Midland 442XL Service Manual Download Page 2

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Summary of Contents for 442XL

Page 1: ...VHF WIDE BAND SERVICE MANUAL LAND MOBILE RADIO bUVUUU 1690 North Topping Avenue Kansas City Missouri 64120 MANUAL NO 70 342442 09 342 442 XL SM 8 86 1 5M ...

Page 2: ...n g p a t t e r n s a n d r e s p e c t i v e o t h e r s i d e c o m p o n e n t m a p s Any d o u b l e i m a g e l a y o u t o f t h e t h r e e PC b o a r d s c a n b e v i e w e d w i t h t h e i r r e s p e c t i v e s c h e m a t i c w i t h o u t t u r n i n g p a g e s I n f o r m a t i o n i n t h i s b o o k i s f o c u s e d o n t h e b a s i c t r a n s c e i v e r B e c a u s e o f t...

Page 3: ...iguration 24 Trunk Mount Configuration 25 Under Dash Power Accessory Plug 26 Trunk Mount Power and Accessory Plugs 28 Automotive Receiver Interference 31 Optional Accessories 35 Service Equipment 37 Service Tools 38 Optional Feature Add on Kits 39 SERVICING Troubleshooting Charts General 45 CPU Phase Lock Loop 46 Transmitter 47 Modulator 47 Receiver 48 Component Replacement Chip Component Identifi...

Page 4: ...Trunk Mount C i r c u i t r y Trunk Mount I n t e r c o n n e c t D i a g r a m 8 4 C o n t r o l Head 85 C o n t r o l C a b l e I n t e r f a c e B o a r d 8 6 DC V o l t a g e s R e c e i v e r B o a r d 8 7 70 442XL R e c e i v e r B o a r d S c h e m a t i c D i a g r a m 8 7 T r a n s m i t t e r B o a r d DC V o l t a g e s T r a n s m i t t e r B o a r d 88 M i c r o p r o c e s s o r P i ...

Page 5: ...s E l e c t r o n i c t u n i n g o f c r i t i c a l s t a g e s i s u s e d t o a l l o w t h e m t o o p e r a t e o v e r a 2 4 MHz s p r e a d o f c h a n n e l f r e q u e n c i e s T h e XL m o d e l s a r e r e v i s e d 7 0 3 4 2 a n d 70 442 t r a n s c e i v e r s t h a t u s e d 5 KHz f o r t h e i r m a i n VCO c o m p a r a t o r f r e q u e n c y T h e 70 342XL a n d 70 442XL m o d ...

Page 6: ...D STABILITY 5 ppm b o t h TX a n d R X s t a n d a r d 2 5 ppm o p t i o n a l 2 0 p p m o p t i o n a l DUTY CYCLE I n t e r m i t t e n t 1 min TX 4 min R X P e r EIA RS 152B H I G H HUMIDITY 9 5 a t 50 C p e r EIA RS 152B s e c 1 3 VIBRATION STABILITY P e r EIA RS 152B sec 1 4 SHOCK STABILITY P e r EIA RS 152B sec 15 CURRENT D R A I N S t a n d b y 0 3 5 a m p e r e DC max R e c e i v e 1 0 0 a...

Page 7: ... peak clipping with low pass audio filtering HUM AND NOISE 50 dB OCCUPIED BANDWIDTH Less than 60 dB of carrier power 30 KHz outside carrier frequency TRANSMIT CARRIER ATTACK TIME 100 ms max for 50 rated power CONDUCTED SPURIOUS EMISSIONS Less than 25 uW from 1 to 1000 MHz MICROPHONE INPUT LEVEL 8 dBm 3 dB at 600 ohms OUTPUT PROTECTION Shall withstand withcut damage 5 minutes of operation into a 20...

Page 8: ... minimum ADJACENT CHANNEL REJECTION 80 dB at 30 KHz SPURIOUS RESPONSE IMMUNITY 85 dB INTERMODULATION IMMUNITY 75 dB AUDIO POWER OUTPUT Under Dash Radio 70 342XL 1 watt at 5 THD into its internal speaker or 5 watts 5 THD into a 3 2 ohm external speaker Trunk Mount Radio 70 442XL 5 watts at 5 THD into the 3 2 ohm external speaker AUDIO FREQUENCY RESPONSE Per EIA and DOC specifications HUM AND NOISE ...

Page 9: ...TY CHANNEL SAMPLING RATE E v e r y 4 o r 8 c h a n n e l s o r e v e r y 1 o r 2 s e c o n d s d u r i n g s c a n h o l d SIGNAL DETECTION o f c a r r i e r p r e s e n c e o r v a c a n c y o r o f c o r r e c t CTCSS t o n e p r e s e n c e o r v a c a n c y w i t h c a r r i e r SCAN RESUME DELAY 0 3 2 5 o r 5 s e c o n d s o r l o c k h o l d u n t i l r e s e t SCAN SPEED w i t h s t a n d a...

Page 10: ......

Page 11: ...ty receive channel frequencies 2 All standard CTCSS tones for each TX and RX channel requires installation of the CTCSS module within the transceiver 3 Time out timer time maximum continuous transmission duration 4 Scan parameters a s follows a Two scan groups each containing up to sixty four channels b A variety of priority scan channel revert arrangements utilizing the two channel lists c Either...

Page 12: ... If the Continuous Digital Coded Squelch System option is installed in the transceiver the ElPROM Module is different This Module MIDLAND number 70 2402 is larger in size to accommodate an additional recep tacle for connection to the CDCSS board When programming the ElPROM type selection entered into the Programmer is the same as for the standard EIPROM ElPROM MODULE REMOVAL The E PROM module is a...

Page 13: ...SOHll o r PASSIHll T h e l a s t t w o d i g i t s i n d i c a t e t h e r e q u i r e d s o f t w a r e r e v i s i o n l e v e l H 1 o r L 3 i s i n s t a l l e d i n t h e p r o g r a m m e r A f t e r t w o s e c o n d s TYP s h o u l d a p p e a r i n t h e BAND d i s p l a y I f a n e a r l i e r v e r s i o n s o f t w a r e i s i n s t a l l e d s e e H 1 VERSION UPGRADE p r e c e d i n g ...

Page 14: ... t i o n i s i n s t a l l e d i n t h e t r a n s c e i v e r t h e CTCSS t o n e f r e q u e n c y o r CDCSS c o d e c a n b e e n t e r e d a s d e s c r i b e d b e l o w CTCSS Key i n t h e d e s i r e d CTCSS t o n e f r e q u e n c y t o b e d e c o d e d i n c l u d i n g t h e d e c i m a l p o i n t o n l y s t a n d a r d EIA f r e q u e n c i e s a r e v a l i d T h e d i g i t s w i l...

Page 15: ... l i s t w i t h t h e a p p r o p r i a t e a r r o w p u s h b u t t o n Whenever t h e l i s t i s l o o p e d b a c k w a r d s f r o m c h a n n e l 0 t o c h a n n e l 7 9 t h e C e n t e r F r e q u e n c y c h a n n e l i s a c c e s s e d a n d CF a p p e a r s i n t h e CHANNEL d i s p l a y S t o p o n t h e CF c h a n n e l 1 2 STEP 1 w i l l a l s o a p p e a r s h o w i n g r e a d i...

Page 16: ...a p p e a r i n t h e STEP d i s p l a y a n d t h e l o w e s t B l i s t s c a n s e q u e n c e d e s i g n a t o r 0 s h o u l d a p p e a r i n t h e BAND d i s p l a y E n t e r B s c a n l i s t c h a n n e l s i n t h e same m a n n e r a s A l i s t e n t r y A g a i n t h e h i g h e s t l i s t s e q u e n c e d e s i g n a t o r i s 63 2C P r e s s RESET t o e x i t t h e s c a n p r o...

Page 17: ...p to Function Code 7 Function Codes 3 through 6 will automatically be programmed with their default values If a special application requires altering scan timing refer to the Programmer Operator s Manual for procedure 24 Priority Monitoring F n C 1 and 7 should be displayed Entering a value in this mode either disables priority channel see erato tor s manual sampling or changes its rate If this fu...

Page 18: ... r CDCSS c o d e 2 NORMAL S c a n Mode w i t h s c a n s t o p p e d by a b s e n c e o f c a r r i e r 3 NORMAL S c a n Mode w i t h s c a n s t o p p e d by p r e s e n c e o f c a r r i e r w i t h o u t c o r r e c t CTCSS t o n e o r CDCSS c o d e 4 MODIFIED S c a n Mode w i t h s c a n s t o p p e d b y c a r r i e r p r e s e n c e 5 MODIFIED S c a n Mode w i t h s c a n s t o p p e d by p ...

Page 19: ... i s s i o n o n a b u s y c h a n n e l a n d c a n p r o v i d e a n a u d i b l e a l e r t when a n a t t e m p t i s m a d e T h e s t a n d a r d t r a n s c e i v e r i s c o n f i g u r e d f o r BCLO by c a r r i e r d e t e c t i o n when e n a b l e d by p r o g r a m m i n g T h e r e f o r e i f n e i t h e r CTCSS n o r CDCSS a r e u s e d n o j u m p e r s c h a n g e i s n e c e s ...

Page 20: ... 8 VDC 10 amps Power Mate BPA 20PF Wattmeter 50 watts 136 174 MHz Bird model 43 with 50C element and 50 ohm load Deviation Meter 136 174 MHz 5KHz range p o Cushman CE 31A Frequency Meter or 136 174 MHz p o Cushman CE 31A or Frequency Counter 2 0 ppm accuracy Heath SM 4120 Audio Generator 0 10 KHz sine wave Heath SG 5218 0 5 Vrms output CALIBRATION SET UP POWER SUPPLY ...

Page 21: ...e n r e p l a c e d R e a l i g n m e n t r e q u i r e s t r a n s c e i v e r o p e r a t i o n o n s p e c i a l f r e q u e n c i e s t h e r e f o r e t h e y m u s t b e p r o g r a m m e d i n t o t h e t r a n s c e i v e r E PROM s p e c i f i c a l l y f o r a l i g n m e n t T h e c o m p l e t e A l i g n m e n t p r o c e d u r e c a n b e f o u n d i n t h e SERVICING SECTION o f t h...

Page 22: ...eadjust applied signal level for 2 5 KHz carrier deviation 50 modulation Adjust LlOl and L102 for maximum deviation 5 If the transceiver is not equipped with a CTCSS option skip this step Select any channel that is programmed for a CTCSS tone Remove the modulating signal and key the transmitter While monitoring carrier modulation adjust the TONE OUTPUT LEVEL adjustment RV1 on the 70 2101 or 70 210...

Page 23: ...TRANSCEIVER CALIBRATION 7 0 3 4 2 4 4 2 TRANSMITTER AND SYNTHESIZER ADJUSTMENTS TRANSMITTER BOARD RF POWER AMPLIFIER BOARD ...

Page 24: ...c o n n e c t s t h e c o n t r o l h e a d t o t h e t r u n k u n i t i s f o u r m e t e r s l o n g a n d f l a t f o r l a y i n g u n d e r c a r p e t i n g T h e c a b l e m u s t n o t l a y n e a r h o t a r e a s a b o v e t h e c a t a l y t i c c o n v e r t e r f o r e x a m p l e n o r a g a i n s t s h a r p e d g e s A t r u n k u n i t m o u n t i n g t r a y i s p r o v i d e d ...

Page 25: ...SCEIVER I N A POSITIVE GROUND VEHICLE I f t h e t r a n s c e i v e r i s u s e d a s a b a s e s t a t i o n t h e e x t e r n a l AC line to DC p o w e r s u p p l y m u s t b e a d e q u a t e l y r e g u l a t e d a n d h a v e s u f f i c i e n t c u r r e n t c a p a c i t y ANTENNA T h e m o s t i m p o r t a n t c o m m u n i c a t i o n s s y s t e m c o m p o n e n t t h a t c a n a f f ...

Page 26: ...er Dash Mounting Bracket C Dynamic Hand Microphone D Power Accessory Plug and Cable 2m E Microphone Hang up Clip with screws Spare Fuse 10A Mounting Hardware Kit OPTIONAL ACCESSORIES also see ACCESSORIES F External Speaker 5 watt G Microphone Hang up Box with switch MODEL NUMBER PART NUMBER section 70 2353 70 2195 ...

Page 27: ...1 D A c c e s s o r y P l u g 7 0 2 2 2 2 E C o n t r o l H e a d M o u n t i n g B r a c k e t F M i c r o p h o n e Hang up C l i p w i t h screws G S p e a k e r 5 watt 7 0 2 3 5 3 I T r u n k M o u n t i n g T r a y w i t h k e y s 7 0 2 2 0 5 I Power P l u g a n d C a l d e 6m 7 0 2 2 1 2 S p a r e F u s e L O A Mounr i n g H a r d w a r e K i t OPTIONAL ACCESSORY a l s o s e e ACCESSORIES s ...

Page 28: ...re used for connection of optional devices not included with this assembly Optional devices can be connected to the Power Accessory Plug by inserting Molex pins included with these devices into respective vacant holes Optional connections below are shown in lighter shade Refer to the ACCESSORIES section of this manual for pin socket connector body and tool part numbers MUM 1 TONE MON 0 I TONS OPTZ...

Page 29: ... n e c t i o n i s u s u a l l y a v a i l a b l e i n t h e v e h i c l e f u s e b l o c k i f t h e r e d t r a n s c e i v e r w i r e i s t e r m i n a t e d w i t h a n a p p r o p r i a t e l u g UNDER DASH OPTIONAL CONNECTIONS EXTERNAL SPEAKER M o d e l s 7 0 2 3 5 2 a n d 7 0 2 3 5 3 N o r m a l l y t h e t r a n s c e i v e r i n t e r n a l s p e a k e r i s c o n n e c t e d t o re c e...

Page 30: ...s p e a k e r h a s M o l e x p i n s t h a t i n s e r t i n t o t h i s p l u g E x t r a p i n p o s i t i o n s a r e p r e s e n t f o r c o n n e c t i o n o f t h e o p t i o n a l 70 2195 s w i t c h i n g h a n g u p box n o t i n c l u d e d w i t h t h e s t a n d a r d t r a n s c e i v e r f o r u s e w i t h CTCSS o r CDCSS Two m o r e p i n p o s i t i o n s a r e p r o v i d e d f ...

Page 31: ... k i f t h e r e d t r a n s c e i v e r w i r e i s t e r m i n a t e d w i t h a n a p p r o p r i a t e l u g CONTROL HEAD ACCESSORY PLUG CONNECTIONS STANDARD EXTERNAL SPEAKER M o d e l 7 0 2 3 5 3 T h e t w o w i r e s o f 70 2353 s p e a k e r a r e t e r m i n a t e d w i t h Molex p i n s f o r i n s e r t i o n i n t o p o s i t i o n s 4 a n d 6 o f t h e A c c e s s o r y P l u g t h a t...

Page 32: ......

Page 33: ...t r y i n d u c t i v e i n t e r f e r e n c e i m i t a t e s r e c e i v e r I F f r e q u e n c i e s o r e v e n c h a n n e l f r e q u e n c i e s a n d i s d e m o d u l a t e d by t h e r e c e i v e r I n d u c t i v e i n t e r f e r e n c e i s a n e l e c t r o m a g n e t i c f i e l d t h a t i n d u c e s n o i s e c u r r e n t s i n t h e t r a n s c e i v e r a n t e n n a a c c...

Page 34: ... o u r c e s s p a r k s a n d h i g h f r e q u e n c y o s c i l l a t o r s M o d e r n v e h i c l e s u t i l i z e many e l e c t r o n i c g a d g e t s a n d s y s t e m s t h a t may p r o d u c e a h a s h o r w h i n e i n t h e t r a n s c e i v e r O s c i l l a t o r s w i t h i n t h e s e d e v i c e s t h a t s o m e t i m e s a r e p o o r l y s h i e l d e d may r a d i a t e a ...

Page 35: ...IATING CHOKE KILLS ANTENNA EFFECT ELECTRICAL WIRING TO DEVICE NOISE VOLTAGE ACROSS Rw IS CONDUCTED DIRECTLY INTO TRANSCEIVER IGNITION VOLTAGE PRODUCED BY HIGH CURRENT SURGES THROUGH Rw ALTERNATOR WITH BAD INTERNAL DIODE 12 VOLTS H ICH CURRENT SllRCES ARE SMOOTHED BY BATTERY CAPACITY HIGY CURRENT SURGES CAIJSED BY DEFECTIVE ALTERNATOR FIGURE 1 CONDUCTIVE AND INDUCTIVE INTERFERENCE ...

Page 36: ... i o n t o t h e s p a r k p l u g w i r e s C h e c k t h e i g n i t i o n c o i l i t s h i g h v o l t a g e w i r e a n d d i s t r i b u t o r c a p f o r s i g n s o f a r c i n g t h r o u g h c r a c k s a n d b u r n s o r o v e r d i r t I f t h e i n t e r f e r e n c e p r o d u c e s a p o p p i n g s o u n d i n t h e t r a n s c e i v e r a t e n g i n e i d l e t h a t s e e m s t...

Page 37: ...2XL A c c e s s o r y P l u g I t s 5 5 f t f u s e d power l e a d s m u s t b e c o n n e c t e d t o v e h i c l e a n d g r o u n d ALL WEATHER SPEAKER Model No 70 SO5 A 5 w a t t 4 ohm o u t d o o r s p e a k e r t h a t c a n b e m o u n t e d i n a v e h i c l e g r i l l I t s 8 f t c a b l e i s t e r m i n a t e d w i t h a p p r o p r i a t e Molex p i n s f o r i n s e r t i o n i n t ...

Page 38: ...a t e SYN TECH s i d e r a i l s a n d h a r d w a r e f o r m o u n t i n g t h e 70 442XL t r u n k m o u n t u n i t w i t h t h e S l i d e m o u n t c o n f i g u r a t i o n TRUNK MOUNTING TRAY CONVERSION KIT Model No 70 2256 T h e 7 0 2 2 0 5 Trunk Mount B r a c k e t w i t h a p p r o p r i a t e SYN TECH s i d g r a i l s a n d h a r d w a r e f o r m o u n t i n g t h e SYN TECH u n d e ...

Page 39: ...t r o n i c i n f o r m a t i o n u n t i l e x p o s e d t o h i g h i n t e n s i t y u l t r a v i o l e t l i g h t T h e E PROM E r a s e r h a s a d r a w e r l a r g e e n o u g h f o r p o s i t i o n i n g e i g h t m o d u l e s u n d e r i t s u l t r a v i o l e t l a m p a n d a timer f o r a u t o m a t i c s h u t o f f T h e 70 1100 E r a s e r o p e r a t e s f r o m a 1 1 0 V o l...

Page 40: ...HAND PRESS P N 7 0 2 2 2 9 P l i e r l i k e h a n d t o o l w i t h a s p e c i a l j a w t o p r e s s c o m p r e s s i o n f i t r i b b o n c a b l e c o n n e c t o r s o n t o r i b b o n c a b l e e n d s A p p l i c a b l e u s e F i t t i n g 34 p i n SYN TECH C o n t r o l C a b l e c o n n e c t o r a s s e m b l i e s M o d e l No 7 0 2 2 2 8 o n t o f l a t r i b b o n c a b l e c u ...

Page 41: ... o n t a i n e d i n t h e t r a n s c e i v e r E PROM t h u s f r e q u e n c i e s c a n b e d i f f e r e n t f o r e a c h c h a n n e l a n d e a c h mode TX RX T h e o p t i o n a l 7 0 2 1 9 5 M i c r o p h o n e Hang up Box a m o b i l e a c c e s s o r y i t e m c a n b e i n s t a l l e d t o a c t i v a t e c h a n n e l m o n i t o r a u t o m a t i c a l l y T h e 7 0 2 1 0 2 8 E n c...

Page 42: ... b l e o n l y w i t h u n d e r d a s h t r a n s c e i v e r s I f i n s t a l l e d i n a t r a n s c e i v e r e q u i p p e d w i t h t h e s c a n f e a t u r e t h e 7 0 2 1 9 5 M i c r o p h o n e Hang up Box i s r e q u i r e d T h e d e c o d e r m o u n t s i n s i d e t h e t r a n s c e i v e r T h e t r a n s c e i v e r f r o n t p a n e l m u s t b e a l t e r e d a n d s e v e r a...

Page 43: ...h complement The decoder PC board mounts inside the transceiver and several wires must be soldered inside both the transceiver and Control Head An on channel signal with continuous 2805 Hz tone modula tion and an AC voltmeter are necessary for alignment 2 0 or 2 5 ppm OSCILLATOR CONVERSION Model Nos 70 2124 2125 These kits contain the necessary components for replacing the transceiver master oscil...

Page 44: ... l w i t h a 21 855MHz c r y s t a l w h i c h c h a n g e s s e c o n d i n j e c t i o n f r o m s t a n d a r d l o w s i d e t o h i g h s i d e t h u s s h i f t i n g t h e s p u r i o u s r e s p o n s e f r e q u e n c i e s t h a t a r e a f u n c t i o n o f t h e s e c o n d I F i m a g e T h i s k i t i s e f f e c t i v e o n l y i f o n e o r m o r e t h e i n t e r f e r e n c e s i...

Page 45: ...n e l s a r e m a i n t a i n e d w h i l e t h e v e h i c l e i g n i t i o n i s o f f T h e f u s e d B w i r e i n c l u d e d i n t h i s k i t m u s t b e a d d e d t o t h e t r a n s c e i v e r P o w e r c c e s s o r y P l u g a n d c o n n e c t e d t o t h e v e h i c l e b a t t e r y o r a n o n s w i t c h e d c i r c u i t O t h e r c o m p o n e n t s m u s t a l s o b e a d d e ...

Page 46: ...jack and parts to replace the 4 pin microphone jack in either the under dash transceiver J393 or the trunk mount transceiver Control Head 5395 The 6 pin jack is necessary for connection with the 70 2305 Desk Microphone It is also needed for connection of the 70 2103A 70 2104A DTMF Encoding Microphones but is included with each of them Jack wiring inside the transceiver for the Desk Microphone is n...

Page 47: ...SERVICING ...

Page 48: ......

Page 49: ...t Power OK o r 94 is Displayed Module Same lndication L A Display blank o r i n c o r r e c t S u b s t i t u t e Same Indication Same Same lndication lndication N o Output Power E PROM Module Main VCO out o f lock S e e T r a n s m i t t e r Trouble shooting C h a r t Check Receiver Chcck IC303 8VDC Supply Squelch Operation OK See CPU PLL T r a n s m i t t e r Of A Troubleshooting Check IC 301 L ...

Page 50: ... 2 8 o f IC901 is Lo A t OK I O K Check the D C Amp 4704 Shooting Chart Check i f p i n 30 of IC901 goes 0705 4706 IC701 pin 11 Check IC401 1 4 0 2OK H i i n Transmit Mode Lo Transmit o r Receive Voltage Regulators Recheck IC901 input c o n t r o l p i n s N Check for p u l s e s on IC901 P i n 4 Lo Receiver i n Standby lode p i n s 10 11 22 23 23 25 P i n 6 H i Main VCO unlock from IC701 p i n 10...

Page 51: ... n 0 g D 3 1 0 rt U 0 0 l o m la n CX wl Cn 0 0 P W a P i 0 74 4 un o m I n h n5 o m r H O M P W 2 4 r t O Or n n r 0 0 0 x n A X a h U W P E k bl h 0 V 1 w W 0 KH m n r B o m e 3 rt n 0 0 d R 6 r d r m n 09 F F C m 0 VI 0 Y C V a n o m r c r t m m n W H 3 co n r n r 3 0 O P hh rt B e 0 A P 0 c Cn I I Cn a V C m n C w R R p n a n r r C tl co n e 0 b l x c I D R U CI P n D R e rn o o F 0 3 m r 3 c ...

Page 52: ...f L209 and L210 A I Weak Signal Check IC251 X251 and Squelch Distorted S l g n a l I Check IC252 Audio 1 Re Cer t o CPU PLL R e p l a c e 11 a l i g n m e n t o f L252 Output IC T r o u b l e s h o o t i n g C h a r t 4 4 0 3 Check TP752 f o r Receiver OK 0K Tracking Control Voltage 95 E r r o r Code and Adjust RV752 C OV 9V Check Q201 Q202 Q251 FL251 Check Squelch IC251 p i n s 10 11 12 13 14 Q25...

Page 53: ...hip resistors used in the SYN TECH typically are white with blue value markings Resistance in ohms can be determined from value markings as follows NUMERICAL VALUE 1 0 1 1 1 2 1 3 1 5 1 6 1 8 2 0 2 2 2 4 2 7 3 0 3 3 3 6 4 3 4 7 1st two digits significant numerals 00 to 99 3rd digit amount of following zeros NPO fi Example 125 12 00000 1 200000 ohms 1 2 megohm ALPHABET CHARACTER T U V W X Y Z a b d...

Page 54: ... A N D RESOLDERING E x t r e m e c a r e m u s t b e e x e r c i s e d when r a p l a c i n g c o m p o n e n t s w i t h l e a d s t h a t f e e d t h r o u g h a PC b o a r d T h e c o p p e r p l a t i n g o n b o t h s i d e s o f t h e p r i n t e d c i r c u i t b o a r d a n d i n s i d e c o m p o n e n t l e a d h o l e s e a s i l y s e p a r a t e s a n d t e a r s f r o m t h e PC b o ...

Page 55: ...o n e n t s b u r n e a s i l y CAUTION A p p l i c a t i o n o f t o o much s o l d e r can c r e a t e s o l d e r b r i d g e s b e t w e e n PC p a t t e r n s u n d e r t h e s o l d e r e d c o m p o n e n t a n d a r o u n d t h e p a d 1 P l a c e a s o l d e r i r o n t i p d i r e c t l y o n t h e d e f e c t i v e c o m p o n e n t t o melt t h e g l u e u n d e r t h e c o m p o n e n...

Page 56: ...a n d s h o r t t h e p a d s t o g e t h e r L e t t h e h o t s o l d e r f l o w o n t o t h e compo n e n t n e v e r t o u c h t h e c o m p o n e n t w i t h t h e i r o n R e p e a t t o f i n i s h t h e o t h e r e n d o f t h e c o m p o n e n t S o l d e r m u s t a d h e r e t o a l l metal l i c e n d s u r f a c e s o n b o t h e n d s o f c o m p o n e n t a s i n F i g u r e 6 CAUT...

Page 57: ...g section SUGGESTED TEST EQUIPMENT Test Instrument Instrument Capabilities Instrument Type DC Power Supply 13 8 VDC 10 amps Wattmeter 5 0 watts 136 174 MHz Digital Multimeter 0 1 to 20 volts DC AC Distortion Analyzer lKBz 2 range Speaker Load 3 2 ohms 10 watt RE Signal Generator 136 174 MHz range 0 1 1KuV output FM modulated Deviation Meter 136 174 MHz 5KHz range Frequency Meter or 136 174 MHz Fre...

Page 58: ...COMPLETE ALIGNMENT 7 0 3 4 2 4 4 z x TRANSMITTER AND SYNTHESIZER ALIGNMENT SET UP RECEIVER ALIGNMENT SET UP 54 ...

Page 59: ...PROGRAMMED for special test frequencies Set Up 1 Remove the 8 securing screws to remove the top and bottom covers 2 Remove the E PROM Module Replace it with another E PROM Module that has been programmed with the following channels INCLUDE THE CENTER FREQUENCIES as described in the E PROM Programming section A BAND XCVR Test Channel 1 RX 156 00 MHz Test Channel 1 TX 156 00 MHz Test Channel 2 RX 14...

Page 60: ...COMPLETE ALIGNMENT 7 0 3 4 2 4 4 2 TRANSMITTER AND SYNTHESIZER ADJUSTMENTS TRANSMITTER BOARD T P 7 0 l 0 704 702 TP762 CVlO2 7 5 1 RV7 2 o Rv751 107 E 0 TPlOl fi G RVlO2 RVIO1 ...

Page 61: ...g 9 With the transceiver set to receive Test Channel 3 adjust RX TRACKING RV752 for 1 0 volt DC on TP752 10 Select Test Channel 1 and key the transmitter Adjust TX TRACKING RV751 for 9 0 volts DC on TP751 TRANSMITTER ALIGNMENT 11 Select Test Channel 3 and key the transmitter Adjust CV102 for a minimum DC voltage on CMlOl pin 2 TX Preamplifier Collector Current 12 Align carrier frequency modulation...

Page 62: ...COMPLETE ALIGNMENT 7 0 3 4 2 4 4 2 RECEIVER ADJUSTMENTS RECEIVER BOARD ...

Page 63: ...age at CM202 pin 2 16 Apply 1 mV of modulated 1 K H z tone 3 K H z deviation on channel RF signal to the 50 ohm antenna connector Adjust DETECTOR L252 for maximum audio output 17 Apply enough modulated 1 K H z tone 3 K H z deviation on channel carrier to maintain 12 to 15 dB SINAD Adjust L208 and L251 for best SINAD 18 Apply 1 mV modulated 1 K H z tone 3 K H z deviation on channel carrier Readjust...

Page 64: ...o d e c l o s e t o t h e p r o b i n g t i p t o c o n v e r t RF s i g n a l t o DC f o r m e a s u r e m e n t w i t h a D V M S e e t h e S u g g e s t e d E q u i p m e n t L i s t f o r r e c o m m e n d a t i o n A l l a d j u s t m e n t s f o l l o w i n g m u s t b e made w i t h t h e T e s t E PROM i n s t a l l e d i n t h e t r a n s c e i v e r a n d w i t h T e s t C h a n n e l 2 ...

Page 65: ... CESSOR I C 9 0 1 PINOUTS i n t h i s s e c t i o n f o r d e t a i l s o f m i c r o p r o c e s s o r p i n s a n d f u n c t i o n s N o t e t h a t c e r t a i n p o r t i n t e r c o n n e c t s a r e b o t h a n d i n p u t a n d a n o u t p u t T h i s i s a t i m e s h a r i n g s i t u a t i o n A t o n e i n s t a n c e a l o g i c p o t e n t i a l i s a p p l i e d f r o m t r a n s c ...

Page 66: ... m i t s D2 p o r t t o I C 9 0 2 c l o c k i n p u t w h i c h c a u s e s e a c h l o a d e d b i t t o a p p e a r on I C 9 0 2 s e r i a l d a t a o u t p u t p i n 3 o n e a t a t i m e T h e e i g h t b i t s t r i n g i s a p p l i e d b a c k t o t h e m i c r o p r o c e s s o r p o r t D l c o m p l e t i n g t h e ElPROM d a t a r e a d s e q u e n c e TOP PANEL CONTROLS V a r i o u s s...

Page 67: ...on s t a t u s LO pushbutton is i n PRI push button s t a t u s LO push button is i n Strobe f o r ONE S d i g i t of CHANNEL display data Strobe f o r TEN S d i g i t of CHANNEL display d a t a A band B band jumper s t a t u s TX RX Mode c o n t r o l TX LO CPU Reset HI Reset Clock o s c i l l a t o r 800 KHz 5 Clock o s c i l l a t o r 800 KHz 5 Standby Mode HI Sleep not used Vcc 5 Volts lo LED ...

Page 68: ...a r e s w i t c h e d b a c k t o l o g i c h i g h When t h e m i c r o p r o c e s s o r i s n o t a p p l y i n g a l o g i c l o w t o i t s PLCL p o r t t h e p o r t s e r v e s a s a n i n p u t t o r e c e i v e a n o u t o f l o c k i n d i c a t i o n l o g i c l o w f r o m t h e s y n t h e s i z e r p h a s e l o c k l o o p T h e o u t o f l o c k l o g i c l o w f r o m I C 7 0 1 p ...

Page 69: ...u t p u t p i n 5 The p r e s c a l e d c o u n t i s t h e n d i v i d e d by t h e p r o g r a m m a b l e d i v i d e r w i t h i n I C 7 0 1 l e a v i n g 2 5 KHz a t o n e o f t h e t w o p h a s e f r e q u e n c y c o m p a r a t o r i n p u t s a l s o w i t h i n I C 7 0 1 T h e o t h e r c o m p a r a t o r i n p u t i s a 2 5 KHz r e f e r e n c e p r o d u c e d by d i v i s i o n o f ...

Page 70: ...4 8 MHz a b o v e r e s u l t i n g i n a c t u a l s e l e c t e d c h a n n e l f r e q u e n c y LOCK DETECT T h e r e i s a l o c k d e t e c t c i r c u i t i n e a c h PLL T h e m a i n l o c k d e t e c t c i r c u i t i s i n t e r n a l t o I C 7 0 1 a n d p r o d u c e s a c o n s t a n t l o g i c h i g h when t h e l o o p i s i n l o c k When t h e t w o c o m p a r a t o r i n p u t ...

Page 71: ... r e s e n t a t h i g h c h a n n e l f r e q u e n c i e s a n d t h e v o l t a g e f o l l o w s i n a n e a r l i n e a r f a s h i o n t h e s t e e r i n g v o l t a g e m a k e s a good t r a c k i n g v o l t a g e g u i d e DC p o t e n t i a l s a t t h e t w o I C 7 5 1 o u t p u t s i n c r e a s e w i t h i n c r e a s e i n c h a n n e l f r e q u e n c y B e c a u s e v a r a c t o...

Page 72: ...a u s e s r e s p e c t i v e v a r i a n c e s i n t h e s i g n a l p h a s e T h i s p h a s e m o d u l a t e d 1 2 8 MHz s i g n a l i s t h e n a p p l i e d t o t h e f o l l o w i n g c a s c a d e c o n n e c t e d v a r a c t o r t a n k t o s u p p l e m e n t t h e e f f e c t TRANSMIT RF PREAMPLIFIER M o d u l a t e d t r a n s m i t c a r r i e r s i g n a l f r o m t h e t r a n s m...

Page 73: ... c e s s a r y E n e r g y i s t r a n s f o r m e d a n d c o u p l e d f r o m Q502 c o l l e c t o r t o Q503 b a s e i n a s i m i l a r f a s h i o n A l l r e a c t a n c e s f r o m 4503 c o l l e c t o r c i r c u i t t h r o u g h t h e a n t e n n a s w i t c h D 5 0 1 t h r o u g h t h e h a r m o n i c f i l t e r L 5 1 1 L 5 1 4 t o t h e a n t e n n a c o n n e c t o r a r e b a l a ...

Page 74: ... i v e r p o r t 5 3 7 2 b y d i o d e s D501 a n d D503 I n t h e r e c e i v e mode b o t h d i o d e s a r e u n b i a s e d t h e r e f o r e t h e y p r e s e n t h i g h e r i m p e d a n c e t o t h e c i r c u i t R e a c t a n c e s o f L 5 1 5 C 5 2 2 C 5 2 3 a n d C 5 2 4 b a l a n c e a l l o w i n g t h e r e s i s t i v e 50 ohm r e c e i v e r l o a d a t 5 3 7 2 t o a p p e a r a t...

Page 75: ... i c i e n t t o c o m p e n s a t e f o r i n s e r t i o n l o s s t h r o u g h t h e t a n k s F o r t u n a b i l i t y a c r o s s t h e s p e c i f i e d 2 4 MHz c h a n n e l s p r e a d e a c h o f t h e f i v e p r e s e l e c t o r t a n k s a r e e l e c t r o n i c a l l y t u n e d C o n t o u r e d VCO s t e e r i n g v o l t a g e i s a p p l i e d t o v a r a c t o r d i o d e s i...

Page 76: ... 2 5 1 p i n 3 i s a p p l i e d t o t w o 4 5 5 KHz f i l t e r s EL252 a n d F L 2 5 3 t h a t p a s s o n l y t h e d o w n c o n v e r t e d c a r r i e r f r e q u e n c y a n d m o d u l a t i o n w i t h i n a 1 5 KHz window F i l t e r o u t p u t i s a p p l i e d t o t h e s e c o n d I F a m p l i f i e r a n d l i m i t e r a t I C 2 5 1 p i n 5 T h e 1 0 0 dB g a i n s e c o n d I F a...

Page 77: ...s e f l o o r s i g n a l t o t h e s q u e l c h a m p l i f i e r a t I C 2 5 1 p i n 1 0 A s t h e n o i s e f l o o r i n c r e a s e s d u e t o l e s s c a r r i e r i n p u t s o d o e s t h i s 6 0 KHz c o m p o n e n t T h e a m p l i f i e r o u t p u t a t p i n 11 d r i v e s d e t e c t o r Q252 6 0 KHz v o l t a g e s p i k e s a r e t h e n r e c t i f i e d by D252 a n d D253 t o p...

Page 78: ...g h i s a p p l i e d f r o m t h e o p t i o n a l CTCSS d e c o d e r i n v e r t e d by Q 2 6 0 when a c o r r e c t t o n e o r c o d e i s r e c e i v e d T h e CTCSS m o d u l e i s c o n n e c t e d d i r e c t l y t o t h e ElPROM M o d u l e t h r o u g h 5 9 0 3 T r a n s m i t a n d r e c e i v e CTCSS t o n e f r e q u e n c y d a t a i s p r o g r a m m e d t o t h e M o d u l e by t ...

Page 79: ... I IC 9 0 1 I I TONWMONlTOR DETECT INPUT TONE DECODE MONITOR LOW SCAN HOLD STATUS OUTPUT NOISE SQUELCH HOLD LOW I TRANSMIT INHIBIT INPUT HIGH 1NHlBIT I II 1 SQUELCH SIGNAL INPUT HIGH BUSV I TRANSMIT STATUS OUTPUT IHIGH RX L I LOW TX I Mr TONE f TONE 2 281 CTCSS R1O 5 V TONE INHIBIT I I I 5303 FRONT PANEL ...

Page 80: ... a l DC v o l t a g e a t CMlOl p i n 2 i s 0 7 V o l t s RECEIVER BOARD CM202 T h e t h r e e p i n m e t e r i n g r e c e p t a c l e CM202 i s l o c a t e d o n t h e R e c e i v e r B o a r d a t t h e e d g e a d j a c e n t t o t h e r i g h t s i d e r a i l n e x t t o A u d i o I C 2 5 2 a n d i t s h e a t s i n k CM202 p r o v i d e s t w o m e t e r i n g DC v o l t a g e s t h a t a ...

Page 81: ... I 0 C DIVIDER A M P MIX I 1 1 16 SP IC251 O 2 5 7 0 2 5 9 0402 b 2SKl25 2SXlZS r Z X 4 5 8 C 2SK117EL 2SC458C 2Sc1213C M C 3 3 5 7 AF AMP sa sw REG SW PWR SOURCE L b I t 7 0 6 1 4 0 6 9 U B P 0 4 0 3 0 RV301 INVTER 3 6 2SC458C REG SW 4 5 5 KHz m 0 2 6 0 20 945 MHZ 0709 C 8 V r 2SC458C I LC301 L r C 9 0 2 14511BP LB O R I M 0 3 0 1 14021B P GL 6N 8 8 r T S R 1 2 0 2 I C 3 0 2 CKDISPLAY 2 56MHz I 1...

Page 82: ......

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Page 84: ...GND TX LED MIC G ...

Page 85: ......

Page 86: ...RECEIVER PC BOARD 7 0 3 4 2 4 4 2 TOP VIEW BOTTOM VIEW SOLDER SIDE SEEN THROUGH PC BOARD TOP COMPONENT SIDE SEEN THROUGH PC BOARD BOTTOM Fold Out ...

Page 87: ...O I I I C 1 O F 1 I I I I I I I C n I 0 0 1 I I I N N I F I I 0 1 0 0 1 I Cn m 0 c n cn 1 0 1 O m I dl H I Z I I Z I 0 1 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 1 1 I I I I I Cn 03 cl Td i z w cn cn 0 1 0 Td r 2 w J C n V I w l m m m c o r n n o j d z m F F C n V 0 10 O n X O O X X X O n X X X X X X I l m I I I I I 1 I 1 0 1 F y y p o h y y y r r o l 1 0 1 l rI I I I I n I k r ...

Page 88: ......

Page 89: ... D N I l V l d 310N IN11 1OA l l n o I s INII A 8 I xnv z xnv 031 1113 d n o m 101 2111 031 11 ON9 119 dS0 HIS dS0 1 dS0 0 d90 d 8 301s t13HlO 3 H l NO SI NMOHS D N I l V l d 310N 301s t13HlO 3 H l NO SI NMOHS O N I l V l d 310N ...

Page 90: ...MIC OUT J1 SP DSP 0 D S P 1 D S P 2 DSP 3 UP DN DSP STH DSP STL GND TX LED MIC G 5 3 0 1 5 3 0 2 P T T S303 MIC HANG UP CALL LED AUX 2 AUX 1 SWCIN SW 0UT VOL IN VOL 0UT VOL GND1 s a BUSY LED SP SP SP G SP G GND SP G COMPONENT SIDE VlEW NOTE PLATING SHOWN IS ON OTHER SlDE SOLDER SIDE VlEW NOTE COMPONENTS SHOWN ARE ON THE OTHER SlDE Fold Out ...

Page 91: ...I J l 1 1 I I W 1 0 1 01 mcn1 I l l I I l l I I I l O l l 4l I I I I I C I I I 0 1 c n c n l I I I I I l l I I l l I V I l I I I I I C n I l l 1 0 0 1 I l l I I l l I I dl H I Z I I Z I 01 I I I I I I I I I I I I I I I I I I I I I I I I I 1 0 i2 N Cn C 3 C U I C O C 3 w S m r W o 0 h 0 z 3 a 1 2 1 C L D 3 rt C P rt ID I I I I I I I I I I I I I I L n C n l I l l I I 1 0 W W 5 2 N cn C 3 C C n a C 3...

Page 92: ...SK117BL 2SC458C 2SC458C 2SK192A B L Q752 1 2SC458C HI CHNL I 0 1 1 4 5 1 0 0 I RX VCO Band Switch COLL DRAIN 8 0 3 2 5 0 8 0 7 3 8 0 7 3 2 9 8 0 8 0 7 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 T X T X T X T X T X T X B O T H B O T H B O T H B O T H B O T H B O T H ANALOG IC s TX RX Control Regulator Switch RX 8 V Off Clamp IC901 Reset Gate L O CHNL SYMBOL TYPE 0 8 0 1 0 0 12 9 1 3 1 3 2 9 0 7 3 3 0 6 5 0 ...

Page 93: ...er channels s e l e c t e d LO SCAN push button s t a t u s LO pushbutton is i n PRI push button s t a t u s LO push button i s i n Strobe f o r ONE S d i g i t of CHANNEL d i s p l a y d a t a Strobe f o r TEN S d i g i t of CHANNEL d i s p l a y d a t a A band B band jumper s t a t u s TX RX Mode c o n t r o l TX LO CPU Reset HI Reset Clock o s c i l l a t o r 800 KHz 5 Clock o s c i l l a t o r...

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Page 95: ......

Page 96: ...SOLDER SIDE PATTERN AS SEEN THROUGH PC BOARD TOP BLACK 0 COMPONENT SIDE COMPNENTS LEGEND RED 0 SOLDER SIDE PATTERN AS SEEN THROUGH PC BOARD TOP BLACK 0 SOLDER SIDE COMPONENTS AS SEEN THROUGH PC BOARD TOP NOTE SOLDER SIDE COMPONENTS APPEAR REVERSED WHEN VIEWED FROM TOP SIDE OF BOARD Fold Out ...

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Page 98: ......

Page 99: ...3 70 038004 70 183004 70 1 18007 70 075014 70 080025 70 080026 70 135002 70 132005 70 157015 70 141010 70 141016 70 141037 70 034074 70 034075 70 159015 70 01301 7 70 157016 70 151076 70 151078 70 151077 70 1 18008 70 151079 70 020024 70 151369 70 2 195 HANG UP BOX DETAIL 7 0 3 4 2 4 4 2 ITEM NO 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 DESCRIPTION Top Cover Bottom Cover S l i d e Switch Han...

Page 100: ... EXPLODED MECHANICAL VIEW TRUNK MOUNT Fold Out ...

Page 101: ...2 1 3 14 TM T M T M T M T M T M T M T M T M TM T M T M T M 105 106 107 108 109 110 1 1 1 T M UD Screw Top BndHd 70 151359 REF NO Mtng Brkt Assy Side R a i l Holder Vol Cont Brkt Speaker Brkt Mtng P l a t e S l i d e Nut Mtng Brkt Faceplate Scan Panel Front Earth Spring Lug PA Screw Bind Hd Screw Bind Hd Screw Bind Hd T M Grip P l a t e Grip Chassis Control Side R a i l Rubber Spacer Cover Cntrl Hd...

Page 102: ... 08 PCB Assy CX 05 PCB Assy CX 07 PCB Assy CX 06 PCB Assy CX 04 PCB Assy CX 03 PCB Assy SWITCHES Mod Scn Pri Chnl Select Chnl Select SPEAKER Speaker 70 075033 70 075209 70 075210 70 075211 70 075031 70 075031 70 159108 70 159090 70 159100 70 159108 70 159107 70 159112 70 164030 70 164027 70 164031 70 164026 JACKS CONNECTORS Shld VCO RX Rear70 089084 70 080083 70 080095 70 080082 70 080087 70 08011...

Page 103: ...4 7UF 16V 70 135060 70 135055 70 135057 70 135083 70 135058 70 135095 70 135052 70 135081 70 135063 70 135053 70 135059 70 135010 70 130200 70 138087 70 138133 70 138101 COILS AND TRANSFORMERS Trnsfrmr 42L051 Inductor 70 090105 70 178047 70 178045 L106 108 701 703 CERAMIC DISC CAPACITOR Coi1 FL 4HY2 2UH 470 PF SLY 50V DIODES ISV134 ISV50 1S2075K ND87C1 3R 1SS103 HZ5C1 HZ9A TRIMMER CAPACITORS lOPF ...

Page 104: ... CH 50V 33PF CH 50V 18PF CH 50V 15PF CH 50V 68PF CH 50V 2200PF W5R 50V 220PF CH 50V 1 000PFY 50V 6PF CH 50V 33PF CH 50V 27PF CH 50V 470PF CH 50V 330PF CH 50V 4700PFyW5R 50V P368 CM101 P901 P902 1 TP101 701 751 752 Oven 701 GO1 13 P i n J a c k 7 P i n J a c k 6 P i n J a c k J a c k Coax 70 131205 70 131173 70 131172 70 131176 70 131174 70 131181 70 131179 70 131186 70 131185 70 131194 70 131192 7...

Page 105: ...69 190 726 760 763 950 952 953 955 R126 R128 714 715 729 730 R129 138 162 164 174 708 752 754 R137 156 175 719 741 745 R141 144 146 403 404 718 721 R142 722 907 912 925 926 929 R145 157 732 R152 736 R153 155 R154 R159 709 710 725 4700PF W5R 50V lPF CK 50V 5PF CK 50V 3PF C J 50V 2PF CK 50V 22PF CH 50V 18PF CH 50V 47PF CH 50V 22PF CH 50V 22PF CH 50V 18PF CH 50V 5PF CH 50V 6800PF W5RY 50V 100PF CH 50...

Page 106: ...1S2075K U05C 70 144013 70 144034 70 144029 70 144009 70 144026 70 144038 70 144065 70 144020 70 144011 70 144042 70 144034 70 144033 70 144075 70 144084 70 144007 RX 155 TOPSIDE COMPONENTS ICOILS d T M S F O M R S 70 159097 70 159089 70 159096 70 076138 70 076168 70 080089 70 080134 70 080079 70 080082 70 080082 70 080088 70 085077 70 085078 70 085043 70 085001 70 085048 RECEIVER PCB L201 202 204 ...

Page 107: ...17 CERAMIC CHIP CAPACITORS PART NO 70 135094 70 138035 70 138102 70 138213 70 131202 USE DESCRIPTION TANTALUM CAPACITORS 47UF 35V 2 2UF7 16V 22UF 35V 2 2UF7 16V lUF 35V REF NO R298 299 R214 273 R215 241 243 245 250 USE DESCRIPTION PART NO METAL CHIP RESISTORS CONT 10K ohm 118 W 470 ohm 118 W 0 ohm 70 144029 70 144015 70 144001 ...

Page 108: ...132033 70 132034 70 131183 70 145143 70 145050 70 145009 70 123024 70 144044 70 080054 70 080090 70 080133 70 080198 70 080195 70 085056 70 085043 70 085047 70 085001 TOPSIDE COMPONENTS METAL CHIP RESISTORS REF NO R508 R509 33 ohm 2 2 ohm C530 C545 C546 C540 551 C543 C535 C218 219 220 221 222 229 230 231 232 233 235 293 294 251 253 262 267 275 244 245 246 247 248 249 USE 250 C223 C223 C224 C224 C2...

Page 109: ...5 1 1 C512 C513 551 C514 c514 C515 516 5 1 7 5 1 7 5 1 8 C519 C519 C520 C520 C521 C522 5 2 2 C525 C525 C526 5 2 6 C527 C527 5 2 8 C528 C529 C504 C508 C508 C549 5371 372 5392 GO3 111 Z0 8C5D 2 5T 170 090098 ELECTROLYTIC CAPACITORS MICA CHIP CAPACITORS A B At1 B A B A B A B A B A B A B A B At1 B At1 B TRANSMIT POWER AMPLIFIER PA 1552 BOTTOM SIDE COMPONENTS 220PF lOOV 150PF lOOV 68PF CH 50V 220PF IOO...

Page 110: ...70 145002 70 145001 70 076082 S301 S302 S303 R332 R311 324 CX 04 70 132032 70 131200 70 076089 70 076081 70 159101 70 159102 70 159099 70 070070 C951 C952 957 I C 951 I C 952 J 9 0 1 5902 5903 2273 DISPLAY PCB CX 03 SWITCHES Z 273 CAPACITORS 0 01 UF 50V 47 PF 50V INTEGRATED CIRCUITS uPD 2716D HD 14174 BP CONNECTORS Jack 1 1 P i n Jack 10 P i n Jack 8 Pin PC BOARD PCB UD UD UD UD UD 70 180013 70 16...

Page 111: ...ROLS Squelch Control Volume Control RESISTORS 270 ohm 118 W 22K ohm 118 W CAPACITORS lOuf 50V 70 180012 70 145004 70 145003 70 145007 70 145005 70 145006 70 080082 70 080080 70 085051 70 085052 70 085053 S301 302 303 R311 316 324 R310 325 328 330 R331 R326 R327 4301 4302 D301 D302 303 304 D305 TM TM TM DESCRIPTION TM TM TM TM TM TM TM TM TM TM TM INTEGRATED CIRCUITS PART NO RESISTORS 470 ohm 118 W...

Page 112: ...SCELLANEOUS LED H o l d e r CONTROL CABLE INTERFACE PCB CX 08 CS 08C CA357 USE 70 145052 R 3 5 1 DESCRIPTION PART NO TM TM RESISTORS 4 7 ohm 112 W CONTROL CABLE INTERFACE PCB PC BOARD PCB CABLE ASSEMBLY C a b l e W l J 3 2 3 TM TM TM 7 0 0 7 0 0 8 9 7 0 0 3 4 0 6 9 CX 08 CONT CAPACITORS 220UF 25V TRANSFORMER 8392159 CONNECTORS Jack 34 Pin 7 0 1 3 1 2 2 4 7 0 0 9 0 1 4 4 70 159106 ...

Page 113: ...e q u i p m e n t i n w h i c h t h e p a r t i s u s e d w i t h C P a r t d e s c r i p t i o n a n d D S c h e m a t i c r e f e r e n c e d e s i g n a t o r a n d E I f n e c e s s a r y r e t u r n t h e o l d p a r t a s s a m p l e 2 S p e c i f y q u a n t i t y d e s i r e d o f e a c h p a r t 3 S h i p t o a d d r e s s a n d b i l l i n g a d d r e s s i f d i f f e r e n t Mail o r p...

Page 114: ......

Page 115: ...OPTIONS ...

Page 116: ......

Page 117: ...LEX 43 4041 CABLE MICO SERVICE MANUAL CORRECTION MODEL NO s 7 0 3 4 2 4 4 2 A B L MANUAL CORRECTION NO MC 126 SERIAL NO s a l l DATE 1 1 1 1 8 6 SERVICE MANUAL NO 7 0 3 4 2 4 4 2 SUBJECT Parts L i s t correction SERVICE MANUAL PRINT DATE 8 8 6 REF NO DESCRIPTION OLD PART NO I C 4 0 3 NJM2930L 50 7 0 0 7 6 2 1 0 NEW PART NO ...

Page 118: ......

Page 119: ...t Number 70 157046 over each end of the cable 3 Group the wires i n t o t h e 5 color groups brown green white v i o l e t and yellow 4 Place t h e small connector h a l f i n the wiring f i x t u r e Following the color code below position the wires across the connector and i n t o the wire f i x t u r e Note t h a t the separate columns must apply f o r opposite cable ends so t h a t pin 1 conne...

Page 120: ...Position the mating connector h a l f i n place and press together Cut the loose ends off f l u s h with t h e connector Fold the wire over the top of the connector and snap the s t r a i n r e l i e f i n place Position the heat shrinkable tubing t o cover a s much of the un shielded wires as possible and shrink i n t o place Recommend using Ungar Model I6966 heat gun ...

Page 121: ...43 4045 CABLE MICO SERVICE MANUAL REVISION MODEL N O s 7 0 342B XL REVISION NO CN 2 4 1 SERIAL NO s 2 2 9 1 3 1 and up DATE 5 6 86 SERVICE MANUAL NO 70 136175 SUBJECT CIRCUIT CHANGES SERVICE MANUAL PRINTING DATE 2 8 6 REF NO DESCRIPTION FROM TO PART NO LOCATION C 5 4 7 luf M y l a r C a p A d d e d 7 0 137039 P a r a l l e l W C536 ...

Page 122: ......

Page 123: ... NO CN 278 SERIAL NO s 2 3 5 6 8 1 and up DATE 9 2 8 6 SERVICE MANUAL NO 7 0 3 4 2 4 4 2 SUBJECT CIRCUIT CHANGES SERVICE MANUAL PRINTING DATE 8 8 6 REF NO DESCRIPTION FROM D26 1 1 S 2 0 7 5 K D i o d e De let e R 2 8 4 1K C h i p R e s i s t o r D e l e t e C 2 4 2 2 2 u f E l e c t Cap D e l e t e PART NO LOCATION 7 0 0 8 5 0 0 1 TX TM L i n e 7 0 1 4 4 0 1 9 TX TM L i n e 7 0 1 3 5 0 6 0 TX TM L...

Page 124: ......

Page 125: ...MlCO SERVICE MANUAL REVISION MODEL NO s 7 0 3 4 2 4 4 2 X L REVISION NO CN 280 S E R I A L N O s 2 4 1 1 2 1 and up DATE SERVICE MANUAL NO 7 0 3 4 2 4 4 2 9 2 8 6 SUBJECT CIRCUIT CHANGES SERVICE MANUAL P R I N T I N G DATE 8 8 6 REF NO DESCRIPTION FROM TO PART NO LOCATION D 4 0 8 1 S 2 0 7 5 K Diode added 7 0 0 8 5 0 0 1 P i n s 1 2 I C 4 0 3 ...

Page 126: ......

Page 127: ...L REV1SION MODEL NO s 70 342AXL REVISION NO CN 281 SERIAL NO s 2 5 5 9 8 1 and up DATE 1 0 1 8 6 SERVICE MANUAL NO 7 0 3 4 2 4 4 2 SUBJECT C i r c u i t C h a n g e s SERVICE MANUAL PRINTING DATE 10 86 REF DESCRIPTION FROM TO PART NO LOCATION C 5 3 1 C h i p C a p 2 2 P f 7 0 1 3 1 1 8 8 D 5 0 2 t o gnd C 5 3 1 C h i p C a p 1 8 P f 7 0 1 3 1 1 8 6 D502 t o g n d ...

Page 128: ......

Page 129: ...GRAMMED ACCORDINGLY THE BAND CODE 2D MUST BE USED AND THE CENTER FREQUENCY MUST BE PRO GRAMMED AS DETAILED IN THE 70 1000 OPERATORS MANUAL BEFORE ATTEMPTING ANY ALIGNMENT PLEASE NOTE THE 70 342AXL 342BXL 442AXL 442BXL MODELS ARE WIDEBAND 24 MHz TRANS MIT AND RECEIVE UNITS AND DO NOT REQUIRE ANY ALIGNMENT WHATSOEVER TO COVER THEIR FULL RANGE 136 162 MHz A BAND 148 174 MHz B BAND ...

Page 130: ... e d s i g n a l a n d a d j u s t CV701 f o r t h e c o r r e c t f r e q u e n c y RF POWER ADJUSTMENT 2 A d j u s t CV502 a n d CV 5 0 3 f o r maximum RF power o u t p u t A d j u s t RV 502 f o r 4 0 w a t t s RF o u t p u t 3 I f t h e CTCSS o r o t h e r e n c o d e r o p t i o n s a r e f i e l d i n s t a l l e d t r a n s m i t t e r m o d u l a t i o n s h o u l d be a d j u s t e d a s ...

Page 131: ...RECEIVER ALIGNMENT POINTS 7 0 3 4 2 4 4 2 PA BOARD ALIGNMENT POINTS ...

Page 132: ...TRANSMITTER ALIGNMENT POINTS 70 342 442 XL 0 TPlOl ...

Page 133: ...Install the E PROM module in the radio and re align the Main and Transmit VCOs as follows a Select channel 1 and while transmiting adjust L702 for 5 5 VDC at TP701 b While transmitting on channel 1 adjust L107 for 5 5 VDC at TP101 c Select channel 2 and while receiving adjust L704 for 4 0 VDC at TP701 d Select channel 3 and in the receive mode confirm TP701 reads 1 0 VDC or greater If not recheck ...

Page 134: ... programmed f o r a t r a n s m i t f r e q u e n c y a t t h e c e n t e r o f t h e u n i t s o p e r a t i o n a l r a n g e M o n i t o r t h e t r a n s m i t V C O s i g n a l a t IC104 p i n 11 w i t h a n RF v o l t m e t e r o r h i g h f r e q u e n c y o s c i l l o s c o p e A d j u s t L l l O a n d L l l l f o r maximum s i g n a l l e v e l w h i l e i n t h e t r a n s m i t mode M...

Page 135: ...I DSP D5P 6 DSP OSP DSP OSP ...

Page 136: ...a E l 7 s a C 202 L IC302 C DISR Y 2 3611th 14S118P RX VCO LEO ORIVC r I I L ICSS2 7 5 3 0 4 c I IC901 2 5m j IC703 It704 0710 H044840 14174 1 3 CH SW pP9S7lC OH2502 zsc1906 A27 BP BUFF a m n a PRE SGILER BUFF UTCH EP ROY scnNI IpRrl Ir o l I ICM6 14069UBP P T T s w I RX VCO l VCO I Fold Out _ 1 1 _ _ 1 ...

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