Frymaster H17SC Interface Board Diagnostic Chart, Diagnostic LED Legend, Meter Setting, Test

7.9Interface Board Diagnostic Chart

The following diagram and charts provide ten quick system checks that can be performed using only a multimeter.

Diagostic LEDs

			3	2	1
			6	5	4
			9	8	7
			12	11	10
			15	14	13
K1			K2	K3		K4
Left			Left		Right		Right
Latch			Heat		Heat		Latch
Relay			Relay		Relay	Relay
10	7	4	1		10	7	4	1
11	8	5	2		11	8	5	2
12	9	6	3		12	9	6	3

	Diagnostic LED Legend
CMP	indicates power from 12V transformer
24	indicates power from 24V transformer
HI	(RH) indicates output (closed) from right latch
	relay
HI	(LH) indicates output (closed) from left latch
	relay
HT	(RH) indicates output from right heat relay
HT	(LH) indicates output from left heat relay
AL	(RH) indicates output (open) from right latch
	relay
AL	(LH) indicates output (open) from left latch
	relay

Test Points
J1 Left	J2 Right
Meter Setting		Test	Pin	Pin	Results
12 VAC Power		50 VAC Scale	1 of J2	3 of J2	12-16 VAC
24 VAC Power		50 VAC Scale	2 of J2	Chassis	24-30 VAC
*Probe Resistance (RH)		R X 1000 OHMS	11 of J2	12 of J2	See Chart
*Probe Resistance (LH)		R X 1000 OHMS	3 of J1	2 of J1	See Chart
Hi-Limit Continuity (RH)		R X 1 OHMS	7 of J2	4 of J2	0 - OHMS
Hi-Limit Continuity (LH)		R X 1 OHMS	4 of J1	7 of J1	0 - OHMS
Latch Contactor Coil (RH)		R X 1 OHMS	8 of J2	Chassis	3-10 OHMS
Latch Contactor Coil (LH)		R X 1 OHMS	5 of J1	Chassis	3-10 OHMS
Heat Contactor Coil (RH)		R X 1 OHMS	9 of J2	Chassis	18-25 OHMS
Heat Contactor Coil (LH)		R X 1 OHMS	6 of J1	Chassis	18-25 OHMS

* Disconnect 15-Pin harness from the computer/controller before testing the probe circuit.

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