Kenwood FZDA07ELEF2 Service Manual page 8

FZDA07ELEF2/EREF2/MRHF2
Ref. No.
IC64 IE-BUS interface driver/receiver
IC65 Reset logic IC
Level shift logic IC
IC66
For hardware mute
IC67 Flash writing SW
Transistor for controlling the external radio ANT power
Q1
supply
Q2 Transistor for driving the external radio ANT power supply Output P-ANT power supply
Q3 Transistor for driving the external radio ANT power supply ON when Q1 is ON
Transistor for external radio ANT power supply
Q4
shortage protection circuit
Q5 Bu8V power supply transistor
Q6 Bu8V power supply transistor
Q7 Bu5V power supply transistor
Q8 Bu5V power supply transistor
Transistor for external radio ANT power supply
Q9,10
shortage protection circuit
Q11 Transistor to control the system board power supply SW ON when the system µ-com P_ON output is H
Q12 System board power supply SW
Q13 Bu8V power supply transistor
Q14 Bu5V power supply transistor
Q16 Transistor for detecting abnormal voltage
Q17 Transistor for detecting abnormal voltage
Q50 Mid-point circuit power supply SW
Transistor for external radio ANT power supply
Q51,52
shortage protection circuit
Q53 Digital transistor for BU5V switch
Q54 Transistor for BU3.3V switch
Q55 Digital transistor for BU5V switch control
Q56 Digital transistor for BU3.3V switch control
Q57 Transistor for BU detection
Q58 Digital transistor for over voltage detection
Q59 ACC detection transistor
Q60 Control 1/2 Vcc and distributor power supply circuits
Q100 FET for FM diversity IC input S meter switch
Q101 Digital transistor for AM power supply switch
Q102 Digital transistor for IF counter detection
Digital transistor for FM diversity IC power supply
Q104
switch control
Q106 Digital transistor for AM power supply switch control
Q108 Digital transistor for FM diversity IC power supply switch OFF when AM
8
COMPONENTS DESCRIPTION
Application / Function Operation / Condition / Compatibility
Sie-BUS communication interface
OR logic of power reduction, system µ-com reset request and fl ash writer
reset request
Level-shifting (3.3V → 5V)
OR logic of reset and momentary power down detection
Transfer the data from the writer when the µ-com FLMD0_CNT is L
ON when ACC_ON
ON when Q9 and Q51 are turned on and when P-ANT output is shorted
Input: +B, Output BU8V power supply
On when +B is on
Input: +B, Output BU5V power supply
On when +B is on
Turn ON to activate the protection circuit when system µ-com TUN_ANTC
output is H
P_ON: ON when Q11 is ON while the output is H
Input: +B, Output BU8V power supply
Input: +B, Output BU5V power supply
Protection for the abnormal condition when the output from IC5 is exceeding 10V
Protection for the abnormal condition when the output from IC4 is exceeding 10V
ON when A_PON
Is turned On and activates the protection circuit when the system µ-com
P_ON
ON when µ-com A_PON
ON when µ-com A_PON
ON when µ-com A_PON
ON when µ-com A_PON
Output L when the BU voltage is 9.8V or more
Detect the over voltage when the BU voltage is 19.6V or more
Output L when the ACC voltage is 9.8V or more
Detect APON5V and turn ON 1/2 Vcc circuit and distributor
OFF when AM
ON when AM
L: When station is found, H: When station is not found
ON when AM
ON when AM