Midland Radio SP-300 service manual Voltage Charts, Main Circuit

MAXON

SP-300 HAND HELD

			VOLTAGE CHARTS
CONTROL CIRCUIT
		RX			TX
REF #	B	C	E	B	C	E
Q401	4.4	0.0	5.0	0.3	5.0	5.0
Q403	0.0	4.6	GND	0.0	4.6	GND
Q404	5.0	2.2	2.0	0.0	7.0	0.0
Q405	5.0	1.8	1.7	5.0	1.8	1.7
Q406	4.0	0.0	5.0	2.0	5.0	5.0
Q407	0.0	4.5	GND	5.0	0.0	GND
Q408	0.0	5.0	GND	2.0	0.0	GND
Q410	4.3	0.0	5.0	4.3	0.0	5.0
Q411	0.0	-	GND	0.0	0.0	GND
Q412	0.0	7.5	7.5	0.0	7.5	7.5
Q413	7.5	0.0	GND	7.5	0.0	GND

zNOTE: Q402 and Q409 are not fitted on this model series.

MAIN CIRCUIT

RXTX

REF #	B	C	E	B	C	E
Q1	0.6	5.0	5.0	0.6	5.0	5.0
Q2	5.0	0.0	5.0	0.3	4.7	5.0
Q3	0.0	4.7	5.0	5.0	0.0	5.0
Q4	0.0	5.0	5.0	0.0	5.0	5.0
Q5	4.7	0.0	5.0	4.7	0.0	5.0
Q6	4.0	18.0	5.0	4.0	18.0	5.0
Q7	18.0	~3.0	18.0	18.0	~4.0	18.0
Q8	5.0	0.0	5.0	5.0	0.0	5.0
Q11	0.0	3.0	0.0	0.0	4.0	0.0
Q12	1.6	4.5	1.0	0.0	0.0	0.0
Q13	4.6	4.6	4.0	0.0	0.0	0.0
Q14	0.0	0.0	0.0	4.6	4.6	4.0
Q16	0.0	0.0	0.0	1.4	4.8	0.8
Q17	0.0	0.0	0.0	0.6	3.0	GND
Q18	0.0	0.0	0.0	5.0	0.2	GND
Q21	0.0	0.0	0.0	~3.0	~5.6	~2.4
Q22	7.5	0.0	7.5	6.9	~7.0	7.5
Q24	0.0	4.5	GND	0.0	0.0	GND
Q25	0.7	4.0	GND	0.0	0.0	GND
Q26	-	-	-	0.0	0.0	0.0
Q27	0.7	NOISE	GND	0.0	0.0	GND
Q33	7.2	4.0	7.5	6.9	7.5	7.5
Q34	0.0	6.6	GND	2.0	0.0	GND

zNOTE: Q9, 10, 15, 19, 20, 23 and 28 - 32 are not fitted on this model series.

zNOTE: ~ indicates approximate voltage. Actual voltage may vary.

Page -26-

May 2001