TKR-750 service manual

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TKR-750 INSTALLATION 3. External Speaker (KES-4) The TKR-750 has a internal built-in speaker (5W/8Ω), and the external speaker output from the TEST/SPKR connector (15-pin) on the rear of the radio is 4W/4Ω. Use external speaker KES-4. 3-1. Connection for the KES-4 With the TKR-750 ■ When taking the AF output from the TEST/ SPKR connector (15-pin) on the rear of the radio The following tools are required for changing the connector. Fig. 4-1 • Extracting tool The following extracting tool is recommended : Molex Inc. Order No. : 11-03-0002 1. Remove the connector with jumper from the external speaker connector on the rear panel of the radio. (Fig. 4- 1) Note : Save the jumper, which is required when the radio is used without the external speaker. 2. Remove the terminals with the jumper from the connector housing holes number 9 and 12 using the extracting tool. Removing the jumper lead (Fig. 4-2) 1) Insert the extracting tool (11-03-0002) into the connector while pushing the jumper lead in the direction of (a). 2) Push the extracting tool into collapse the barbs of the crimp terminal. 3) Pull out the lead while continuing to push the extracting tool in the direction (b). 3. Reinsert the terminal with the black and white stripe lead into hole number 12, and the terminal with the black lead into hole number 6. (Fig. 4-3) 4. Attach the connector to the external speaker connector on the radio. Note : Relationship between TEST/SPKR connector (15-pin) connection and speaker output. When pins 9 and 12 are shorted : Built-in internal speaker is used. When pins 9 and 12 are open and output is from pins 6 and 12 : KES-4 is used. Fig. 4-2 Fig. 4-3 14
MODIFICATION TKR-750 1. Modification for Sinking the Collector Current Up Auxiliary output 1 and 2 can each be modified to sink up 600mA of the collector current. The following modification should be installed when Auxiliary output 1 or 2 is used to control external equipment. 1. Remove D625, R755, and R769 for Auxiliary output 1 (D624, R756, and R770 for Auxiliary output 2) on the component side of the control section for TX-RX unit PCB. 2. Install $Q608, $Q612, and $R761 for Auxiliary output 1 ($Q607, $Q611, and $R759 for Auxiliary output 2) on the component side of the control section for TX-RX unit PCB. $Q607, $Q608, $Q611, $Q612 : DTD114EKA $R759, $R761 : 3.9kΩ (RK73GB1J392J) chip resistor. 3. Change R801 for Auxiliary output 1 (R797 for Auxiliary output 2) from 1kΩ (RK73GB1J102J) to 0Ω (R92-1252- 05). 2. DC Source Switch To prevent the power supply from turning off due to misoperation of the DC source switch on the front panel or accidents (tampering) after installation, the main unit can be kept on regardless of the on/off of the DC source switch on the front panel. Short the PSW land near K1 relay by soldering. TX-RX unit (A/2) Component side By making this modification, Auxiliary output 1 and 2 can now sink up to 600mA each. CF1 WIDE CF2 NARROW TX-RX unit (B/2) Component side PSW K1 IC602 IC623 R756 $Q607 R770 $Q611 CN605 Fig. 3 $R759 $R769 R755 R769 $Q608 $Q612 C681 Fig. 1 5V 5V Add $R761 ($R759) 3.9kΩ Remove D625 (D624) DA204U Shift register IC623 Add $Q608 ($Q607) DTD114EKA Remove R755 (R756) 0Ω Add $Q612 ($Q611) DTD114EKA Remove R769 (R770) 0Ω TEST/ SPKR Fig. 2 15
Page 1 and 2: VHF FM REPEATER TKR-750 SERVICE MAN
Page 3 and 4: OPERATING FEATURES TKR-750 1. Contr
Page 5 and 6: OPERATING FEATURES TKR-750 3. Progr
Page 7 and 8: OPERATING FEATURES TKR-750 4. Trigg
Page 9 and 10: OPERATING FEATURES TKR-750 Current
Page 11 and 12: OPERATING FEATURES / REALIGNMENT TK
Page 13: INSTALLATION TKR-750 1. External Po
Page 17 and 18: CIRCUIT DESCRIPTION TKR-750 1. Outl
Page 19 and 20: CIRCUIT DESCRIPTION TKR-750 3-3. Dr
Page 21 and 22: CIRCUIT DESCRIPTION TKR-750 5. Cont
Page 23 and 24: SEMICONDUCTOR DATA TKR-750 Main CPU
Page 25 and 26: TKR-750 SEMICONDUCTOR DATA / DESCRI
Page 27 and 28: New Parts. indicates safety critica
Page 29 and 30: PARTS LIST D2 02DZ5.1(Y) ZENER DIOD
Page 31 and 32: PARTS LIST TKR-750 C639 CK73GB1E103
Page 33 and 34: PARTS LIST TKR-750 R83 R92-1252-05
Page 35 and 36: PARTS LIST Q1,2 2SC3357 TRANSISTOR
Page 37 and 38: A TKR-750 EXPLODED VIEW TKR-750 B C
Page 39 and 40: TKR-750 ADJUSTMENT Test Equipment R
Page 41 and 42: TKR-750 ADJUSTMENT Item Condition M
Page 43 and 44: TKR-750 ADJUSTMENT Item Condition M
Page 45 and 46: TKR-750 ADJUSTMENT ATTEN 20dB RL 10
Page 47 and 48: TKR-750 TERMINAL FUNCTION Connector
Page 49 and 50: TKR-750 TERMINAL FUNCTION Connector
Page 51 and 52: J H F D B I G E C A 1 3 5 7 2 4 6 5
Page 53 and 54: I A B C D E F G H I PC BOARD VIEWS
Page 55 and 56: A B C D E F G H I J K L M N O P PC
Page 57 and 58: I G O A B C D E F G H I J K L M N O
Page 59 and 60: S R Q P O N M L K J I H G F E D C B
Page 61 and 62: A B C D E F G H I J K L M N O P Q P
Page 63 and 64: A B C Note : Components marked with
Page 65 and 66:
A B C Note : Components marked with
Page 67 and 68:
TKR-750 KES-4 (EXTERNAL SPEAKER) Wh
Page 69:
TKR-750 SPECIFICATIONS (E TYPE) GEN
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