ 1/16W 1 R505 T3E
94 3001054700000 Chip resistor 0402 47ΩJ 1/16W 1 R415 T4E
95 3001054700000 Chip resistor 0402 47ΩJ 1/16W 1 R420 T4D
96 3001054700000 Chip resistor 0402 47ΩJ 1/16W 1 R612 B2I
97 3001054700000 Chip resistor 0402 47ΩJ 1/16W 1 R614 B2I
98 3001054720000 Chip resistor 0402 4.7KΩJ 1/16W 1 R101 T4G
99 3001054720000 Chip resistor 0402 4.7KΩJ 1/16W 1 R203 B2H
100 3001054720000 Chip resistor 0402 4.7KΩJ 1/16W 1 R204 B2H
101 3001054720000 Chip resistor 0402 4.7KΩJ 1/16W 1 R416 T4E
102 3001054720000 Chip resistor 0402 4.7KΩJ 1/16W 1 R436 B4F
103 3001054720000 Chip resistor 0402 4.7KΩJ 1/16W 1 R437 B4F
104 3001054720000 Chip resistor 0402 4.7KΩJ 1/16W 1 R626 B4I
105 3001054720000 Chip resistor 0402 4.7KΩJ 1/16W 1 R627 B4I
106 3001054720000 Chip resistor 0402 4.7KΩJ 1/16W 1 R628 B1F
107 3001054790000 Chip resistor 0402 4.7ΩJ 1/16W 1 R316 B1F

TC-
518 Service Manual
18
108 3001054790000 Chip resistor 0402 4.7ΩJ 1/16W 1 R317 B1F
109 3001054730000 Chip resistor 0402 47KΩJ 1/16W 1 R109 T4H
110 3001054730000 Chip resistor 0402 47KΩJ 1/16W 1 R125 T3I
111 3001054730000 Chip resistor 0402 47KΩJ 1/16W 1 R127 T3J
112 3001054730000 Chip resistor 0402 47KΩJ 1/16W 1 R207 B4H
113 3001054730000 Chip resistor 0402 47KΩJ 1/16W 1 R306 T2I
114 3001054730000 Chip resistor 0402 47KΩJ 1/16W 1 R312 B2E
115 3001054730000 Chip resistor 0402 47KΩJ 1/16W 1 R611 B2I
116 3001054730000 Chip resistor 0402 47KΩJ 1/16W 1 R613 B2J
117 3001054730000 Chip resistor 0402 47KΩJ 1/16W 1 R616 B2I
118 3001054730000 Chip resistor 0402 47KΩJ 1/16W 1 R617 B1F
119 3001054730000 Chip resistor 0402 47KΩJ 1/16W 1 R621 B1F
120 3001054730000 Chip resistor 0402 47KΩJ 1/16W 1 R633 B3J
121 3001054730000 Chip resistor 0402 47KΩJ 1/16W 1 R634 B3J
122 3001054730000 Chip resistor 0402 47KΩJ 1/16W 1 R635 B3J
123 3001054730000 Chip resistor 0402 47KΩJ 1/16W 1 R636 B3J
124 3001054740000 Chip resistor 0402 470KΩJ 1/16W 1 R308 T2H
125 3001055600000 Chip resistor 0402 56ΩJ 1/16W 1 R103 T4H
126 3001055600000 Chip resistor 0402 56ΩJ 1/16W 1 R107 T4G
127 3001055610000 Chip resistor 0402 560ΩJ 1/16W 1 R119 T4I
128 3001055610000 Chip resistor 0402 560ΩJ 1/16W 1 R213 B1H
129 3001055610000 Chip resistor 0402 560ΩJ 1/16W 1 R533 T2G
130 3001055610000 Chip resistor 0402 560ΩJ 1/16W 1 R534 T2H
131 3001055620010 Chip resistor 0402 5.6KΩF 1/16W 1 R132 T3G
132 3001055630000 Chip resistor 0402 56KΩJ 1/16W 1 R417 T4E
133 3001055630000 Chip resistor 0402 56KΩJ 1/16W 1 R531 T2H
134 3001055630000 Chip resistor 0402 56KΩJ 1/16W 1 R607 T2E
135 3001055630000 Chip resistor 0402 56KΩJ 1/16W 1 R608 T1E
136 3001055630000 Chip resistor 0402 56KΩJ 1/16W 1 R618 B1F
137 3001055630000 Chip resistor 0402 56KΩJ 1/16W 1 R638 B3J
138 3001056810000 Chip resistor 0402 680ΩJ 1/16W 1 R408 T3F
139 3001056820000 Chip resistor 0402 6.8KΩJ 1/16W 1 R504 T3D
140 3001056830000 Chip resistor 0402 68KΩJ 1/16W 1 R209 B1H
141 3001058220000 Chip resistor 0402 8.2KΩJ 1/16W 1 R425 B4E
142 3001058230000 Chip resistor 0402 82KΩJ 1/16W 1 R304 T3I
143 3001059130000 Chip resistor 0402 91KΩF 1/16W 1 R630 B1F
144 3001059130000 Chip resistor 0402 91KΩF 1/16W 1 R631 B1F
145 3001060000000 Chip resistor 0603 0ΩJ 1/10W 1 R412 T4D
146 3001061540000 Chip resistor 0603 150KΩJ 1/10W 1 R428 B4E
147 3001061540000 Chip resistor 0603 150KΩJ 1/10W 1 R429 B4E
148 3001061540000 Chip resistor 0603 150KΩJ 1/10W 1 R430 B4E
149 3001061540000 Chip resistor 0603 150KΩJ 1/10W 1 R431 B4E
150 3001061540000 Chip resistor 0603 150KΩJ 1/10W 1 R432 B4E
151 3001061540000 Chip resistor 0603 150KΩJ 1/10W 1 R441 B4E
152 3001062210000 Chip resistor 0603 220ΩJ 1/10W 1 R423 B3B
153 3005051020010 Resistor array 0402 1K*4 J 1/16W 1 RN101 T3I
154 3005051020010 Resistor array 0402 1K*4 J 1/16W 1 RN601 B2J
155 3099080398000 Chip resistor 1206 0.39ΩJ 1/4W 1 R438 B3D
156 3099080398000 Chip resistor 1206 0.39ΩJ 1/4W 1 R439 B3D
157 3099080398000 Chip resistor 1206 0.39ΩJ 1/4W 1 R440 B3D
158 3101050100030 Chip capacitor 0402 1PF B 50V 1 C502 T3B
159 3101050200010 Chip capacitor 0402 2PF B 50V 1 C553 T2G
160 3101050200010 Chip capacitor 0402 2PF B 50V 1 C555 T1H
161 3101050400010 Chip capacitor 0402 4PF B 50V 1 C501 T2B
162 3101050400010 Chip capacitor 0402 4PF B 50V 1 C530 T2F
163 3101050400010 Chip capacitor 0402 4PF B 50V 1 C532 T2F
164 3101050500010 Chip capacitor 0402 5PF B 50V 1 C117 T4H

TC-
518 Service Manual
19
165 3101050500010 Chip capacitor 0402 5PF B 50V 1 C503 T3C
166 3101050500010 Chip capacitor 0402 5PF B 50V 1 C508 T3D
167 3101050600010 Chip capacitor 0402 6PF B 50V 1 C153 T3G
168 3101050600010 Chip capacitor 0402 6PF B 50V 1 C170 T3G
169 3101050600010 Chip capacitor 0402 6PF B 50V 1 C174 T3G
170 3101050600010 Chip capacitor 0402 6PF B 50V 1 C407 T4F
171 3101050600010 Chip capacitor 0402 6PF B 50V 1 C507 T3D
172 3101050700010 Chip capacitor 0402 7PF B 50V 1 C517 T3E
173 3101050700010 Chip capacitor 0402 7PF B 50V 1 C529 T2F
174 3101050700010 Chip capacitor 0402 7PF B 50V 1 C533 T2F
175 3101057590000 Chip capacitor 0402 7.5PF(±0.1pF)(50V) 1 C525 T2F
176 3101050800000 Chip capacitor 0402 8PF B 50V 1 C131 T3H
177 3101050800000 Chip capacitor 0402 8PF B 50V 1 C504 T3B
178 3101050800000 Chip capacitor 0402 8PF B 50V 1 C523 T3F
179 3101050800000 Chip capacitor 0402 8PF B 50V 1 C541 T2F
180 3101050900000 Chip capacitor 0402 9PF B 50V 1 C528 T2F
181 3101051000020 Chip capacitor 0402 10PF J 50V 1 C164 T3I
182 3101051000020 Chip capacitor 0402 10PF J 50V 1 C165 T3I
183 3101051000020 Chip capacitor 0402 10PF J 50V 1 C310 T3I
184 3101051010030 Chip capacitor 0402 100PF J 50V 1 C140 T3I
185 3101051010030 Chip capacitor 0402 100PF J 50V 1 C141 T3I
186 3101051010030 Chip capacitor 0402 100PF J 50V 1 C142 T3I
187 3101051010030 Chip capacitor 0402 100PF J 50V 1 C143 T3I
188 3101051010030 Chip capacitor 0402 100PF J 50V 1 C510 T3D
189 3101051010030 Chip capacitor 0402 100PF J 50V 1 C513 T3E
190 3101051010030 Chip capacitor 0402 100PF J 50V 1 C514 T3E
191 3101051010030 Chip capacitor 0402 100PF J 50V 1 C526 T2F
192 3101051010030 Chip capacitor 0402 100PF J 50V 1 C655 B2H
193 3101051010030 Chip capacitor 0402 100PF J 50V 1 C656 B2H
194 3101051020010 Chip capacitor 0402 1000PF K 50V 1 C105 T4G
195 3101051020010 Chip capacitor 0402 1000PF K 50V 1 C107 T4G
196 3101051020010 Chip capacitor 0402 1000PF K 50V 1 C108 T4G
197 3101051020010 Chip capacitor 0402 1000PF K 50V 1 C119 T4H
198 3101051020010 Chip capacitor 0402 1000PF K 50V 1 C120 T4H
199 3101051020010 Chip capacitor 0402 1000PF K 50V 1 C123 T4H
200 3101051020010 Chip capacitor 0402 1000PF K 50V 1 C133 T3H
201 3101051020010 Chip capacitor 0402 1000PF K 50V 1 C137 T4I
202 3101051020010 Chip capacitor 0402 1000PF K 50V 1 C138 T3I
203 3101051020010 Chip capacitor 0402 1000PF K 50V 1 C163 T3I
204 3101051020010 Chip capacitor 0402 1000PF K 50V 1 C177 T4I
205 3101051020010 Chip capacitor 0402 1000PF K 50V 1 C204 B2I
206 3101051020010 Chip capacitor 0402 1000PF K 50V 1 C215 B1H
207 3101051020010 Chip capacitor 0402 1000PF K 50V 1 C318 T3I
208 3101051020010 Chip capacitor 0402 1000PF K 50V 1 C320 B2D
209 3101051020010 Chip capacitor 0402 1000PF K 50V 1 C328 B2E
210 3101051020010 Chip capacitor 0402 1000PF K 50V 1 C410 T4E
211 3101051020010 Chip capacitor 0402 1000PF K 50V 1 C418 T4E
212 3101051020010 Chip capacitor 0402 1000PF K 50V 1 C462 B3F
213 3101051020010 Chip capacitor 0402 1000PF K 50V 1 C505 T3C
214 3101051020010 Chip capacitor 0402 1000PF K 50V 1 C522 T3E
215 3101051020010 Chip capacitor 0402 1000PF K 50V 1 C557 T2H
216 3101051020010 Chip capacitor 0402 1000PF K 50V 1 C559 T1H
217 3101051020010 Chip capacitor 0402 1000PF K 50V 1 C601 T1D
218 3101051020010 Chip capacitor 0402 1000PF K 50V 1 C621 B4I
219 3101051020010 Chip capacitor 0402 1000PF K 50V 1 C626 B1G
220 3101051030020 Chip capacitor 0402 0.01UF K 25V 1 C314 T2H
221 3101051030020 Chip capacitor 0402 0.01UF K 25V 1 C322 B1E