IC-FR6100
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S-14419XZ-C1
Feb. 2008
UHF FM REPEATER
This service manual describes the latest service information
for the IC-FR6000 UHF DIGITAL REPEATER at the time of
publication.
NEVER connect the repeater to an AC outlet or to a DC
power supply that uses more than specifed. This will ruin
the repeater.
DO NOT expose the repeater to rain, snow or any liquids.
DO NOT reverse the polarities of the power supply when
connecting the repeater.
DO NOT apply an RF signal of more than 20 dBm (100 mW)
to the antenna connector. This could damage the repeater’s
front-end.
To upgrade quality, any electrical or mechanical parts and
internal circuits are subject to change without notice or
obligation.
MODEL VERSION
FREQUENCY
RANGE
CH. SPACING
TX
POWER
IC-FR6000
USA-01 400–470 MHz
6.25/12.5/25.0
kHz
50 W
USA-02 450–520 MHz
EXP-01 400–470 MHz
12.5/25.0 kHz
EXP-02 450–520 MHz
IC-FR6100 EUR-01 400–470 MHz
12.5/20.0/25.0
kHz
25 W
Be sure to include the following four points when ordering
replacement parts:
1. 10-digit Icom parts numbers
2. Component name
3. Equipment model name and unit name
4. Quantity required
<ORDER EXAMPLE>
1110003491 S.IC TA31136FNG IC-FR6000 MAIN UNIT 5 pieces
8820001210 Screw 2438 screw IC-FR6000 Top cover 10 pieces
Addresses are provided on the inside back cover for your
convenience.
Icom, Icom Inc. and
logo are registered trademarks of Icom Incorporated (Japan) in the United States, the United
Kingdom, Germany, France, Spain, Russia and/or other countries.
ORDERING PARTS
1. Make sure the problem is internal before disassembling
the repeater.
2. DO NOT open the repeater until the repeater is
disconnected from its power source.
3. DO NOT force any of the variable components. Turn
them slowly and smoothly.
4. DO NOT short any circuits or electronic parts. An
insulated tuning tool MUST be used for all adjustments.
5. DO NOT keep power ON for a long time when the
repeater is defective.
6. DO NOT transmit power into a Standard Signal
Generator or a Sweep Generator.
7. ALWAYS connect a 50 dB to 60 dB attenuator between
the repeater and a Deviation Meter or Spectrum
Analyzer when using such test equipment.
8. READ the instructions of test equipment throughly
before connecting a test equipment to the repeater.
REPAIR NOTES
INTRODUCTION CAUTION
UNIT ABBREVIATIONS:
F=FRONT UNIT
M=MAIN UNIT
CN=CONNECT UNIT
CONTENTS
SECTION 1 SPECIFICATIONS
SECTION 2 INSIDE VIEWS
SECTION 3 DISASSEMBLY INSTRUCTION
SECTION 4 OPTIONAL UNIT INSTALLATION
SECTION 5 CIRCUIT DESCRIPITON
5-1 RECEIVER CIRCUITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5-2 TRANSMITTER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5-3 OTHER CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
5-4 CPU (M: IC20) PORT ALLOCATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
SECTION 6 ADJUSTMENT PROCEDURES
6-1 PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
6-2 FREQUENCY ADJUSTMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
6-3 TRANSMIT ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
6-4 RECEIVE ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
SECTION 7 PARTS LIST
SECTION 8 MECHANICAL PARTS
SECTION 9 BOARD LAYOUTS
SECTION 10 BLOCK DIAGRAM
SECTION 11 VOLTAGE DIAGRAM
FRONT UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1
MAIN UNIT (1/3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-2
MAIN UNIT (2/3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-3
MAIN UNIT (3/3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-4
CONNECT UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-5
1 - 1
SECTION 1 SPECIFICATIONS
M GENERAL
[FR6000] [FR6100]
• Frequency coverage 400–470 MHz [USA-01], [EXP-01]
450–520 MHz [USA-02], [EXP-02]
400–470 MHz
• Conventional channels max. 32 ch
• Type of emission Wide
16K0F3E/11K0F3E/11K0F7E/ 1K0F7D/
11K0F7W
Wide 16K0F3E
– Middle 14K0F3E
Narrow 8K50F3E/8K10F1E/8K10F1D Narrow 8K50F3E
Digital 4K00F1E/4K00F1D/4K00F3E/6K00F3E
• Antenna impedance 50
Ω
(Nominal)
• Operating temperature range –22˚F to +140˚F (–30˚C to +60˚C) –25˚C to +55˚C
• Power supply requirement
(nominal)
13.6 V DC (Negative ground) 13.2 V DC (Negative ground)
• Current drain (Approx.) Receiving 500 mA (stand-by), 1900 mA (max. audio)
Transmitting 15 A (at 50 W) Transmitting 7.0 A (at 25 W)
• Dimensions
(Projections not included)
19
1
/32 (W)×3
15
⁄32 (H)×10
1
⁄4 (D) in. 483 (W)×88 (H)×260 (D) mm
• Weight (Approx.) 12 Ib
9
/16 oz. 5.6 kg
M TRANSMITTER
[FR6000] [FR6100]
• Output power 50 W 25 W
• Modulation Variable reactance frequency modulation
• Max. frequency deviation ±5.0 kHz (Wide)
– ±4.0 kHz (Middle)
±2.5 kHz (Narrow)
• Frequency stability ±0.5 ppm ±0.5 kHz
• Spurious emissions 80 dB typ. 0.25
μ
W (
≤
1 GHz), 1.00
μ
W (
>
1 GHz)
• Adjacent channel power Wide 73 dB typ. Wide 73 dB min.
– Middle 73 dB min.
Narrow 67 dB typ. Narrow 65 dB min.
Digital 65 dB typ. Digital 60 dB min.
• Audio harmonic distortion 1% typ. (at AF 1 kHz 40% deviation)
• Audio frequency response +2 dB to –8 dB of 6 dB/oct. Wide/Middle from 300 Hz–3000 Hz
Narrow from 300 Hz–2550 Hz
• FM Hum and noise
(300 Hz–3000 Hz, 750 us)
Wide 50 dB typ.
Narrow 45 dB typ.
1 - 2
M RECEIVER
[FR6000] [FR6100]
• Receive system Double-conversion superheterodyne system
• Intermediate frequencies 1st IF: 46.35 MHz, 2nd IF: 450 kHz
• Sensitivity Wide/Narrow
0.25
μ
V typ. at 12 dB SINAD
Wide/Middle/Narrow
–10 dB
μ
max. at 12 dB SINAD
Digital
0.25
μ
V typ. at 5% BER
Digital
0 dB
μ
V emf max. at 1% BER (PN9)
• Squelch sensitivity
(at threshold)
Wide/Narrow
0.25
μ
V typ.
Wide/Middle/Narrow
0.25
μ
V typ.
• Adjacent channel selectivity Wide 78 dB typ. Wide 70 dB min.
– Middle 70 dB min.
Narrow 56 dB typ. Narrow 60 dB min.
Digital 63 dB typ. Digital 45 dB min.
• Spurious response Wide/Narrow 70 dB Wide/Middle/Narrow 70 dB min.
Digital 65 dBµV emf Digital 70 dBµ Vemf min.
• Intermodulation Wide 70 dB min.
– Middle 70 dB min.
Narrow 70 dB min.
Digital 71 dBµV emf min.
• Hum and noise Wide 50 dB typ. Wide 45 dB min.
– Middle 43 dB min.
Narrow 45 dB typ. Narrow 40 dB min.
Digital 55 dB typ. Digital 55 dB min.
• Audio output power
(at 5% distortion with a 4
Ω
load)
4.0 W typ. 3.5 W min.
• Audio output impedance 4
Ω
Specifications are measured in accordance with TIA–603–B (for Wide and Narrow) or EN 300 166 (Digital) for FR6000.
Specifications are measured in accordance with EN 300 086 (for Wide, Middle and Narrow) or EN 300 166 (Digital) for FR6100.
All stated specifications are subject to change without notice or obligation.
2 - 1
SECTION 2 INSIDE VIEWS
RX VCOs
• MAIN UNIT
(TOP VIEW)
• MAIN UNIT
(BOTTOM VIEW)
Power SW (VCC line)
(Q57)
8V regulator (8V line)
(IC27)
AF AMP
(IC34)
FUNCTION
(Ref.No.)
2nd IF filter (Wide)
(FI1)
2nd IF filter (Narrow)
(FI2)
CPU
(IC20)
5V regulator (DSP5V line)
(IC39)
CPU clock
(X5)
FUNCTION
(Ref.No.)
PLL IC (TX lopp)
(IC3)
TX VCOs
Optional digital unit slot
TX power AMP
(IC22)
1st mixer (DBM)
(D62, L27, 32)
5V regulator (CPU5V)
(IC30)
5V regulator (+5V line)
(Q41)
EEPROM
(IC21)
DSP
(IC12)
AF SW
(IC35)
PLL IC (RX loop)
(IC4)
Ref. OSC
(X1)
8V regulator (T8V line)
(Q45)
Discriminator
(X3)
IF IC
(IC5)
FUNCTION
(IC40)
Liner codec
(IC8)
2 - 2
• FRONT UNIT
FRONT CPU
(IC503)
CLOCK OSC
(X501)
LCD DRIVER
(IC500)
ANALOG SW
(IC506)
AF POWER AMP.
(IC509)
SPEAKER SW
(Q508)
3 - 1
SECTION 3 DISASSEMBLY INSTRUCTION
1. Removing the front panel
q Unscrew 11 screws from the top cover.
3. Removing the MAIN UNIT
q Unscrew 9 screws, and remove the cover.
(If you are going to install an optional unit, see page 4-1 for the installation.)
2. Removing the MAIN UNIT assembly
q Uscrew 5 screws which settles the MAIN UNIT assembly.
P
0
P
1
P
2
P
3
P
4
P
0
P
1
P
2
P
3
P
4
P
0
P
1
P
2
P
3
P
4
PWR TX RX
PWR
TX RX
PWR TX RX
w Unscrew 7 screws from the front panel.
e Disconnect the cable from the MAIN UNIT assembly, and remove the front panel.
w Turn the MAIN UNIT assembly upside down.
(To be continued to next page)
3 - 2
MAIN
MAIN
J9
J9
J9
J4
J4
Unscrew
ANT case
Unsolder
ANT case
Flat cable
Disconnect
Disconnect
Black
Black
Black
Black
Red
Red
Red
Red
W4
W4
Unsolder 2 points
Unsolder 4 points
Unscrew
Clip
15 screws
w Unsolder 2 points at the ANT cases.
e Unscrew 4 screws from the ANT cases,
and remove them.
r Disconnect the flat cabe from J4 and the
speaker cable from J9.
t Unsolder 2 points at the bottom of ANT connectors.
y Unsolder 4 points at the PA module leads.
u Unscrew 2 screws from W4.
i Remove the clip from the side of chassis.
o Unscrew 15 screws from the MAIN UNIT, then take off
the MAIN UNIT PCB from the chassis.
4 - 1
SECTION 4 OPTIONAL UNIT INSTALLATION
PWR TX RX
q Disassembly the repeater until the MAIN UNIT is exposed. (See the page 3-1)
w Modify the patterns on the MAIN UNIT as below.
e Remove the protective paper of optional unit, and install it to the J1 as below.
A and F; Cut the pattern
B; Short the pattern
r Replace the cover, screws, etc. to recover the whole assembly.
NOTE: When uninstalling the scrambler unit
Be sure to recover the disconnected or connected points, otherwise no TX modulation or AF output is available.
Install UT-109R or UT-110R as follows.
<MAIN UNIT (bottom side)>
5 - 1
SECTION 5 CIRCUIT DESCRIPTION
5-1 TRANSMITTER CIRCUITS
TX PLL CIRCUIT
TX PLL IC (IC3) outputs resulting signal of phase-
comparison of REF signal (15.3 MHz) and feedback OSC
signal from TX VCO. The phase-difference signal is passed
through the active loop fi lter (Q4, 10, 13)and applied to the
TX VCO. The voltage of TX LV is adjusted to appropr iate
one. The OSC signal of TX VCO is FM-modulated by applied
modulation signals.
TX VCO CIRCUITS
There are 2 VCOs; VCO for band LOW (Q23, D10, 14, L19)
and band HIGH (Q22, D9, 13, L18), and these VCO (=OSC
freq.) are switched by the VCO SW (Q27, 28). The OSC
frequencies of these VCO are adjusted (=Locked) by the TX
LV signal (Lock Voltage). The modulation signals applied to
the Var iable Capacitor (VD; D17 or D18) vary the capacitor
reactance of it for FM modulation. The output signals of
these VCOs are applied to the power AMP circuits via
buffers (Q24, 35).
A portion of these output signals are passed through the
doubler (Q33) to extract 2nd harmonics, then applied to the
PLL IC (IC3) via the LPF.
YGR/PA CIRCUITS
The output signals from TX VCOs are amplifi ed by pre-AMPs
(Q37, 38), the amplified the PA module (IC22) to obtain
required TX power. The power-amplified TX signals are
passed through the ANT SW (D44) and LPF (for harmonics
removal) then applied to the TX ANT.
APC CIRCUIT
D45, D48 and D49 detect the TX power and the detected
voltage are applied to the IC23 of APC circuit. Comparing
the detected voltage (in proportion to TX power) and power
setting voltage (as a reference voltage), IC23 adjusts the
bias (pin 2: VGG) of PA module to control the TX power.
MODULATION CIRCUITS
The audio signals from the Microphone (MIC signals) are
applied to the MIC AMP (IC25). The amplifi ed MIC signals
are passed through the SW IC (IC35) which signal selects
the source of MIC signals from J5 (from MIC) and from
D-SUB connector (DEXM).
The MIC signals from the SW IC are amplifi ed by an AMP
(IC1) then applied to the LINEAR CODEC IC (IC8) where
the MIC signals are converted in to the digital signals. The
converted digital signals are processed (pre-emphasis,
limit, etc.) by the DSP (IC12), then recovered to the analog
audio signals. The AF signals are amplifi ed by IC1 and level-
adjusted by Ele.VR (IC2), then applied to the TX VCO and
TCXO (X1) as the modulation signals.
SIGNALING (ENCODE)
The Continious Tone (CTCSS/DTCS), Single Tone (5-Tone/
DTMF/CW_ID) signals are encoded in the DSP (IC12), and
mixed with MIC signals, level-adjusted by Ele. VR (IC2), then
applied to the TX VCO and TCXO (X1) for modulation.
5-2 RECEIVER CIRCUITS
RX PLL CIRCUIT
The RX PLL IC (IC4) outputs resulting signal of phase-
comparison of REF signal from the TCXO (X2: 15.3 MHz)
and feedback OSC signal from RX VCO. The phase-
difference signal is passed through the active loop fi lter (Q6,
11, 14) and applied to the RX VCO. The voltage of RX LV (lock
voltage) is adjusted to appropriate one by “RX LVA” signal.
A portion of reference frequency signal from the TCXO (X2:
15.3 MHz) is passed through the tripler (Q2) to extract 3rd
harmonics, then applied to theIF IC (IC5).
RX VCO
There are 2 VCOs; VCO for band LOW (Q21, D8, 16, L21)
and band HIGH (Q20, D7, 15, L20), and these VCO (=OSC
freq.) are switched by the VCO SW (Q26, 30). The OSC
frequencies of these VCO are adjusted (=Locked) by the RX
LV signal (Lock Voltage). The output signals of these VCOs
are applied to the 1st mixer (L27, 32, D62) via buffers (Q25,
34) and LO AMP (Q65).
A portion of these output signals are passed through the
buffer (Q25) doubler (Q32) to extract 2nd harmonics, then
applied to the PLL IC (IC4) via the LPF.
RF BPF CIRCUITS
RX signals from the RX ANT connector (J11) are passed
through the 1st stage of BPF (D28, 29, 31, 32, L44, 47)
then amplified by the RF AMP (Q36). The amplified RX
signals are passed through the 2nd stage of BPF to remove
unwanted signals for good image response then applied to
the 1st mixer (L27, 32, D62).
Being mixed with 1st LO from the RX VCO, the RX signals
are converted into the 46.35 MHz 1st IF signal. The 1st and
2nd stage of the BPF are tune to the pass band frequency
by applying the tracking voltage “T1” and “T2” from the DAC
(IC17). The gain of low noise RF AMP (Q36) is controlled
by the AGC circuit (Q39, D27) according to the RX signal
strength.
5 - 2
IF FILTER/IF AMP CIRCUITS
The 1st IF signal from the 1st mixer (L27, 32, D62) is
amplified by the post AMP (Q63, 64) and 1st stage of IF
AMP (Q7) then fi ltered by crystal fi lter (FI3 or FI4), and then
applied to the IF IC (IC5).
The crystal fi lters (FI3 or FI4) are switched by the “NWC
１
”
signal from the CPU (IC20) according to the RX mode; Wide
(Middle), Narrow and Digital.
<ANALOG RX>
Being mixed with the 2nd LO, the 1st IF signal is converted
into the 450 kHz 2nd IF signal then detected by the internal
quadrature detector (X3 as a discriminator) to demodulate.
The demodulated AF signals are amplifi ed by the AF AMP
(IC36), and applied to the LINER CODEC (IC8). The AF
signals are converted into the digital signal then processed
by the DSP (IC12) then recovered to the analog audio
signals.
The ceramic fi lters (FI1 or FI2) are switched by the “NWC2”
signal from the CPU (IC20) according to the RX mode; Wide
(Middle), Narrow and Digital.
<DIGITAL RX>
The 450 kHz 2nd IF signal is amplifi ed by IC7 then applied
to the DSP (IC12) via ADC (IC9) and digital demodulated.
The processed digital signal is converted into the analog
audio signal by the LINEAR CODEC (IC8).
AF AMPLIFIER CIRCUITS
The AF signals from the LINEAR CODEC are amplifi ed by
the AF AMP (IC36) and level-adjusted by DAC (IC2), then
applied to IC28 via IC29 to be power-amplifi ed.
SIGNALING (DECODE)
The Continious Tone (CTCSS/DTCS), Single Tone (5-Tone/
DTMF/CW_ID) signals in the demodulated AF signals are
decoded in the DSP (IC8).
5-3 OTHER CIRCUITS
POWER SUPPLY
The power supply is switched by Q57 (ON/OFF). 5V (REF5)
from the regulator (IC30) is passed through L58 to supply to
CPU. The 5V also supplies to other sections of the repeater
via Q41 as “+5V.”
8V from the regulator (IC27) are supplies to various circuits,
and also supplies to TX circuits as “T8V” and RX circuits as
“8V.”
5V from the regulator (IC39) supplies DSP as “DSP5” and
supplies logic circuits; CPU, DSP, etc. via regulators (IC13,
14, 15).
The regulator “F8V” (IC41) provides the supply for FRONT
UNIT.
COMPANDER
The compander in the DSP (IC12) compresses the
amplitude of MIC signals in TX, and expands in RX to
provide high quality recovered sounds.
LED
DS1 (BUSY), DS2(PWR) and DS3 (TX) indicate the
repeater’s status: Power ON, T/RX and Cloning.
5 - 3
Pin
No.
LINE NAME DESCRIPTION
IN/
OUT
CONDITION
140–144 D0–D4 DSP data bus line. I/O –
1–11 D5–D15 DSP data bus line. I/O –
15–28 A1–A14 DSP data bus line. I/O –
29 HRW DSP data line. I/O –
32 FANS Cooling fan (CH: MF1) rotation detect. I "H"=While the cooling fan is rotating.
33 TLED TX indicator LED control signal. O "H"=TX
34 LEDR RX indicator LED control signal. O "H"=Squelch open.
35 PLSCK PLL (M: IC4) serial clock. O –
36 PLSSO PLL (M:IC4) serial data. O –
41 PWON Power line "VCC" control signal. O "H"=Power ON.
42 AFON2 AF power AMP. (M: IC28) control signal. O "H"=AF power AMP ON.
43 AFON AF output select signal. O
"H= AF signals are output from the
[ACCESSORY CONNECTOR].
44 ESCL Serial clock to the EEPROM (M: IC21). O –
45 ESDA Serial data to the EEPROM (M: IC21). O –
46 TXC TX power line "T8V" control signal. O "H"=TX
47 RXC RX power line "R8V" control signal. O "H"=RX
48 RPLST RX PLL (M: IC4) strobe. O –
49 TPLST TX PLL (M: IC3) strobe. O –
50 RUNLK RX PLL (M: IC4) unlock signal. I "L"=Unlocked
51 TUNLK TX PLL (M: IC3) unlock signal. I "L"=Unlocked
52 XCTS Serial data from the RS-232 line driver (M: IC26). I –
53 XRTS Serial data to the RS-232 line driver (M: IC26). O –
55 EXDA External D/A port. O –
56 BEEP Beep sounds (square waves). O –
57–59 OPV3–OPV1 Optional unit detect. I –
60 MMUT MIC mute signal to the installed optional unit. O "H"=MIC mute
61 HANG Microphone hang-up detect. I "L"=Hang-up
62 PTT [PTT] key input. (pull up) I –
63 RMUT RX mute signal to the installed optional unit. O "H"=RX mute
64 EXAD External A/D port. I –
65 TEMP Temperature detect. I –
68 RLVIN RX PLL lock voltage. I –
69 BATV Voltage monitor (divided voltage of "VCC"). I –
70 TLVIN TX PLL lock voltage. I –
71 RSSI RSSI signal from the IF IC (M: 5). I –
74 XTXD External data to the RS-232 driver (M: IC26). O –
75 XRXD External data from the RS-232 driver (M: IC26). I –
76 TMUT TX mute signal. O "H"=TX mute
77 HINT DSP IC control signal. O –
78 INT1 DSP IC control signal. O –
79 HRDY DSP IC control signal. O –
81 HDS1 DSP IC control signal. O –
82 HDS2 DSP IC control signal. O –
100 RES CPU reset signal from the reset IC (F: IC501). O –
101–108 EXIO1–EXIO8 External data bus line. I/O +5 V pull-up
112 POSW [PWR] key input. (pull-up) I –
113 NOIS Noise detect. I "H"=RX signal is absent (squelch close).
114 CSFT Clock frequency shift signal. O –
119 SSO Serial data to the seri-para converter (M: IC31). O –
120 SCK Clock signal to the seri-para converter (M: IC31). O –
121 EXIO9 External data bus line. I/O +5 V pull-up
122 DSDA Serial data to the DAC (M: IC17). O –
5-4 CPU (M: IC20) PORT ALLOCATION
5 - 4
Pin
No.
LINE NAME DESCRIPTION
IN/
OUT
CONDITION
123 DAST Strobe to the DAC (M: IC2). O –
125 FMDA Data from the FRONT CPU (F: IC502). I –
126 MFDA Data to the FRONT CPU (F: IC502). O –
127 OPT2 Port for optional unit. O –
128 OPT1 Port for optional unit. I –
129 OPT3 Port for optional unit. I –
131 CSO Port for optional unit. O –
132 CSI Port for optional unit. I –
133 EXOE Output enable signal to the seri-para converter (M: IC31). O –
134 EXST Strobe to the seri-para converter (M: IC31). O –
135 DRES Reset signal to the DSP IC (M: IC12). O –
136 HCS DSP data line. I/O –
138 GPIO2 DSP data line. I/O –
139 GPIO1 DSP data line. I/O –
3-4 CPU (M: IC20) PORT ALLOCATION (continued)
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